/*
* Note: While Microsoft is not the author of this file, Microsoft is
* offering you a license subject to the terms of the Microsoft Software
* License Terms for Microsoft ASP.NET Model View Controller 4 Developer Preview.
* Microsoft reserves all other rights. The notices below are provided
* for informational purposes only and are not the license terms under
* which Microsoft distributed this file.
*/
// Knockout JavaScript library v1.3.0beta
// (c) Steven Sanderson - http://knockoutjs.com/
(function(window,undefined){
var ko = window["ko"] = {};
// Google Closure Compiler helpers (used only to make the minified file smaller)
ko.exportSymbol = function(publicPath, object) {
var tokens = publicPath.split(".");
var target = window;
for (var i = 0; i < tokens.length - 1; i++)
target = target[tokens[i]];
target[tokens[tokens.length - 1]] = object;
};
ko.exportProperty = function(owner, publicName, object) {
owner[publicName] = object;
};
ko.utils = new (function () {
var stringTrimRegex = /^(\s|\u00A0)+|(\s|\u00A0)+$/g;
var isIe6 = /MSIE 6/i.test(navigator.userAgent);
var isIe7 = /MSIE 7/i.test(navigator.userAgent);
var knownMouseEvents = { "click" : 1, "dblclick" : 1, "mousedown" : 1, "mouseup" : 1, "mousemove" : 1, "mouseover" : 1, "mouseout" : 1, "mouseenter" : 1, "mouseleave" : 1 };
function isClickOnCheckableElement(element, eventType) {
if ((element.tagName != "INPUT") || !element.type) return false;
if (eventType.toLowerCase() != "click") return false;
var inputType = element.type.toLowerCase();
return (inputType == "checkbox") || (inputType == "radio");
}
return {
fieldsIncludedWithJsonPost: ['authenticity_token', /^__RequestVerificationToken(_.*)?$/],
arrayForEach: function (array, action) {
for (var i = 0, j = array.length; i < j; i++)
action(array[i]);
},
arrayIndexOf: function (array, item) {
if (typeof array.indexOf == "function")
return array.indexOf(item);
for (var i = 0, j = array.length; i < j; i++)
if (array[i] === item)
return i;
return -1;
},
arrayFirst: function (array, predicate, predicateOwner) {
for (var i = 0, j = array.length; i < j; i++)
if (predicate.call(predicateOwner, array[i]))
return array[i];
return null;
},
arrayRemoveItem: function (array, itemToRemove) {
var index = ko.utils.arrayIndexOf(array, itemToRemove);
if (index >= 0)
array.splice(index, 1);
},
arrayMap: function (array, mapping) {
array = array || [];
var result = [];
for (var i = 0, j = array.length; i < j; i++)
result.push(mapping(array[i]));
return result;
},
arrayFilter: function (array, predicate) {
array = array || [];
var result = [];
for (var i = 0, j = array.length; i < j; i++)
if (predicate(array[i]))
result.push(array[i]);
return result;
},
arrayPushAll: function (array, valuesToPush) {
for (var i = 0, j = valuesToPush.length; i < j; i++)
array.push(valuesToPush[i]);
return array;
},
extend: function (target, source) {
for(var prop in source) {
if(source.hasOwnProperty(prop)) {
target[prop] = source[prop];
}
}
return target;
},
emptyDomNode: function (domNode) {
while (domNode.firstChild) {
ko.removeNode(domNode.firstChild);
}
},
setDomNodeChildren: function (domNode, childNodes) {
ko.utils.emptyDomNode(domNode);
if (childNodes) {
ko.utils.arrayForEach(childNodes, function (childNode) {
domNode.appendChild(childNode);
});
}
},
replaceDomNodes: function (nodeToReplaceOrNodeArray, newNodesArray) {
var nodesToReplaceArray = nodeToReplaceOrNodeArray.nodeType ? [nodeToReplaceOrNodeArray] : nodeToReplaceOrNodeArray;
if (nodesToReplaceArray.length > 0) {
var insertionPoint = nodesToReplaceArray[0];
var parent = insertionPoint.parentNode;
for (var i = 0, j = newNodesArray.length; i < j; i++)
parent.insertBefore(newNodesArray[i], insertionPoint);
for (var i = 0, j = nodesToReplaceArray.length; i < j; i++) {
ko.removeNode(nodesToReplaceArray[i]);
}
}
},
setOptionNodeSelectionState: function (optionNode, isSelected) {
// IE6 sometimes throws "unknown error" if you try to write to .selected directly, whereas Firefox struggles with setAttribute. Pick one based on browser.
if (navigator.userAgent.indexOf("MSIE 6") >= 0)
optionNode.setAttribute("selected", isSelected);
else
optionNode.selected = isSelected;
},
stringTrim: function (string) {
return (string || "").replace(stringTrimRegex, "");
},
stringTokenize: function (string, delimiter) {
var result = [];
var tokens = (string || "").split(delimiter);
for (var i = 0, j = tokens.length; i < j; i++) {
var trimmed = ko.utils.stringTrim(tokens[i]);
if (trimmed !== "")
result.push(trimmed);
}
return result;
},
stringStartsWith: function (string, startsWith) {
string = string || "";
if (startsWith.length > string.length)
return false;
return string.substring(0, startsWith.length) === startsWith;
},
evalWithinScope: function (expression /*, scope1, scope2, scope3... */) {
// Build the source for a function that evaluates "expression"
// For each scope variable, add an extra level of "with" nesting
// Example result: with(sc[1]) { with(sc[0]) { return (expression) } }
var scopes = Array.prototype.slice.call(arguments, 1);
var functionBody = "return (" + expression + ")";
for (var i = 0; i < scopes.length; i++) {
if (scopes[i] && typeof scopes[i] == "object")
functionBody = "with(sc[" + i + "]) { " + functionBody + " } ";
}
return (new Function("sc", functionBody))(scopes);
},
domNodeIsContainedBy: function (node, containedByNode) {
if (containedByNode.compareDocumentPosition)
return (containedByNode.compareDocumentPosition(node) & 16) == 16;
while (node != null) {
if (node == containedByNode)
return true;
node = node.parentNode;
}
return false;
},
domNodeIsAttachedToDocument: function (node) {
return ko.utils.domNodeIsContainedBy(node, document);
},
registerEventHandler: function (element, eventType, handler) {
if (typeof jQuery != "undefined") {
if (isClickOnCheckableElement(element, eventType)) {
// For click events on checkboxes, jQuery interferes with the event handling in an awkward way:
// it toggles the element checked state *after* the click event handlers run, whereas native
// click events toggle the checked state *before* the event handler.
// Fix this by intecepting the handler and applying the correct checkedness before it runs.
var originalHandler = handler;
handler = function(event, eventData) {
var jQuerySuppliedCheckedState = this.checked;
if (eventData)
this.checked = eventData.checkedStateBeforeEvent !== true;
originalHandler.call(this, event);
this.checked = jQuerySuppliedCheckedState; // Restore the state jQuery applied
};
}
jQuery(element)['bind'](eventType, handler);
} else if (typeof element.addEventListener == "function")
element.addEventListener(eventType, handler, false);
else if (typeof element.attachEvent != "undefined")
element.attachEvent("on" + eventType, function (event) {
handler.call(element, event);
});
else
throw new Error("Browser doesn't support addEventListener or attachEvent");
},
triggerEvent: function (element, eventType) {
if (!(element && element.nodeType))
throw new Error("element must be a DOM node when calling triggerEvent");
if (typeof jQuery != "undefined") {
var eventData = [];
if (isClickOnCheckableElement(element, eventType)) {
// Work around the jQuery "click events on checkboxes" issue described above by storing the original checked state before triggering the handler
eventData.push({ checkedStateBeforeEvent: element.checked });
}
jQuery(element)['trigger'](eventType, eventData);
} else if (typeof document.createEvent == "function") {
if (typeof element.dispatchEvent == "function") {
var eventCategory = (eventType in knownMouseEvents ? "MouseEvents" : "HTMLEvents");
var event = document.createEvent(eventCategory);
event.initEvent(eventType, true, true, window, 0, 0, 0, 0, 0, false, false, false, false, 0, element);
element.dispatchEvent(event);
}
else
throw new Error("The supplied element doesn't support dispatchEvent");
} else if (typeof element.fireEvent != "undefined") {
// Unlike other browsers, IE doesn't change the checked state of checkboxes/radiobuttons when you trigger their "click" event
// so to make it consistent, we'll do it manually here
if (eventType == "click") {
if ((element.tagName == "INPUT") && ((element.type.toLowerCase() == "checkbox") || (element.type.toLowerCase() == "radio")))
element.checked = element.checked !== true;
}
element.fireEvent("on" + eventType);
}
else
throw new Error("Browser doesn't support triggering events");
},
unwrapObservable: function (value) {
return ko.isObservable(value) ? value() : value;
},
domNodeHasCssClass: function (node, className) {
var currentClassNames = (node.className || "").split(/\s+/);
return ko.utils.arrayIndexOf(currentClassNames, className) >= 0;
},
toggleDomNodeCssClass: function (node, className, shouldHaveClass) {
var hasClass = ko.utils.domNodeHasCssClass(node, className);
if (shouldHaveClass && !hasClass) {
node.className = (node.className || "") + " " + className;
} else if (hasClass && !shouldHaveClass) {
var currentClassNames = (node.className || "").split(/\s+/);
var newClassName = "";
for (var i = 0; i < currentClassNames.length; i++)
if (currentClassNames[i] != className)
newClassName += currentClassNames[i] + " ";
node.className = ko.utils.stringTrim(newClassName);
}
},
outerHTML: function(node) {
// For IE and Chrome
var nativeOuterHtml = node.outerHTML;
if (typeof nativeOuterHtml == "string")
return nativeOuterHtml;
// Other browsers
var dummyContainer = window.document.createElement("div");
dummyContainer.appendChild(node.cloneNode(true));
return dummyContainer.innerHTML;
},
range: function (min, max) {
min = ko.utils.unwrapObservable(min);
max = ko.utils.unwrapObservable(max);
var result = [];
for (var i = min; i <= max; i++)
result.push(i);
return result;
},
makeArray: function(arrayLikeObject) {
var result = [];
for (var i = 0, j = arrayLikeObject.length; i < j; i++) {
result.push(arrayLikeObject[i]);
};
return result;
},
isIe6 : isIe6,
isIe7 : isIe7,
getFormFields: function(form, fieldName) {
var fields = ko.utils.makeArray(form.getElementsByTagName("INPUT")).concat(ko.utils.makeArray(form.getElementsByTagName("TEXTAREA")));
var isMatchingField = (typeof fieldName == 'string')
? function(field) { return field.name === fieldName }
: function(field) { return fieldName.test(field.name) }; // Treat fieldName as regex or object containing predicate
var matches = [];
for (var i = fields.length - 1; i >= 0; i--) {
if (isMatchingField(fields[i]))
matches.push(fields[i]);
};
return matches;
},
parseJson: function (jsonString) {
if (typeof jsonString == "string") {
jsonString = ko.utils.stringTrim(jsonString);
if (jsonString) {
if (window.JSON && window.JSON.parse) // Use native parsing where available
return window.JSON.parse(jsonString);
return (new Function("return " + jsonString))(); // Fallback on less safe parsing for older browsers
}
}
return null;
},
stringifyJson: function (data) {
if ((typeof JSON == "undefined") || (typeof JSON.stringify == "undefined"))
throw new Error("Cannot find JSON.stringify(). Some browsers (e.g., IE < 8) don't support it natively, but you can overcome this by adding a script reference to json2.js, downloadable from http://www.json.org/json2.js");
return JSON.stringify(ko.utils.unwrapObservable(data));
},
postJson: function (urlOrForm, data, options) {
options = options || {};
var params = options['params'] || {};
var includeFields = options['includeFields'] || this.fieldsIncludedWithJsonPost;
var url = urlOrForm;
// If we were given a form, use its 'action' URL and pick out any requested field values
if((typeof urlOrForm == 'object') && (urlOrForm.tagName == "FORM")) {
var originalForm = urlOrForm;
url = originalForm.action;
for (var i = includeFields.length - 1; i >= 0; i--) {
var fields = ko.utils.getFormFields(originalForm, includeFields[i]);
for (var j = fields.length - 1; j >= 0; j--)
params[fields[j].name] = fields[j].value;
}
}
data = ko.utils.unwrapObservable(data);
var form = document.createElement("FORM");
form.style.display = "none";
form.action = url;
form.method = "post";
for (var key in data) {
var input = document.createElement("INPUT");
input.name = key;
input.value = ko.utils.stringifyJson(ko.utils.unwrapObservable(data[key]));
form.appendChild(input);
}
for (var key in params) {
var input = document.createElement("INPUT");
input.name = key;
input.value = params[key];
form.appendChild(input);
}
document.body.appendChild(form);
options['submitter'] ? options['submitter'](form) : form.submit();
setTimeout(function () { form.parentNode.removeChild(form); }, 0);
}
}
})();
ko.exportSymbol('ko.utils', ko.utils);
ko.exportSymbol('ko.utils.arrayForEach', ko.utils.arrayForEach);
ko.exportSymbol('ko.utils.arrayFirst', ko.utils.arrayFirst);
ko.exportSymbol('ko.utils.arrayFilter', ko.utils.arrayFilter);
ko.exportSymbol('ko.utils.arrayGetDistinctValues', ko.utils.arrayGetDistinctValues);
ko.exportSymbol('ko.utils.arrayIndexOf', ko.utils.arrayIndexOf);
ko.exportSymbol('ko.utils.arrayMap', ko.utils.arrayMap);
ko.exportSymbol('ko.utils.arrayPushAll', ko.utils.arrayPushAll);
ko.exportSymbol('ko.utils.arrayRemoveItem', ko.utils.arrayRemoveItem);
ko.exportSymbol('ko.utils.extend', ko.utils.extend);
ko.exportSymbol('ko.utils.fieldsIncludedWithJsonPost', ko.utils.fieldsIncludedWithJsonPost);
ko.exportSymbol('ko.utils.getFormFields', ko.utils.getFormFields);
ko.exportSymbol('ko.utils.postJson', ko.utils.postJson);
ko.exportSymbol('ko.utils.parseJson', ko.utils.parseJson);
ko.exportSymbol('ko.utils.registerEventHandler', ko.utils.registerEventHandler);
ko.exportSymbol('ko.utils.stringifyJson', ko.utils.stringifyJson);
ko.exportSymbol('ko.utils.range', ko.utils.range);
ko.exportSymbol('ko.utils.toggleDomNodeCssClass', ko.utils.toggleDomNodeCssClass);
ko.exportSymbol('ko.utils.triggerEvent', ko.utils.triggerEvent);
ko.exportSymbol('ko.utils.unwrapObservable', ko.utils.unwrapObservable);
if (!Function.prototype['bind']) {
// Function.prototype.bind is a standard part of ECMAScript 5th Edition (December 2009, http://www.ecma-international.org/publications/files/ECMA-ST/ECMA-262.pdf)
// In case the browser doesn't implement it natively, provide a JavaScript implementation. This implementation is based on the one in prototype.js
Function.prototype['bind'] = function (object) {
var originalFunction = this, args = Array.prototype.slice.call(arguments), object = args.shift();
return function () {
return originalFunction.apply(object, args.concat(Array.prototype.slice.call(arguments)));
};
};
}
ko.utils.domData = new (function () {
var uniqueId = 0;
var dataStoreKeyExpandoPropertyName = "__ko__" + (new Date).getTime();
var dataStore = {};
return {
get: function (node, key) {
var allDataForNode = ko.utils.domData.getAll(node, false);
return allDataForNode === undefined ? undefined : allDataForNode[key];
},
set: function (node, key, value) {
if (value === undefined) {
// Make sure we don't actually create a new domData key if we are actually deleting a value
if (ko.utils.domData.getAll(node, false) === undefined)
return;
}
var allDataForNode = ko.utils.domData.getAll(node, true);
allDataForNode[key] = value;
},
getAll: function (node, createIfNotFound) {
var dataStoreKey = node[dataStoreKeyExpandoPropertyName];
var hasExistingDataStore = dataStoreKey && (dataStoreKey !== "null");
if (!hasExistingDataStore) {
if (!createIfNotFound)
return undefined;
dataStoreKey = node[dataStoreKeyExpandoPropertyName] = "ko" + uniqueId++;
dataStore[dataStoreKey] = {};
}
return dataStore[dataStoreKey];
},
clear: function (node) {
var dataStoreKey = node[dataStoreKeyExpandoPropertyName];
if (dataStoreKey) {
delete dataStore[dataStoreKey];
node[dataStoreKeyExpandoPropertyName] = null;
}
}
}
})();
ko.exportSymbol('ko.utils.domData', ko.utils.domData);
ko.exportSymbol('ko.utils.domData.clear', ko.utils.domData.clear); // Exporting only so specs can clear up after themselves fully
ko.utils.domNodeDisposal = new (function () {
var domDataKey = "__ko_domNodeDisposal__" + (new Date).getTime();
function getDisposeCallbacksCollection(node, createIfNotFound) {
var allDisposeCallbacks = ko.utils.domData.get(node, domDataKey);
if ((allDisposeCallbacks === undefined) && createIfNotFound) {
allDisposeCallbacks = [];
ko.utils.domData.set(node, domDataKey, allDisposeCallbacks);
}
return allDisposeCallbacks;
}
function destroyCallbacksCollection(node) {
ko.utils.domData.set(node, domDataKey, undefined);
}
function cleanSingleNode(node) {
// Run all the dispose callbacks
var callbacks = getDisposeCallbacksCollection(node, false);
if (callbacks) {
callbacks = callbacks.slice(0); // Clone, as the array may be modified during iteration (typically, callbacks will remove themselves)
for (var i = 0; i < callbacks.length; i++)
callbacks[i](node);
}
// Also erase the DOM data
ko.utils.domData.clear(node);
// Special support for jQuery here because it's so commonly used.
