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  • Do I need to specify a return type for an anonymous function in javascript / typescript?

    - by Anne
    I have the following function: $('td:eq(' + iColumn + ') input', oSettings.oApi._fnGetTrNodes(oSettings)) .each(function () { aData.push(this.value); }); In typescript I am getting a message saying: Error 3 Function declared a non-void return type, but has no return expression Why am I getting this message? I can resolve the message by saying "return true". Should I always specify a return type for this?

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  • How to enable a linkbutton server control using javascript?

    - by satyaj
    I have a linkbutton server control in my page whose Enabled attribute is initially set to "false". When a text box's text changes I would like to enable the linkbutton. I tried the following but it does not work. Could you let me know if i am missing something. function TextBox_TextChanged() { var control = $get("<%= linkButtonSave.ClientID%>"); if(control != null) control.enabled = true; } Thanks

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  • How to pass a reference to a string in JavaScript?

    - by ijjo
    Maybe a closure is my solution? Not exactly sure how to pull it off though. The code is set up like so: var globalVar = ''; var globalVar2 = ''; function func() { if (condition) func2(globalVar) else func2(globalVar2) } In func2() I cache some HTML in a main container into the appropriate global variable that I pass to it. Basically I have a main container that holds different pages depending on what tab they choose. For performance I want to cache the page into global vars so I need to know what tab is active to figure out which global var to assign the HTML to.

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  • javascript for (i = 0; i < XXX.length; i++) -> length question

    - by Fernando SBS
    for (m = 0; m < troopsCount.length; m++) { //FM_log(7,"i="+i+" m="+m); //FM_log(7,"tipoTropaPrioritaria[m] = "+tipoTropaPrioritaria[m]); //FM_log(7,"troopsCount[m] = "+troopsCount[m]); //FM_log(7,"availableTroops[m] = "+availableTroops[m]); if ((tipoTropaPrioritaria[m] == null || tipoTropaPrioritaria[m] == "undefined") || (troopsCount[m] == null || troopsCount[m] == "undefined") || (availableTroops[m] == null || availableTroops[m] == "undefined")) return "alternaTropas(): ERRO - tipoTropaPrioritaria[m] || troopsCount[m] || availableTroops[m] null ou undefined"; if ((parseInt(tipoTropaPrioritaria[m]) != 0) && (parseInt(troopsCount[m]) != 0)) { naoServe = true; break; } else { if ((parseInt(availableTroops[m])) < (parseInt(troopsCount[m]))) { naoServe = true; break; } else if (m < troopsCount.length) { naoServe = true; } else { //means m >= troopsCount.length naoServe = false; } } } my question is: the last statement else { //means m >= troopsCount.length naoServe = false; } will it ever be evaluated since for (m = 0; m < troopsCount.length; m++) ???

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  • JavaScript Drag and Drop Grid With Elements of Different Sizes.

    - by Paul67
    I need to be able to drag and drop boxes of differing dimensions on the same grid. JQuery UI seems to offer 80% of what I'm after particularly the sortable grid the have on their demo page. The only problem is that this grid only works with boxes of identical dimensions. My requirement is to be able to have the same functionality but with boxes that are sized as multiples of the base unit. For example - let's say the standard box size is 300x300px I would also like the opportunity to show on the same grid a 300x600px and a 600x600px box. There's no requirement to display boxes that are not multiples of the dimensions of the smallest box size.

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  • How can I use a value of JSP in Javascript code?

    - by novellino
    Hello, I have a list of elements, each of them appeared in my page through jsp. So I have this: <div id="title"><%= list.get(ind).getTitle() %></div> When I display the elements, as this tag is in for loop, I get everything right. Now I what to place a button for deleting each of this elements. What I have done is: <input type="submit" name="submit" onclick="deleteNewsFunction();" id="submit_btn"/> In the deleteNewsFunction() I just want to print the data. <script> function deleteNewsFunction(){ var item = $('#title').val(); alert(item); } </script> The problem is that the title var gets always the first item even if I am clicking on the button of the second item. I was thinking that maybe a solution is to add the "list.get(ind).getTitle()" as a parameter in the function like deleteNewsFunction(<%=list.get(ind).getTitle()%) but then it did not work at all. Does anyone know how to help me? Thanks a lot!

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  • Any way to define getters for lazy variables in Javascript arrays?

