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• How do I setup a shared session between two users on my Ruby on Rails powered site?

  - by ben

  Hey guys, The website that I'm building includes a section where two users can interact. I think I know how to do most of it, except the actual session sharing part. I'm using Ruby on Rails & Javascript (jquery), and I've got user login and session management all working okay. Would the best way to create a shared session be to have a SharedSession model, with accompanying database table, with participant1ID, participant2ID etc? Is there a better way? Thanks so much for reading!

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• Which Java Web Framework allows Cross-Domain Javascripting (http proxy) ?

  - by snsd

  So just a quick intro, I am starting to explore Vaadin, and it's absolutely perfect. Previously, I was juggling PHP, Perl, Ruby, and Jquery for designing rich client web application. It didn't work out too well, as I've burnt out from trying to fix cross browser issues (aka get-it-to-work-on-IE-damn-it), handling server-side, client-side, and building a robust communication between the two tier had lot of code not related to application logic....by the time I was burnt out, only tiny bit of application logic was implemented. Vaadin seems like the answer to my problem as it only requires Java and built on top of GWT. However, I am curious how I can incorporate Cross-Domain Javascripting ? Back in LAMP environment, I had a CGI proxy script that loaded external URL, and injected JS into the proxy-loaded page. I used the CGI proxy script, as it rendered Javascript of the external URL well. Is there a class or package for Java or a specific Java web framework similiar to Vaadin that makes this possible ? Thank you.

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• HTML5 video element non-seekable when using Django development server

  - by Ory Band

  Hey everyone. I've got a Django app serving a webpage with an HTML5 element. There's a wierd "feature", turning the video element to be non-seekable: video.seekable returns a timeRanges object with length=0, whereas it should be length=1. This means I can't edit the video. JavaScript can't do anything either. The thing is, when I upload the problematic webpage, statically - no Django, just plain HTML/JS/CSS - to my website for testing, it works fine - length=1. However, if I try to serve the same static page on my Django dev server still gives the same problem. I am using Django's static serving for dev/debug purposes - Do you have any idea what is causing this, or how can I fix it? Thanks.

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• Is it the filename or the whole URL used as a key in browser caches?

  - by Richard Turner

  It's common to want browsers to cache resources - JavaScript, CSS, images, etc. until there is a new version available, and then ensure that the browser fetches and caches the new version instead. One solution is to embed a version number in the resource's filename, but will placing the resources to be managed in this way in a directory with a revision number in it do the same thing? Is the whole URL to the file used as a key in the browser's cache, or is it just the filename itself and some meta-data? If my code changes from fetching '/r20/example.js' to '/r21/example.js', can I be sure that revision 20 of example.js was cached, but now revision 21 has been fetched instead and it is now cached?

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• CSS or JS max. character <h2> and replace end with "..."

  - by cr0z3r

  Hey I assume my title basically summed it all up. I have a <h2> title, and I want it to have a max character property, be it CSS or javascript, so that whenever this maximum limit is passed, the title's end is replaced by ... (three dots). Thank you very much in advance. An example can be viewed here: http://themeforest.net/forums/thread/now-accepting-bargain-submissions/23205 (see the title) P.S. Any idea why I had to create a new user? the login-feature through google doesn't recognize my previous user :(

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• __defineSetter__ on innerHTML stops it from rendering

  - by Tokimon

  Hi, i'm trying to create a watch method for HTML elements, using __define[GS]etter__ when a property is changed. It reacts just fine when i set the value, but if the property listened to, is innerHTML, it somehow fails to render the given string. So basically, when im adding something to innerHTML it doesn't show. Im using the watch method described in this previous question: http://stackoverflow.com/questions/1269633/javascript-watch-for-object-properties-changes I could of cause just not listen to innerHTML changes, but i'm also wondering if the __defineSetter__ somehow prevents original handling of setting the value. Thanks!

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• Defining action on window load

  - by zac

  I am trying to get a page to display specific properties depending on whether or not a specific cookie is set... I am trying this var x = readCookie('age'); window.onload=function(){ if (x='null') { document.getElementById('wtf').innerHTML = ""; }; if (x='over13') { document.getElementById('wtf').innerHTML = ""; }; if (x='not13') { document.getElementById('emailBox').innerHTML = "<style type=\"text/css\">.formError {display:none}</style><p>Good Bye</p><p>You must be 13 years of age to sign up.</p>"; }; } It always just defaults to whatever is in the first if statement... I am still learning my javaScript so I am sure this is sloppy.. can someone please help me get this working?

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• change value of input element!

  - by Lina

  is it able to "override/overwrite" an input element fixed value using javascript and/or jquery? i.e. if i have an input element like this: <div id="myDiv"> <input type="text" name="inputs" value="someValue" /> </div> is it possible to make a jquery object of that element and then change its value to something else then rewrite the jquery object to the dom?? i'm trying but obviously i haven't got good results! i've been trying something like this: $('input').val("someOtherDynamicValue"); var x = $('input'); $("#myDiv").html(x);

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• How to Get the Method/Function Call Trace for a Specific Run?