// Many jQuery plugins (including jquery.tmpl) store data using jQuery's equivalent of domData
// so notify it to tear down any resources associated with the node & descendants here.
if ((typeof jQuery == "function") && (typeof jQuery['cleanData'] == "function"))
jQuery['cleanData']([node]);
}
return {
addDisposeCallback : function(node, callback) {
if (typeof callback != "function")
throw new Error("Callback must be a function");
getDisposeCallbacksCollection(node, true).push(callback);
},
removeDisposeCallback : function(node, callback) {
var callbacksCollection = getDisposeCallbacksCollection(node, false);
if (callbacksCollection) {
ko.utils.arrayRemoveItem(callbacksCollection, callback);
if (callbacksCollection.length == 0)
destroyCallbacksCollection(node);
}
},
cleanNode : function(node) {
if ((node.nodeType != 1) && (node.nodeType != 9))
return;
cleanSingleNode(node);
// Clone the descendants list in case it changes during iteration
var descendants = [];
ko.utils.arrayPushAll(descendants, node.getElementsByTagName("*"));
for (var i = 0, j = descendants.length; i < j; i++)
cleanSingleNode(descendants[i]);
},
removeNode : function(node) {
ko.cleanNode(node);
if (node.parentNode)
node.parentNode.removeChild(node);
}
}
})();
ko.cleanNode = ko.utils.domNodeDisposal.cleanNode; // Shorthand name for convenience
ko.removeNode = ko.utils.domNodeDisposal.removeNode; // Shorthand name for convenience
ko.exportSymbol('ko.cleanNode', ko.cleanNode);
ko.exportSymbol('ko.removeNode', ko.removeNode);
ko.exportSymbol('ko.utils.domNodeDisposal', ko.utils.domNodeDisposal);
ko.exportSymbol('ko.utils.domNodeDisposal.addDisposeCallback', ko.utils.domNodeDisposal.addDisposeCallback);
ko.exportSymbol('ko.utils.domNodeDisposal.removeDisposeCallback', ko.utils.domNodeDisposal.removeDisposeCallback);(function () {
var leadingCommentRegex = /^(\s*)<!--(.*?)-->/;
function simpleHtmlParse(html) {
// Based on jQuery's "clean" function, but only accounting for table-related elements.
// If you have referenced jQuery, this won't be used anyway - KO will use jQuery's "clean" function directly
// Trim any leading whitespace/comment nodes, otherwise IE < 9 will discard them. We'll need to restore them after.
html = html || "";
var prefixNodes = [];
while (html.match(leadingCommentRegex)) {
html = html.replace(leadingCommentRegex, function() {
var whitespace = arguments[1], comment = arguments[2];
if (whitespace)
prefixNodes.push(document.createTextNode(whitespace));
prefixNodes.push(document.createComment(comment));
return "";
});
}
// Trim whitespace, otherwise indexOf won't work as expected
var tags = ko.utils.stringTrim(html).toLowerCase(), div = document.createElement("div");
// Finds the first match from the left column, and returns the corresponding "wrap" data from the right column
var wrap = tags.match(/^<(thead|tbody|tfoot)/) && [1, "<table>", "</table>"] ||
!tags.indexOf("<tr") && [2, "<table><tbody>", "</tbody></table>"] ||
(!tags.indexOf("<td") || !tags.indexOf("<th")) && [3, "<table><tbody><tr>", "</tr></tbody></table>"] ||
/* anything else */ [0, "", ""];
// Go to html and back, then peel off extra wrappers
div.innerHTML = wrap[1] + html + wrap[2];
// Move to the right depth
while (wrap[0]--)
div = div.lastChild;
return prefixNodes.concat(ko.utils.makeArray(div.childNodes));
}
ko.utils.parseHtmlFragment = function(html) {
return typeof jQuery != 'undefined' ? jQuery['clean']([html]) // As below, benefit from jQuery's optimisations where possible
: simpleHtmlParse(html); // ... otherwise, this simple logic will do in most common cases.
};
ko.utils.setHtml = function(node, html) {
ko.utils.emptyDomNode(node);
if ((html !== null) && (html !== undefined)) {
if (typeof html != 'string')
html = html.toString();
// jQuery contains a lot of sophisticated code to parse arbitrary HTML fragments,
// for example <tr> elements which are not normally allowed to exist on their own.
// If you've referenced jQuery we'll use that rather than duplicating its code.
if (typeof jQuery != 'undefined') {
jQuery(node)['html'](html);
} else {
// ... otherwise, use KO's own parsing logic.
var parsedNodes = ko.utils.parseHtmlFragment(html);
for (var i = 0; i < parsedNodes.length; i++)
node.appendChild(parsedNodes[i]);
}
}
};
})();
ko.exportSymbol('ko.utils.parseHtmlFragment', ko.utils.parseHtmlFragment);
ko.memoization = (function () {
var memos = {};
function randomMax8HexChars() {
return (((1 + Math.random()) * 0x100000000) | 0).toString(16).substring(1);
}
function generateRandomId() {
return randomMax8HexChars() + randomMax8HexChars();
}
function findMemoNodes(rootNode, appendToArray) {
if (!rootNode)
return;
if (rootNode.nodeType == 8) {
var memoId = ko.memoization.parseMemoText(rootNode.nodeValue);
if (memoId != null)
appendToArray.push({ domNode: rootNode, memoId: memoId });
} else if (rootNode.nodeType == 1) {
for (var i = 0, childNodes = rootNode.childNodes, j = childNodes.length; i < j; i++)
findMemoNodes(childNodes[i], appendToArray);
}
}
return {
memoize: function (callback) {
if (typeof callback != "function")
throw new Error("You can only pass a function to ko.memoization.memoize()");
var memoId = generateRandomId();
memos[memoId] = callback;
return "<!--[ko_memo:" + memoId + "]-->";
},
unmemoize: function (memoId, callbackParams) {
var callback = memos[memoId];
if (callback === undefined)
throw new Error("Couldn't find any memo with ID " + memoId + ". Perhaps it's already been unmemoized.");
try {
callback.apply(null, callbackParams || []);
return true;
}
finally { delete memos[memoId]; }
},
unmemoizeDomNodeAndDescendants: function (domNode, extraCallbackParamsArray) {
var memos = [];
findMemoNodes(domNode, memos);
for (var i = 0, j = memos.length; i < j; i++) {
var node = memos[i].domNode;
var combinedParams = [node];
if (extraCallbackParamsArray)
ko.utils.arrayPushAll(combinedParams, extraCallbackParamsArray);
ko.memoization.unmemoize(memos[i].memoId, combinedParams);
node.nodeValue = ""; // Neuter this node so we don't try to unmemoize it again
if (node.parentNode)
node.parentNode.removeChild(node); // If possible, erase it totally (not always possible - someone else might just hold a reference to it then call unmemoizeDomNodeAndDescendants again)
}
},
parseMemoText: function (memoText) {
var match = memoText.match(/^\[ko_memo\:(.*?)\]$/);
return match ? match[1] : null;
}
};
})();
ko.exportSymbol('ko.memoization', ko.memoization);
ko.exportSymbol('ko.memoization.memoize', ko.memoization.memoize);
ko.exportSymbol('ko.memoization.unmemoize', ko.memoization.unmemoize);
ko.exportSymbol('ko.memoization.parseMemoText', ko.memoization.parseMemoText);
ko.exportSymbol('ko.memoization.unmemoizeDomNodeAndDescendants', ko.memoization.unmemoizeDomNodeAndDescendants);
ko.extenders = {
'throttle': function(target, timeout) {
// Throttling means two things:
// (1) For dependent observables, we throttle *evaluations* so that, no matter how fast its dependencies
// notify updates, the target doesn't re-evaluate (and hence doesn't notify) faster than a certain rate
target['throttleEvaluation'] = timeout;
// (2) For writable targets (observables, or writable dependent observables), we throttle *writes*
// so the target cannot change value synchronously or faster than a certain rate
var writeTimeoutInstance = null;
return ko.dependentObservable({
'read': target,
'write': function(value) {
clearTimeout(writeTimeoutInstance);
writeTimeoutInstance = setTimeout(function() {
target(value);
}, timeout);
}
});
}
};
function applyExtenders(requestedExtenders) {
var target = this;
if (requestedExtenders) {
for (var key in requestedExtenders) {
var extenderHandler = ko.extenders[key];
if (typeof extenderHandler == 'function') {
target = extenderHandler(target, requestedExtenders[key]);
}
}
}
return target;
}
ko.exportSymbol('ko.extenders', ko.extenders);
ko.subscription = function (callback, disposeCallback) {
this.callback = callback;
this.disposeCallback = disposeCallback;
ko.exportProperty(this, 'dispose', this.dispose);
};
ko.subscription.prototype.dispose = function () {
this.isDisposed = true;
this.disposeCallback();
};
ko.subscribable = function () {
this._subscriptions = [];
ko.utils.extend(this, ko.subscribable['fn']);
ko.exportProperty(this, 'subscribe', this.subscribe);
ko.exportProperty(this, 'extend', this.extend);
ko.exportProperty(this, 'notifySubscribers', this.notifySubscribers);
ko.exportProperty(this, 'getSubscriptionsCount', this.getSubscriptionsCount);
}
ko.subscribable['fn'] = {
subscribe: function (callback, callbackTarget) {
var boundCallback = callbackTarget ? callback.bind(callbackTarget) : callback;
var subscription = new ko.subscription(boundCallback, function () {
ko.utils.arrayRemoveItem(this._subscriptions, subscription);
}.bind(this));
this._subscriptions.push(subscription);
return subscription;
},
notifySubscribers: function (valueToNotify) {
ko.utils.arrayForEach(this._subscriptions.slice(0), function (subscription) {
// In case a subscription was disposed during the arrayForEach cycle, check
// for isDisposed on each subscription before invoking its callback
if (subscription && (subscription.isDisposed !== true))
subscription.callback(valueToNotify);
});
},
getSubscriptionsCount: function () {
return this._subscriptions.length;
},
extend: applyExtenders
};
ko.isSubscribable = function (instance) {
return typeof instance.subscribe == "function" && typeof instance.notifySubscribers == "function";
};
ko.exportSymbol('ko.subscribable', ko.subscribable);
ko.exportSymbol('ko.isSubscribable', ko.isSubscribable);
ko.dependencyDetection = (function () {
var _frames = [];
return {
begin: function (callback) {
_frames.push({ callback: callback, distinctDependencies:[] });
},
end: function () {
_frames.pop();
},
registerDependency: function (subscribable) {
if (!ko.isSubscribable(subscribable))
throw "Only subscribable things can act as dependencies";
if (_frames.length > 0) {
var topFrame = _frames[_frames.length - 1];
if (ko.utils.arrayIndexOf(topFrame.distinctDependencies, subscribable) >= 0)
return;
topFrame.distinctDependencies.push(subscribable);
topFrame.callback(subscribable);
}
}
};
})();var primitiveTypes = { 'undefined':true, 'boolean':true, 'number':true, 'string':true };
ko.observable = function (initialValue) {
var _latestValue = initialValue;
function observable() {
if (arguments.length > 0) {
// Write
// Ignore writes if the value hasn't changed
if ((!observable['equalityComparer']) || !observable['equalityComparer'](_latestValue, arguments[0])) {
_latestValue = arguments[0];
observable.notifySubscribers(_latestValue);
}
return this; // Permits chained assignments
}
else {
// Read
ko.dependencyDetection.registerDependency(observable); // The caller only needs to be notified of changes if they did a "read" operation
return _latestValue;
}
}
ko.subscribable.call(observable);
observable.valueHasMutated = function () { observable.notifySubscribers(_latestValue); }
ko.utils.extend(observable, ko.observable['fn']);
ko.exportProperty(observable, "valueHasMutated", observable.valueHasMutated);
return observable;
}
ko.observable['fn'] = {
__ko_proto__: ko.observable,
"equalityComparer": function valuesArePrimitiveAndEqual(a, b) {
var oldValueIsPrimitive = (a === null) || (typeof(a) in primitiveTypes);
return oldValueIsPrimitive ? (a === b) : false;
}
};
ko.isObservable = function (instance) {
if ((instance === null) || (instance === undefined) || (instance.__ko_proto__ === undefined)) return false;
if (instance.__ko_proto__ === ko.observable) return true;
return ko.isObservable(instance.__ko_proto__); // Walk the prototype chain
}
ko.isWriteableObservable = function (instance) {
// Observable
if ((typeof instance == "function") && instance.__ko_proto__ === ko.observable)
return true;
