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• Documentation for JavaScript Event Hanlders.

  - by The Rook

  I am looking for a list of all JavaScript event handlers (such as onLoad, onSubmit ect...) and the corresponding html tags that they can be applied to. This is is the best document I have found so far, but I believe it is is incomplete. The W3 specs are even worse, all it says is "This attribute may be used with most elements.". All browsers have their own quarks, if you know of a document for a specific browser like Firefox or IE that would also be helpful.

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• [Javascript] Retrieve a URL of a frame

  - by Ricky

  Hi, guys: If I get a link <a href="/Users/ChangePassword.aspx" target="mainFrame"> in fraTopMenu, what (1) javascript can I add to get the current mainFrame's URL upon clicking the link and (2) append the URL to the querystrings? <frameset rows="60,*" cols="*" frameborder="no" border="0" framespacing="0"> <frame src="/Common/Manager/TopMenu.aspx" name="fraTopMenu" scrolling="no" noresize="noresize" id="fraTopMenu" title="" /> <frameset rows="*" cols="185,*" framespacing="0" frameborder="no" border="0"> <frame src="..." name="leftFrame" id="leftFrame" title="" /> <frame src="..." name="mainFrame" id="mainFrame" title="" /> </frameset> </frameset> Thank you.

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• Javascript running improperly?

  - by TruthStands

  I have a Javascript function that is called from the onchange method in a DropDownList. However I'm getting the error "Cannot have multiple items selected in a DropDownList." on line 14. This happens when the page is reloaded for other purposes. Why is it getting hung here when the method shouldn't even be getting called? Line 12: { Line 13: var hfSelected = document.getElementById("<%=hfSelectedValue.ClientID%>"); Line 14: var ddlExposure = document.getElementById("<%=ddlExposure.ClientID%>"); Line 15: hfSelected.value = ddlExposure.options[ddlExposure.selectedIndex].text + "|" + ddlExposure.options[ddlExposure.selectedIndex].value; Line 16: }

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• How to break closures in JavaScript

  - by Not a Name

  Is there any way to break a closure easily in JavaScript? The closest I have gotten is this: var src = 3; function foo () { return function () { return src; } } function bar (func) { var src = 9; return eval('('+func.toString()+')')(); // Line breaks closure } alert(bar(foo())); Which prints 9, instead of 3 as a closure would dictate. However, this approach seems kind of ugly to me, are there any better ways?

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• Making a select choice result in a popup in javascript

  - by Ryan Johsonson

  So this is using javascript and HTML. For example: <select name='test' > <option value='1'> <option value='2'> <option value='3'> </select> If someone chooses option value 2 (from the dropdown) I want a popup to appear. However if they choose option value 1 or option value 3 (from the dropdown) I want nothing to happen. How can I do this? Thanks

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• CouchDB: How to change view function via javascript?

  - by osti

  Hello Guys, I am playing around with CouchDB to test if it is "possible" [1] to store scientific data (simulated and experimental raw data + metadata). A big pro is the schema-less approach of CouchDB: we have to be very flexible with the metadata, as the set of parameters changes very often. Up to now I have some code to feed raw data, plots (both as attachments), and hierarchical metadata (as JSON) into CouchDB documents, and have written some prototype Javascript for filtering and showing. But the filtering is done on the client side (a.k.a. browser): The map function simply returns everything. How could I change the (or push a second) map function of a specific _design-document with simple browser-JS? I do not think that a temporary view would yield any performance gain... Thanks for your time and answers. [1]: of course it is possible, but is it also useful? feasible? reasonable?

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• Auto refresh of page in Rails 3 using javascript

  - by teknull

  I have a view in my rails app: blah.app/units/status This displays a status of all my units. I'd like to have the page automatically refresh via javascript but I'm not sure how to do it. I tried writing this but it doesn't reload: <script> $(function() { setInterval(function(){ $.getScript("/units/status"); }, 10000); }); </script> Can someone point out where I'm going wrong here?

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• Find and list all functions/methods in a set of JavaScript files

  - by Dan Milstein

  Is there a way to read a set of JavaScript files, and output a description of where every function/method is defined? I realize that this is likely impossible in full generality, due to the extreme dynamic nature of the language. What I'm imagining is something which gets the (relatively) straightforward cases. Ideally, I'd want it figure out where, e.g. some method got attached to string or hash or some other fundamental class (and also just let you find all the classes/functions that get defined once in one place). Does such a tool exist?

