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• Validate email address in Javascript?

  - by pix0r

  What's the best way to validate an email address in Javascript? Though this solution may be simple, I'm sure this is one of those useful things that people will be Googling for and deserves its own entry on the site

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• Why JavaScript Statement "ga = ga || []" Works?

  - by Morgan Cheng

  Below javascript statements will cause error, if ga is not declared. if (ga) { alert(ga); } The error is: ga is not defined It looks undeclared variable cannot be recognized in bool expression. So, why below statement works? var ga = ga || []; To me, the ga is treated as bool value before "||". If it is false, expression after "||" is assigned to final ga.

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• Searching the Registry for a key - JavaScript

  - by rkhj

  Hi All, Is there a way to search the Registry for a specific key?! I'm using JavaScript to do so, and the msdn Library doesn't mention any such method: http://msdn.microsoft.com/en-us/library/2x3w20xf(v=VS.85).aspx Thanks,

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• How to check undefined javascript value in facebook?

  - by Murvinlai

  In normal javascript, I can check either if (i == undefined) or if (i === undefined) or the "typeof" however, within facebook, it will have the api_key append as the prefix in undefined. i.e. it will become if (a12345_i == a12345_undefined) which is NOT undefined so, what can I do to find out the variable is undefined or not?

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• Invoking javascript in iframe from parent page

  - by DrJokepu

  Basically, I have an iframe embedded in a page and the iframe has some javascript routines I need to invoke from the parent page. Now the opposite is quite simple as you only need to call parent.functionName() but unfortunately I need exactly the opposite of that. Please note that my problem is not changing the source url of the iframe, but invoking function defined in the iframe.

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• Get the largest value from Json object with Javascript

  - by neilc

  Hi This should be an easy one. I just cant figure it out. How do I get the largest value from this piece of JSON with javascript. {"data":{"one":21,"two":35,"three":24,"four":2,"five":18},"meta":{"title":"Happy with the service"}} The key and value I need is: "two":35 as it is the highest thanks

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• Is there no Javascript LIKE statement?

  - by Etienne

  I want to do this but dont know how to do it in JavaScript. if (Email == "*aol.com" || Email == "*hotmail*" || Email == "*gmail*" || Email == "*yahoo*") { alert("No Hotmail, Gmail, Yahoo or AOL emails are allowed!"); return false; } Any way around this?

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• disable f5 and browser refreshh using javascript

  - by Salil

  Hi All, I want to disable browser refresh using javascript. Actually i am using window.onbeforeonload abd i don't want it will be called when user refresh the browser. what is the best way to do it? Regards, Salil Gaikwad

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• How to decode javascript code within <Script LANGUAGE="JScript.Encode">

  - by overboming

  I would like to implement a Python script which has the same functionality as http://www.greymagic.com/security/tools/decoder/ Is the encoding rule open for this type of javascript code encoding? Thanks.

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• Obfuscate Javascript in C# output

  - by James Jeffery

  Anyone know a way to obfuscate javascript before it's outputted to the browser? I was using http://www.javascriptobfuscator.com/ But I'm hoping there is a library that can do this on the fly. Help appreciated.

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• javascript associative array length using jquery

  - by Prashant

  Hello All I am using javascript associative array like: var testarray = []; testarray['one'] = '1'; testarray['two'] = '2'; testarray['three'] = '3'; I am also using jquery alongside. How can I check length of this associative array using jquery or any other method? Basically i want to check whether this array is empty or not. Thank you.

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• digital clock using javascript/jquery

  - by Lina

  Anybody has a suggestion on how to build a textbox that is exactly like the one showing the windows time using javascript and/or jquery?

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• JavaScript: How to get the instance name of an object

  - by Quandary

  I use the below code to write code to query a web method in a specified interval. now in the this.Poll function I have to do this.tmo = setTimeout(this.strInstanceName + ".Poll()", this.iInterval); instead of this.tmo = setTimeout(this.Poll(), this.iInterval); because IE looses the this object after setTimeout So I have to pass the class it's instance name: var objPoll = new cPoll("objPoll"); How can I get the instance name without passing it as parameter ? I want to have it outta there ! <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" > <head> <title>Intervall-Test</title> <script type="text/javascript" language="javascript"> function test() { alert("Test"); test.tmo = setTimeout(test, 2000); test.Clear = function() { clearTimeout(test.tmo); } } function cPoll(strInstanceName) { this.strInstanceName = strInstanceName ; this.iInterval = 2000; this.tmo=null; this.cbFunction=null; alert(this.Name ); this.Poll = function() { this.cbFunction(); this.tmo = setTimeout(this.strInstanceName + ".Poll()", this.iInterval); } this.Start = function(pCallBackFunction, iIntervalParameter) { if(this.tmo != null) this.Stop(); if(iIntervalParameter && iIntervalParameter > 0) this.iInterval=iIntervalParameter; this.cbFunction=pCallBackFunction; if(this.cbFunction!=null) this.Poll(); else alert("Invalid or no callback function specified"); } this.Stop = function() { if(this.tmo != null) { clearTimeout(this.tmo); this.tmo=null; } } } function CallBackFunction() { alert("PollCallBack"); } // test(); // test.Clear(); var objPoll = new cPoll("objPoll"); </script> </head> <body> <h1>Test</h1> <input type="Button" value="Start polling" onclick="objPoll.Start(CallBackFunction,3000);" /> <input type="Button" value="Stop polling" onclick="objPoll.Stop();" /> </body> </html>