// Writeable dependent observable
if ((typeof instance == "function") && (instance.__ko_proto__ === ko.dependentObservable) && (instance.hasWriteFunction))
return true;
// Anything else
return false;
}
ko.exportSymbol('ko.observable', ko.observable);
ko.exportSymbol('ko.isObservable', ko.isObservable);
ko.exportSymbol('ko.isWriteableObservable', ko.isWriteableObservable);
ko.observableArray = function (initialValues) {
if (arguments.length == 0) {
// Zero-parameter constructor initializes to empty array
initialValues = [];
}
if ((initialValues !== null) && (initialValues !== undefined) && !('length' in initialValues))
throw new Error("The argument passed when initializing an observable array must be an array, or null, or undefined.");
var result = new ko.observable(initialValues);
ko.utils.extend(result, ko.observableArray['fn']);
ko.exportProperty(result, "remove", result.remove);
ko.exportProperty(result, "removeAll", result.removeAll);
ko.exportProperty(result, "destroy", result.destroy);
ko.exportProperty(result, "destroyAll", result.destroyAll);
ko.exportProperty(result, "indexOf", result.indexOf);
ko.exportProperty(result, "replace", result.replace);
return result;
}
ko.observableArray['fn'] = {
remove: function (valueOrPredicate) {
var underlyingArray = this();
var remainingValues = [];
var removedValues = [];
var predicate = typeof valueOrPredicate == "function" ? valueOrPredicate : function (value) { return value === valueOrPredicate; };
for (var i = 0, j = underlyingArray.length; i < j; i++) {
var value = underlyingArray[i];
if (!predicate(value))
remainingValues.push(value);
else
removedValues.push(value);
}
this(remainingValues);
return removedValues;
},
removeAll: function (arrayOfValues) {
// If you passed zero args, we remove everything
if (arrayOfValues === undefined) {
var allValues = this();
this([]);
return allValues;
}
// If you passed an arg, we interpret it as an array of entries to remove
if (!arrayOfValues)
return [];
return this.remove(function (value) {
return ko.utils.arrayIndexOf(arrayOfValues, value) >= 0;
});
},
destroy: function (valueOrPredicate) {
var underlyingArray = this();
var predicate = typeof valueOrPredicate == "function" ? valueOrPredicate : function (value) { return value === valueOrPredicate; };
for (var i = underlyingArray.length - 1; i >= 0; i--) {
var value = underlyingArray[i];
if (predicate(value))
underlyingArray[i]["_destroy"] = true;
}
this.valueHasMutated();
},
destroyAll: function (arrayOfValues) {
// If you passed zero args, we destroy everything
if (arrayOfValues === undefined)
return this.destroy(function() { return true });
// If you passed an arg, we interpret it as an array of entries to destroy
if (!arrayOfValues)
return [];
return this.destroy(function (value) {
return ko.utils.arrayIndexOf(arrayOfValues, value) >= 0;
});
},
indexOf: function (item) {
var underlyingArray = this();
return ko.utils.arrayIndexOf(underlyingArray, item);
},
replace: function(oldItem, newItem) {
var index = this.indexOf(oldItem);
if (index >= 0) {
this()[index] = newItem;
this.valueHasMutated();
}
}
}
// Populate ko.observableArray.fn with read/write functions from native arrays
ko.utils.arrayForEach(["pop", "push", "reverse", "shift", "sort", "splice", "unshift"], function (methodName) {
ko.observableArray['fn'][methodName] = function () {
var underlyingArray = this();
var methodCallResult = underlyingArray[methodName].apply(underlyingArray, arguments);
this.valueHasMutated();
return methodCallResult;
};
});
// Populate ko.observableArray.fn with read-only functions from native arrays
ko.utils.arrayForEach(["slice"], function (methodName) {
ko.observableArray['fn'][methodName] = function () {
var underlyingArray = this();
return underlyingArray[methodName].apply(underlyingArray, arguments);
};
});
ko.exportSymbol('ko.observableArray', ko.observableArray);
function prepareOptions(evaluatorFunctionOrOptions, evaluatorFunctionTarget, options) {
if (evaluatorFunctionOrOptions && typeof evaluatorFunctionOrOptions == "object") {
// Single-parameter syntax - everything is on this "options" param
options = evaluatorFunctionOrOptions;
} else {
// Multi-parameter syntax - construct the options according to the params passed
options = options || {};
options["read"] = evaluatorFunctionOrOptions || options["read"];
options["owner"] = evaluatorFunctionTarget || options["owner"];
}
// By here, "options" is always non-null
if (typeof options["read"] != "function")
throw "Pass a function that returns the value of the dependentObservable";
return options;
}
ko.dependentObservable = function (evaluatorFunctionOrOptions, evaluatorFunctionTarget, options) {
var _latestValue,
_hasBeenEvaluated = false,
options = prepareOptions(evaluatorFunctionOrOptions, evaluatorFunctionTarget, options);
// Build "disposeWhenNodeIsRemoved" and "disposeWhenNodeIsRemovedCallback" option values
// (Note: "disposeWhenNodeIsRemoved" option both proactively disposes as soon as the node is removed using ko.removeNode(),
// plus adds a "disposeWhen" callback that, on each evaluation, disposes if the node was removed by some other means.)
var disposeWhenNodeIsRemoved = (typeof options["disposeWhenNodeIsRemoved"] == "object") ? options["disposeWhenNodeIsRemoved"] : null;
var disposeWhenNodeIsRemovedCallback = null;
if (disposeWhenNodeIsRemoved) {
disposeWhenNodeIsRemovedCallback = function() { dependentObservable.dispose() };
ko.utils.domNodeDisposal.addDisposeCallback(disposeWhenNodeIsRemoved, disposeWhenNodeIsRemovedCallback);
var existingDisposeWhenFunction = options["disposeWhen"];
options["disposeWhen"] = function () {
return (!ko.utils.domNodeIsAttachedToDocument(disposeWhenNodeIsRemoved))
|| ((typeof existingDisposeWhenFunction == "function") && existingDisposeWhenFunction());
}
}
var _subscriptionsToDependencies = [];
function disposeAllSubscriptionsToDependencies() {
ko.utils.arrayForEach(_subscriptionsToDependencies, function (subscription) {
subscription.dispose();
});
_subscriptionsToDependencies = [];
}
var evaluationTimeoutInstance = null;
function evaluatePossiblyAsync() {
var throttleEvaluationTimeout = dependentObservable['throttleEvaluation'];
if (throttleEvaluationTimeout && throttleEvaluationTimeout >= 0) {
clearTimeout(evaluationTimeoutInstance);
evaluationTimeoutInstance = setTimeout(evaluateImmediate, throttleEvaluationTimeout);
} else
evaluateImmediate();
}
function evaluateImmediate() {
// Don't dispose on first evaluation, because the "disposeWhen" callback might
// e.g., dispose when the associated DOM element isn't in the doc, and it's not
// going to be in the doc until *after* the first evaluation
if ((_hasBeenEvaluated) && typeof options["disposeWhen"] == "function") {
if (options["disposeWhen"]()) {
dependentObservable.dispose();
return;
}
}
try {
disposeAllSubscriptionsToDependencies();
ko.dependencyDetection.begin(function(subscribable) {
_subscriptionsToDependencies.push(subscribable.subscribe(evaluatePossiblyAsync));
});
_latestValue = options["owner"] ? options["read"].call(options["owner"]) : options["read"]();
} finally {
ko.dependencyDetection.end();
}
dependentObservable.notifySubscribers(_latestValue);
_hasBeenEvaluated = true;
}
function dependentObservable() {
if (arguments.length > 0) {
if (typeof options["write"] === "function") {
// Writing a value
var valueForThis = options["owner"]; // If undefined, it will default to "window" by convention. This might change in the future.
options["write"].apply(valueForThis, arguments);
} else {
throw "Cannot write a value to a dependentObservable unless you specify a 'write' option. If you wish to read the current value, don't pass any parameters.";
}
} else {
// Reading the value
if (!_hasBeenEvaluated)
evaluateImmediate();
ko.dependencyDetection.registerDependency(dependentObservable);
return _latestValue;
}
}
dependentObservable.getDependenciesCount = function () { return _subscriptionsToDependencies.length; }
dependentObservable.hasWriteFunction = typeof options["write"] === "function";
dependentObservable.dispose = function () {
if (disposeWhenNodeIsRemoved)
ko.utils.domNodeDisposal.removeDisposeCallback(disposeWhenNodeIsRemoved, disposeWhenNodeIsRemovedCallback);
disposeAllSubscriptionsToDependencies();
};
ko.subscribable.call(dependentObservable);
ko.utils.extend(dependentObservable, ko.dependentObservable['fn']);
if (options['deferEvaluation'] !== true)
evaluateImmediate();
ko.exportProperty(dependentObservable, 'dispose', dependentObservable.dispose);
ko.exportProperty(dependentObservable, 'getDependenciesCount', dependentObservable.getDependenciesCount);
return dependentObservable;
};
ko.dependentObservable['fn'] = {
__ko_proto__: ko.dependentObservable
};
ko.dependentObservable.__ko_proto__ = ko.observable;
ko.exportSymbol('ko.dependentObservable', ko.dependentObservable);
ko.exportSymbol('ko.computed', ko.dependentObservable); // Make "ko.computed" an alias for "ko.dependentObservable"
(function() {
var maxNestedObservableDepth = 10; // Escape the (unlikely) pathalogical case where an observable's current value is itself (or similar reference cycle)
ko.toJS = function(rootObject) {
if (arguments.length == 0)
throw new Error("When calling ko.toJS, pass the object you want to convert.");
// We just unwrap everything at every level in the object graph
return mapJsObjectGraph(rootObject, function(valueToMap) {
// Loop because an observable's value might in turn be another observable wrapper
for (var i = 0; ko.isObservable(valueToMap) && (i < maxNestedObservableDepth); i++)
valueToMap = valueToMap();
return valueToMap;
});
};
ko.toJSON = function(rootObject) {
var plainJavaScriptObject = ko.toJS(rootObject);
return ko.utils.stringifyJson(plainJavaScriptObject);
};
function mapJsObjectGraph(rootObject, mapInputCallback, visitedObjects) {
visitedObjects = visitedObjects || new objectLookup();
rootObject = mapInputCallback(rootObject);
var canHaveProperties = (typeof rootObject == "object") && (rootObject !== null) && (rootObject !== undefined);
if (!canHaveProperties)
return rootObject;
var outputProperties = rootObject instanceof Array ? [] : {};
visitedObjects.save(rootObject, outputProperties);
visitPropertiesOrArrayEntries(rootObject, function(indexer) {
var propertyValue = mapInputCallback(rootObject[indexer]);
switch (typeof propertyValue) {
case "boolean":
case "number":
case "string":
case "function":
outputProperties[indexer] = propertyValue;
break;
case "object":
case "undefined":
var previouslyMappedValue = visitedObjects.get(propertyValue);
outputProperties[indexer] = (previouslyMappedValue !== undefined)
? previouslyMappedValue
: mapJsObjectGraph(propertyValue, mapInputCallback, visitedObjects);
break;
}
});
return outputProperties;
}
function visitPropertiesOrArrayEntries(rootObject, visitorCallback) {
if (rootObject instanceof Array) {
for (var i = 0; i < rootObject.length; i++)
visitorCallback(i);
} else {
for (var propertyName in rootObject)
visitorCallback(propertyName);
}
};
function objectLookup() {
var keys = [];
var values = [];
this.save = function(key, value) {
var existingIndex = ko.utils.arrayIndexOf(keys, key);
if (existingIndex >= 0)
values[existingIndex] = value;
else {
keys.push(key);
values.push(value);
}
};
this.get = function(key) {
var existingIndex = ko.utils.arrayIndexOf(keys, key);
return (existingIndex >= 0) ? values[existingIndex] : undefined;
};
};
})();
ko.exportSymbol('ko.toJS', ko.toJS);
ko.exportSymbol('ko.toJSON', ko.toJSON);(function () {
// Normally, SELECT elements and their OPTIONs can only take value of type 'string' (because the values
// are stored on DOM attributes). ko.selectExtensions provides a way for SELECTs/OPTIONs to have values
// that are arbitrary objects. This is very convenient when implementing things like cascading dropdowns.
