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• javascript - document.activeElement

  - by Fernando SBS

  Hello, I have a few inputTextBoxes and I'm using document.activeElement to handle value changes of those inputboxes called by "change()" function of inputBox element. the problem is when I change the value of one of the inputboxes and then click in another inputbox... the function will get the document.activeElement of the new inputbox and will not work... how to make the function "know" that the one that changed was the previous one?

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• JavaScript: 'textarea.value' not working in IE?

  - by pete

  Hi! A few hours ago, I was instructed how to style a specific textarea with JS. The following piece of code (thanks again, Mario Menger) works like a charm in Firefox but unfortunately nothing happens in Internet Explorer (7 tested only so far). var foo = document.getElementById('HCB_textarea'); var defaultText = 'Your message here'; foo.value = defaultText; foo.style.color = '#888'; foo.onfocus = function(){ foo.style.color = '#000'; if ( foo.value == defaultText ) { foo.value = ''; } }; foo.onblur = function(){ foo.style.color = '#888'; if ( foo.value == '' ) { foo.value = defaultText; } }; I've already tried to replace 'value' by 'innerHTML' (for IE only) but to no effect. Any suggestions? TIA

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• Creating <li> with JavaScript in an XUL Application

  - by echox

  Hi! I try to create some li elements in my XUL Application. Theres only the text of the elements shown, but no list typical bullets and linebreaks. Example: text text text text text text text Heres the JS Code I use to create the list: var li = document.createElement('html:li'); var txt = document.createTextNode("only shown as simple text"); li.appendChild(txt); document.getElementById('someList').appendChild(li); HTML: <html:ul id="someList"> <html:li>this is shown in correct list style</html:li> </html:ul> I tried 'html:li' and also 'li' but nothing worked. Any suggestions?

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• Javascript regex hangs (using v8)

  - by Engwan

  Im using this regex to get the contents of a tag in a file. var regex = new RegExp("<tag:main>((?:.|\\s)*)</tag:main>"); This causes the v8 engine to hang indefinitely. Now, if I use new RegExp("<tag:main>([\s\S]*)</tag:main>"), all is good. Anyone have an idea why the first one takes too long?

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• clear javascript console in Google Chrome

  - by Reigel

  Hi, I was wondering if I could clear up the console with some command.. console.log(), can print... is there a command to clear up console?.. I've tried to console.log(console); and got this functions below... assert: function assert() { [native code] } constructor: function Console() { [native code] } count: function count() { [native code] } debug: function debug() { [native code] } dir: function dir() { [native code] } dirxml: function dirxml() { [native code] } error: function error() { [native code] } group: function group() { [native code] } groupEnd: function groupEnd() { [native code] } info: function info() { [native code] } log: function log() { [native code] } markTimeline: function markTimeline() { [native code] } profile: function profile() { [native code] } profileEnd: function profileEnd() { [native code] } time: function time() { [native code] } timeEnd: function timeEnd() { [native code] } trace: function trace() { [native code] } warn: function warn() { [native code] } __proto__: Object [ I guess there's no way to clear up the console... but I wanted someone to say it to me... ]

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• Django javascript escape characters

  - by Hulk

  There is a text area in which the data is entered as, 122 //Enter button pushed Address Name //Enter button pushed 1 And the same is tored in the db.And the data is fetched in views and returned it to template as, <script> {% for i in dict.row_arr %} var ii= ('{{ i }}'); row_arr.push( ii ); {% endfor %} </script> Here there is an error as Error: unterminated string literal Line: 40, Column: 12 Source Code: var ii= ('1212 And when the html source shows up as, var ii= ('1212 1 21 11212121212'); row_arr.push( ii ); How should the escape function be applied here. Thanks..

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• Return value from nested function in Javascript

  - by Chris Armstrong

  I have a function that is set up as follows function mainFunction() { function subFunction() { var str = "foo"; return str; } } var test = mainFunction(); alert(test); To my logic, that alert should return 'foo', but instead it returns undefined. What am I doing wrong?

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• determine if javascript blur/focusout event is from selecting flash or leaving browser

  - by jedierikb

  In IE when I select flash, document.onfocusout is fired. When this event is fired, I would like to distinguish between selecting flash and leaving the browser. When I handle the callback, document.activeElement is the previous html element with focus (what I just left), so this is not helpful for solving this problem. Clearly there has been a change in focus to warrant calling the blur method -- is this information available somewhere? Or is there a better way to do this?

