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• Changing background image to a button

  - by Alpan67

  I am trying to change the backgound-image of a button but it doesn't work as I thought !! the CSS is OK and it is as follows : ITA{ float:right; margin : 5px 85px; width:40px; height:40px; background : #FFFFFF url("../ITA_off.png") center center no-repeat; border:0; } my javascript function in the "HEAD" is function cambiaBandiera() { test=document.getElementById("ITA"); test.backgroundimage="ITA_on.png"; } and the button is as follows input type="button" id="ITA" onClick="cambiaBandiera()" What's wrong ? Please HELP ! Thanx in advance Alex

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• Do you draw the entire object?

  - by vbman11

  Hi I'm working on learning 3d game development and I'm starting with JavaScript and the html5 canvas and I was wondering if I were to have a 3d model do I draw the entire model(front, back, etc) and let the web browser decide what to render or should I try to just draw the sides that are in view of the camera? I ask this because I can see how it would be faster to do the latter of the 2 but that can get very complex and I'll need to do quite a bit more research to find how to do that. Thanks!!

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• A section of a program designed to swap the values of two variables [closed]

  - by gary

  Line 1.var numberOne; 2.var numberTwo; 3.numberOne = 9; 4.numberTwo = 1; 5.numberOne = numberTwo; 6.numberTwo = numberOne; For each of the lines in the program above, give the values held by numberOne and numberTwo at that point in the program. You do not need to write any JavaScript. Help me pls. Thank you.

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• Set form action dynamically in https-area

  - by Beerweasle

  Hi, heres the problem explanation: Im on the domain https://www.example.com - theres an Order-Form with the Action https://www.example-otherdomain.com with an other SSL Certificate. On some conditions i set the form action to https://www.example.com so that it will be posted on our domain, but if the user uses a CreditCart it should get posted to https://www.example-otherdomain.com. So far so good. But in some rare conditions, users with CreditCards still posts their form to https://www.example.com. So my idea is: Is there some Same-Domain-Policy for Javascript/HTTPS to protect the user from phishing? It seems that to set the FormAction to the same domain works, but not to reset it to the external one (with JS). I cant reproduce this error, so im asking here if someone knows if theres such a problem. It doesnt matter which UserAgent the user has (there are post datas from FF, Chrome, Webkit, IE7/8) Thx!

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• Fetching content from Website on another Server

  - by benny

  Hi everyone. What i basically want to do is to get content from a website and load it into a div of another website. This should be no problem so far. The problem is, that the content that should be fetched is located on a different server and i have no source access to it. I'd prefer a solution using JavaScript of jQuery. Can i use a .htacces redirect to fetch the content from a remote server with client-side (js) techniques? I will also go with other solutions though. Thanks a lot in advance!

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• Advice for building a browser-based audio mixer up to 32 tracks

  - by Jonathan P.

  As a personal hobby I am looking to build an online audio mixer where I can upload individual instrument tracks, control individual volumes of each track, and export the mixed down version. I've been trying (and have come pretty close) with javascript. I really would like to stay away from flash if possible, but I'm really looking for suggestions for technologies to try. If anyone has any suggestions on languages that are good at stuff like this or libraries that I am missing, please let me know! I have a test environment that I have been using: http://driverstestpractice.com/sandbox Currently all tracks on the site are set to the click track in order to test the track sync (which as you can tell is a little off)! Thanks!

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• typeof === "undefined" vs. != null

  - by Thor Thurn

  I often see JavaScript code which checks for undefined parameters etc. this way: if (typeof input !== "undefined") { // do stuff } This seems kind of wasteful, since it involves both a type lookup and a string comparison, not to mention its verbosity. It's needed because 'undefined' could be renamed, though. My question is: How is that code any better than this approach: if (input != null) { // do stuff } As far as I know, you can't redefine null, so it's not going to break unexpectedly. And, because of the type-coercion of the != operator, this checks for both undefined and null... which is often exactly what you want (e.g. for optional function parameters). Yet this form does not seem widespread, and it even causes JSLint to yell at you for using the evil != operator. Why is this considered bad style?

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• Open browser window with formed URL after posting a PHP form

  - by Gotjosh

  So here's the question. I have this php form that collects some data, after posting the data gets parsed an URL is constructed. After this URL is constructed, I'd like to open a new browser window for the user with this newly constructed URL. How can I actually accomplish this? Is this something that can only be done with javascript? If so... How? I already have the code in place and i've tested it works that construct the URL after posting the form, now it's just a matter of opening a new window with the URL.

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• Where exactly should I attach script in HTML

  - by bzxcv7

  I have read about several ways to embed Javascript in HTML document. First, in head section: <head> ... <script src="abc.js"></script> </head> Second, in the end of document's body: <body> <!-- content --> <script src="abc.js"></script> </body> First way is more esthetic, but second version assures that all the items in DOM are loaded. I use HTML5 (but probably it doesn't matters) Which way is better and why?