ko.selectExtensions = {
readValue : function(element) {
if (element.tagName == 'OPTION') {
if (element['__ko__hasDomDataOptionValue__'] === true)
return ko.utils.domData.get(element, ko.bindingHandlers.options.optionValueDomDataKey);
return element.getAttribute("value");
} else if (element.tagName == 'SELECT')
return element.selectedIndex >= 0 ? ko.selectExtensions.readValue(element.options[element.selectedIndex]) : undefined;
else
return element.value;
},
writeValue: function(element, value) {
if (element.tagName == 'OPTION') {
switch(typeof value) {
case "string":
case "number":
ko.utils.domData.set(element, ko.bindingHandlers.options.optionValueDomDataKey, undefined);
if ('__ko__hasDomDataOptionValue__' in element) { // IE <= 8 throws errors if you delete non-existent properties from a DOM node
delete element['__ko__hasDomDataOptionValue__'];
}
element.value = value;
break;
default:
// Store arbitrary object using DomData
ko.utils.domData.set(element, ko.bindingHandlers.options.optionValueDomDataKey, value);
element['__ko__hasDomDataOptionValue__'] = true;
element.value = "";
break;
}
} else if (element.tagName == 'SELECT') {
for (var i = element.options.length - 1; i >= 0; i--) {
if (ko.selectExtensions.readValue(element.options[i]) == value) {
element.selectedIndex = i;
break;
}
}
} else {
if ((value === null) || (value === undefined))
value = "";
element.value = value;
}
}
};
})();
ko.exportSymbol('ko.selectExtensions', ko.selectExtensions);
ko.exportSymbol('ko.selectExtensions.readValue', ko.selectExtensions.readValue);
ko.exportSymbol('ko.selectExtensions.writeValue', ko.selectExtensions.writeValue);
ko.jsonExpressionRewriting = (function () {
var restoreCapturedTokensRegex = /\@ko_token_(\d+)\@/g;
var javaScriptAssignmentTarget = /^[\_$a-z][\_$a-z0-9]*(\[.*?\])*(\.[\_$a-z][\_$a-z0-9]*(\[.*?\])*)*$/i;
var javaScriptReservedWords = ["true", "false"];
function restoreTokens(string, tokens) {
var prevValue = null;
while (string != prevValue) { // Keep restoring tokens until it no longer makes a difference (they may be nested)
prevValue = string;
string = string.replace(restoreCapturedTokensRegex, function (match, tokenIndex) {
return tokens[tokenIndex];
});
}
return string;
}
function isWriteableValue(expression) {
if (ko.utils.arrayIndexOf(javaScriptReservedWords, ko.utils.stringTrim(expression).toLowerCase()) >= 0)
return false;
return expression.match(javaScriptAssignmentTarget) !== null;
}
function ensureQuoted(key) {
var trimmedKey = ko.utils.stringTrim(key);
switch (trimmedKey.length && trimmedKey.charAt(0)) {
case "'":
case '"':
return key;
default:
return "'" + trimmedKey + "'";
}
}
return {
bindingRewriteValidators: [],
parseObjectLiteral: function(objectLiteralString) {
// A full tokeniser+lexer would add too much weight to this library, so here's a simple parser
// that is sufficient just to split an object literal string into a set of top-level key-value pairs
var str = ko.utils.stringTrim(objectLiteralString);
if (str.length < 3)
return [];
if (str.charAt(0) === "{")// Ignore any braces surrounding the whole object literal
str = str.substring(1, str.length - 1);
// Pull out any string literals and regex literals
var tokens = [];
var tokenStart = null, tokenEndChar;
for (var position = 0; position < str.length; position++) {
var c = str.charAt(position);
if (tokenStart === null) {
switch (c) {
case '"':
case "'":
case "/":
tokenStart = position;
tokenEndChar = c;
break;
}
} else if ((c == tokenEndChar) && (str.charAt(position - 1) !== "\\")) {
var token = str.substring(tokenStart, position + 1);
tokens.push(token);
var replacement = "@ko_token_" + (tokens.length - 1) + "@";
str = str.substring(0, tokenStart) + replacement + str.substring(position + 1);
position -= (token.length - replacement.length);
tokenStart = null;
}
}
// Next pull out balanced paren, brace, and bracket blocks
tokenStart = null;
tokenEndChar = null;
var tokenDepth = 0, tokenStartChar = null;
for (var position = 0; position < str.length; position++) {
var c = str.charAt(position);
if (tokenStart === null) {
switch (c) {
case "{": tokenStart = position; tokenStartChar = c;
tokenEndChar = "}";
break;
case "(": tokenStart = position; tokenStartChar = c;
tokenEndChar = ")";
break;
case "[": tokenStart = position; tokenStartChar = c;
tokenEndChar = "]";
break;
}
}
if (c === tokenStartChar)
tokenDepth++;
else if (c === tokenEndChar) {
tokenDepth--;
if (tokenDepth === 0) {
var token = str.substring(tokenStart, position + 1);
tokens.push(token);
var replacement = "@ko_token_" + (tokens.length - 1) + "@";
str = str.substring(0, tokenStart) + replacement + str.substring(position + 1);
position -= (token.length - replacement.length);
tokenStart = null;
}
}
}
// Now we can safely split on commas to get the key/value pairs
var result = [];
var keyValuePairs = str.split(",");
for (var i = 0, j = keyValuePairs.length; i < j; i++) {
var pair = keyValuePairs[i];
var colonPos = pair.indexOf(":");
if ((colonPos > 0) && (colonPos < pair.length - 1)) {
var key = pair.substring(0, colonPos);
var value = pair.substring(colonPos + 1);
result.push({ 'key': restoreTokens(key, tokens), 'value': restoreTokens(value, tokens) });
} else {
result.push({ 'unknown': restoreTokens(pair, tokens) });
}
}
return result;
},
insertPropertyAccessorsIntoJson: function (objectLiteralStringOrKeyValueArray) {
var keyValueArray = typeof objectLiteralStringOrKeyValueArray === "string"
? ko.jsonExpressionRewriting.parseObjectLiteral(objectLiteralStringOrKeyValueArray)
: objectLiteralStringOrKeyValueArray;
var resultStrings = [], propertyAccessorResultStrings = [];
var keyValueEntry;
for (var i = 0; keyValueEntry = keyValueArray[i]; i++) {
if (resultStrings.length > 0)
resultStrings.push(",");
if (keyValueEntry['key']) {
var quotedKey = ensureQuoted(keyValueEntry['key']), val = keyValueEntry['value'];
resultStrings.push(quotedKey);
resultStrings.push(":");
resultStrings.push(val);
if (isWriteableValue(ko.utils.stringTrim(val))) {
if (propertyAccessorResultStrings.length > 0)
propertyAccessorResultStrings.push(", ");
propertyAccessorResultStrings.push(quotedKey + " : function(__ko_value) { " + val + " = __ko_value; }");
}
} else if (keyValueEntry['unknown']) {
resultStrings.push(keyValueEntry['unknown']);
}
}
var combinedResult = resultStrings.join("");
if (propertyAccessorResultStrings.length > 0) {
var allPropertyAccessors = propertyAccessorResultStrings.join("");
combinedResult = combinedResult + ", '_ko_property_writers' : { " + allPropertyAccessors + " } ";
}
return combinedResult;
},
keyValueArrayContainsKey: function(keyValueArray, key) {
for (var i = 0; i < keyValueArray.length; i++)
if (ko.utils.stringTrim(keyValueArray[i]['key']) == key)
return true;
return false;
}
};
})();
ko.exportSymbol('ko.jsonExpressionRewriting', ko.jsonExpressionRewriting);
ko.exportSymbol('ko.jsonExpressionRewriting.bindingRewriteValidators', ko.jsonExpressionRewriting.bindingRewriteValidators);
ko.exportSymbol('ko.jsonExpressionRewriting.parseObjectLiteral', ko.jsonExpressionRewriting.parseObjectLiteral);
ko.exportSymbol('ko.jsonExpressionRewriting.insertPropertyAccessorsIntoJson', ko.jsonExpressionRewriting.insertPropertyAccessorsIntoJson);
(function() {
// "Virtual elements" is an abstraction on top of the usual DOM API which understands the notion that comment nodes
// may be used to represent hierarchy (in addition to the DOM's natural hierarchy).
// If you call the DOM-manipulating functions on ko.virtualElements, you will be able to read and write the state
// of that virtual hierarchy
//
// The point of all this is to support containerless templates (e.g., <!-- ko foreach:someCollection -->blah<!-- /ko -->)
// without having to scatter special cases all over the binding and templating code.
var startCommentRegex = /^\s*ko\s+(.*\:.*)\s*$/;
var endCommentRegex = /^\s*\/ko\s*$/;
function isStartComment(node) {
return (node.nodeType == 8) && node.nodeValue.match(startCommentRegex);
}
function isEndComment(node) {
return (node.nodeType == 8) && node.nodeValue.match(endCommentRegex);
}
function getVirtualChildren(startComment) {
var currentNode = startComment;
var depth = 1;
var children = [];
while (currentNode = currentNode.nextSibling) {
if (isEndComment(currentNode)) {
depth--;
if (depth === 0)
return children;
}
children.push(currentNode);
if (isStartComment(currentNode))
depth++;
}
throw new Error("Cannot find closing comment tag to match: " + startComment.nodeValue);
}
function getMatchingEndComment(startComment) {
var allVirtualChildren = getVirtualChildren(startComment);
if (allVirtualChildren.length > 0)
return allVirtualChildren[allVirtualChildren.length - 1].nextSibling;
return startComment.nextSibling;
}
function nodeArrayToText(nodeArray, cleanNodes) {
var texts = [];
for (var i = 0, j = nodeArray.length; i < j; i++) {
if (cleanNodes)
ko.utils.domNodeDisposal.cleanNode(nodeArray[i]);
texts.push(ko.utils.outerHTML(nodeArray[i]));
}
return String.prototype.concat.apply("", texts);
}
ko.virtualElements = {
allowedBindings: {},
childNodes: function(node) {
return isStartComment(node) ? getVirtualChildren(node) : node.childNodes;
},
emptyNode: function(node) {
if (!isStartComment(node))
ko.utils.emptyDomNode(node);
else {
var virtualChildren = ko.virtualElements.childNodes(node);
for (var i = 0, j = virtualChildren.length; i < j; i++)
ko.removeNode(virtualChildren[i]);
}
},
setDomNodeChildren: function(node, childNodes) {
if (!isStartComment(node))
ko.utils.setDomNodeChildren(node, childNodes);
else {
ko.virtualElements.emptyNode(node);
var endCommentNode = node.nextSibling; // Must be the next sibling, as we just emptied the children
for (var i = 0, j = childNodes.length; i < j; i++)
endCommentNode.parentNode.insertBefore(childNodes[i], endCommentNode);
}
},
prepend: function(containerNode, nodeToPrepend) {
if (!isStartComment(containerNode)) {
if (containerNode.firstChild)
containerNode.insertBefore(nodeToPrepend, containerNode.firstChild);
else
containerNode.appendChild(nodeToPrepend);
} else {
// Start comments must always have a parent and at least one following sibling (the end comment)
containerNode.parentNode.insertBefore(nodeToPrepend, containerNode.nextSibling);
}
},
insertAfter: function(containerNode, nodeToInsert, insertAfterNode) {
if (!isStartComment(containerNode)) {
// Insert after insertion point
if (insertAfterNode.nextSibling)
containerNode.insertBefore(nodeToInsert, insertAfterNode.nextSibling);
else
containerNode.appendChild(nodeToInsert);
} else {
// Children of start comments must always have a parent and at least one following sibling (the end comment)
containerNode.parentNode.insertBefore(nodeToInsert, insertAfterNode.nextSibling);
}
},
nextSibling: function(node) {
if (!isStartComment(node)) {
if (node.nextSibling && isEndComment(node.nextSibling))
return undefined;
return node.nextSibling;
} else {
return getMatchingEndComment(node).nextSibling;
}
},
virtualNodeBindingValue: function(node) {
var regexMatch = isStartComment(node);
return regexMatch ? regexMatch[1] : null;
},
extractAnonymousTemplateIfVirtualElement: function(node) {
if (ko.virtualElements.virtualNodeBindingValue(node)) {
// Empty out the virtual children, and associate "node" with an anonymous template matching its previous virtual children
var virtualChildren = ko.virtualElements.childNodes(node);
var anonymousTemplateText = nodeArrayToText(virtualChildren, true);
ko.virtualElements.emptyNode(node);
new ko.templateSources.anonymousTemplate(node).text(anonymousTemplateText);
}
}
};
})();
(function() {
var defaultBindingAttributeName = "data-bind";
ko.bindingProvider = function() { };
ko.utils.extend(ko.bindingProvider.prototype, {
'nodeHasBindings': function(node) {
switch (node.nodeType) {
case 1: return node.getAttribute(defaultBindingAttributeName) != null; // Element
case 8: return ko.virtualElements.virtualNodeBindingValue(node) != null; // Comment node
default: return false;
}
},
'getBindings': function(node, bindingContext) {
var bindingsString = this['getBindingsString'](node, bindingContext);
return bindingsString ? this['parseBindingsString'](bindingsString, bindingContext) : null;
},
// The following function is only used internally by this default provider.
// It's not part of the interface definition for a general binding provider.
'getBindingsString': function(node, bindingContext) {
switch (node.nodeType) {
case 1: return node.getAttribute(defaultBindingAttributeName); // Element
case 8: return ko.virtualElements.virtualNodeBindingValue(node); // Comment node
default: return null;
}
},
// The following function is only used internally by this default provider.
// It's not part of the interface definition for a general binding provider.
'parseBindingsString': function(bindingsString, bindingContext) {
try {
var viewModel = bindingContext['$data'];
var rewrittenBindings = " { " + ko.jsonExpressionRewriting.insertPropertyAccessorsIntoJson(bindingsString) + " } ";
return ko.utils.evalWithinScope(rewrittenBindings, viewModel === null ? window : viewModel, bindingContext);
} catch (ex) {
throw new Error("Unable to parse bindings.\nMessage: " + ex + ";\nBindings value: " + bindingsString);
}
}
});
ko.bindingProvider['instance'] = new ko.bindingProvider();
})();
ko.exportSymbol('ko.bindingProvider', ko.bindingProvider);(function () {
ko.bindingHandlers = {};
ko.bindingContext = function(dataItem, parentBindingContext) {
this['$data'] = dataItem;
if (parentBindingContext) {
this['$parent'] = parentBindingContext['$data'];
this['$parents'] = (parentBindingContext['$parents'] || []).slice(0);
this['$parents'].unshift(this['$parent']);
this['$root'] = parentBindingContext['$root'];
} else {
this['$parents'] = [];
this['$root'] = dataItem;
}
}
ko.bindingContext.prototype = {
createChildContext: function (dataItem) {
return new ko.bindingContext(dataItem, this);
}
};
function validateThatBindingIsAllowedForVirtualElements(bindingName) {
var validator = ko.virtualElements.allowedBindings[bindingName];
if (!validator)
throw new Error("The binding '" + bindingName + "' cannot be used with virtual elements")
}
function applyBindingsToDescendantsInternal (viewModel, elementVerified) {
var currentChild, nextInQueue = elementVerified.childNodes[0];
while (currentChild = nextInQueue) {
// Keep a record of the next child *before* applying bindings, in case the binding removes the current child from its position
nextInQueue = ko.virtualElements.nextSibling(currentChild);
applyBindingsToNodeAndDescendantsInternal(viewModel, currentChild, false);
}
}
function applyBindingsToNodeAndDescendantsInternal (viewModel, nodeVerified, isRootNodeForBindingContext) {
var shouldBindDescendants = true;
// Perf optimisation: Apply bindings only if...
// (1) It's a root element for this binding context, as we will need to store the binding context on this node
// Note that we can't store binding contexts on non-elements (e.g., text nodes), as IE doesn't allow expando properties for those
// (2) It might have bindings (e.g., it has a data-bind attribute, or it's a marker for a containerless template)
var isElement = (nodeVerified.nodeType == 1);
var shouldApplyBindings = (isElement && isRootNodeForBindingContext) // Case (1)
|| ko.bindingProvider['instance']['nodeHasBindings'](nodeVerified); // Case (2)
if (shouldApplyBindings)
shouldBindDescendants = applyBindingsToNodeInternal(nodeVerified, null, viewModel, isRootNodeForBindingContext).shouldBindDescendants;
if (isElement && shouldBindDescendants)
applyBindingsToDescendantsInternal(viewModel, nodeVerified);
}
function applyBindingsToNodeInternal (node, bindings, viewModelOrBindingContext, isRootNodeForBindingContext) {
var isFirstEvaluation = true;
// Pre-process any anonymous template bounded by comment nodes
ko.virtualElements.extractAnonymousTemplateIfVirtualElement(node);
// Each time the dependentObservable is evaluated (after data changes),
// the binding attribute is reparsed so that it can pick out the correct
// model properties in the context of the changed data.