  - by JackWM

  Given a Java or JavaScript program, after its execution, print out a sequence of calls. The calls are in invocation order. E.g. main() { A(); } A() { B(); C(); } Then the call trace should be: main -> A() -> B() -> C() Is there any tool that can profile and output this kind of information? It seems this is common a need for debugging or performance tuning. I noticed that some profilers can do this, but I prefer a simpler/easy-to-use one. Thanks!

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• passing variables with JQuery

  - by vick

  <script type="text/javascript" charset="utf-8"> $(document).ready(function() { $("a").click(function() { $("#myDiv").load( "job_board_data.php", { pageNo: $(this).text()} ); return false; }); }); </script> <a href="job_board_data.php?p=1">1</a> How can I pass variables to my job_board_data.php script???? I want to pass variables such as page, sort by .. anyone?

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• using ajax url to call function

  - by Steven Vanerp

  Hopefully I can ask this correctly cuz I know what I want it to do but can't seem to find any answers from searching. I have a func.php page where I have all my functions and I want ajax to use one function from that page. func.php function toptable() { echo"something happens in here"; } index.php <?php include 'func.php'; ?> <script type="text/javascript"> function check_username() { uname=document.getElementById("username").value; var params = "user_id="+uname; var url = "topoftable()"; $.ajax({ type: 'POST', url: url, dataType: 'html', data: params, beforeSend: function() { document.getElementById("right").innerHTML= 'checking' ; }, complete: function() { }, success: function(html) { document.getElementById("right").innerHTML= html ; } }); } </script> Make sense?

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• new MyClass(); vs new MyClass;

  - by Bytecode Ninja

  In some JavaScript code snippets (e.g. http://mckoss.com/jscript/object.htm) I have seen objects being created in this way: var obj = new Foo; However, at least at MDC, it seems that the parentheses are not optional when creating an object: var obj = new Foo(); Is the former way of creating objects valid and defined in the ECMA standard? Are there any differences between the former way of creating objects and the later? Is one preferred over the other? Thanks in advance.

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• Logging on to two sites simultaneously

  - by James Wakefield

  I want to log on to two sites simultaneously to enable a single sign on solution. We have a smallish wiki that is created with Apple wiki and we have an intranet site on a aspx cms system by Elcom. Both use Active Directory for credentials. Currently they are on different domains, but we could enable a rewrite using our load-balancer (Citrix Netscaler) or IIS. These sites are on different servers, one a mysterious Mac system and the other an IIS v6.0 on windows 2003. Now I am almost certain that a reverse proxy set up will solve this but I really just need someone to agree that this solves this issue, and if there are things I should look out for what they might be. I just want to have an invisible log on screen in an iframe and enter clone the user name and password using javascript.

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• TinyMCE: experiences, options

  - by YsoL8

  Hi I am considering using TinyMCE to handle the textboxes on sites I develop. I have the production version downloaded. At first I will be using it for the backend of a client's site on a deadline and I need it to work out of the box initally. In the future I also like the customisation options. Basically, does TinyMCE work, is it stable and is it cross browser compatible in a normal server environment? I am a PHP developer with limited Javascript skills.

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• Change save to file name but from the client

  - by Rhythmic Algorithm

  This question asks about file name the servers sends and the fix was quite simply a content-disposition header in the http response. What I interested in is does anyone know of any way to do this from the client side if the file name is already known? Is there any special javascript to do this for example? A site I have to use but not mine has a FileDownload.aspx but it doesn't send the content-disposition header. I know the filename and would like to be able to create a firefox extensions to use for the poorly coded web site. Thanks

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• Getting all selected checkboxes in an array

  - by Click Upvote

  So I have these checkboxes: <input type="checkbox" name="type" value="4" /> <input type="checkbox" name="type" value="3" /> <input type="checkbox" name="type" value="1" /> <input type="checkbox" name="type" value="5" /> And so on. There are about 6 of them and are hand-coded (i.e not fetched from a db) so they are likely to remain the same for a while. My question is how I can get them all in an array (in javascript), so I can use them while making an AJAX $.post request using Jquery. Any thoughts? Edit: I would only want the selected checkboxes to be added to the array

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• iPhone/Safari: fixed div sticks in the middle of the page when coming back by "history.back(-1)"

  - by praegustator

  Having a problem with fixed div using iPhone's Safari. I know that in iOS 5 the functionality for position:fixed have been added. My div is positioned at the top of the screen and behave pretty good, anyway, there are some bugs during scrolling. But what actually makes me angry - it is the position of this div after coming back to the current page clicking on javascript:history.back(-1) link. The fixed div sticks in the middle of a screen. When I try to scrool, it jumps back on the right position. Is there any cure for the bug?