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• <a href> instead of <input submit> button

  - by Idealflip

  Hello all! Quick question I originally had a submit button. <input class="submit" type="submit" class="input" value="Add" name="command" /> but now I would like to use a instead. The issue is, the value="Add" is very important. I'm currently making the like this. <a href="javascript:document.register.submit();">submit</a> Any suggestions? Issue is, the site is not picking up that this specific was clicked, and therefore won't run my php code.

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• how to create popup panel in mozilla firefox?

  - by user495688

  hello all.. i want to ask something about popup .. how to create popup panel in my addons to show text when users click context menu? the popup panel will execute javascript function inlinetrans.process() to show the result of inlinetrans process. this is my code to show context menu : <popup id="contentAreaContextMenu"> <menuseparator /> <menuitem id="inlinetransContextMenuPage" label="Terjemahkan dengan inlinetrans" image="chrome://inlinetrans/skin/imagesOn.png" class="menuitem-iconic" hidden="false" onclick="inlinetrans.process();"/> </popup> i want to create pop up like this http://abcdefu.wordpress.com/2008/07/25/writing-beautiful-ui-with-xul/ i don't need text box but i need to display my result of translation, what should i do? thank you for helping me..:)

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• How can I programmatically copy all of the style attributes from one DOM element to another

  - by stu

  I have a page with two frames, and I need to (via javascript) copy an element and all of its nested elements (it's a ul/li tree) and most importantly it's style from one frame to the other. I get all the content via assigning innerhtml, and I am able to position the new element in the second frame with dest.style.left and dest.style.top and it works. But I'm trying to get all the style information and nothing's happening. I'm using getComputedStyle to get the final style for each source element as I loop through each node then and assigning them to the same position in the destination nodelist and nothing happens to visually change the style. What am I missing?

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• how do you get the response back into the instance of the object?

  - by randomdev

  If you've written a class in JavaScript that calls a remote service's API, and that remote API offers a callback, how do you get the response back into the instance of the object that made the request? I'll try to give you a very basic example FOO for making cross domain calls to BAR service which offers a callback. Please ignore the usual security concerns, (I own both servers). function FOO() { this.response = null; this.execute = function(url) { var script = document.createElement('script'); script.src = url; document.getElementsByTagName('head')[0].appendChild(script); } this.catch = function(response) { this.response = response; } } var sample = new FOO(); sample.execute('http://barservices.com/sample/?callback={ plshelphere: this.catch}'); I have a way to make this work, but I'm curious if there is an "accepted approach" here. Anyone have thoughts for me?

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• How can I safely decide if a variable is a string of more than one characters?

  - by Alan

  I am using the following Javascript: if (typeof content !== 'undefined' && content.length > 0) { $state.transitionTo('admin.content', { content: content }) } I thought this was safe to use but it gives me an error saying: TypeError: Cannot read property 'length' of null I am using the following function to decide if something is a number: isNumber: function (num) { // Return false if num is null or an empty string if (num === null || (typeof num === "string" && num.length === 0)) { return false; } var rtn = !isNaN(num) return rtn; }, How can I write a similar function that would very safely determine if something is a string with a length of more than 0?

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• need to run php script when form is submitted

  - by Brad

  I have a form that needs to run a php script once the submit button is clicked, it needs to be ajax. <form method="post" action="index.php" id="entryform" name="entryform"> <input type="submit" name="submit" value="Submit" onclick="JavaScript:xmlhttpPost('/web/ee_web/include/email-notification.php', 'entryform')" /> </form> In this situation, using if(form posted) { get results and run script } is not an option, I need to run the script externally, that is why I need it to execute the email-notification.php at onclick When I point my web browser to domain.com/include/email-notification.php - it runs perfectly. Any help is appreciated.

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• console.log() and google chrome

  - by Lorenzo C

  I'm testing a library and I use console.log() function to visualyze values. There is a strange behaviour of Google Chrome (in other browser like Firefox it doesn't happend). If I try to store strings in Array object when I log them, sometimes values appears undefined. Code example (item.name is a string) var arrayItemsSearch = [item.name]; var itemRedrawName = [item.name]; console.log("arrayItemsSearch: ", arrayItemsSearch); console.log("itemRedrawName: ", itemRedrawName); Firefox output is correct arrayItemsSearch: ["elem[0]"] itemRedrawName: ["elem[0]"] Chrome output is not correct arrayItemsSearch: [undefined × 1] itemRedrawName: ["elem[0]"] Is this a Chrome bug? Or is this beacuse in Javascript strings are immutable objects and so something that I don't understand goes wrong?

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• IE's responseXML.getElementsByTagName() unable to handle non English character ?

  - by trix

  I have a javascript that does this (http is your XMLHttpRequest object) var r = http.responseXML.getElementsByTagName('item'); The issue is variable r is always an empty list if the response contains non-English character (r.length is 0). The response header is correctly set Content-Type: text/xml;charset=ISO-8859-1 This is what the response from the webserver looks like <?xml version='1.0' encoding='UTF-8'?> <d> <r> <item value="jmob" label="John Möb"/> </r> </d> It happens only in IE (both IE6 and IE8), works in Firefox and Chrome. If items contain only English characters, it works fine. Is there a workaround for this ?