// DOM event callbacks need to be able to access this changed data,
// so we need a single parsedBindings variable (shared by all callbacks
// associated with this node's bindings) that all the closures can access.
var parsedBindings;
function makeValueAccessor(bindingKey) {
return function () { return parsedBindings[bindingKey] }
}
function parsedBindingsAccessor() {
return parsedBindings;
}
var bindingHandlerThatControlsDescendantBindings;
new ko.dependentObservable(
function () {
// Ensure we have a nonnull binding context to work with
var bindingContextInstance = viewModelOrBindingContext && (viewModelOrBindingContext instanceof ko.bindingContext)
? viewModelOrBindingContext
: new ko.bindingContext(ko.utils.unwrapObservable(viewModelOrBindingContext));
var viewModel = bindingContextInstance['$data'];
// We only need to store the bindingContext at the root of the subtree where it applies
// as all descendants will be able to find it by scanning up their ancestry
if (isRootNodeForBindingContext)
ko.storedBindingContextForNode(node, bindingContextInstance);
// Use evaluatedBindings if given, otherwise fall back on asking the bindings provider to give us some bindings
var evaluatedBindings = (typeof bindings == "function") ? bindings() : bindings;
parsedBindings = evaluatedBindings || ko.bindingProvider['instance']['getBindings'](node, bindingContextInstance);
if (parsedBindings) {
// First run all the inits, so bindings can register for notification on changes
if (isFirstEvaluation) {
for (var bindingKey in parsedBindings) {
var binding = ko.bindingHandlers[bindingKey];
if (binding && node.nodeType === 8)
validateThatBindingIsAllowedForVirtualElements(bindingKey);
if (binding && typeof binding["init"] == "function") {
var handlerInitFn = binding["init"];
var initResult = handlerInitFn(node, makeValueAccessor(bindingKey), parsedBindingsAccessor, viewModel, bindingContextInstance);
// If this binding handler claims to control descendant bindings, make a note of this
if (initResult && initResult['controlsDescendantBindings']) {
if (bindingHandlerThatControlsDescendantBindings !== undefined)
throw new Error("Multiple bindings (" + bindingHandlerThatControlsDescendantBindings + " and " + bindingKey + ") are trying to control descendant bindings of the same element. You cannot use these bindings together on the same element.");
bindingHandlerThatControlsDescendantBindings = bindingKey;
}
}
}
}
// ... then run all the updates, which might trigger changes even on the first evaluation
for (var bindingKey in parsedBindings) {
var binding = ko.bindingHandlers[bindingKey];
if (binding && typeof binding["update"] == "function") {
var handlerUpdateFn = binding["update"];
handlerUpdateFn(node, makeValueAccessor(bindingKey), parsedBindingsAccessor, viewModel, bindingContextInstance);
}
}
}
},
null,
{ 'disposeWhenNodeIsRemoved' : node }
);
isFirstEvaluation = false;
return {
shouldBindDescendants: bindingHandlerThatControlsDescendantBindings === undefined
};
};
var storedBindingContextDomDataKey = "__ko_bindingContext__";
ko.storedBindingContextForNode = function (node, bindingContext) {
if (arguments.length == 2)
ko.utils.domData.set(node, storedBindingContextDomDataKey, bindingContext);
else
return ko.utils.domData.get(node, storedBindingContextDomDataKey);
}
ko.applyBindingsToNode = function (node, bindings, viewModel) {
return applyBindingsToNodeInternal(node, bindings, viewModel, true);
};
ko.applyBindings = function (viewModel, rootNode) {
if (rootNode && (rootNode.nodeType !== 1) && (rootNode.nodeType !== 8))
throw new Error("ko.applyBindings: first parameter should be your view model; second parameter should be a DOM node");
rootNode = rootNode || window.document.body; // Make "rootNode" parameter optional
applyBindingsToNodeAndDescendantsInternal(viewModel, rootNode, true);
};
// Retrieving binding context from arbitrary nodes
ko.contextFor = function(node) {
// We can only do something meaningful for elements and comment nodes (in particular, not text nodes, as IE can't store domdata for them)
switch (node.nodeType) {
case 1:
case 8:
var context = ko.storedBindingContextForNode(node);
if (context) return context;
if (node.parentNode) return ko.contextFor(node.parentNode);
break;
}
return undefined;
};
ko.dataFor = function(node) {
var context = ko.contextFor(node);
return context ? context['$data'] : undefined;
};
ko.exportSymbol('ko.bindingHandlers', ko.bindingHandlers);
ko.exportSymbol('ko.applyBindings', ko.applyBindings);
ko.exportSymbol('ko.applyBindingsToNode', ko.applyBindingsToNode);
ko.exportSymbol('ko.contextFor', ko.contextFor);
ko.exportSymbol('ko.dataFor', ko.dataFor);
})();// For certain common events (currently just 'click'), allow a simplified data-binding syntax
// e.g. click:handler instead of the usual full-length event:{click:handler}
var eventHandlersWithShortcuts = ['click'];
ko.utils.arrayForEach(eventHandlersWithShortcuts, function(eventName) {
ko.bindingHandlers[eventName] = {
'init': function(element, valueAccessor, allBindingsAccessor, viewModel) {
var newValueAccessor = function () {
var result = {};
result[eventName] = valueAccessor();
return result;
};
return ko.bindingHandlers['event']['init'].call(this, element, newValueAccessor, allBindingsAccessor, viewModel);
}
}
});
ko.bindingHandlers['event'] = {
'init' : function (element, valueAccessor, allBindingsAccessor, viewModel) {
var eventsToHandle = valueAccessor() || {};
for(var eventNameOutsideClosure in eventsToHandle) {
(function() {
var eventName = eventNameOutsideClosure; // Separate variable to be captured by event handler closure
if (typeof eventName == "string") {
ko.utils.registerEventHandler(element, eventName, function (event) {
var handlerReturnValue;
var handlerFunction = valueAccessor()[eventName];
var allBindings = allBindingsAccessor();
try {
handlerReturnValue = handlerFunction.apply(viewModel, arguments);
} finally {
if (handlerReturnValue !== true) { // Normally we want to prevent default action. Developer can override this be explicitly returning true.
if (event.preventDefault)
event.preventDefault();
else
event.returnValue = false;
}
}
var bubble = allBindings[eventName + 'Bubble'] !== false;
if (!bubble) {
event.cancelBubble = true;
if (event.stopPropagation)
event.stopPropagation();
}
});
}
})();
}
}
};
ko.bindingHandlers['submit'] = {
'init': function (element, valueAccessor, allBindingsAccessor, viewModel) {
if (typeof valueAccessor() != "function")
throw new Error("The value for a submit binding must be a function to invoke on submit");
ko.utils.registerEventHandler(element, "submit", function (event) {
var handlerReturnValue;
var value = valueAccessor();
try { handlerReturnValue = value.call(viewModel, element); }
finally {
if (handlerReturnValue !== true) { // Normally we want to prevent default action. Developer can override this be explicitly returning true.
if (event.preventDefault)
event.preventDefault();
else
event.returnValue = false;
}
}
});
}
};
ko.bindingHandlers['visible'] = {
'update': function (element, valueAccessor) {
var value = ko.utils.unwrapObservable(valueAccessor());
var isCurrentlyVisible = !(element.style.display == "none");
if (value && !isCurrentlyVisible)
element.style.display = "";
else if ((!value) && isCurrentlyVisible)
element.style.display = "none";
}
}
ko.bindingHandlers['enable'] = {
'update': function (element, valueAccessor) {
var value = ko.utils.unwrapObservable(valueAccessor());
if (value && element.disabled)
element.removeAttribute("disabled");
else if ((!value) && (!element.disabled))
element.disabled = true;
}
};
ko.bindingHandlers['disable'] = {
'update': function (element, valueAccessor) {
ko.bindingHandlers['enable']['update'](element, function() { return !ko.utils.unwrapObservable(valueAccessor()) });
}
};
ko.bindingHandlers['value'] = {
'init': function (element, valueAccessor, allBindingsAccessor) {
var eventName = allBindingsAccessor()["valueUpdate"] || "change";
// The syntax "after<eventname>" means "run the handler asynchronously after the event"
// This is useful, for example, to catch "keydown" events after the browser has updated the control
// (otherwise, ko.selectExtensions.readValue(this) will receive the control's value *before* the key event)
var handleEventAsynchronously = false;
if (ko.utils.stringStartsWith(eventName, "after")) {
handleEventAsynchronously = true;
eventName = eventName.substring("after".length);
}
var runEventHandler = handleEventAsynchronously ? function(handler) { setTimeout(handler, 0) }
: function(handler) { handler() };
ko.utils.registerEventHandler(element, eventName, function () {
runEventHandler(function() {
var modelValue = valueAccessor();
var elementValue = ko.selectExtensions.readValue(element);
if (ko.isWriteableObservable(modelValue))
modelValue(elementValue);
else {
var allBindings = allBindingsAccessor();
if (allBindings['_ko_property_writers'] && allBindings['_ko_property_writers']['value'])
allBindings['_ko_property_writers']['value'](elementValue);
}
});
});
},
'update': function (element, valueAccessor) {
var newValue = ko.utils.unwrapObservable(valueAccessor());
var elementValue = ko.selectExtensions.readValue(element);
var valueHasChanged = (newValue != elementValue);
// JavaScript's 0 == "" behavious is unfortunate here as it prevents writing 0 to an empty text box (loose equality suggests the values are the same).
// We don't want to do a strict equality comparison as that is more confusing for developers in certain cases, so we specifically special case 0 != "" here.
if ((newValue === 0) && (elementValue !== 0) && (elementValue !== "0"))
valueHasChanged = true;
if (valueHasChanged) {
var applyValueAction = function () { ko.selectExtensions.writeValue(element, newValue); };
applyValueAction();
// Workaround for IE6 bug: It won't reliably apply values to SELECT nodes during the same execution thread
// right after you've changed the set of OPTION nodes on it. So for that node type, we'll schedule a second thread
// to apply the value as well.
var alsoApplyAsynchronously = element.tagName == "SELECT";
if (alsoApplyAsynchronously)
setTimeout(applyValueAction, 0);
}
// For SELECT nodes, you're not allowed to have a model value that disagrees with the UI selection, so if there is a
// difference, treat it as a change that should be written back to the model
if (element.tagName == "SELECT") {
elementValue = ko.selectExtensions.readValue(element);
if(elementValue !== newValue)
ko.utils.triggerEvent(element, "change");
}
}
};
ko.bindingHandlers['options'] = {
'update': function (element, valueAccessor, allBindingsAccessor) {
if (element.tagName != "SELECT")
throw new Error("options binding applies only to SELECT elements");
var previousSelectedValues = ko.utils.arrayMap(ko.utils.arrayFilter(element.childNodes, function (node) {
return node.tagName && node.tagName == "OPTION" && node.selected;
}), function (node) {
return ko.selectExtensions.readValue(node) || node.innerText || node.textContent;
});
var previousScrollTop = element.scrollTop;
var value = ko.utils.unwrapObservable(valueAccessor());
var selectedValue = element.value;
ko.utils.emptyDomNode(element);
if (value) {
var allBindings = allBindingsAccessor();
if (typeof value.length != "number")
value = [value];
if (allBindings['optionsCaption']) {
var option = document.createElement("OPTION");
option.innerHTML = allBindings['optionsCaption'];
ko.selectExtensions.writeValue(option, undefined);
element.appendChild(option);
}
for (var i = 0, j = value.length; i < j; i++) {
var option = document.createElement("OPTION");
var optionValue = typeof allBindings['optionsValue'] == "string" ? value[i][allBindings['optionsValue']] : value[i];
// Pick some text to appear in the drop-down list for this data value
var optionsTextValue = allBindings['optionsText'];
if (typeof optionsTextValue == "function")
optionText = optionsTextValue(value[i]); // Given a function; run it against the data value
else if (typeof optionsTextValue == "string")
optionText = value[i][optionsTextValue]; // Given a string; treat it as a property name on the data value
else
optionText = optionValue; // Given no optionsText arg; use the data value itself
optionValue = ko.utils.unwrapObservable(optionValue);
optionText = ko.utils.unwrapObservable(optionText);
ko.selectExtensions.writeValue(option, optionValue);
option.innerHTML = optionText.toString();
element.appendChild(option);
}
// IE6 doesn't like us to assign selection to OPTION nodes before they're added to the document.
// That's why we first added them without selection. Now it's time to set the selection.