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• Switch-Case for strings in Javascript not working as expected

  - by Coltin

  So I have this problem with strings and switch-case, and I'll try to keep it as simple as possible. Here event.keyCode has the value "65", and is the result of a keydown event of 'a' (using JQuery). if (event.keyCode == "65") { alert("hmmmm"); } That works, but: switch (event.keyCode) { case '65': alert("Yay!"); break; } That doesn't. However this will work: switch ('65') { case '65': alert("Yay!"); break; } And if I do this: var t = '65'; switch (t) { case '65': alert("Yay!"); break; } It works. And then I tried this: var t = event.keyCode; switch (t) { case '65': alert("Yay!"); break; } But it fails! So why does it match in the if-block at the beginning, but not for the switch-case?

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• For "draggable" div tags that are NOT nested: JQuery/JavaScript div tag “containment” approach/algor

  - by Pete Alvin

  Background: I've created an online circuit design application where .draggable() div tags are containers that contain smaller div containers and so forth. Question: For any particular div tag I need to quickly identify if it contains other div tags (that may in turn contain other div tags). -- Since the div tags are draggable, in the DOM they are NOT nested inside each other but I think are absolutely positioned. So I think that a "hit testing" approach is the only way to determine containment, unless there is some "secret" routine built-in somewhere that could help with this. I've searched JQuery and I don't see any built-in routine for this. Does anyone know of an algorithm that's quicker than O(n^2)? Seems like I have to walk the list of div tags in an outer loop (n) and have an inner loop (another n) to compare against all other div tags and do a "containment test" (position, width, height), building a list of contained div tags. That's n-squared. Then I have to build a list of all nested div tags by concatenating contained lists. So the total would be O(n^2)+n. There must be a better way?

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• 2 questions about drag and drop with Javascript

  - by David

  Hello, I'm trying to be able to drag random highlighted text or images on a random page that is not written by me, thus I cannot simply wrap the text in a div and make it draggable. Is there any way to get highlighted text or images on a random page, like say Yahoo, and drop it into a container that can recognize what was being dropped into it (like content and content-type) without it even being an explicitly declared draggable? I've been playing with jQuery, but can't figure it out. Any help would be greatly appreciated. Regards, David

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• Javascript image copy protection

  - by Chris

  Is there a way to protect your images from being copied, specifically their URL's. So that if someone were to try right click the image and copy the URL I could pop up an embed box, or perhaps specify my own particular copy code so that I dictate the terms of the copy? An alternate to this would be popping up a custom dialog box on right click with copy / embed options... How would one do this?

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• javascript date comparison

  - by ash34

  Hi, I haven't done much js. I am trying to compare two dates. From jconsole a = ["01/01/2010","01/02/2010","01/03/2010"] date1 = new Date('01/02/2010') Sat Jan 02 2010 00:00:00 GMT-0800 (PST) date2 = new Date(a[1]) Sat Jan 02 2010 00:00:00 GMT-0800 (PST) date1 == date2 false Can someone tell me why this does not match? thanks.

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• javascript regular expression search a pattern A(xyz).

  - by Paul

  I need to find all substrings from a string that starting with a given string following with a left bracket and then any legal literal and then the right bracket. For example, a string is abcd(xyz)efcd(opq), I want to a function that returns "cd(xyz)" and "cd(opq)". I wrote a regular expression, but it returns only cd( and cd(...

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• Javascript/JQuery: return immediately from PARENT function in call to each() via anon function

  - by GreenieMeanie

  For example: > function foo() { > jQuery(whatever).each( function() { return; // this just exits the anonymous function - is there a way to return from foo? } ); > > }

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• Javascript Uncaught Error: INDEX_SIZE_ERR: - Google Chrome - Canvas

  - by Gart

  I am drawing on a canvas with the following line: ctx.drawImage(compositeImage, 0, 0, image.width, image.height, i, j, scaledCompositeImageWidth, scaledCompositeImageHeight); This code has executed error free on Safari, Chrome, Firefox (and even IE using google's excanvas library). However, a recent update to Chrome now throws the following error: Uncaught Error: INDEX_SIZE_ERR: DOM Exception 1 This code often positions part or all of the drawn image OFF the canvas, anyone got any idea what's going on here?

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• Converting HTML to its safe entities with Javascript

  - by James P

  I'm trying to convert characters like < and > into &lt; and &gt; etc. User input is taken from a text box, and then copied into a DIV called changer. here's my code: function updateChanger() { var message = document.getElementById('like').value; message = convertHTML(message); document.getElementById('changer').innerHTML = message; } function convertHTML(input) { input = input.replace('<', '&lt;'); input = input.replace('>', '&gt;'); return input; } But it doesn't seem to replace >, only <. Also tried like this: input = input.replace('<', '&lt;').replace('>', '&gt;'); But I get the same result. Can anyone point out what I'm doing wrong here? Cheers.

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• javascript scroll event for iPhone/iPad ?

