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  • Check if CSS Class exists in StyleSheet using javascript/jQuery

    - by Akhil Sekharan
    Is there a way to check if there is a class named 'some-class-name' in css? For example, I have: <style type="text/css"> .box { position: absolute; left: 150%; } </style> My intention is to randomly assign a class to a div on certain event: var classList = []; //Need to populate this array $('#updateClass').on('click', function() { $('#resultDiv').attr('class',classList[Math.floor((Math.random()*classList.length)+1)]); }); Is it possible to check by JS/jQuery whether a class named 'box' exists in the stylesheet? Thanks.

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  • Slight confusion of `this` in a JavaScript call back function

    - by thecoshman
    $.ajax({url: path_to_file, cache: false, success: function(html_result){ $("#window_" + this.id + "_cont_buffer").html(html_result);}) Now then. This function call is with in a function of a class. this.id is a property of said class. will this pass the function value of this.id into the string the anonymous function, or will it try to evaluate it when the function actually gets called, thus making no sense. If this is not going to work how I want it to, can you recommend how I achieve this.

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  • Javascript insert parameter inside string

    - by amemak
    Hi, I want to ask if there is a way to insert variable inside another string which is part of another statement. For example: function SomeFunction(field) { var someVariable = document.getElementById('<%=' + field + '.ClientID %'); } But I've got an error: Error 6 'string' does not contain a definition for 'ClientID' Thank you.

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  • Javascript: variable scope & the evils of globals

    - by Nick
    I'm trying to be good, I really am, but I can't see how to do it :) Any advice on how to not use a global here would be greatly appreciated. Let's call the global G. Function A Builds G by AJAX Function B Uses G Function C Calls B Called by numerous event handlers attached to DOM elements (type 1) Function D Calls B Called by numerous event handlers attached to DOM elements (type 2) I can't see how I can get around using a global here. The DOM elements (types 1 & 2) are created in other functions (E&F) which are unconnected with A. I don't want to add G to each event handler (because it's large and there's lots of these event handlers), and doing so would require the same kind of solution as I'm seeking here (i.e., getting G to E&F). The global G, BTW, is an array that is necessary to build other elements as they, in turn, are built by AJAX. I'm not convinced that a singleton is real solution, either. Thanks.

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  • Example from: "Javascript - The Good Parts"

    - by Matrym
    What "ugliness" does the following solve? There's something I'm not getting, and I'd appreciate help understanding what it is. For example, by augmenting Function.prototype, we can make a method available to all functions: Function.prototype.method = function (name, func) { this.prototype[name] = func; return this; }; By augmenting Function.prototype with a method method, we no longer have to type the name of the prototype property. That bit of ugliness can now be hidden.

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  • After .load() Reset Textbox with User Entered Value using JavaScript and jQuery

    - by Aaron Salazar
    My function below calls a partial view after a user enters a filter-by string into the text box '#DocId'. When the user is done typing, the partial view is displayed with filtered data. Since my textbox needs to be in the partial view, when user is done entering a filter-by string and is shown the filtered data, the textbox is reset and the user entered data is lost. How can I set the value of the textbox back to the user entered string after the partial view is displayed? I'm pretty sure I need to use .val() but I can't seem to get this to work. $(function() { $('#DocId').live('keyup', function() { clearTimeout($.data(this, 'timer')); var val = $(this).val(); var wait = setTimeout(function() { $('#tableContent').load('/CurReport/TableResults', { filter: val }, 500) }, 500); $(this).data('timer', wait); }); }); Thank you, Aaron

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  • Javascript how can I trigger an event that was prevented

    - by Mike Robinson
    In my app a user clicks a link to another page. I'd like to track that in Omniture with a custom event, so I've bound the omniture s.t() event to the click event. How can I make certain the event fires before the next page is requested? I've considered event.preventDefault() on the click event of the link, but I actually want the original event to occur, just not immediately.

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  • Auto-resize large images with JavaScript?

    - by Yegor
    I have an application that allows people to post images on each others profiles with bb code. Problem is, some post very large images, which cover other parts of the site when are viewed. How can I scale down images, client-side, so they are no bigger than x by y dimensions?

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  • JavaScript - question regarding data structure

    - by orokusaki
    I'm trying to calculate somebody's bowel health based on a points system. I can edit the data structure, or logic in any way. I'm just trying to write a function and data structure to handle this ability. Pseudo calculator function: // Bowel health calculator var points = 0; If age is from 30 and 34: points += 1 If age is from 35 and 40: points += 2 If daily BMs is from 1 and 3: points -= 1 If daily BMs is from 4 and 6: points -= 2 return points; Pseudo data structure: var points_map = { age: { '30-34': 1, '35-40': 2 }, dbm: { '1-3': -1, '4-6': -2 } }; I have a full spreadsheet of data like this, and I am trying to write a DRY version of code and a DRY version of this data (ie, probably not a string for the '30-34', etc) in order to handle this sort of thing without a humongous number of switch statements.