var newOptions = element.getElementsByTagName("OPTION");
var countSelectionsRetained = 0;
for (var i = 0, j = newOptions.length; i < j; i++) {
if (ko.utils.arrayIndexOf(previousSelectedValues, ko.selectExtensions.readValue(newOptions[i])) >= 0) {
ko.utils.setOptionNodeSelectionState(newOptions[i], true);
countSelectionsRetained++;
}
}
if (previousScrollTop)
element.scrollTop = previousScrollTop;
}
}
};
ko.bindingHandlers['options'].optionValueDomDataKey = '__ko.bindingHandlers.options.optionValueDomData__';
ko.bindingHandlers['selectedOptions'] = {
getSelectedValuesFromSelectNode: function (selectNode) {
var result = [];
var nodes = selectNode.childNodes;
for (var i = 0, j = nodes.length; i < j; i++) {
var node = nodes[i];
if ((node.tagName == "OPTION") && node.selected)
result.push(ko.selectExtensions.readValue(node));
}
return result;
},
'init': function (element, valueAccessor, allBindingsAccessor) {
ko.utils.registerEventHandler(element, "change", function () {
var value = valueAccessor();
if (ko.isWriteableObservable(value))
value(ko.bindingHandlers['selectedOptions'].getSelectedValuesFromSelectNode(this));
else {
var allBindings = allBindingsAccessor();
if (allBindings['_ko_property_writers'] && allBindings['_ko_property_writers']['value'])
allBindings['_ko_property_writers']['value'](ko.bindingHandlers['selectedOptions'].getSelectedValuesFromSelectNode(this));
}
});
},
'update': function (element, valueAccessor) {
if (element.tagName != "SELECT")
throw new Error("values binding applies only to SELECT elements");
var newValue = ko.utils.unwrapObservable(valueAccessor());
if (newValue && typeof newValue.length == "number") {
var nodes = element.childNodes;
for (var i = 0, j = nodes.length; i < j; i++) {
var node = nodes[i];
if (node.tagName == "OPTION")
ko.utils.setOptionNodeSelectionState(node, ko.utils.arrayIndexOf(newValue, ko.selectExtensions.readValue(node)) >= 0);
}
}
}
};
ko.bindingHandlers['text'] = {
'update': function (element, valueAccessor) {
var value = ko.utils.unwrapObservable(valueAccessor());
if ((value === null) || (value === undefined))
value = "";
typeof element.innerText == "string" ? element.innerText = value
: element.textContent = value;
}
};
ko.bindingHandlers['html'] = {
'init': function() {
// Prevent binding on the dynamically-injected HTML (as developers are unlikely to expect that, and it has security implications)
return { 'controlsDescendantBindings': true };
},
'update': function (element, valueAccessor) {
var value = ko.utils.unwrapObservable(valueAccessor());
ko.utils.setHtml(element, value);
}
};
ko.bindingHandlers['css'] = {
'update': function (element, valueAccessor) {
var value = ko.utils.unwrapObservable(valueAccessor() || {});
for (var className in value) {
if (typeof className == "string") {
var shouldHaveClass = ko.utils.unwrapObservable(value[className]);
ko.utils.toggleDomNodeCssClass(element, className, shouldHaveClass);
}
}
}
};
ko.bindingHandlers['style'] = {
'update': function (element, valueAccessor) {
var value = ko.utils.unwrapObservable(valueAccessor() || {});
for (var styleName in value) {
if (typeof styleName == "string") {
var styleValue = ko.utils.unwrapObservable(value[styleName]);
element.style[styleName] = styleValue || ""; // Empty string removes the value, whereas null/undefined have no effect
}
}
}
};
ko.bindingHandlers['uniqueName'] = {
'init': function (element, valueAccessor) {
if (valueAccessor()) {
element.name = "ko_unique_" + (++ko.bindingHandlers['uniqueName'].currentIndex);
// Workaround IE 6 issue - http://www.matts411.com/post/setting_the_name_attribute_in_ie_dom/
if (ko.utils.isIe6)
element.mergeAttributes(document.createElement("<input name='" + element.name + "'/>"), false);
}
}
};
ko.bindingHandlers['uniqueName'].currentIndex = 0;
ko.bindingHandlers['checked'] = {
'init': function (element, valueAccessor, allBindingsAccessor) {
var updateHandler = function() {
var valueToWrite;
if (element.type == "checkbox") {
valueToWrite = element.checked;
} else if ((element.type == "radio") && (element.checked)) {
valueToWrite = element.value;
} else {
return; // "checked" binding only responds to checkboxes and selected radio buttons
}
var modelValue = valueAccessor();
if ((element.type == "checkbox") && (ko.utils.unwrapObservable(modelValue) instanceof Array)) {
// For checkboxes bound to an array, we add/remove the checkbox value to that array
// This works for both observable and non-observable arrays
var existingEntryIndex = ko.utils.arrayIndexOf(ko.utils.unwrapObservable(modelValue), element.value);
if (element.checked && (existingEntryIndex < 0))
modelValue.push(element.value);
else if ((!element.checked) && (existingEntryIndex >= 0))
modelValue.splice(existingEntryIndex, 1);
} else if (ko.isWriteableObservable(modelValue)) {
if (modelValue() !== valueToWrite) { // Suppress repeated events when there's nothing new to notify (some browsers raise them)
modelValue(valueToWrite);
}
} else {
var allBindings = allBindingsAccessor();
if (allBindings['_ko_property_writers'] && allBindings['_ko_property_writers']['checked']) {
allBindings['_ko_property_writers']['checked'](valueToWrite);
}
}
};
ko.utils.registerEventHandler(element, "click", updateHandler);
// IE 6 won't allow radio buttons to be selected unless they have a name
if ((element.type == "radio") && !element.name)
ko.bindingHandlers['uniqueName']['init'](element, function() { return true });
},
'update': function (element, valueAccessor) {
var value = ko.utils.unwrapObservable(valueAccessor());
if (element.type == "checkbox") {
if (value instanceof Array) {
// When bound to an array, the checkbox being checked represents its value being present in that array
element.checked = ko.utils.arrayIndexOf(value, element.value) >= 0;
} else {
// When bound to anything other value (not an array), the checkbox being checked represents the value being trueish
element.checked = value;
}
// Workaround for IE 6 bug - it fails to apply checked state to dynamically-created checkboxes if you merely say "element.checked = true"
if (value && ko.utils.isIe6)
element.mergeAttributes(document.createElement("<input type='checkbox' checked='checked' />"), false);
} else if (element.type == "radio") {
element.checked = (element.value == value);
// Workaround for IE 6/7 bug - it fails to apply checked state to dynamically-created radio buttons if you merely say "element.checked = true"
if ((element.value == value) && (ko.utils.isIe6 || ko.utils.isIe7))
element.mergeAttributes(document.createElement("<input type='radio' checked='checked' />"), false);
}
}
};
ko.bindingHandlers['attr'] = {
'update': function(element, valueAccessor, allBindingsAccessor) {
var value = ko.utils.unwrapObservable(valueAccessor()) || {};
for (var attrName in value) {
if (typeof attrName == "string") {
var attrValue = ko.utils.unwrapObservable(value[attrName]);
// To cover cases like "attr: { checked:someProp }", we want to remove the attribute entirely
// when someProp is a "no value"-like value (strictly null, false, or undefined)
// (because the absence of the "checked" attr is how to mark an element as not checked, etc.)
if ((attrValue === false) || (attrValue === null) || (attrValue === undefined))
element.removeAttribute(attrName);
else
element.setAttribute(attrName, attrValue.toString());
}
}
}
};
ko.bindingHandlers['hasfocus'] = {
'init': function(element, valueAccessor, allBindingsAccessor) {
var writeValue = function(valueToWrite) {
var modelValue = valueAccessor();
if (valueToWrite == ko.utils.unwrapObservable(modelValue))
return;
if (ko.isWriteableObservable(modelValue))
modelValue(valueToWrite);
else {
var allBindings = allBindingsAccessor();
if (allBindings['_ko_property_writers'] && allBindings['_ko_property_writers']['hasfocus']) {
allBindings['_ko_property_writers']['hasfocus'](valueToWrite);
}
}
};
ko.utils.registerEventHandler(element, "focus", function() { writeValue(true) });
ko.utils.registerEventHandler(element, "focusin", function() { writeValue(true) }); // For IE
ko.utils.registerEventHandler(element, "blur", function() { writeValue(false) });
ko.utils.registerEventHandler(element, "focusout", function() { writeValue(false) }); // For IE
},
'update': function(element, valueAccessor) {
var value = ko.utils.unwrapObservable(valueAccessor());
value ? element.focus() : element.blur();
ko.utils.triggerEvent(element, value ? "focusin" : "focusout"); // For IE, which doesn't reliably fire "focus" or "blur" events synchronously
}
};
// "with: someExpression" is equivalent to "template: { if: someExpression, data: someExpression }"
ko.bindingHandlers['with'] = {
makeTemplateValueAccessor: function(valueAccessor) {
return function() { var value = valueAccessor(); return { 'if': value, 'data': value, 'templateEngine': ko.nativeTemplateEngine.instance } };
},
'init': function(element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
return ko.bindingHandlers['template']['init'](element, ko.bindingHandlers['with'].makeTemplateValueAccessor(valueAccessor));
},
'update': function(element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
return ko.bindingHandlers['template']['update'](element, ko.bindingHandlers['with'].makeTemplateValueAccessor(valueAccessor), allBindingsAccessor, viewModel, bindingContext);
}
};
ko.jsonExpressionRewriting.bindingRewriteValidators['with'] = false; // Can't rewrite control flow bindings
ko.virtualElements.allowedBindings['with'] = true;
// "if: someExpression" is equivalent to "template: { if: someExpression }"
ko.bindingHandlers['if'] = {
makeTemplateValueAccessor: function(valueAccessor) {
return function() { return { 'if': valueAccessor(), 'templateEngine': ko.nativeTemplateEngine.instance } };
},
'init': function(element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
return ko.bindingHandlers['template']['init'](element, ko.bindingHandlers['if'].makeTemplateValueAccessor(valueAccessor));
},
'update': function(element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
return ko.bindingHandlers['template']['update'](element, ko.bindingHandlers['if'].makeTemplateValueAccessor(valueAccessor), allBindingsAccessor, viewModel, bindingContext);
}
};
ko.jsonExpressionRewriting.bindingRewriteValidators['if'] = false; // Can't rewrite control flow bindings
ko.virtualElements.allowedBindings['if'] = true;
// "ifnot: someExpression" is equivalent to "template: { ifnot: someExpression }"
ko.bindingHandlers['ifnot'] = {
makeTemplateValueAccessor: function(valueAccessor) {
return function() { return { 'ifnot': valueAccessor(), 'templateEngine': ko.nativeTemplateEngine.instance } };
},
'init': function(element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
return ko.bindingHandlers['template']['init'](element, ko.bindingHandlers['ifnot'].makeTemplateValueAccessor(valueAccessor));
},
'update': function(element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
return ko.bindingHandlers['template']['update'](element, ko.bindingHandlers['ifnot'].makeTemplateValueAccessor(valueAccessor), allBindingsAccessor, viewModel, bindingContext);
}
};
ko.jsonExpressionRewriting.bindingRewriteValidators['ifnot'] = false; // Can't rewrite control flow bindings
ko.virtualElements.allowedBindings['ifnot'] = true;
// "foreach: someExpression" is equivalent to "template: { foreach: someExpression }"
// "foreach: { data: someExpression, afterAdd: myfn }" is equivalent to "template: { foreach: someExpression, afterAdd: myfn }"
ko.bindingHandlers['foreach'] = {
makeTemplateValueAccessor: function(valueAccessor) {
return function() {
var bindingValue = ko.utils.unwrapObservable(valueAccessor());
// If bindingValue is the array, just pass it on its own
if ((!bindingValue) || typeof bindingValue.length == "number")
return { 'foreach': bindingValue, 'templateEngine': ko.nativeTemplateEngine.instance };
// If bindingValue.data is the array, preserve all relevant options
return {
'foreach': bindingValue['data'],
'includeDestroyed': bindingValue['includeDestroyed'],
'afterAdd': bindingValue['afterAdd'],
'beforeRemove': bindingValue['beforeRemove'],
'afterRender': bindingValue['afterRender'],
'templateEngine': ko.nativeTemplateEngine.instance
};
};
},
'init': function(element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
return ko.bindingHandlers['template']['init'](element, ko.bindingHandlers['foreach'].makeTemplateValueAccessor(valueAccessor));
},
'update': function(element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
return ko.bindingHandlers['template']['update'](element, ko.bindingHandlers['foreach'].makeTemplateValueAccessor(valueAccessor), allBindingsAccessor, viewModel, bindingContext);
}
};
ko.jsonExpressionRewriting.bindingRewriteValidators['foreach'] = false; // Can't rewrite control flow bindings
ko.virtualElements.allowedBindings['foreach'] = true;// If you want to make a custom template engine,
//
// [1] Inherit from this class (like ko.nativeTemplateEngine does)
// [2] Override 'renderTemplateSource', supplying a function with this signature:
//
// function (templateSource, bindingContext, options) {
// // - templateSource.text() is the text of the template you should render
// // - bindingContext.$data is the data you should pass into the template
// // - you might also want to make bindingContext.$parent, bindingContext.$parents,
// // and bindingContext.$root available in the template too
// // - options gives you access to any other properties set on "data-bind: { template: options }"
// //
// // Return value: an array of DOM nodes
// }
//
// [3] Override 'createJavaScriptEvaluatorBlock', supplying a function with this signature:
//
// function (script) {
// // Return value: Whatever syntax means "Evaluate the JavaScript statement 'script' and output the result"
// // For example, the jquery.tmpl template engine converts 'someScript' to '${ someScript }'
// }
//
// This is only necessary if you want to allow data-bind attributes to reference arbitrary template variables.
// If you don't want to allow that, you can set the property 'allowTemplateRewriting' to false (like ko.nativeTemplateEngine does)
// and then you don't need to override 'createJavaScriptEvaluatorBlock'.
ko.templateEngine = function () { };
ko.templateEngine.prototype['renderTemplateSource'] = function (templateSource, bindingContext, options) {
throw "Override renderTemplateSource in your ko.templateEngine subclass";
};
ko.templateEngine.prototype['createJavaScriptEvaluatorBlock'] = function (script) {
throw "Override createJavaScriptEvaluatorBlock in your ko.templateEngine subclass";
};
ko.templateEngine.prototype['makeTemplateSource'] = function(template) {
// Named template
if (typeof template == "string") {
var elem = document.getElementById(template);
if (!elem)
throw new Error("Cannot find template with ID " + template);
return new ko.templateSources.domElement(elem);
} else if ((template.nodeType == 1) || (template.nodeType == 8)) {
// Anonymous template
return new ko.templateSources.anonymousTemplate(template);
} else
throw new Error("Unrecognised template type: " + template);
};
ko.templateEngine.prototype['renderTemplate'] = function (template, bindingContext, options) {
var templateSource = this['makeTemplateSource'](template);
return this['renderTemplateSource'](templateSource, bindingContext, options);
};
ko.templateEngine.prototype['isTemplateRewritten'] = function (template) {
// Skip rewriting if requested
if (this['allowTemplateRewriting'] === false)
return true;
// Perf optimisation - see below
if (this.knownRewrittenTemplates && this.knownRewrittenTemplates[template])
return true;
return this['makeTemplateSource'](template)['data']("isRewritten");
};
ko.templateEngine.prototype['rewriteTemplate'] = function (template, rewriterCallback) {
var templateSource = this['makeTemplateSource'](template);
var rewritten = rewriterCallback(templateSource['text']());
templateSource['text'](rewritten);
templateSource['data']("isRewritten", true);
// Perf optimisation - for named templates, track which ones have been rewritten so we can
// answer 'isTemplateRewritten' *without* having to use getElementById (which is slow on IE < 8)
if (typeof template == "string") {
this.knownRewrittenTemplates = this.knownRewrittenTemplates || {};
this.knownRewrittenTemplates[template] = true;
}
};
ko.exportSymbol('ko.templateEngine', ko.templateEngine);
ko.templateRewriting = (function () {
var memoizeDataBindingAttributeSyntaxRegex = /(<[a-z]+\d*(\s+(?!data-bind=)[a-z0-9\-]+(=(\"[^\"]*\"|\'[^\']*\'))?)*\s+)data-bind=(["'])([\s\S]*?)\5/gi;
var memoizeVirtualContainerBindingSyntaxRegex = /<!--\s*ko\b\s*([\s\S]*?)\s*-->/g;
function validateDataBindValuesForRewriting(keyValueArray) {
var allValidators = ko.jsonExpressionRewriting.bindingRewriteValidators;
for (var i = 0; i < keyValueArray.length; i++) {
var key = keyValueArray[i]['key'];
if (allValidators.hasOwnProperty(key)) {
var validator = allValidators[key];
if (typeof validator === "function") {
var possibleErrorMessage = validator(keyValueArray[i]['value']);
if (possibleErrorMessage)
throw new Error(possibleErrorMessage);
} else if (!validator) {
throw new Error("This template engine does not support the '" + key + "' binding within its templates");
}
}
}
}
function constructMemoizedTagReplacement(dataBindAttributeValue, tagToRetain, templateEngine) {
var dataBindKeyValueArray = ko.jsonExpressionRewriting.parseObjectLiteral(dataBindAttributeValue);
validateDataBindValuesForRewriting(dataBindKeyValueArray);
var rewrittenDataBindAttributeValue = ko.jsonExpressionRewriting.insertPropertyAccessorsIntoJson(dataBindKeyValueArray);
// For no obvious reason, Opera fails to evaluate rewrittenDataBindAttributeValue unless it's wrapped in an additional
// anonymous function, even though Opera's built-in debugger can evaluate it anyway. No other browser requires this
// extra indirection.
var applyBindingsToNextSiblingScript = "ko.templateRewriting.applyMemoizedBindingsToNextSibling(function() { \
return (function() { return { " + rewrittenDataBindAttributeValue + " } })() \
})";
return templateEngine['createJavaScriptEvaluatorBlock'](applyBindingsToNextSiblingScript) + tagToRetain;
}
return {
ensureTemplateIsRewritten: function (template, templateEngine) {
if (!templateEngine['isTemplateRewritten'](template))
templateEngine['rewriteTemplate'](template, function (htmlString) {
return ko.templateRewriting.memoizeBindingAttributeSyntax(htmlString, templateEngine);
});
},
memoizeBindingAttributeSyntax: function (htmlString, templateEngine) {
return htmlString.replace(memoizeDataBindingAttributeSyntaxRegex, function () {
return constructMemoizedTagReplacement(/* dataBindAttributeValue: */ arguments[6], /* tagToRetain: */ arguments[1], templateEngine);
}).replace(memoizeVirtualContainerBindingSyntaxRegex, function() {
return constructMemoizedTagReplacement(/* dataBindAttributeValue: */ arguments[1], /* tagToRetain: */ "<!-- ko -->", templateEngine);
});
},
applyMemoizedBindingsToNextSibling: function (bindings) {
return ko.memoization.memoize(function (domNode, bindingContext) {
if (domNode.nextSibling)
ko.applyBindingsToNode(domNode.nextSibling, bindings, bindingContext);
});
}
}
})();
ko.exportSymbol('ko.templateRewriting', ko.templateRewriting);
ko.exportSymbol('ko.templateRewriting.applyMemoizedBindingsToNextSibling', ko.templateRewriting.applyMemoizedBindingsToNextSibling); // Exported only because it has to be referenced by string lookup from within rewritten template
(function() {
// A template source represents a read/write way of accessing a template. This is to eliminate the need for template loading/saving
// logic to be duplicated in every template engine (and means they can all work with anonymous templates, etc.)