    - by LLer
    I'm trying to add elements to an array that are lazy-evaluated. This means that the value for them will not be calculated or known until they are accessed. This is like a previous question I asked but for objects. What I ended up doing for objects was Object.prototype.lazy = function(var_name, value_function) { this.__defineGetter__(var_name, function() { var saved_value = value_function(); this.__defineGetter__(var_name, function() { return saved_value; }); return saved_value; }); } lazy('exampleField', function() { // the code that returns the value I want }); But I haven't figured out a way to do it for real Arrays. Arrays don't have setters like that. You could push a function to an array, but you'd have to call it as a function for it to return the object you really want. What I'm doing right now is I created an object that I treat as an array. Object.prototype.lazy_push = function(value_function) { if(!this.length) this.length = 0; this.lazy(this.length++, value_function); } So what I want to know is, is there a way to do this while still doing it on an array and not a fake array?

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  • How to add a cross-browser mouse wheel function to a div in javascript?

    - by Shaunwithanau
    I am trying to stop the default mouse wheel event that is called on the window and on a div and call my own function instead on the div. I need this to be cross-browser (without the use of a library. I know I need to use an eventListener and I think have to use both onmousewheel and DOMMouseScroll (for FF) but I think am getting caught up in the implementation somewhere. I appreciate any and all help.

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  • This javascript works in every browser EXCEPT for internet explorer!

    - by user309641
    The webpage is here: http://develop.macmee.com/testdev/ I'm talking about when you click the ? on the left, it is supposed to open up a box with more content in it. It does that in every browser except IE! function question() { $('.rulesMiddle').load('faq.php?faq=rules_main',function(){//load page into .rulesMiddle var rulesa = document.getElementById('rulesMiddle').innerHTML; var rules = rulesa.split('<div class="blockbody">');//split to chop off the top above rules var rulesT = rules[1].split('<form class="block');//split to chop off below rules rulesT[0] = rulesT[0].replace('class=','vbclass');//get rid of those nasty vbulletin defined classes document.getElementById('rulesMiddle').innerHTML = rulesT[0];//readd the content back into the DIV $('.rulesMain').slideToggle();//display the DIV $('.rulesMain').center();//center DIV $('.rulesMain').css('top','20px');//align with top }); }

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  • JavaScript: How can I determine what objects are being collected by the garbage collector?

    - by shino
    I have significant garbage collection pauses. I'd like to pinpoint the objects most responsible for this collection before I try to fix the problem. I've looked at the heap snapshot on Chrome, but (correct me if I am wrong) I cannot seem to find any indicator of what is being collected, only what is taking up the most memory. Is there a way to answer this empirically, or am I limited to educated guesses?

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  • HTML/Javascript: Is it possible to remember the filename from a fileupload field ONLY and then later

    - by Pieter Breed
    I have a HTML file upload field from which I'm reading the file name of the file that the user specifies. The actual contents of the file is never uploaded. At a later stage, is it possible to construct a link using this file name information so that if the user clicks on this link, the original file is launched into a new browser window? If not, what are the reason for disallowing this behaviour? The purpose of such a feature is to store links to documents that are available on a mapped local drive or a network share.

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  • is it possible to make one click fires two events or more by javascript?

    - by NewInAlbert
    I am currently making a temporary download page for website visitor. The page includes a form, after the visitor fills the form up, the site will take them to the pdf download page. In the download page, there are some pdf files download links (I am just using a tag.). However, i wanna make a onclick event to those links, once they have been clicked, the page will refresh automatically or redirect to other pages. <a href="/file.pdf" onClick="window.location.reload()">The File</a> I have tried the jquery way as well. <a href="/file.pdf" id="FileDownload">The File</a> <script> $("#FileDownload").click(function(){ location.reload(); }); </script> But all the them are not working. Do you masters have any good ideas about this, many thanks. P.S. What if I wanna add a countdown after a file is being started download, and then do page reload when countdown finishes. Looks like have asked several questions... Thanks a ton in advance.

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  • Can CoffeeScript Be Translated into This Piece of JavaScript?

    - by tangrui
    function abc() { var a = 1; var func = function() { var a = 2; } func(); alert(a); } Pay attention to the var, in the piece of code, the result of a will be 1, but if the var is omitted, the result will be 2, but I found Coffee not able to translate to this. For example the following: abc = -> a = 1 func = -> a = 2 return func() alert(a) return

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  • Best way to set a default button (or trigger its event in javascript) for an input field, not part of a form

    - by Sheldon Pinkman
    I've got a stand-alone input field, not part of any form. I also got a button, that has some onclick event. When I type something in the input field, and press the Enter key, I want it do effectively press the button, or trigger its onclick event. So that the button is "the input field's default button" so to speak. <input id='myText' type='text' /> <button id='myButton' onclick='DoSomething()'>Do it!</button> I guess I can mess around with the input field's onkeypress or onkeydown events and check for the Enter key, etc. But is there a more 'clean' way, I mean something that associated the button with that input field, so that the button is the 'default action' or something for that field? Note that I'm not inside a form, I am not sending, posting, or submitting something. The DoSomething() function just changes some of the HTML content locally, depending on the text input.