  - by _ck_

  I can't seem to capture the scroll event on an iPad. None of these work, what I am doing wrong? window.onscroll=myFunction; document.onscroll=myFunction; window.attachEvent("scroll",myFunction,false); document.attachEvent("scroll",myFunction,false); They all work even on Safari 3 on Windows. Ironically, EVERY browser on the PC supports window.onload= if you don't mind clobbering existing events. But no go on iPad.

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• JavaScript autocomplete upon typing

  - by James

  Right guys, all autocomplete plugins and functions that I've found, they only update upon keyup/down, etc. This is fine but the search only begins occurring once the user has stopped typing and if they are typing a phrase or word, the script is unable to instantly start suggesting, etc. I know this'll be a very simple fix or suggestion for some of you guys, so any help would be greatly appreciated as to how I can convert it to be instantly as a key is pressed. Thanks!

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• JavaScript: get the current executing <script> node?

  - by Martin

  Hi, I need to know if it is possible the current execution node? Example: ..html <script id="x"> console.log(document.currentNode.id); // << this must return "x" </script> ..html Thanks!

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• Swap CSS class on the basis of Scroll Position with Javascript

  - by Brian

  I'm looking to re-create the Apple Store shopping cart sidebar. http://store.apple.com/us/configure/MB535LL/A?mco=MTA4MTg3NTQ It is similar to "position: fixed" except that it starts out as "position: absolute" with the CSS class "pinned_top" and then switches to CSS class "floating" when a certain scroll-y position is reached. I've looked EVERYWHERE for this, it seems a tutorial should be obvious but I'm yet to find anything. Any help?

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• Javascript setters/getters

  - by Martin Hansen

  var author = { firstname: 'Martin', lastname: 'Hansen' } function settersGetters(propStr) { for (var i = 0; i < propStr.length; i++) { author['_'+ propStr[i]] = null; author.__defineGetter__(propStr[i], function() { return author['_'+ propStr[i]]; }); author.__defineSetter__(propStr[i], function(val) { author['_'+ propStr[i]] = val; }); }; } The above code would hopefully generate setters/getters for any supplied properties (in an array) for the object author. But when I call the below code Both firstname and lastname is olsen.. What am I doing wrong? settersGetters(['firstname', 'lastname']); author.firstname = 'per'; author.lastname = 'olsen'; console.log(author.firstname); console.log(author.lastname);

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• Execute JavaScript function on a dynamic element (AJAX).

  - by jartaud

  Hello i have this following function: ... var model = $("#carModel"); .... model.change(validModel); function validModel(){ if(model.val() == undefined){ model.addClass("errorJS"); return false; }else{ model.removeClass("errorJS"); return true; } } I am getting carmodel id from a select box generated after an AJAX call. I can get its value in the Firebug console, but the function doest not execute. Even tough i use model.livequery(validModel); // The errorJS class put a red border in a element, if the function returns false

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• javascript date and loop check

  - by StealthRT

  Hey all, this is the code i have to check for a day thats equal to the list of days in the comma seperated list: for(var i = 0; i < daysHidden.length; i++){ if (daysHidden[i] == d.getDate()); { alert(daysHidden[i] + '=' + d.getDate()); } } the daysHidden = 1 (its the only thing in the list April 1st is already gone and todays the 2nd so 1 is the only one in the list) and d.getDate() has 1-30 (for april) When i run the code, however, it keeps looping through the if code when it should only loop once (when it finds that 1=1 However, i keep getting the alert box that says: 1=1 1=2 1=3 etc.... 1=30 So i do not know what i am doing incorrect? I already tried putting them as strings: if (daysHidden[i].ToString == d.getDate().ToString); But that doesnt seem to work.... Any help would be great :) David

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• Javascript Square bracket notation for global variables

  - by Yousuf Haider

  I ran into an interesting issue the other day and was wondering if someone could shed light on why this is happening. Here is what I am doing (for the purposes of this example I have dumbed down the example somewhat): I am creating a globally scoped variable using the square bracket notation and assigning it a value. Later I declare a var with the same name as the one I just created above. Note I am not assigning a value. Since this is a redeclaration of the same variable the old value should not be overriden as described here: http://www.w3schools.com/js/js_variables.asp //create global variable with square bracket notation window['y'] = 'old'; //redeclaration of the same variable var y; if (!y) y = 'new'; alert(y); //shows New instead of Old The problem is that the old value actually does get overriden and in the above eg. the alert shows 'new' instead of 'old'. Why ? I guess another way to state my question is how is the above code different in terms of semantics from the code below: //create global variable var y = 'old'; //redeclaration of the same variable var y; if (!y) y = 'new'; alert(y); //shows New instead of Old

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