//
// Two are provided by default:
// 1. ko.templateSources.domElement - reads/writes the text content of an arbitrary DOM element
// 2. ko.templateSources.anonymousElement - uses ko.utils.domData to read/write text *associated* with the DOM element, but
// without reading/writing the actual element text content, since it will be overwritten
// with the rendered template output.
// You can implement your own template source if you want to fetch/store templates somewhere other than in DOM elements.
// Template sources need to have the following functions:
// text() - returns the template text from your storage location
// text(value) - writes the supplied template text to your storage location
// data(key) - reads values stored using data(key, value) - see below
// data(key, value) - associates "value" with this template and the key "key". Is used to store information like "isRewritten".
//
// Once you've implemented a templateSource, make your template engine use it by subclassing whatever template engine you were
// using and overriding "makeTemplateSource" to return an instance of your custom template source.
ko.templateSources = {};
// ---- ko.templateSources.domElement -----
ko.templateSources.domElement = function(element) {
this.domElement = element;
}
ko.templateSources.domElement.prototype['text'] = function(/* valueToWrite */) {
if (arguments.length == 0) {
return this.domElement.tagName.toLowerCase() == "script" ? this.domElement.text : this.domElement.innerHTML;
} else {
var valueToWrite = arguments[0];
if (this.domElement.tagName.toLowerCase() == "script")
this.domElement.text = valueToWrite;
else
this.domElement.innerHTML = valueToWrite;
}
};
ko.templateSources.domElement.prototype['data'] = function(key /*, valueToWrite */) {
if (arguments.length === 1) {
return ko.utils.domData.get(this.domElement, "templateSourceData_" + key);
} else {
ko.utils.domData.set(this.domElement, "templateSourceData_" + key, arguments[1]);
}
};
// ---- ko.templateSources.anonymousTemplate -----
var anonymousTemplatesDomDataKey = "__ko_anon_template__";
ko.templateSources.anonymousTemplate = function(element) {
this.domElement = element;
}
ko.templateSources.anonymousTemplate.prototype = new ko.templateSources.domElement();
ko.templateSources.anonymousTemplate.prototype['text'] = function(/* valueToWrite */) {
if (arguments.length == 0) {
return ko.utils.domData.get(this.domElement, anonymousTemplatesDomDataKey);
} else {
var valueToWrite = arguments[0];
ko.utils.domData.set(this.domElement, anonymousTemplatesDomDataKey, valueToWrite);
}
};
ko.exportSymbol('ko.templateSources', ko.templateSources);
ko.exportSymbol('ko.templateSources.domElement', ko.templateSources.domElement);
ko.exportSymbol('ko.templateSources.anonymousTemplate', ko.templateSources.anonymousTemplate);
})();
(function () {
var _templateEngine;
ko.setTemplateEngine = function (templateEngine) {
if ((templateEngine != undefined) && !(templateEngine instanceof ko.templateEngine))
throw "templateEngine must inherit from ko.templateEngine";
_templateEngine = templateEngine;
}
function invokeForEachNodeOrCommentInParent(nodeArray, parent, action) {
for (var i = 0; node = nodeArray[i]; i++) {
if (node.parentNode !== parent) // Skip anything that has been removed during binding
continue;
if ((node.nodeType === 1) || (node.nodeType === 8))
action(node);
}
}
ko.activateBindingsOnTemplateRenderedNodes = function(nodeArray, bindingContext) {
// To be used on any nodes that have been rendered by a template and have been inserted into some parent element.
// Safely iterates through nodeArray (being tolerant of any changes made to it during binding, e.g.,
// if a binding inserts siblings), and for each:
// (1) Does a regular "applyBindings" to associate bindingContext with this node and to activate any non-memoized bindings
// (2) Unmemoizes any memos in the DOM subtree (e.g., to activate bindings that had been memoized during template rewriting)
var nodeArrayClone = ko.utils.arrayPushAll([], nodeArray); // So we can tolerate insertions/deletions during binding
var commonParentElement = (nodeArray.length > 0) ? nodeArray[0].parentNode : null; // All items must be in the same parent, so this is OK
// Need to applyBindings *before* unmemoziation, because unmemoization might introduce extra nodes (that we don't want to re-bind)
// whereas a regular applyBindings won't introduce new memoized nodes
invokeForEachNodeOrCommentInParent(nodeArrayClone, commonParentElement, function(node) {
ko.applyBindings(bindingContext, node);
});
invokeForEachNodeOrCommentInParent(nodeArrayClone, commonParentElement, function(node) {
ko.memoization.unmemoizeDomNodeAndDescendants(node, [bindingContext]);
});
}
function getFirstNodeFromPossibleArray(nodeOrNodeArray) {
return nodeOrNodeArray.nodeType ? nodeOrNodeArray
: nodeOrNodeArray.length > 0 ? nodeOrNodeArray[0]
: null;
}
function executeTemplate(targetNodeOrNodeArray, renderMode, template, bindingContext, options) {
options = options || {};
var templateEngineToUse = (options['templateEngine'] || _templateEngine);
ko.templateRewriting.ensureTemplateIsRewritten(template, templateEngineToUse);
var renderedNodesArray = templateEngineToUse['renderTemplate'](template, bindingContext, options);
// Loosely check result is an array of DOM nodes
if ((typeof renderedNodesArray.length != "number") || (renderedNodesArray.length > 0 && typeof renderedNodesArray[0].nodeType != "number"))
throw "Template engine must return an array of DOM nodes";
var haveAddedNodesToParent = false;
switch (renderMode) {
case "replaceChildren":
ko.virtualElements.setDomNodeChildren(targetNodeOrNodeArray, renderedNodesArray);
haveAddedNodesToParent = true;
break;
case "replaceNode":
ko.utils.replaceDomNodes(targetNodeOrNodeArray, renderedNodesArray);
haveAddedNodesToParent = true;
break;
case "ignoreTargetNode": break;
default:
throw new Error("Unknown renderMode: " + renderMode);
}
if (haveAddedNodesToParent) {
ko.activateBindingsOnTemplateRenderedNodes(renderedNodesArray, bindingContext);
if (options['afterRender'])
options['afterRender'](renderedNodesArray, bindingContext['$data']);
}
return renderedNodesArray;
}
ko.renderTemplate = function (template, dataOrBindingContext, options, targetNodeOrNodeArray, renderMode) {
options = options || {};
if ((options['templateEngine'] || _templateEngine) == undefined)
throw "Set a template engine before calling renderTemplate";
renderMode = renderMode || "replaceChildren";
if (targetNodeOrNodeArray) {
var firstTargetNode = getFirstNodeFromPossibleArray(targetNodeOrNodeArray);
var whenToDispose = function () { return (!firstTargetNode) || !ko.utils.domNodeIsAttachedToDocument(firstTargetNode); }; // Passive disposal (on next evaluation)
var activelyDisposeWhenNodeIsRemoved = (firstTargetNode && renderMode == "replaceNode") ? firstTargetNode.parentNode : firstTargetNode;
return new ko.dependentObservable( // So the DOM is automatically updated when any dependency changes
function () {
// Ensure we've got a proper binding context to work with
var bindingContext = (dataOrBindingContext && (dataOrBindingContext instanceof ko.bindingContext))
? dataOrBindingContext
: new ko.bindingContext(ko.utils.unwrapObservable(dataOrBindingContext));
// Support selecting template as a function of the data being rendered
var templateName = typeof(template) == 'function' ? template(bindingContext['$data']) : template;
var renderedNodesArray = executeTemplate(targetNodeOrNodeArray, renderMode, templateName, bindingContext, options);
if (renderMode == "replaceNode") {
targetNodeOrNodeArray = renderedNodesArray;
firstTargetNode = getFirstNodeFromPossibleArray(targetNodeOrNodeArray);
}
},
null,
{ 'disposeWhen': whenToDispose, 'disposeWhenNodeIsRemoved': activelyDisposeWhenNodeIsRemoved }
);
} else {
// We don't yet have a DOM node to evaluate, so use a memo and render the template later when there is a DOM node
return ko.memoization.memoize(function (domNode) {
ko.renderTemplate(template, dataOrBindingContext, options, domNode, "replaceNode");
});
}
};
ko.renderTemplateForEach = function (template, arrayOrObservableArray, options, targetNode, parentBindingContext) {
var createInnerBindingContext = function(arrayValue) {
return parentBindingContext.createChildContext(ko.utils.unwrapObservable(arrayValue));
};
// This will be called whenever setDomNodeChildrenFromArrayMapping has added nodes to targetNode
var activateBindingsCallback = function(arrayValue, addedNodesArray) {
var bindingContext = createInnerBindingContext(arrayValue);
ko.activateBindingsOnTemplateRenderedNodes(addedNodesArray, bindingContext);
if (options['afterRender'])
options['afterRender'](addedNodesArray, bindingContext['$data']);
};
return new ko.dependentObservable(function () {
var unwrappedArray = ko.utils.unwrapObservable(arrayOrObservableArray) || [];
if (typeof unwrappedArray.length == "undefined") // Coerce single value into array
unwrappedArray = [unwrappedArray];
// Filter out any entries marked as destroyed
var filteredArray = ko.utils.arrayFilter(unwrappedArray, function(item) {
return options['includeDestroyed'] || !item['_destroy'];
});
ko.utils.setDomNodeChildrenFromArrayMapping(targetNode, filteredArray, function (arrayValue) {
// Support selecting template as a function of the data being rendered
var templateName = typeof(template) == 'function' ? template(arrayValue) : template;
return executeTemplate(null, "ignoreTargetNode", templateName, createInnerBindingContext(arrayValue), options);
}, options, activateBindingsCallback);
}, null, { 'disposeWhenNodeIsRemoved': targetNode });
};
var templateSubscriptionDomDataKey = '__ko__templateSubscriptionDomDataKey__';
function disposeOldSubscriptionAndStoreNewOne(element, newSubscription) {
var oldSubscription = ko.utils.domData.get(element, templateSubscriptionDomDataKey);
if (oldSubscription && (typeof(oldSubscription.dispose) == 'function'))
oldSubscription.dispose();
ko.utils.domData.set(element, templateSubscriptionDomDataKey, newSubscription);
}
ko.bindingHandlers['template'] = {
'init': function(element, valueAccessor) {
// Support anonymous templates
var bindingValue = ko.utils.unwrapObservable(valueAccessor());
if ((typeof bindingValue != "string") && (!bindingValue.name) && (element.nodeType == 1)) {
// It's an anonymous template - store the element contents, then clear the element
new ko.templateSources.anonymousTemplate(element).text(element.innerHTML);
ko.utils.emptyDomNode(element);
}
return { 'controlsDescendantBindings': true };
},
'update': function (element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
var bindingValue = ko.utils.unwrapObservable(valueAccessor());
var templateName;
var shouldDisplay = true;
if (typeof bindingValue == "string") {
templateName = bindingValue;
} else {
templateName = bindingValue.name;
// Support "if"/"ifnot" conditions
if ('if' in bindingValue)
shouldDisplay = shouldDisplay && ko.utils.unwrapObservable(bindingValue['if']);
if ('ifnot' in bindingValue)
shouldDisplay = shouldDisplay && !ko.utils.unwrapObservable(bindingValue['ifnot']);
}
var templateSubscription = null;
if (typeof bindingValue['foreach'] != "undefined") {
// Render once for each data point (treating data set as empty if shouldDisplay==false)
var dataArray = (shouldDisplay && bindingValue['foreach']) || [];
templateSubscription = ko.renderTemplateForEach(templateName || element, dataArray, /* options: */ bindingValue, element, bindingContext);
}
else {
if (shouldDisplay) {
// Render once for this single data point (or use the viewModel if no data was provided)
var innerBindingContext = (typeof bindingValue == 'object') && ('data' in bindingValue)
? bindingContext.createChildContext(ko.utils.unwrapObservable(bindingValue['data'])) // Given an explitit 'data' value, we create a child binding context for it
: bindingContext; // Given no explicit 'data' value, we retain the same binding context
templateSubscription = ko.renderTemplate(templateName || element, innerBindingContext, /* options: */ bindingValue, element);
} else
ko.virtualElements.emptyNode(element);
}
// It only makes sense to have a single template subscription per element (otherwise which one should have its output displayed?)
disposeOldSubscriptionAndStoreNewOne(element, templateSubscription);
}
};
// Anonymous templates can't be rewritten. Give a nice error message if you try to do it.
ko.jsonExpressionRewriting.bindingRewriteValidators['template'] = function(bindingValue) {
var parsedBindingValue = ko.jsonExpressionRewriting.parseObjectLiteral(bindingValue);
if ((parsedBindingValue.length == 1) && parsedBindingValue[0]['unknown'])
return null; // It looks like a string literal, not an object literal, so treat it as a named template (which is allowed for rewriting)
if (ko.jsonExpressionRewriting.keyValueArrayContainsKey(parsedBindingValue, "name"))
return null; // Named templates can be rewritten, so return "no error"
return "This template engine does not support anonymous templates nested within its templates";
};
ko.virtualElements.allowedBindings['template'] = true;
})();
ko.exportSymbol('ko.setTemplateEngine', ko.setTemplateEngine);
ko.exportSymbol('ko.renderTemplate', ko.renderTemplate);
(function () {
// Simple calculation based on Levenshtein distance.