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• Delete a line of text in javascript

  - by Shard

  In javascript, If i have a text block like so Line 1 Line 2 Line 3 What would i need to do to lets say delete the first line and turn it into: Line 2 Line 3

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• current x,y coordinates of cursor in text area using javascript

  - by Wind Chimez

  How can i get current x & y position of my CURSOR within a text area using javascript. The event is a Keyup event, not a mouse event. I am not looking for the current cursor position in terms of charecter but x , y coordinates.

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• javascript uml diagrammer

  - by bob

  Hi, Does anyone know of a javascript UML diagrammer? I have found the Eclipse plugin jsuml from jsuml.org, however the plugin crashes when I try to generate a diagram. Thanks, Bob

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• How to get element from javascript in JSF 2.0

  - by amorfis

  I have JSF code like: <h:inputText id="from" value="#{fromToMBean.fromName}"/> I would like to get this element from JavaScript by ID (from), but I can't, because in generated HTML it is j_idt8:from How can I get this element in e.g. jQuery? Is there any way to force JSF2 not to change ids?

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• A feature rich JavaScript IDE environment?

  - by jdk

  I'm currently using Visual Studio 2008 to edit .js files with, and it has decent support but I want more... I like the VS syntax highlighting and auto-indentation features but additionally would like advanced features like: contextual info and help, collapsible JavaScript blocks, implicit symbol understanding for searching, refactoring and that kind of thing; also warnings and errors for the js code. Suggestions?

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• How to load photoshop action with JavaScript?

  - by Elena

  Hello! How do I load photoshop's action using its javascript scripting language? Mostly curious in this action steps: Add Noise Distribution: gaussian Percent: 2% With Monochromatic Texturizer Texture Type: Canvas Scaling: 100 Relief: 3 Without Invert Texture Light Direction: Top Left

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• Is there javascript to convert HTML to markdown?

  - by Ethan

  There is showdown.js to convert markdown to HTML, and PHP Markdown to convert markdown to and from HTML. My question is, is there javascript library to convert HTML to markdown?

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• Javascript best practice: handling Firebug-specific code

  - by Dan

  Firebug is certainly a wonderful tool for javascript debugging; I use console.log() extensively. I wanted to know if I can leave the Firebug-specific code in production. What's the best practice? Commenting the debug code?

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• Javascript error after updating ASP.NET AJAX ControlToolkit

  - by empo

  I've just updated to the AJAX Control Toolkit 3.5, changed the ScriptManager to the ToolkitScriptManager in my master page and now the following javascript error occurs when an Edit button is clicked: "Object doesn't support this property or method" The line of code cuasing the error is: this._destroyTree(updatePanelElement); Any initial ideas before I post masses of code?

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• Better PHP,MySql,HTML and JavaScript IDE

  - by War Coder

  Hello guys, I am currently using the below IDE's. They serve their purposes but am wondering if there are better ones out there that i can switch to. phpDesigner v6.2.5 (For PHP) Navicat 8.0.29 (For MySql) Dreamweaver CS3 (For HTML & CSS) Spket IDE (For JavaScript) Thats my collection of production tools. Wondering if there is anyone of them i can switch to a better one. Thanks

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• javascript parse parenthesis

  - by Paul

  I need parse a string inside a parenthesis, which looks like (A, B, C), where A, B, and C are string that can contain any legal JavaScript code. For example, B might be a very long string with nested structures similar to (A, B, C). What would be the best way to parse such a string?

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• JavaScript check if anonymous object has a method

  - by Baddie

  How can I check if an anonymous object that was created as such: var myObj = { prop1: 'no', prop2: function () { return false; } } does indeed have a prop2 defined? prop2 will always be defined as a function, but for some objects it is not required and will not be defined. I tried what was suggested here: http://stackoverflow.com/questions/595766/how-to-determine-if-native-javascript-object-has-a-property-method but I don't think it works for anonymous objects .

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