|
Try a Google search; you will find lots of information.
One of these days I'm going to think of a really clever signature.
|
|
|
|
|
|
I know that they are a rather good Dutch football team.
|
|
|
|
|
|
It's easy to crop,rotate,change colors of images.I want to use some senior image porcessing functions like DCT or FFT on HTML5 canvas? Is there any ready-made libs?
crop
<a href="http://www.webresourcesdepot.com/jquery-image-crop-plugin-jcrop">http://www.webresourcesdepot.com/jquery-image-crop-plugin-jcrop</a>[<a href="http://www.webresourcesdepot.com/jquery-image-crop-plugin-jcrop" target="_blank" title="New Window">^</a>]
rotate
<a href="http://code.google.com/p/jquery-rotate/">http://code.google.com/p/jquery-rotate/</a>[<a href="http://code.google.com/p/jquery-rotate/" target="_blank" title="New Window">^</a>]
change colors
<a href="http://github.com/mezzoblue/PaintbrushJS">http://github.com/mezzoblue/PaintbrushJS</a>[<a href="http://github.com/mezzoblue/PaintbrushJS" target="_blank" title="New Window">^</a>]
dct
<a href="http://en.wikipedia.org/wiki/Discrete_cosine_transform">http://en.wikipedia.org/wiki/Discrete_cosine_transform</a>[<a href="http://en.wikipedia.org/wiki/Discrete_cosine_transform" target="_blank" title="New Window">^</a>]
fft
<a href="http://en.wikipedia.org/wiki/Fft">http://en.wikipedia.org/wiki/Fft</a>[<a href="http://en.wikipedia.org/wiki/Fft" target="_blank" title="New Window">^</a>]
javascript dct fft
|
|
|
|
|
I'm toying around with objects for the first time, I'm kind of fuzzy about passing back an object to use in another function. It doesn't bomb, but my product object in load_Template is empty.
I looking for some clarity in understanding this.
function load_Template() {
var exitCode = 0;
$(document).ready(function () {
var product = new Object();
product = load_Structure_Product();
alert(product.ID);
});
return exitCode;
}
function load_Structure_Product() {
var product = new Object();
$(document).ready(function () {
product.ID = getParameterByName("cid");
if (product.ID != 33) {
product.PartNumber = "03-12E";
product.ManPartNumber = "03-12E";
});
return product;
}
|
|
|
|
|
Well of course it's empty, since you never assigned anything into it! You set up a document.ready handler which will later push some stuff into it, for some reason – since that function's already called inside a ready handler, I don't understand why you've done that. Just assign things directly into there!
function load_Structure_Product(){
var product = { ID: getParameterByName("cid") };
if(product.ID != 33) {
product.PartNumber = "03-12E";
product.ManPartNumber = "03-12E";
}
return product;
}
|
|
|
|
|
Thanks,
I was wondering it I had to initialize the object like a structure in c++
The 33 was a mistake, suppose to be != ""
Let me try it today
|
|
|
|
|
I am looking through JavaScript and searching the web to try to learn what it is doing. I see this as the first line of text. var RVIPath = RVIPath || {};
I know the || is a logical operator for OR. But the rest makes no sense to me.
|
|
|
|
|
I'm not sure what you're looking at. But what that does is assigns a new blank object ( {} ) to that variable if it didn't previously exist. (Actually, it also does it if that variable contains 0, false, an empty string, null or possibly an empty object or array, as well as undefined. But I'm sure its purpose is to ensure it is assigned to something before further processing.)
|
|
|
|
|
Thanks Bob.
But why the OR operand?
Here is the rest of the code:
// This function will open a new window with the URL of the Image requested.
OpenImageWindow = function (ImageViewer, RVIPath)
{
if (RVIPath != "XX") {
var hgt = screen.height - 20;
var wdt = screen.width * .5;
var lft = 1100;
var window_chrome = "toolbar=no,resizable=yes,height=" + hgt + ",width=" + wdt;
cas_window1 = window.open(RVIPath, "NewWindow", window_chrome);
cas_ window1.focus();
}
}
// This function will read thru a subfile and determine if the the Image field has a "Y" in it.