function calculateEditDistanceMatrix(oldArray, newArray, maxAllowedDistance) {
var distances = [];
for (var i = 0; i <= newArray.length; i++)
distances[i] = [];
// Top row - transform old array into empty array via deletions
for (var i = 0, j = Math.min(oldArray.length, maxAllowedDistance); i <= j; i++)
distances[0][i] = i;
// Left row - transform empty array into new array via additions
for (var i = 1, j = Math.min(newArray.length, maxAllowedDistance); i <= j; i++) {
distances[i][0] = i;
}
// Fill out the body of the array
var oldIndex, oldIndexMax = oldArray.length, newIndex, newIndexMax = newArray.length;
var distanceViaAddition, distanceViaDeletion;
for (oldIndex = 1; oldIndex <= oldIndexMax; oldIndex++) {
var newIndexMinForRow = Math.max(1, oldIndex - maxAllowedDistance);
var newIndexMaxForRow = Math.min(newIndexMax, oldIndex + maxAllowedDistance);
for (newIndex = newIndexMinForRow; newIndex <= newIndexMaxForRow; newIndex++) {
if (oldArray[oldIndex - 1] === newArray[newIndex - 1])
distances[newIndex][oldIndex] = distances[newIndex - 1][oldIndex - 1];
else {
var northDistance = distances[newIndex - 1][oldIndex] === undefined ? Number.MAX_VALUE : distances[newIndex - 1][oldIndex] + 1;
var westDistance = distances[newIndex][oldIndex - 1] === undefined ? Number.MAX_VALUE : distances[newIndex][oldIndex - 1] + 1;
distances[newIndex][oldIndex] = Math.min(northDistance, westDistance);
}
}
}
return distances;
}
function findEditScriptFromEditDistanceMatrix(editDistanceMatrix, oldArray, newArray) {
var oldIndex = oldArray.length;
var newIndex = newArray.length;
var editScript = [];
var maxDistance = editDistanceMatrix[newIndex][oldIndex];
if (maxDistance === undefined)
return null; // maxAllowedDistance must be too small
while ((oldIndex > 0) || (newIndex > 0)) {
var me = editDistanceMatrix[newIndex][oldIndex];
var distanceViaAdd = (newIndex > 0) ? editDistanceMatrix[newIndex - 1][oldIndex] : maxDistance + 1;
var distanceViaDelete = (oldIndex > 0) ? editDistanceMatrix[newIndex][oldIndex - 1] : maxDistance + 1;
var distanceViaRetain = (newIndex > 0) && (oldIndex > 0) ? editDistanceMatrix[newIndex - 1][oldIndex - 1] : maxDistance + 1;
if ((distanceViaAdd === undefined) || (distanceViaAdd < me - 1)) distanceViaAdd = maxDistance + 1;
if ((distanceViaDelete === undefined) || (distanceViaDelete < me - 1)) distanceViaDelete = maxDistance + 1;
if (distanceViaRetain < me - 1) distanceViaRetain = maxDistance + 1;
if ((distanceViaAdd <= distanceViaDelete) && (distanceViaAdd < distanceViaRetain)) {
editScript.push({ status: "added", value: newArray[newIndex - 1] });
newIndex--;
} else if ((distanceViaDelete < distanceViaAdd) && (distanceViaDelete < distanceViaRetain)) {
editScript.push({ status: "deleted", value: oldArray[oldIndex - 1] });
oldIndex--;
} else {
editScript.push({ status: "retained", value: oldArray[oldIndex - 1] });
newIndex--;
oldIndex--;
}
}
return editScript.reverse();
}
ko.utils.compareArrays = function (oldArray, newArray, maxEditsToConsider) {
if (maxEditsToConsider === undefined) {
return ko.utils.compareArrays(oldArray, newArray, 1) // First consider likely case where there is at most one edit (very fast)
|| ko.utils.compareArrays(oldArray, newArray, 10) // If that fails, account for a fair number of changes while still being fast
|| ko.utils.compareArrays(oldArray, newArray, Number.MAX_VALUE); // Ultimately give the right answer, even though it may take a long time
} else {
oldArray = oldArray || [];
newArray = newArray || [];
var editDistanceMatrix = calculateEditDistanceMatrix(oldArray, newArray, maxEditsToConsider);
return findEditScriptFromEditDistanceMatrix(editDistanceMatrix, oldArray, newArray);
}
};
})();
ko.exportSymbol('ko.utils.compareArrays', ko.utils.compareArrays);
(function () {
// Objective:
// * Given an input array, a container DOM node, and a function from array elements to arrays of DOM nodes,
// map the array elements to arrays of DOM nodes, concatenate together all these arrays, and use them to populate the container DOM node
// * Next time we're given the same combination of things (with the array possibly having mutated), update the container DOM node
// so that its children is again the concatenation of the mappings of the array elements, but don't re-map any array elements that we
// previously mapped - retain those nodes, and just insert/delete other ones
// "callbackAfterAddingNodes" will be invoked after any "mapping"-generated nodes are inserted into the container node
// You can use this, for example, to activate bindings on those nodes.
function mapNodeAndRefreshWhenChanged(containerNode, mapping, valueToMap, callbackAfterAddingNodes) {
// Map this array value inside a dependentObservable so we re-map when any dependency changes
var mappedNodes = [];
var dependentObservable = ko.dependentObservable(function() {
var newMappedNodes = mapping(valueToMap) || [];
// On subsequent evaluations, just replace the previously-inserted DOM nodes
if (mappedNodes.length > 0) {
ko.utils.replaceDomNodes(mappedNodes, newMappedNodes);
if (callbackAfterAddingNodes)
callbackAfterAddingNodes(valueToMap, newMappedNodes);
}
// Replace the contents of the mappedNodes array, thereby updating the record
// of which nodes would be deleted if valueToMap was itself later removed
mappedNodes.splice(0, mappedNodes.length);
ko.utils.arrayPushAll(mappedNodes, newMappedNodes);
}, null, { 'disposeWhenNodeIsRemoved': containerNode, 'disposeWhen': function() { return (mappedNodes.length == 0) || !ko.utils.domNodeIsAttachedToDocument(mappedNodes[0]) } });
return { mappedNodes : mappedNodes, dependentObservable : dependentObservable };
}
var lastMappingResultDomDataKey = "setDomNodeChildrenFromArrayMapping_lastMappingResult";
ko.utils.setDomNodeChildrenFromArrayMapping = function (domNode, array, mapping, options, callbackAfterAddingNodes) {
// Compare the provided array against the previous one
array = array || [];
options = options || {};
var isFirstExecution = ko.utils.domData.get(domNode, lastMappingResultDomDataKey) === undefined;
var lastMappingResult = ko.utils.domData.get(domNode, lastMappingResultDomDataKey) || [];
var lastArray = ko.utils.arrayMap(lastMappingResult, function (x) { return x.arrayEntry; });
var editScript = ko.utils.compareArrays(lastArray, array);
// Build the new mapping result
var newMappingResult = [];
var lastMappingResultIndex = 0;
var nodesToDelete = [];
var nodesAdded = [];
var insertAfterNode = null;
for (var i = 0, j = editScript.length; i < j; i++) {
switch (editScript[i].status) {
case "retained":
// Just keep the information - don't touch the nodes
var dataToRetain = lastMappingResult[lastMappingResultIndex];
newMappingResult.push(dataToRetain);
if (dataToRetain.domNodes.length > 0)
insertAfterNode = dataToRetain.domNodes[dataToRetain.domNodes.length - 1];
lastMappingResultIndex++;
break;
case "deleted":
// Stop tracking changes to the mapping for these nodes
lastMappingResult[lastMappingResultIndex].dependentObservable.dispose();
// Queue these nodes for later removal
ko.utils.arrayForEach(lastMappingResult[lastMappingResultIndex].domNodes, function (node) {
nodesToDelete.push({
element: node,
index: i,
value: editScript[i].value
});
insertAfterNode = node;
});
lastMappingResultIndex++;
break;
case "added":
var valueToMap = editScript[i].value;
var mapData = mapNodeAndRefreshWhenChanged(domNode, mapping, valueToMap, callbackAfterAddingNodes);
var mappedNodes = mapData.mappedNodes;
// On the first evaluation, insert the nodes at the current insertion point
newMappingResult.push({ arrayEntry: editScript[i].value, domNodes: mappedNodes, dependentObservable: mapData.dependentObservable });
for (var nodeIndex = 0, nodeIndexMax = mappedNodes.length; nodeIndex < nodeIndexMax; nodeIndex++) {
var node = mappedNodes[nodeIndex];
nodesAdded.push({
element: node,
index: i,
value: editScript[i].value
});
if (insertAfterNode == null) {
// Insert "node" (the newly-created node) as domNode's first child
ko.virtualElements.prepend(domNode, node);
} else {
// Insert "node" into "domNode" immediately after "insertAfterNode"
ko.virtualElements.insertAfter(domNode, node, insertAfterNode);
}
insertAfterNode = node;
}
if (callbackAfterAddingNodes)
callbackAfterAddingNodes(valueToMap, mappedNodes);
break;
}
}
ko.utils.arrayForEach(nodesToDelete, function (node) { ko.cleanNode(node.element) });
var invokedBeforeRemoveCallback = false;
if (!isFirstExecution) {
if (options['afterAdd']) {
for (var i = 0; i < nodesAdded.length; i++)
options['afterAdd'](nodesAdded[i].element, nodesAdded[i].index, nodesAdded[i].value);
}
if (options['beforeRemove']) {
for (var i = 0; i < nodesToDelete.length; i++)
options['beforeRemove'](nodesToDelete[i].element, nodesToDelete[i].index, nodesToDelete[i].value);
invokedBeforeRemoveCallback = true;
}
}
if (!invokedBeforeRemoveCallback)
ko.utils.arrayForEach(nodesToDelete, function (node) {
ko.removeNode(node.element);
});
// Store a copy of the array items we just considered so we can difference it next time
ko.utils.domData.set(domNode, lastMappingResultDomDataKey, newMappingResult);
}
})();
ko.exportSymbol('ko.utils.setDomNodeChildrenFromArrayMapping', ko.utils.setDomNodeChildrenFromArrayMapping);
ko.nativeTemplateEngine = function () {
this['allowTemplateRewriting'] = false;
}
ko.nativeTemplateEngine.prototype = new ko.templateEngine();
ko.nativeTemplateEngine.prototype['renderTemplateSource'] = function (templateSource, bindingContext, options) {
var templateText = templateSource.text();
return ko.utils.parseHtmlFragment(templateText);
};
ko.nativeTemplateEngine.instance = new ko.nativeTemplateEngine();
ko.setTemplateEngine(ko.nativeTemplateEngine.instance);
ko.exportSymbol('ko.nativeTemplateEngine', ko.nativeTemplateEngine);(function() {
ko.jqueryTmplTemplateEngine = function () {
// Detect which version of jquery-tmpl you're using. Unfortunately jquery-tmpl
// doesn't expose a version number, so we have to infer it.
// Note that as of Knockout 1.3, we only support jQuery.tmpl 1.0.0pre and later,
// which KO internally refers to as version "2", so older versions are no longer detected.
var jQueryTmplVersion = this.jQueryTmplVersion = (function() {
if ((typeof(jQuery) == "undefined") || !(jQuery['tmpl']|| jQuery['render']))
return 0;
// Since it exposes no official version number, we use our own numbering system. To be updated as jquery-tmpl evolves.
try {
if (jQuery['render'])
return 3; // Current preview of jsRender
if (jQuery['tmpl']['tag']['tmpl']['open'].toString().indexOf('__') >= 0) {
// Since 1.0.0pre, custom tags should append markup to an array called "__"
return 2; // Final version of jquery.tmpl
}
} catch(ex) { /* Apparently not the version we were looking for */ }
return 1; // Any older version that we don't support
})();
function ensureHasReferencedJQueryTemplates() {
if (jQueryTmplVersion < 2)
throw new Error("Your version of jQuery.tmpl is too old. Please upgrade to jQuery.tmpl 1.0.0pre or later.");
}
function executeTemplate(compiledTemplate, data, jQueryTemplateOptions) {
if (jQueryTmplVersion < 3)
return jQuery['tmpl'](compiledTemplate, data, jQueryTemplateOptions);
var renderedHtml = jQuery['render'](compiledTemplate, data, jQueryTemplateOptions);
return jQuery(ko.utils.parseHtmlFragment(renderedHtml));
}
this['renderTemplateSource'] = function(templateSource, bindingContext, options) {
options = options || {};
ensureHasReferencedJQueryTemplates();
// Ensure we have stored a precompiled version of this template (don't want to reparse on every render)
var precompiled = templateSource['data']('precompiled');
if (!precompiled) {
var templateText = templateSource.text() || "";
// Wrap in "with($whatever.koBindingContext) { ... }"
var contextContainer = jQueryTmplVersion == 2 ? "$item" : "$ctx";
templateText = "{{ko_with " + contextContainer + ".koBindingContext}}" + templateText + "{{/ko_with}}";
precompiled = jQuery['template'](null, templateText);
templateSource['data']('precompiled', precompiled);
}
var data = [bindingContext['$data']]; // Prewrap the data in an array to stop jquery.tmpl from trying to unwrap any arrays
var jQueryTemplateOptions = jQuery['extend']({ 'koBindingContext': bindingContext }, options['templateOptions']);
var resultNodes = executeTemplate(precompiled, data, jQueryTemplateOptions);
resultNodes['appendTo'](document.createElement("div")); // Using "appendTo" forces jQuery/jQuery.tmpl to perform necessary cleanup work
jQuery['fragments'] = {}; // Clear jQuery's fragment cache to avoid a memory leak after a large number of template renders
return resultNodes;
};
this['createJavaScriptEvaluatorBlock'] = function(script) {
return "{{ko_code ((function() { return " + script + " })()) }}";
};
this['addTemplate'] = function(templateName, templateMarkup) {
document.write("<script type='text/html' id='" + templateName + "'>" + templateMarkup + "</script>");
};
if (jQueryTmplVersion >= 2) {
var tagContainer = jQueryTmplVersion == 2 ? "tmpl" : "tmplSettings";
jQuery[tagContainer]['tag']['ko_code'] = {
open: "__.push($1 || '');"
};
jQuery[tagContainer]['tag']['ko_with'] = {
open: "with($1) {",
close: "} "
};
}
};
ko.jqueryTmplTemplateEngine.prototype = new ko.templateEngine();
// Use this one by default *only if jquery.tmpl is referenced*
var jqueryTmplTemplateEngineInstance = new ko.jqueryTmplTemplateEngine();
if (jqueryTmplTemplateEngineInstance.jQueryTmplVersion > 0)
ko.setTemplateEngine(jqueryTmplTemplateEngineInstance);
ko.exportSymbol('ko.jqueryTmplTemplateEngine', ko.jqueryTmplTemplateEngine);
})();})(window);
Submit an article or tip