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• Updating a popup window from source page

  - by Blem

  I have a list of people wrapped in a-tags with onclick for opening a popup window. That popup window contains a previous and next button that invoker a function in the parent window to get the previous/next a-tag and execute the onclick for it. nextAnchor.onclick(); This should update the popup window with the new persons info, but it doesn't update. Adding an alert("") right after makes it update. What i found searching is something about having to leaving the session before JavaScript will update the display and they suggested using setTimeout. Problem is i'm calling on a DOM element and i can't send it in to the setTimeout, so i ended up with setTimeout('eval("'+nextAnchor.getAttribute("onClick")+'")',10); So is there another way to make it update or a way of making the setTimeout use the onclick of a DOM element or is this an acceptable solution even though it uses eval?

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• need to changed markup with jquery

  - by user357034

  I have the following markup which I do not have direct access to... <a href="javascript:void(0);" onclick="window.open('/BulkDiscounts.asp?ProductID=318&ProductCode=' + escape('LB30X40ES') + '&Orig_Price=22.95', 'Discounts', 'scrollbars,status,resizable,width=330,height=300');"><iimg src="/v/vspfiles/templates/100/images/buttons/btn_quantitydiscounts.gif" border="0" align="absmiddle"></a> I need to "rewrite" the above as follows... A few things to point out is that the title is coming from a variable escape(global_Current_ProductCode) variable=productcode in the case above it is LB30X40ES The height and weight, price and product id used in the second markup must be from the first markup. Note that these change depending on the product loaded. These are not constants. I would guess the first thing to do was to add the thickbox class. Then I am lost as to what to do next. Basically I need to open up an thickbox iframe with the modified markup.

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• Alligator tags(<% %>) inside js string?

  - by bangoker

  I am trying to redirect a page reading the url from the config file. However, when I try this: <script type="text/javascript"> <%string redirectUrl = System.Web.Configuration.WebConfigurationManager.AppSettings["RedirectURL"];%> window.parent.location.replace("<%=redirectUrl%>"); </script> the alligator tags <% % are Not being highlighted, and when I run I get the following error in the yellow screen: the controls collection cannot be modified because the control contains code blocks (i.e. <% ... %>). What am I doing wrong?? Thanks!

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• Prevent double submission of forms in jQuery

  - by Adam

  I have an form that takes a little while for the server to process. I need to ensure that the user waits and does not attempt to resubmit the form by clicking the button again. I tried using the following jQuery code: <script type="text/javascript"> $(document).ready(function(){ $("form#my_form").submit(function(){ $('input').attr('disabled','disabled'); $('a').attr('disabled','disabled'); return true; }) }); </script> When I try this in Firefox everything gets disabled but the form is not submitted with any of the POST data it is supposed to include. I can't use jQuery to submit the form because I need the button to be submitted with the form as there are multiple submit buttons and I determine which was used by which one's value is included in the POST. I need the form to be submitted as it usually is and I need to disable everything right after that happens. Thanks!

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• Old functions return 'undefined' error once I add a jquery reference

  - by Lapa

  Disregard this question: I've simply confused <script src="..."></script> tag and <script> [some functions] </scipt> tags. I have this function function OnLoad() { ShowHideConfirmAnswers(); return true; } triggered by onload event: <body onload=OnLoad()> It works fine until I add src="jquery-1.4.2.js" to the script element. From this moment I get "OnLoad is not defined" error, and the same happens to every other javascript function.

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• from JS to iphone dev - what's the best language to start with?

  - by Enkai

  I am a total beginner and would like to eventually learn to develop for the iphone. I have just done a beginner's CS course where the language we learned was JavaScript. We studied basic concepts like: variables, arrays, loops (for,while,if,if..else..), properties and functions. I'm wondering if I am starting in the right/wrong place by following this book: Learn C on the Mac by Dave Mark? I have read a few chapters and am finding it a bit hard to get my head around the way that C works, for example the way that Strings are printed seems overly complicated as compared to JS. Do you think that JS was the wrong language to start off with and would I be better to go from JS straight to Objective-C rather than to C? I have tried to read up on previous threads on the merits/demerits of learning C first but haven't found any that relate JS to learning C/Obj C/ Cocoa. Any advice appreciated as I am very new to this. Thanks

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• thoughts on making a widget?

  - by Haroldo

  I'm only going to be able to get each site that wants my widget, to copy and paste the code block in once.. So it needs to be really future proof. I've thought about this for a while and this is the widget code i've come up with : <script type="text/javascript" src="http://www.mydomain.com/my-future-proof-widget.js"></script> <div id="mywidget"></div> would this be the best plan? could this create any limitations? any other thoughts on widgetry?!

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• I have two list boxes(A,B) with some values and i can send values from A to B or B to A

  - by Dev

  I have two list boxes(A,B) with some values and i can send values from A to B or B to A and i have one save button. For the first time without updating any list box if i click on save button i am showing message like "NO changes or Done" But once i send one item from A to B and again sending that same item from B to A it means no changes or Done. here also i want to show same message "NO changes or Done" .but i am unable to fine the staus can any one pleasse give code or tips to find the default status for listboxs in javascript. Thanks

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