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• How expensive are variables in JavaScript?

  - by Tom

  How expensive are local variables (var v), global variables (window.v) and cross-global variables (parent.v) in JavaScript, in the major browsers? Has anyone performed any good tests on this one?

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• How to mix multiple javascript files into one?

  - by metal-gear-solid

  To reduce http request i want to mix multiple jquery plugin's javascript filesa and main jquery file into one. What things should be considered? Do we just need to place code from all files into new file one bye one or need to do something more. ?

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• Long task in Javascript / jQuery

  - by Misha Moroshko

  I have a long task in Javascript that should be performed before the web page content is displayed. During the execution of this task I would like to show an image whose opacity will grow up to 100% (when the task is done). How this can be achieved ?

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• JavaScript add to clipboard with additional text

  - by Kemo

  I know how to add to clipboard with JavaScript, but what I want now is TechCrunch clipboard trick; when someone copies some text ( ctrl+c, right click copy, clicking on a copy link on-site ), additional text is added to the clipboard ( like "this text was copied from ... ). I know they use Tynt, but don't really know is this a feature you get with it or custom coded?

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• Javascript and timing, specifically with callbacks.

  - by Blankman

  I want to make sure I understand callbacks properly, and javascript timing etc. in general. Say my code looks like this, is it gauranteed to execute in order? SetList(); // initilizes the var _list Some.Code(_list, function(data) { // update list }); DoSomething(_list); // operates on _list

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• local file access with javascript

  - by Jared

  is there any local file manipulation that's been done with javascript? i'm looking for a solution that can be accomplished with no install footprint like requiring AIR. specifically, i'd like to read the contents from a file and write those contents to another file. at this point i'm not worried about gaining permissions, just assuming i already have full permissions to these files.

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• Can JavaScript connect with MySQL?

  - by Anonymous the Great

  Can JavaScript connect with MySQL? If so, how? Easy rep! :D

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• JavaScript basic question

  - by refge

  I have this small JavaScript code which I need some help with: function doFocus(text) { if (text.value == "Enter Name") { text.value = "Student Name -"; } } All I need here is when someone clicks on my textbox, the text "Student Name -" should change its color, and should text-align = left. I am looking for the appropriate syntax for something like text.color and text.align.

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• How to validate username using Javascript?

  - by Dusk

  Hi, I want to know how can I validate using Javascript that if user has entered any username at the time of creating an account is already present in database and ask user to type any other username?

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• javascript source code reuse

  - by vbNewbie

  I am not familiar with javascript and I have had some exposure to java but I found a web application that fits the goals of my app perfectly. The owner has provided the source by viewing the source in the html and I was wondering how hard it would be to reuse the code to deploy a similar app.

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• javascript resize background image

  - by George

  Is it possible to resize a background image on load using javascript? I don't care about dynamically resizing the image according to window size or anything, I just want to take large images and resize them to a specific width and height so that the full image fits inside a specific layout.

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• Reduce multiple ORs in IF statement in Javascript

  - by misha-moroshko

  Hello, Is there a simpler way to rewrite the following condition in JavaScript ? Thanks ! if ((x == 1) || (x == 3) || (x == 4) || (x == 17) || (x == 80)) {...}

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• Is there a way in JavaScript which click an anchor

  - by michael

  Hi, Is there anyway in JavaScript which emulate user clicks an anchor? Mozilla(Firefox ) does not implement that. https://developer.mozilla.org/en/DOM/element.click But is there any browser which does?

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• JavaScript: create a string or char from an ASCII value

  - by Sakthivel

  In JavaScript, how can you get a string representation of an ASCII value. e.g. how to turn 65 into "A"?

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• Javascript debugging plugin for eclipse

  - by vineth

  I'm new to Java and I'm doing a project with Ext JS and Java. I'm using Eclipse Java EE IDE for Web Developers (Build id: 20100218-1602). Can anyone suggest any Javascript debugging plugin for this build? Links appreciated

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• Best javascript i18n techniques / AJAX - dates, times, numbers, currency

  - by John Vasileff

  For server side generated content, i18n support is usually pretty easy, for example, Java provides extensive i18n support. But, these rich server side libraries are not available within the browser, which causes a problem when trying to format data client side (AJAX style.) What javascript libraries and techniques are recommended for performing client side formatting and time-zone calculations? Also - beyond simple client side formatting, how can consistency be achieved when performing both server side and client side formatting?

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• javascript Image Resize

  - by chazzuka

  does anyone knows how to resize image proportionaly using javascript?, i have tried to modify the DOM adding attributes height & Width on the fly, but seems did not work on IE6

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• Javascript timezone solution needed

  - by user198729

  I have unix timestamps from time zone X which is not known, the current timestamp(now()) in TZ X is known 1275143019, how to approach a javascript function so that it can generate the datetime in the users current TZ in the format 2010-05-29 15:32:35 ?

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• Javascript UI Toolkit

  - by Louis

  I'm looking for a light-weight UI toolkit written in Javascript (something like Swing) but I'd rather not use ExtJS because I fear that will slow things down tremendously. Are there any small UI toolkits out there that mainly focus on layouts?

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• Javascript concatenate properties from multiple objects (associative array)

  - by Vlad

  I am looking for the best way to augment multiple javascript associative arrays. For example the following code a = { "one" : 1, "two" : 2 }; b = { "three" : 3 }; c = { "four" : 4, "five" : 5 }; d = Collect(a,b,c) Should result in value of d being: { "one" : 1, "two" : 2, "three" : 3, "four" : 4, "five" : 5 }; What is the best way to do this?

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• What javascript templating engine do you recommend?

  - by flybywire

  Do you have experience with a Javascript templating engine, one that is stable, easy to use and has good performance? I need to do apply the same template many times for different data. I prefer to download the template itself once (and have it cached) rather than processing the template on the server. Also, this way the template itself would be a static resource more easily cached in the server side too.

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• Javascript variables

  - by Uli

  I'm learning Javascript right now. Can anybody tell me why the second code block traces a empty path for -launch(this)- but using the first code block it gives me the right path? "<form action='"+launchwebsite+"/subsite/' method='post' target='_blank' onsubmit='launch(this)'>" and this not: "<a onclick='launch(this)' title='launch' class='iblack' /></a></div>" Best Uli

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• Looking for nice Javascript/jQuery code for displaying large tables

  - by misha-moroshko

  I have an HTML table which may contain thousands of rows (number of columns is not a problem here). I would like to be able to browse this table easily and be able to do the following: Decide how many rows will be presented Jump to the next/previous X number of rows Scroll the table using the scroll bars to any desired line Be able to customize/extend easily this Javascript/jQuery code Has anyone seen something similar ? Thank you very much !

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• Javascript update before page loads in ASP.NET

  - by user204588

  Hello, I'm trying to update values from a xml file into textboxes. I have this javascript being called in the Page_Load event this.Page.ClientScript.RegisterStartupScript(this.GetType(), "Script", sb.ToString(), true); I click the continue button which does a post back but the values are not updated until I refresh the page again which makes me think the js isn't being run until after the page is returned. I'm wondering how to have the values updated when the page is refreshed after the button postback. thanks

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• javascript setinterval function problem

  - by vakas

  i am using this code <a onclick="javascript:var t=setInterval("GetUpdates(5,ajaxResult)",300);">GetUpdates</a> but getting the syntax error

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