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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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  • Escaping Strings in JavaScript

    - by Steve Harrison
    Hello, Does JavaScript have a built-in function like PHP's addslashes (or addcslashes) function to add backslashes to characters that need escaping in a string? For example, this: This is a demo string with 'single-quotes' and "double-quotes". ...would become: This is a demo string with \'single-quotes\' and \"double-quotes\". Thanks, Steve

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  • Notify user on database change? JavaScript/AJAX

    - by Andreas Carlbom
    Yo. I'm really quite new to this whole JavaScript business, not to mention AJAX, so I was thinking if you guys could help me out with a conundrum. Basically, what I want is for the user to be notified upon a change in a value of a MySQL table. How should I go about that? Should I use jQuery, or can I slap something together myself? Thankful for any and all replies.

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  • javascript: why to "sign-prefix" a variable?

    - by harald
    hello, i'm currently looking at a little 3rd-party javascript library and i see a lot of "sign-prefixed" variables in it: function_call(+value); i know, that you can swap the sign, if you prefix a variable with '-', but why to prefix something with a '+' -- it doesn't do anything to the value, no? thanks in advance!

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  • JavaScript Concat

    - by nobosh
    Via jquery / Javascript Given a number 1234567891234 How can I concat, or truncast By removing the 2 from the left to make that number a valid integer I can insert into MySQL:' 4567891234 Thanks

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  • A question about John Resig's Simple Javascript Inheritance.

    - by Zippo
    I'm using this simple code: http://ejohn.org/blog/simple-javascript-inheritance/ Using this "library", I made this simple class: var Person = Class.extend({ init: function(openningSentence) { this.say(openningSentence); }, say: function(words) { alert(words); } }); The problem with this class, is that I can't call a function using the variable "this" (line 3 in the code gives an error: unknown method "say"). Does anybody knoes if there's a solution for this problem? Btw - I'm using jquery, so if there's a jquery-based solution It'll be great :)

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  • Open Javascript dialog from Opensocial gadget

    - by Pablo Fernandez
    Hi, I need to open a javascript dialog (either window.open or window.showModalDialog will do), from an opensocial gadget. It's just to make the OAuth flow. The problem is that the window gets blocked by the popup blockers. I know this is possible because facebook gadget does that. Any ideas please?

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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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  • DRY URL's in Django Javascript

    - by Noio
    I'm using Django on Appengine. I'm using the django reverse() function everywhere, keeping everything as DRY as possible. However, I'm having trouble applying this to my client-side javascript. There is a JS class that loads some data depending on a passed-in ID. Is there a standard way to not-hardcode the URL that this data should come from? var rq = new Request.HTML({ 'update':this.element, }).get('/template/'+template_id+'/preview'); //The part that bothers me.

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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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  • Appending javascript code piece to the end of the body tag

    - by uzay95
    I am looking for a way to insert javascript code block to end of ASP.NET page. Page.ClientScript.RegisterClientScriptBlock(typeof(Page), "showVideo", sScript, true); is appending to body but js codes are always requesting some js files didn't load or some functions are below of the script. How can i append scripts that i generated dynamically to the bottom of body? Thanks for your help.

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  • How to dynamic call property on javascript object with jQuery

    - by Massimo Ugues
    Hallo all. I got a javascript object with some propeties let's say function Animal() { this.id; this.name; I need to call id function in a dynamic way to get and set its value: something like this Animal animal = new Animal(); var propertyName = "id"; animal.+propertyName = "name"; Is there an elegant way to do it? With jQuery? Kind regards Massimo

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  • Display label character by character using javascript

    - by Muhammad Sajid
    Hi, I am creating Hang a Man using PHP, MySQL & Javascript. Every thing is going perfect, I get a word randomly from DB show it as a label apply it a class where display = none. Now when I click on a Character that character become disable fine which i actually want but the label-character does not show. My code is: <link href="style.css" rel="stylesheet" type="text/css" media="screen" /> <?php include( 'config.php' ); $question = questions(); // Get question. $alpha = alphabats(); // Get alphabets. ?> <script language="javascript"> function clickMe( name ){ var question = '<?php echo $question; ?>'; var questionLen = <?php echo strlen($question); ?>; for ( var i = 0; i < questionLen; i++ ){ if ( question[i] == name ){ var link = document.getElementById( name ); link.style.display = 'none'; var label = document.getElementById( 'questionLabel' + i ); label.style.display = 'block'; } } } </script> <div> <table align="center" style="border:solid 1px"> <tr> <?php for ( $i = 0; $i < 26; $i++ ) { echo "<td><a href='#' id=$alpha[$i] name=$alpha[$i] onclick=clickMe('$alpha[$i]');>". $alpha[$i] ."</a>&nbsp;</td>"; } ?> </tr> </table> <br/> <table align="center" style="border:solid 1px"> <tr> <?php for ( $i = 0; $i < strlen($question); $i++ ) { echo "<td class='question'><label id=questionLabel$i >". $question[$i] ."</label></td>"; } ?> </tr> </table> </div>

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  • Javascript: detect when a window is resized ?

    - by Patrick
    Is there any way with jQuery or javascript to trigger a function when the user ends to resize the browser window ? In other terms: 1) Can I detect mouse up event when user is resizing the browser window ? otherwise 2) Can I detect when a window resize operation is finished ? I'm currently only able to trigger an event when the user start to resize the window with jquery thanks

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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 save xml files using Javascript?

    - by user311884
    Dear friends, I tried to 1) load an xml file using javascript as an object, say "note.xml" 2) then save the object to a new xml file, say "note_new.xml" I did 1) but failed 2) I tried to use method save() to do 2). After my failure, I checked ms site and they said save() is not supported.... could some one enlighten me how to do the save? thank you! here is the code: <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/> </head> <body> <h1>W3Schools Internal Note</h1> <p><b>To:</b> <span id="to"></span><br /> <b>From:</b> <span id="from"></span><br /> <b>Message:</b> <span id="message"></span> <script type="text/javascript"> if (window.ActiveXObject){ alert("there is ActiveXObject"); var xmlDoc = new ActiveXObject("Microsoft.XMLDOM"); xmlDoc.async=false; xmlDoc.load("note.xml"); }else{ alert("i am not withActiveXObject!"); xhttp=new XMLHttpRequest(); xhttp.open("GET","note.xml",false); xhttp.send(""); xmlDoc=xhttp.responseXML; } xmlDoc.save("note_new.xml"); </script> </body> </html> update: seems this is related to security issue. I appologize to those experienced programmers for my putting this question in a rush because it seems a newbie question.

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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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