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MVC4 Mobile Friendly Web Applications

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13 Sep 2012CPOL9 min read 293.1K   9.1K   117  
Mobile enable your ASP.NET MVC4 Web applications
/*!
** Unobtrusive validation support library for jQuery and jQuery Validate
** Copyright (C) Microsoft Corporation. All rights reserved.
*/

/*jslint white: true, browser: true, onevar: true, undef: true, nomen: true, eqeqeq: true, plusplus: true, bitwise: true, regexp: true, newcap: true, immed: true, strict: false */
/*global document: false, jQuery: false */

(function ($) {
    var $jQval = $.validator,
        adapters,
        data_validation = "unobtrusiveValidation";

    function setValidationValues(options, ruleName, value) {
        options.rules[ruleName] = value;
        if (options.message) {
            options.messages[ruleName] = options.message;
        }
    }

    function splitAndTrim(value) {
        return value.replace(/^\s+|\s+$/g, "").split(/\s*,\s*/g);
    }

    function escapeAttributeValue(value) {
        // As mentioned on http://api.jquery.com/category/selectors/
        return value.replace(/([!"#$%&'()*+,./:;<=>?@\[\\\]^`{|}~])/g, "\\$1");
    }

    function getModelPrefix(fieldName) {
        return fieldName.substr(0, fieldName.lastIndexOf(".") + 1);
    }

    function appendModelPrefix(value, prefix) {
        if (value.indexOf("*.") === 0) {
            value = value.replace("*.", prefix);
        }
        return value;
    }

    function onError(error, inputElement) {  // 'this' is the form element
        var container = $(this).find("[data-valmsg-for='" + escapeAttributeValue(inputElement[0].name) + "']"),
            replace = $.parseJSON(container.attr("data-valmsg-replace")) !== false;

        container.removeClass("field-validation-valid").addClass("field-validation-error");
        error.data("unobtrusiveContainer", container);

        if (replace) {
            container.empty();
            error.removeClass("input-validation-error").appendTo(container);
        }
        else {
            error.hide();
        }
    }

    function onErrors(event, validator) {  // 'this' is the form element
        var container = $(this).find("[data-valmsg-summary=true]"),
            list = container.find("ul");

        if (list && list.length && validator.errorList.length) {
            list.empty();
            container.addClass("validation-summary-errors").removeClass("validation-summary-valid");

            $.each(validator.errorList, function () {
                $("<li />").html(this.message).appendTo(list);
            });
        }
    }

    function onSuccess(error) {  // 'this' is the form element
        var container = error.data("unobtrusiveContainer"),
            replace = $.parseJSON(container.attr("data-valmsg-replace"));

        if (container) {
            container.addClass("field-validation-valid").removeClass("field-validation-error");
            error.removeData("unobtrusiveContainer");

            if (replace) {
                container.empty();
            }
        }
    }

    function onReset(event) {  // 'this' is the form element
        var $form = $(this);
        $form.data("validator").resetForm();
        $form.find(".validation-summary-errors")
            .addClass("validation-summary-valid")
            .removeClass("validation-summary-errors");
        $form.find(".field-validation-error")
            .addClass("field-validation-valid")
            .removeClass("field-validation-error")
            .removeData("unobtrusiveContainer")
            .find(">*")  // If we were using valmsg-replace, get the underlying error
                .removeData("unobtrusiveContainer");
    }

    function validationInfo(form) {
        var $form = $(form),
            result = $form.data(data_validation),
            onResetProxy = $.proxy(onReset, form);

        if (!result) {
            result = {
                options: {  // options structure passed to jQuery Validate's validate() method
                    errorClass: "input-validation-error",
                    errorElement: "span",
                    errorPlacement: $.proxy(onError, form),
                    invalidHandler: $.proxy(onErrors, form),
                    messages: {},
                    rules: {},
                    success: $.proxy(onSuccess, form)
                },
                attachValidation: function () {
                    $form
                        .unbind("reset." + data_validation, onResetProxy)
                        .bind("reset." + data_validation, onResetProxy)
                        .validate(this.options);
                },
                validate: function () {  // a validation function that is called by unobtrusive Ajax
                    $form.validate();
                    return $form.valid();
                }
            };
            $form.data(data_validation, result);
        }

        return result;
    }

    $jQval.unobtrusive = {
        adapters: [],

        parseElement: function (element, skipAttach) {
            /// <summary>
            /// Parses a single HTML element for unobtrusive validation attributes.
            /// </summary>
            /// <param name="element" domElement="true">The HTML element to be parsed.</param>
            /// <param name="skipAttach" type="Boolean">[Optional] true to skip attaching the
            /// validation to the form. If parsing just this single element, you should specify true.
            /// If parsing several elements, you should specify false, and manually attach the validation
            /// to the form when you are finished. The default is false.</param>
            var $element = $(element),
                form = $element.parents("form")[0],
                valInfo, rules, messages;

            if (!form) {  // Cannot do client-side validation without a form
                return;
            }

            valInfo = validationInfo(form);
            valInfo.options.rules[element.name] = rules = {};
            valInfo.options.messages[element.name] = messages = {};