// If it does then it will set the field to " " and display the Scanner Images.
// If it does not then it sets the field to " " and leaves the URL blank.
DisplayScannerImage = function (elementsLength, imgCharField, imgImage, ScannerPath, startingID)
{
var startpoint = startingID;
var next = startpoint;
for (var i = 0; i < elementsLength; i++) {
var imgtext = document.getElementById(imgCharField + next);
var imgUrl = document.getElementById(imgImage + next);
if ($(imgtext).text() != 'Y') {
$(imgtext).text(' ');
$(imgUrl).hide();
}
if ($(imgtext).text() == 'Y') {
$(imgtext).text(' ');
$(imgUrl).attr('src', ScannerPath);
}
next = next + 1;
}
}
|
|
|
|
|
fellathedog wrote: But why the OR operand?
It's a shorthand way of saying:
if (RVIPath != NULL)
RVIPath = RVIPath;
else
RVIPath = new object;
if (RVIPath == NULL)
RVIPath = new object;
One of these days I'm going to think of a really clever signature.
|
|
|
|
|
We had a missionary from Japan Sunday at church that said "the Japaneese language was created by the devil", in reference to it being hard to learn. Coming from a very safe comfortable environment to the web sometimes makes me think the same about JavaScript. I will learn this and be looking back and laughing at this comment. Thanks.
|
|
|
|
|
fellathedog wrote: I will learn this and be looking back and laughing at this comment.
As we all do from time to time ... 
One of these days I'm going to think of a really clever signature.
|
|
|
|
|
I don't know where the NULL comes from there. It is shorthand for
if(!RVIPath) RVIPath = {};
If RVIPath is assigned, but set to something which evaluates to false, it will be reassigned.
|
|
|
|
|
Which is shorthand for
if(RVIPath == NULL) RVIPath = {};
The expression !object means object equals NULL.
if(!RVIPath)
if(!(RVIPath == NULL))
if(RVIPath != NULL)
One of these days I'm going to think of a really clever signature.
modified 23-Jul-12 13:48pm.
|
|
|
|
|
Javascript is loosely typed. There's no guarantee that RVIPath was of type 'object' before arriving at this statement, and there are various other values it could have which would evaluate to 'false'.
|
|
|
|
|
I was merely trying to explain syntax to OP, and I think my answer did that, and still holds true whether RVIPath is an object, a number or anything else.
One of these days I'm going to think of a really clever signature.
|
|
|
|
|
I've gotten in the habit of doing !object with javascript because it is the least like any other programming language. Getting into the details of == and === in javascript is just too much of a PITA.
|
|
|
|
|
I have been doing that for nearly 30 years since I first read Kernighan & Ritchie[^]. I don't find Javascript that different, syntactically, from C or Java.
One of these days I'm going to think of a really clever signature.
|
|
|
|
|
Funny, it must be one of my handicaps from learning C++ before C. I think the vogue at the time was to avoid shortcuts like that and avoid shortcuts like if (!x) for pointers.
Richard MacCutchan wrote: I don't find Javascript that different, syntactically, from C or Java.
Once I got into the details of it, the common syntax made things more complicated for me than if it was more foreign. When I read javascript now every time I see x != null instead of !x or x !== null, I immediately leap to the conclusion that the author is still thinking that everything works like C# and there are probably subtle bugs lurking in the code. Using the full on javascript style is a message to my future self that the code was written when I better understood the way javascript works.
|
|
|
|
|
This relies on the truthyness/falseyness concept in javascript, and the fact that as part of a boolean operation, javascript will coerce things to truthyness or falseyness.