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• How to get option value (javascript)

  - by Mahmoud

  Below are the options that i have in my code <label id="subn"> <select name="subs" id="subs"> <option value="nothing">Choose a Subject</option> <option value="General Question">General Question</option> <option value="MemberShip Area">MemberShip Area</option> <option value="Others">Others</option> </select> </label> and i want to create a javascript that well check if the user select a subject other than the first below what i tried using if (document.getElementsByTagName('option') == "nothing"){ document.getElementById("subn").innerHTML = "Subject is Required!"; document.getElementById("subs").focus(); return false; }

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• Converting C# class to JavaScript

  - by AgileMeansDoAsLittleAsPossible

  Take a look at this basic class: namespace AcmeWeb { public string FirstName { get; set; } public class Person { public Person(string firstName, string lastName) { if (String.IsNullOrEmpty(firstName)) { throw new ArgumentNullException(firstName); } this.FirstName = firstName; } } } What's the best translation of this into JavaScript? This is what I'm thinking: (function(namespace) { namespace.Person = function(firstName, lastName) { // Constructor (function() { if (!firstName) { throw "'firstName' argument cannot be null or empty"; } })(); // Private memberts var _ = { firstName: firstName }; // Public members this.firstName = function(value) { if (typeof(value) === "undefined") { return _.firstName; } else { _.firstName = value; return this; } }; }; })(AcmeWeb);

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• JavaScript not changing display type or color in IE

  - by user445359

  I am trying to switch a series of blocks between "none" and "block" based on the OnMouseOver property and to change the title of the selected list to yellow at the same time. The JavaScript code I have for this is: function switchCat(cat) { var uls = document.getElementsByClassName('lower-ul'); var titles = document.getElementsByClassName('lower-cat-title'); for (var i=0;i<uls.length;i++) { uls[i].style.display = 'none'; titles[i].style.color = 'white'; } if (cat != -1) { var wanted = document.getElementById('lower-cat-'+cat); var wantedTitle = document.getElementById('lower-cat-title-'+cat); wanted.style.display = 'block'; wantedTitle.style.color = 'yellow'; } } It works with Chrome, Opera, and Firefox, however, it does not work with IE. When I test it in IE I get the error "Object doesn't support this property or method." Does anyone know what I am doing wrong?

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• "this" in JavaScript

  - by cf_PhillipSenn

  I'm trying to understand the syntax of how to put together a JavaScript function as an object. Q: Is this the right way to do it? The reason why I ask is because I'm looking at it in Firebug and I was hoping to be able to drill down and see the value of myVar and myVariable, but instead Firebug only says that "this" is an object Object. var myObject = { init: function() { var myVar = 1; myObject.myVariable = 2; console.log('"this" when called as an object: ' + this); } } myObject.init(); Also, what's the funny little syntax to call it directly upon declaration? Something about (), but when I remove the last line and put () at the end of the declaration, I get a syntax error.

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• Javascript jQuery .click() callback references local variable from the calling method instead of cop

  - by Eric Freese

  The following jQuery Javascript code is included on an otherwise empty page. $(function() { for (var i = 0; i < 10; i++) { element = $('<div>' + i + '</div>'); element.click(function() { alert(i); }); $('body').append(element); } }); The desired behavior is that this code should generate 10 div elements numbered from 0 to 9. When you click on a div element, an alert popup will show the number of the div element you clicked on (i.e. if a user clicks on the div element labeled '4', the alert popup should show the number 4). The alert popup instead shows the number 10 regardless of which div element is clicked on. How can I modify this code to make it behave in the desired way?

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• Detecting when Javascript is performing poorly

  - by what-the-crap

  I'm working on a webapp in jquery that, on older machines or machines without much resources, may perform poorly. To get around this I'd like to make a degraded version that disables some of the features, particularly those that rely on large images. How can I tell if my app is running poorly on the user's computer in jquery or javascript in general? I just need a way to call a function that will degrade the app. (especially when the user may run low on system memory) The only way I can think of is for manual user intervention, but the option would add clutter for users that don't need it and users that do need it may not notice it. Thanks!

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• JavaScript return method

  - by user1314034

  I'am new in javascript. I can't understand why the function returns T1 object (not just string 'hi') in the following example. function T1(){ return 'hi'; } function T(){ return new T1(); } T(); output: T1 And returns function in the following example function T1(){ return function(){ return 'hi'; } } function T(){ return new T1(); } T(); output: function (){ return 'hi' } Please explain this rethult. Thank you)

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• start javascript code with $(function, etc

  - by YAmikep

  I am studying Backbone and the todo example apps from http://todomvc.com/ I have noticed there are 3 severals ways of starting the code in the files: $(function() { // code here }); $(function( $ ) { // code here }); (function() { // code here }()); I do not understand the differences and when I should use one over the other. I also saw some people using this to start their code: $(document).ready(function(){ // code here }); From what I have seen, this is the full way of writing it right? In a more general way, should I always include my javascript code into something like that in each files? Thanks for your advice.

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• Programmatic gradient stops with Javascript

  - by TomcatExodus

  Working with Javascript (jQuery), given 2 color values (2033ff and 3300a0 for example) how can I determine certain gradient stops between them? Reason being is, I intend on using an array of color values: 0 => '000000' 8400 => 'f0ff00' 44000 => '2033ff' 68400 => '3300a0' There being 86400 seconds in a day, 12:00AM maps to 0, and 11:59PM maps to 86399. As time passes, the background color of a specified element changes to the appropriate color in gradient list via window.setInterval(function(e){ ... }, 1000). For example 2:32:11PM = 52331, which from the example would be somewhere between 2033ff and 3300a0. I don't need to populate the array with the values (unless that would be easier) but instead use the index and value as references.