            $.each(this.adapters, function () {
                var prefix = "data-val-" + this.name,
                    message = $element.attr(prefix),
                    paramValues = {};

                if (message !== undefined) {  // Compare against undefined, because an empty message is legal (and falsy)
                    prefix += "-";

                    $.each(this.params, function () {
                        paramValues[this] = $element.attr(prefix + this);
                    });

                    this.adapt({
                        element: element,
                        form: form,
                        message: message,
                        params: paramValues,
                        rules: rules,
                        messages: messages
                    });
                }
            });

            $.extend(rules, { "__dummy__": true });

            if (!skipAttach) {
                valInfo.attachValidation();
            }
        },

        parse: function (selector) {
            /// <summary>
            /// Parses all the HTML elements in the specified selector. It looks for input elements decorated
            /// with the [data-val=true] attribute value and enables validation according to the data-val-*
            /// attribute values.
            /// </summary>
            /// <param name="selector" type="String">Any valid jQuery selector.</param>
            var $forms = $(selector)
                .parents("form")
                .andSelf()
                .add($(selector).find("form"))
                .filter("form");

            $(selector).find(":input[data-val=true]").each(function () {
                $jQval.unobtrusive.parseElement(this, true);
            });

            $forms.each(function () {
                var info = validationInfo(this);
                if (info) {
                    info.attachValidation();
                }
            });
        }
    };

    adapters = $jQval.unobtrusive.adapters;

    adapters.add = function (adapterName, params, fn) {
        /// <summary>Adds a new adapter to convert unobtrusive HTML into a jQuery Validate validation.</summary>
        /// <param name="adapterName" type="String">The name of the adapter to be added. This matches the name used
        /// in the data-val-nnnn HTML attribute (where nnnn is the adapter name).</param>
        /// <param name="params" type="Array" optional="true">[Optional] An array of parameter names (strings) that will
        /// be extracted from the data-val-nnnn-mmmm HTML attributes (where nnnn is the adapter name, and
        /// mmmm is the parameter name).</param>
        /// <param name="fn" type="Function">The function to call, which adapts the values from the HTML
        /// attributes into jQuery Validate rules and/or messages.</param>
        /// <returns type="jQuery.validator.unobtrusive.adapters" />
        if (!fn) {  // Called with no params, just a function
            fn = params;
            params = [];
        }
        this.push({ name: adapterName, params: params, adapt: fn });
        return this;
    };

    adapters.addBool = function (adapterName, ruleName) {
        /// <summary>Adds a new adapter to convert unobtrusive HTML into a jQuery Validate validation, where
        /// the jQuery Validate validation rule has no parameter values.</summary>
        /// <param name="adapterName" type="String">The name of the adapter to be added. This matches the name used
        /// in the data-val-nnnn HTML attribute (where nnnn is the adapter name).</param>
        /// <param name="ruleName" type="String" optional="true">[Optional] The name of the jQuery Validate rule. If not provided, the value
        /// of adapterName will be used instead.</param>
        /// <returns type="jQuery.validator.unobtrusive.adapters" />
        return this.add(adapterName, function (options) {
            setValidationValues(options, ruleName || adapterName, true);
        });
    };

    adapters.addMinMax = function (adapterName, minRuleName, maxRuleName, minMaxRuleName, minAttribute, maxAttribute) {
        /// <summary>Adds a new adapter to convert unobtrusive HTML into a jQuery Validate validation, where
        /// the jQuery Validate validation has three potential rules (one for min-only, one for max-only, and
        /// one for min-and-max). The HTML parameters are expected to be named -min and -max.</summary>
        /// <param name="adapterName" type="String">The name of the adapter to be added. This matches the name used
        /// in the data-val-nnnn HTML attribute (where nnnn is the adapter name).</param>
        /// <param name="minRuleName" type="String">The name of the jQuery Validate rule to be used when you only
        /// have a minimum value.</param>
        /// <param name="maxRuleName" type="String">The name of the jQuery Validate rule to be used when you only
        /// have a maximum value.</param>
        /// <param name="minMaxRuleName" type="String">The name of the jQuery Validate rule to be used when you
        /// have both a minimum and maximum value.</param>
        /// <param name="minAttribute" type="String" optional="true">[Optional] The name of the HTML attribute that
        /// contains the minimum value. The default is "min".</param>
        /// <param name="maxAttribute" type="String" optional="true">[Optional] The name of the HTML attribute that
        /// contains the maximum value. The default is "max".</param>
        /// <returns type="jQuery.validator.unobtrusive.adapters" />
        return this.add(adapterName, [minAttribute || "min", maxAttribute || "max"], function (options) {
            var min = options.params.min,
                max = options.params.max;

