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POjQuery .when troubleshooting with variable number of arguments
 

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  1. POjQuery .when troubleshooting with variable number of arguments
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    <p>I'm having an issue with using jQuery.when() to wait for multiple ajax requests to finish before calling another function.</p> <p>Each ajax request will get JSON data, and looks something like this:</p> <pre><code> function loadData(arg){ var ajaxCall = $.ajax( URL // depends on arg ) .error( .... ); return ajaxCall; } </code></pre> <p>When the request is called, the return value (ajaxCall) is added to a list called ajaxRequests.</p> <pre><code> ajaxRequests = []; ajaxREquests.push(loadData(arg)) </code></pre> <p>When all the requests have been made, I'm trying to pass ajaxRequests to $.when in order to wait for all requests to complete.</p> <pre><code> var defer = $.when.apply($, ajaxRequests); defer.done(function(args){ for (var i=0; i&lt;args.length; i++){ inst.loadData($.parseJSON(args[i].responseText)); } inst.draw(); }); </code></pre> <p>inst is an object that loads and draws graphs based on JSON data.</p> <p>The problem is that it doesn't seem to be actually waiting for the requests to finish - args[i] is an object, but responseText is undefined when the code runs. If I save args[i] and access it later from the console, it works.</p> <p>I suspect the problem is related to using .when with an arbitrary number of arguments, as all the examples I've seen on the web give it a pre-defined argument list.</p> <p>I'm not sure if using apply was the right idea or not, but either way it doesn't work properly and behaves erratically (browser-dependent).</p> <p>Any help would be greatly appreciated.</p> <p>Please let me know if more information is required.<br> I'm using jQuery 1.5</p>
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    1. COMaybe it's just me, but the syntax you have in your code doesn't seem to match that from the jQuery API (http://api.jquery.com/jQuery.when/). Perhaps you want to try that syntax and see if it works?
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    2. COI believe his point was that he is not using it the way it is shown in the docs because he has a variable number of arguments.
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      1. USGreg Ennis
    3. CO@grennis Exactly.
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