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• How to put focus on an element in jQuery?

  - by Prashant

  Hi, I have done the following code in JavaScript to put focus on the particular element (branch1 is a element), document.location.href="#branch1"; But as I am also using jQuery in my web app, so I want to do the above code in jQuery. I have tried but don't know why its not working, $("#branch1").focus(); The above jquery (focus()) code is not working for div, whereas If i am trying the same code with textbox, then its working, Please tell me, how can I put focus on a div elemnt using jQuery? Thanks!

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• Call load using a div id that has been passed into a function, div id is a parameter

  - by tittatty

  I am dynamically creating divs within a jquery accordion that are loaded with data as when the user clicks on the accordion title. I have this all working except that when I pass the div id into the load details method, the call to .load() does not work. What can I do to fix this? It seems like a simple javascript string eval would work but I can not find what I am looking for. Code: Here is the basic function: function loadDetails(div_id) { var load_string = "ajax/get_details.aspx"; $(div_id).load(load_string); } This function is called correctly on the click event and the div_id is passed in correctly but the load function is not working. If I use code like this it work correctly: $('#test').load(load_string);

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• Using jQuery to auto-populate a form field from another form field

  - by Jon

  Has anyone used jquery to take data from one form field and put it into another? I'm trying to create a form that when one text input is filled out a second is auto-populated with the first letter of the word that is in the first text input. I'm thinking I can limit the second text input to one character to help get the desired result, but I'm not having luck getting jquery to get the second text input and auto-populate once the first is entered. Here is the code I'm using: <script type="text/javascript"> jQuery(document).ready(function($) { $('#textBox1').keyup(function(){ if($.trim($('#textBox2').val()) == '') $('#textBox2').val($(this).val().substring(0, 1); }); }); </script> Also, do I need to have any in the text input fields of the form other than matching "textBox1" id/names? Any suggestions?

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• Need advice with HTML table

  - by misha-moroshko

  I would like to code an HTML table with messages like this: The table will contain messages that will spread over first N columns (N may change). Lets call these N columns, the message area. Each message is located on X contiguous cells in the message area. X may also change. Each message has a name that contains words separated with underscores. How would you recommend to code this table in Javascript/jQuery such that: It would be easy to define a message (start cell, end cell, color, name) The name will break only after underscores (rather than in the middle of the word)

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• Change the value of an existing onclick function

  - by Mark Peach

  I have a page that is pulling in via an iframe a page of html content from a pre-existing content management system, whose content I can not directly change. I want to use jquery to alter some of the links and button locations dynamically. For links within the page I was able to change the href attr values of <a href="/content.asp">more</a> from content.asp to content2.asp using $("a[href^='/content.asp']") .each(function() { this.href = this.href.replace("content.asp", "content2.asp"); }); But the page pulled in also has form buttons that contains javascript onclick functions e.g. <INPUT type="button" value="Add to basket" onClick="document.location='/shopping-basket.asp?mode=add&id_Product=1076';"> I basically want to use jquery to select any such buttons and change the shopping-basket.asp to shopping-basket2.asp How can I select these buttons/onclick functions and change the location string?

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• how to keep the value of a variable in a closure

  - by Florian Fida

  i need to create multiple javascript functions which have a static id inside, so the function itself knows what data to process. Here is some code: (function(){ function log(s){ if(console && console.log) console.log(s); else alert(s); } var i = 10; while (i--){ window.setTimeout(function(){ // i need i to be 10, 9, 8... here not -1 log(i); },500); } })(); The problem ist that i allways gets updated by the loop, and i need to prevent this. Thanks in advance for any help, comments or tips!

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• Add linebreak with jQuery at end of each textarea row

  - by lpetren

  So I have been googleing around for a couple of days but I have not found a solution so far, so I'm turning to you guys with hope that there even is a possible solution for this. I need to, at the end of each line in a textarea add a linebreak before it is sent to PHP. That is, even if the user does not press enter but if a word get's cut of or it just jumps down a row because it has filled the with of the textarea. And I need to do so with jQuery or Javascript. Does anyone have any good ideas on how to do so? Thanks!

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• Determine coordinates of rotated rectangle

  - by MathieuK

  I'm creating an utility application that should detect and report the coordinates of the corners of a transparent rectangle (alpha=0) within an image. So far, I've set up a system with Javascript + Canvas that displays the image and starts a floodfill-like operation when I click inside the transparent rectangle in the image. It correctly determines the bounding box of the floodfill operation and as such can provide me the correct coordinates. Here's my implementation so-far: http://www.scriptorama.nl/image/ (works in recent Firefox / Safari ). However, the bounding box approach breaks down then the transparent rectangle is rotated (CW or CCW) as the resulting bounding box no longer properly represents the proper width and height. I've tried to come up with a few alternatives to detect to corners, but have not been able to think up a proper solution. So, does anyone have any suggestions on how I might approach this so I can properly detect the coordinates of 4 corners of the rotated rectangle?

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