            if (min && max) {
                setValidationValues(options, minMaxRuleName, [min, max]);
            }
            else if (min) {
                setValidationValues(options, minRuleName, min);
            }
            else if (max) {
                setValidationValues(options, maxRuleName, max);
            }
        });
    };

    adapters.addSingleVal = function (adapterName, attribute, ruleName) {
        /// <summary>Adds a new adapter to convert unobtrusive HTML into a jQuery Validate validation, where
        /// the jQuery Validate validation rule has a single value.</summary>
        /// <param name="adapterName" type="String">The name of the adapter to be added. This matches the name used
        /// in the data-val-nnnn HTML attribute(where nnnn is the adapter name).</param>
        /// <param name="attribute" type="String">[Optional] The name of the HTML attribute that contains the value.
        /// The default is "val".</param>
        /// <param name="ruleName" type="String" optional="true">[Optional] The name of the jQuery Validate rule. If not provided, the value
        /// of adapterName will be used instead.</param>
        /// <returns type="jQuery.validator.unobtrusive.adapters" />
        return this.add(adapterName, [attribute || "val"], function (options) {
            setValidationValues(options, ruleName || adapterName, options.params[attribute]);
        });
    };

    $jQval.addMethod("__dummy__", function (value, element, params) {
        return true;
    });

    $jQval.addMethod("regex", function (value, element, params) {
        var match;
        if (this.optional(element)) {
            return true;
        }

        match = new RegExp(params).exec(value);
        return (match && (match.index === 0) && (match[0].length === value.length));
    });

    $jQval.addMethod("nonalphamin", function (value, element, nonalphamin) {
        var match;
        if (nonalphamin) {
            match = value.match(/\W/g);
            match = match && match.length >= nonalphamin;
        }
        return match;
    });

    adapters.addSingleVal("accept", "exts").addSingleVal("regex", "pattern");
    adapters.addBool("creditcard").addBool("date").addBool("digits").addBool("email").addBool("number").addBool("url");
    adapters.addMinMax("length", "minlength", "maxlength", "rangelength").addMinMax("range", "min", "max", "range");
    adapters.add("equalto", ["other"], function (options) {
        var prefix = getModelPrefix(options.element.name),
            other = options.params.other,
            fullOtherName = appendModelPrefix(other, prefix),
            element = $(options.form).find(":input[name='" + escapeAttributeValue(fullOtherName) + "']")[0];

        setValidationValues(options, "equalTo", element);
    });
    adapters.add("required", function (options) {
        // jQuery Validate equates "required" with "mandatory" for checkbox elements
        if (options.element.tagName.toUpperCase() !== "INPUT" || options.element.type.toUpperCase() !== "CHECKBOX") {
            setValidationValues(options, "required", true);
        }
    });
    adapters.add("remote", ["url", "type", "additionalfields"], function (options) {
        var value = {
            url: options.params.url,
            type: options.params.type || "GET",
            data: {}
        },
            prefix = getModelPrefix(options.element.name);

        $.each(splitAndTrim(options.params.additionalfields || options.element.name), function (i, fieldName) {
            var paramName = appendModelPrefix(fieldName, prefix);
            value.data[paramName] = function () {
                return $(options.form).find(":input[name='" + escapeAttributeValue(paramName) + "']").val();
            };
        });

        setValidationValues(options, "remote", value);
    });
    adapters.add("password", ["min", "nonalphamin", "regex"], function (options) {
        if (options.params.min) {
            setValidationValues(options, "minlength", options.params.min);
        }
        if (options.params.nonalphamin) {
            setValidationValues(options, "nonalphamin", options.params.nonalphamin);
        }
        if (options.params.regex) {
            setValidationValues(options, "regex", options.params.regex);
        }
    });

    $(function () {
        $jQval.unobtrusive.parse(document);
    });
} (jQuery));

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License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


Written By
Architect AssemblySoft
United Kingdom United Kingdom
Carl Randall is the founder of AssemblySoft.com where he offers freelancing services. He has specialized in Information Technology solutions for over 20 years. Specializing in full life-cycle development projects for both enterprise-wide systems, desktop applications and Internet based solutions. Carl is a Microsoft Cloud expert.

Carl has been involved in .Net since it's inception and is currently a Microsoft Certified Professional Developer (Enterprise).

You can read a little more from Carl from his personal blog: https://www.carlrandall.net/ which covers Azure, Blazor and .Net topics.

When not coding and designing, Carl enjoys playing table tennis, tennis, sailing and spending time by the beach - when the british weather permits Wink | ;)

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