Falsey values in javascript are 0, null, undefined
So what this code says is "If RVIPath is truthy, assign its value to RVIPath. Otherwise assign an empty object to RVIPath"
It is a shorthand equivalent of
var RVIPath = null;
if(RVIPath)
RVIPath = RVIPath;
else
RVIPath = {};
|
|
|
|
|
Hi all;
I have an ActiveX control that use it's functionality in a html file, so that I call it's methods and properties
using a javascript function as below:
<!DOCTYPE html>
<html>
<head>
<title></title>
<style type="text/css">
fieldset {
border-color: #000;
border-width: 3px;
border-style: solid;
padding: 10px;
margin: 0;
min-width: 400px;
max-width: 800px;
width: 800px;
}
fieldset legend {
color: blue
font-size: 1.1em;
}
fieldset label:first-letter {
text-decoration: underline;
}
input, textarea, select {
width: auto;
margin: 5px 0 0 10px;
}
.style1
{
width: 25%;
}
.style2
{
color: #0000CC;
font-weight: 700;
}
.style3
{
width: 213px;
}
</style>
<script type="text/javascript">
function OnGenReq()
{
var ret = MyOCX.GenerateReq(Text1.value, Text2.value, Text3.value, length1.value, Text4.value);
document.getElementById("demo").innerHTML=ret;
myreq.value = MyOCX.ReqString;
}
</script>
</head>
<body>
<p id="demo"></p>
<object id="MyOCX" width="0" height="0" codebase="C:\Users\Administrator\Documents\Activex.cab"
classid="clsid:8F91127E-A84B-4FBD-AB43-AA63A63C0BE5">
<param name="_Version" value="65536">
<param name="_ExtentX" value="2646">
<param name="_ExtentY" value="1323">
<param name="_StockProps" value="0">
</object>
<p></p>
<fieldset>
<legend class="style2">Generate Request:</legend>
<label for="Text1">First string Arg:</label><input id="Text1" type="text"><br>
<label for="Text2">Second string Arg:</label><input id="Text2" type="text"><br>
<label for="Text3">Third string Arg:</label><input id="Text3" type="text"><br>
<label for="length1">Length value:</label>
<select id="length1">
<option selected="selected" value="100">100</option>
<option value="200">200</option>
<option value="300">300</option>
</select><br>
<label for="Text4">Forth string Arg:</label><input id="Text4" size="30" type="text"><br><br>
<label for="gen"></label><input id="gen" value="Generate Request" type="button" onclick="try{OnGenReq()}catch(e)
{alert(e)}"><br><br>
<center>
<label for="myreq">Req String</label><br><textarea id="myreq" rows="15" cols="66"></textarea><br><br>
</center>
</fieldset>
</body>
</html>
As you see in the html code, I have a tag with "myreq" id that want to display "ReqString" value (that
is a custom property of the activex) into textarea.
When I click "Generate Request" button, "MyOCX.GenerateReq" method runs to assign a string value to "ReqString"
property. But when I assign "MyOCX.ReqString" value to "myreq" to be displayed in the textarea using either:
myreq.value = MyOCX.ReqString;
OR
document.getElementById("myreq").value = MyOCX.ReqString;
I get the error "ReferenceError:'myreq' is undefined", while "myreq" is defined within the <fieldset> tag!
Could you tell me what's wrong with this code?
TIA.
|
|
|
|
|
creative26 wrote: I get the error "ReferenceError:'myreq' is undefined", while "myreq" is defined within the tag!
No it is not defined.
myreg is not the same as "myreg", for the latter is a array of chars, because it is enclosed in doublequote marks.
You may do the following, but no guarantee that it will work, because I have no idea what your trying to accomplish
var myreg = MyOCX.ReqString;
|
|
|
|
|
He, he, he, ha.
SA will smile when/if he reads this.
Have you tried looking at the code in a syntax hi-lighting editor? Have a very close look at the HTML for your button.
Last time I checked, önclick is not a function. Get rid of that accented charater and replace it with an 'o'
That's right - your code was never getting called. Using the javascript debugger in your browser may have told you sooner that the onclick event wasn't firing. 
But I picked it up in Notepad++ since the word wasn't coloured red
önclick = "try{OnGenReq();}catch(e){alert(e);}"
onclick = "try{OnGenReq();}catch(e){alert(e);}"
|
|
|
|
General 
News 
Suggestion 
Question 
Bug 
Answer 
Joke 
Praise 
Rant 
Admin 
Submit an article or tip