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  • using javascript replace() to match the last occurance of a string

    - by Dave
    I'm building an 'add new row' function for product variations, and I'm struggling with the regex required to match the form attribute keys. So, I'm basically cloning rows, then incrementing the keys, like this (coffeescript): newrow = oldrow.find('select, input, textarea').each -> this.name = this.name.replace(/\[(\d+)\]/, (str, p1) -> "[" + (parseInt(p1, 10) + 1) + "]" ) this.id = this.id.replace(/\_(\d+)\_/, (str, p1) -> "_" + (parseInt(p1, 10) + 1) + "_" ) .end() This correctly increments a field with a name of product[variations][1][name], turning it into product[variations][2][name] BUT Each variation can have multiple options (eg, color can be red, blue, green), so I need to be able turn this product[variations][1][options][2][name] into product[variations][1][options][3][name], leaving the variation key alone. What regex do I need to match only the last occurrence of a key (the options key)?

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  • IE problem with javascript

    - by Syom
    i have the following simple script <input class="input" type="text" name="password" style="color: #797272;" value= "<?php if ($_POST[password] != '') {echo '';} else {echo '????????';}?>" onclick="if (this.value === this.defaultValue) { this.value=''; this.style.color='black'; this.type='password'; }" /> it works fine, but in IE7 it doesn't change the input type. this.type='password'; doesn't work could you help me? thanks

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  • javascript watching for variable change via a timer

    - by DA
    I have a slide show where every 10 seconds the next image loads. Once an image loads, it waits 10 seconds (setTimeout) and then calls a function which fades it out, then calls the function again to fade in the next image. It repeats indefinitely. This works. However, at times, I'm going to want to over-ride this "function1 call - pause - function2 call - function1 call" loop outside of this function (for instance, I may click on a slide # and want to jump directly to that slide and cancel the current pause). One solution seems to be to set up a variable, allow other events to change that variable and then in my original function chain, check for any changes before continuing the loop. I have this set up: var ping = 500; var pausetime = 10000; for(i=0; i<=pausetime; i=i+ping){ setTimeout(function(){ console.log(gocheckthevariable()); console.log(i); pseudoIf('the variable is true AND the timer is done then...do the next thing') },i) } The idea is that I'd like to pause for 10 seconds. During this pause, every half second I'll check to see if this should be stopped. The above will write out to the console the following every half second: true 10000 true 10000 true 10000 etc... But what I want/need is this: true 0 true 500 true 1000 etc... The basic problem is that the for loop executes before each of the set timeouts. While I can check the value of the variable every half second, I can't match that against the current loop index. I'm sure this is a common issue, but I'm at a loss what I should actually be searching for.

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  • Javascript memory leak/ performance issue?

    - by Tom
    I just cannot for the life of me figure out this memory leak in Internet Explorer. insertTags simple takes string str and places each word within start and end tags for HTML (usually anchor tags). transliterate is for arabic numbers, and replaces normal numbers 0-9 with a &#..n; XML identity for their arabic counterparts. fragment = document.createDocumentFragment(); for (i = 0, e = response.verses.length; i < e; i++) { fragment.appendChild((function(){ p = document.createElement('p'); p.setAttribute('lang', (response.unicode) ? 'ar' : 'en'); p.innerHTML = ((response.unicode) ? (response.surah + ':' + (i+1)).transliterate() : response.surah + ':' + (i+1)) + ' ' + insertTags(response.verses[i], '<a href="#" onclick="window.popup(this);return false;" class="match">', '</a>'); try { return p } finally { p = null; } })()); } params[0].appendChild( fragment ); fragment = null; I would love some links other than MSDN and about.com, because neither of them have sufficiently explained to me why my script leaks memory. I am sure this is the problem, because without it everything runs fast (but nothing displays). I've read that doing a lot of DOM manipulations can be dangerous, but the for loops a max of 286 times (# of verses in surah 2, the longest surah in the Qur'an).