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  • Javascript match part of url, if statement based on result.

    - by nick
    Here is an example of the url i'm trying to match: http://store.mywebsite.com/folder-1/folder-2/item3423434.aspx What im trying to match is http: //store.mywebsite.com/folder-1 except that "folder-1" will always be a different value. I can't figure out how to write an if statement for this: Example (pseudo-code) if(url contains http://store.mywebsite.com/folder-1) do this else if (url contains http://store.mywebsite.com/folder-2) do something else etc

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  • How do I get the user info of a twitter user using javascript?

    - by user187809
    Using jquery's $.ajax function, I'm not able to parse the results. For example, I used it like this $.ajax({ url : "http://api.twitter.com/1/users/show.json?screen_name=techcrunch", dataType : "json", success : function(data) { // parse the JSON here }, error : function() { alert("Failure!"); }, }); This doesn't work. Do I need a callback function?

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  • Javascript looping only through defined properties of array. How?

    - by Beck
    For example if i'm keeping array of references via id like that: if(typeof channel_boards[misc.channel_id] == 'undefined') { channel_boards[misc.channel_id] = $('<div class="channel" channel_id="'+misc.channel_id+'"></div>').appendTo('#board'); } And then i'm looping through array to find required reference. I'm looping through undefined properties as well. Is it possible to loop only through defined properties? for(i=0;i<channel_boards.length;i++) { if(channel_boards[i] != undefined) { if(channel_boards[i].attr('channel_id') != visible) {channel_boards[i].addClass('hidden_board');} else {channel_boards[i].removeClass('hidden_board');} } } Maybe i should change the way i'm storing references? Via object for example, but how i'll be able to find proper reference via id number.

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  • Javascript: How to calculate the exact position of the viewport?

    - by batmanfu
    My problem is I need to get the position of the viewport relative to the extent of the entire document. I am only concerned with Firefox. My issue is that everything I have read says that: viewport height is window.innerHeight scroll position is window.pageYOffset document total height is document.height So, I would expect that if I scrolled to the bottom of a page that window.innerHeight + window.pageYOffset = document.height But it doesn't! Can someone please explain to me why this is?

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  • Is there a way to set a handler function for when a set of events has happened in JavaScript?

    - by allyourcode
    eg I have two concurrent AJAX requests, and I need the result from both to compute a third result. I'm using the Prototype library, so it might look something like this: var r1 = new Ajax.Request(url1, ...); var r2 = new Ajax.Request(url2, ...); function on_both_requests_complete(resp1, resp2) { ... } One way would be to use polling, but I'm thinking there must be a better way.

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  • What is the purpose of this string argument in a JavaScript function?

    - by Adel
    In the following function, there is the line: var username=getCookie("username"); Here's the whole function: function checkCookie() { var username=getCookie("username"); if (username!=null && username!="") { alert("Welcome again " + username); } else { username=prompt("Please enter your name:",""); if (username!=null && username!="") { setCookie("username",username,365); } } What is the point of the "username" argument being passed above? function getCookie(c_name) { var i,x,y,ARRcookies=document.cookie.split(";"); for (i=0;i<ARRcookies.length;i++) { x=ARRcookies[i].substr(0,ARRcookies[i].indexOf("=")); y=ARRcookies[i].substr(ARRcookies[i].indexOf("=")+1); x=x.replace(/^\s+|\s+$/g,""); if (x==c_name) { return unescape(y); } } } The whole code is here Thanks!

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  • Javascript E4X - Return the text of node and its children?

    - by Chris
    I'm trying to parse some of html where there is are repeating lines of code such as: <a>This is <span>some text</span> but its <span>not grabbing the span</span> content</a> So I am looping through the object and extracting this: object.a[i].text(); but its only returning "This is but its content" How do I grab the text within the children nodes as well, all as one string? Cheers

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  • How do i make a copy of an object? Javascript

    - by acidzombie24
    I have a class in json format. I would like to make two instance. Right now (its pretty obvious why) when i 'make' two objects i really have 2 vars pointing to one. (b.blah = 'z' will make a.blah=='z') How do i make a copy of an object? var template = { blah: 0, init: function (storageObj) { blah = storageObj; return this; //problem here }, func2: function (tagElement) { }, } a = template.init($('form [name=data]').eq(0)); b = template.init($('form [name=data2]').eq(0));

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