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• JQuery or Javascript solution for selecting default value in drop down

  - by user1446843

  I have a calender list in a webpart page, this webpart page has a version number in it's title e.g. "WebPart 1.62". What I need to do is when a New item is created in the calender list on a webpart page, the New Item form has a dropdown menu 'SystemID' which gets it's values from the title column of a 'Systems' list, which is pre-populated with all versions of webpart forms. This dropdown menu 'SystemID' should select the version of the webpart page it is in as the default value. I need a JQuery solution for this, or even Javascript. I am finding it difficult as I am new to both JQuery and Sharepoint. I am using SP2007. I'll appreciate any guidance in solving this. At the moment the Create New Item form of the Calender list has the 'SystemID' drop down list pre-populated with the versions from the Systems list. If anyhthing is unclear pls let me know and I'll explain in more detail.

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• Javascript Image object without instantiating

  - by user276027

  This question is about javascript performance. Consider 3 examples for illustration: function loadImgA() { new Image().src="http://example.com/image.gif" } function loadImgA1() { Image().src="http://example.com/image.gif" } function loadImgB() { var testImg = new Image(); testImg.src="http://example.com/image.gif" } Now the point is I don't really need to manipulate the the image object after it was created, hence loadImgA(). The question is, what happens if nothing is assigned to the return value of the new Image() constructor - in that case I can actually skip the 'new' keyword as in loadImgA1()? Does the object then live outside the function or somehow affects memory usage? Other implications, differences? I reckon not, as no real instance was actually created? To put this into perspective, I only need to get the http request for image through. No preloading or other advanced image manipulation. What would be the preferred method from the above?

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• javascript popup image

  - by sam

  folks., i need to popup image on image hover?the image should be placed just above mouse pointer? i tried to implement event.x,event.y.. but it is not positoning well in all browsers..?is css need to be used here or please give me javascript code.. Code sample function Large(obj,id,e) { var imgbox=document.getElementById("imgbox"); // this is div tag,inside div i am placing imagebutton.. var imgbtn=document.getElementById('<%=ImageButton3.ClientID%>'); imgbox.style.visibility='visible'; imgbtn.src=obj; imgbox.style.left=event.x; imgbox.style.top= event.y; } thank you

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• PHP and Javascript cookies

  - by shummel7845

  Can I access a cookie written with jQuery's cookie plug-in with PHP? I know you can't set Javascript equal to PHP or vice versa, but IN ESSENCE is: $.cookie('var') = $_COOKIE['var']? Again, I know you can't set them equal to each other, but if I set it in jQuery and then go to another page, can PHP access it? I've read lots of posts about this, but I can't seem to find an answer to this part. Note, if I look in Firefox's preferences, I can see the cookies are there, so I know they're set.

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• Passing dynamic parameter to a JavaScript function using innerHTML

  - by user958263

  I am having issues passing a dynamic parameter to a JavaScript function using innerHTML. Included below is the current code that I am using: var name = "test"; frm.innerHtml = '<button name="close" id="close" title="Cancel" type="button" onclick="closeTab('+name+');">Return</button>'; When I debug the code of the CloseTab() function, the parameter specified by the name variable is null. I believe there is a problem with the declaration of the value while modifying the innerHTML property. Any help would be greatly appreciated. Thanks

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• Javascript Headscratcher

  - by Jason

  I have the following in a javascript file (using jQuery as well): $(function(){ $('#mybutton').live('click',myObject.someMethod); }); var myObject = { someMethod: function() { //do stuff } }; I get a js error on pageload that says "myObject isn't defined". However, when I change the event handler in the doc.ready function to: $('#mybutton').live('click', function(){ myObject.someMethod(); }); it works! I have code structured like the first example all over my codebase that works. W T F??

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• Accessing ajax POST response in javascript

  - by mike44

  I'm making ajax POST request from javascript function: function UpdateMetrics() { $.ajax({ type: "POST", url: "MyHandler.ashx?Param1=value1", data: "{}", contentType: "text/json; charset=utf-8", dataType: "text", success: function (msg) { var jsonUpdatedData = msg; ... } }); } From my handler, I'm sending json string with: context.Response.write(json); I think I'll get it in msg. I also want to send other string (count). So I'm trying to use header info along with json data. So I added this line: context.Response.Headers.Add("MaxCount",Convert.ToString(tempList.Count)); If this is right way to do it, how can I access it in my success function?

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• How to resubmit PHP form with javascript

  - by user866339

  I am wondering if it is possible to to resubmit a form with a button click that calls up a javascript command. So this is basically what I'm trying to do - page 1: form; action = page2.php page 2: generate a randomized list according to parameters set by page 1 I would like to place a button on page 2 so that on click, it would be as if the user has hit F5, and a new list would be generated with the same parameters. I found a lot of help on Google with people trying NOT to get this to happen, but I'm not sure how to actually get it to happen..... Thank you!

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