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  • Javascript - event listener toggle button

    - by user2546157
    I'm trying to create a button which can toggle "double click" to "single click" and in the opposite. For some reason, once it toggles to single click and it cannot toggle back. Can anyone please help! function init() { normal_listeners(); } function addListener(){ var image1 = document.getElementById('image_1'); var image2 = document.getElementById('image_2'); var image3 = document.getElementById('image_3'); if(document.getElementById('listener_1').value == "Listener"){ document.getElementById('listener_1').style.backgroundColor = "red"; alert("Normal"); image1.addEventListener("dblclick", function(){userChoice(1);}, false); image2.addEventListener("dblclick", function(){userChoice(2);}, false); image3.addEventListener("dblclick", function(){userChoice(3);}, false); document.getElementById('listener_1').value = "Normal"; } else if(document.getElementById('listener_1').value == "Normal") { document.getElementById('listener_1').style.backgroundColor = "green"; alert("Listener"); image1.addEventListener("click", function(){userChoice(1);}, false); image2.addEventListener("click", function(){userChoice(2);}, false); image3.addEventListener("click", function(){userChoice(3);}, false); document.getElementById('listener_1').value = "Listener"; } } function normal_listeners(){ var image1 = document.getElementById('image_1'); var image2 = document.getElementById('image_2'); var image3 = document.getElementById('image_3'); var listener1 = document.getElementById('listener_1'); listener1.addEventListener("click", addListener, false); image1.addEventListener("dblclick", function(){userChoice(1);}, false); image2.addEventListener("dblclick", function(){userChoice(2);}, false); image3.addEventListener("dblclick", function(){userChoice(3);}, false); } window.onload = init; <img id="image_1" src="rock.jpg" alt="ROCK" width="100" height="100"> <img id="image_2" src="paper.jpg" alt="PAPER" width="100" height="100"> <img id="image_3" src="scissors.jpg" alt="SCISSORS" width="100" height="100"> <input type="button" id="listener_1" value="Normal" style="background-color:red">

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  • Retrieving data from a JSON sub array in javascript, where identifier starts with an integer

    - by Archie Ec
    I must be missing something simple here, but I'm having trouble retrieving data from a JSON array response. I can access objects with identifiers that start with letters, but not ones that start with numbers. For example, I can access data.item[0].specs.overview.details But I can't access data.item[0].specs.9a99.details If anyone can point me in the right direction, I'd really appreciate it. Thanks.

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  • HTML/Javascript Strange behavior with input field and TABBING

    - by Berlin Brown
    I have a strange error where if a user enters in data, say first name and then tabs, the text in the field is highlighted/selected as opposed to moving to the next. So, a person may type the first name and then tab to the next input item, text is selected and then they hit a character and now the name they typed in is deleted. If I use the default [input] tags, the tab works properly. But in the code below, with keyup, that may change the tabbing behavior. How can I get my code where it won't select the text. This is replicated in Firefox and Internet Explorer. function enableSearch(lnameObj) { var goButtonObj = document.getElementById('goButton'); var nextButtonObj = document.getElementById('nextButton'); var lastName = lnameObj.value; if (lastName == "") { goButtonObj.disabled = true; } else { goButtonObj.disabled = false; } } <input type="text" size="12" name="lastname" onKeyUp="return enableSearch(this);" value="">

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  • javascript JSONP callback function not defined

    - by bitsMix
    ( function restoreURL() { function turnLongURL(data) { window.location = data.url; } var shortUrl = window.location.href; var url = "http://json-longurl.appspot.com/?url=" + shortUrl + "&callback=turnLongURL"; var script = document.createElement('script'); script.setAttribute('src', url); document.getElementsByTagName('head')[0].appendChild(script); })(); code is above, but the firebug told me, turnLongURL is not defined why is that?

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  • Loading and removing images with DOM, Javascript

    - by jesse
    I'm new to DOM and I'm having trouble removing multiple images that I loaded this loads 7 images (1.jpg, 2.jpg, etc..) function loadImages() { for (var i = 1; i < 8; i++ ) { var img = document.createElement("img"); img.src = "images/"+i+".jpg"; var idName = "img"+i+""; document.getElementById(idName).appendChild(img); } } this should remove all of them, but doesn't.. I think it breaks at the removeChild line. function removeImages() { for (var i = 1; i < 8; i++ ) { var idName = "img"+i+""; var d = document.getElementById(idName); d.removeChild(document.getElementById(img)); } } I think I'm doing something fundamentally wrong, because I don't fully understand how this works...

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  • javascript instanceof get type from string name

    - by dcp
    Let's say I have this (assume the name variable is "receiver"): if (!(receiver instanceof com.HTMLReceiver)) { throw new com.IllegalArgumentException( name + " is not an instance of com.HTMLReceiver."); } I'd like to factor this code out into a common method so I could call it like this: Helper.checkInstance(receiver, "com.HTMLReceiver"); But I don't know of a way to convert the com.HTMLReceiver from a string to its actual type so I can use instanceof on it. Is there a way?

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