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    <p>When you use <code>$.when</code> (I know, funny sentence ;)), then the values with which the promises are resolved are passed as arguments to the callback functions. I.e. in your <code>done</code> callback, the first argument refers to the resolved value of <code>deferred1</code> and the second argument to <code>deferred2</code> (whatever that is).</p> <p>Now, when an Ajax success callback is called, it gets passed three arguments:</p> <ul> <li>the response</li> <li>the status text</li> <li>the <code>jqXHR</code> object</li> </ul> <p>You are only interested in the first.</p> <p>So with this, your setup should be:</p> <pre><code>var promise1 = $.get(url); var promise2 = $('#content').fadeTo(100, 0, 'linear').promise(); $.when(promise1, promise2).done(function(ajax_success) { $('#content').html(ajax_success[0]).fadeTo(400, 1, 'linear'); }); </code></pre> <p>Also have a look at the <a href="http://api.jquery.com/jQuery.when/" rel="nofollow noreferrer"><code>$.when</code> documentation</a>.</p> <hr> <blockquote> <p>Do I need <code>promise</code>?</p> </blockquote> <p>No. It looks like <code>$.when</code> calls <code>.promise</code> internally when you pass a jQuery collection. But in other cases you would have to, so it makes sense to do this here as well, for consistency (thanks <a href="https://stackoverflow.com/users/6782/alnitak">Alnitak</a>).</p> <blockquote> <p>And should i ... ? Should I ...? What would be ...?</p> </blockquote> <p>There is no standard solution for this kind of problems. Promises are incredibly flexible and there are so many ways to use. I <em>think</em> they are not around long enough in JavaScript for standard patterns to emerge. Find/create something that makes sense to you and be consistent within your application.</p> <p>The only thing I would recommend to do if you have multiple promises is put them in an array: <a href="https://stackoverflow.com/q/8011652/218196">jQuery $.when() with variable arguments</a>.</p>
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    1. COare you sure he doesn't need `.promise()` - AIUI a jQuery object doesn't automatically implement the promise interface to indicate animation completion, you have to call `$(...).promise()` to get the desired promise.
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    2. CO@Alnitak: Afaik it does. Unless it was changed recently. *edit:* Still works: http://jsfiddle.net/y5Fk7/.
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    3. COnot that I know of, it's been that way since animation started supporting deferred in 1.6. See `http://api.jquery.com/promise/` vs the `deferred.promise()` function. Calling `.promise` on a deferred just ensures you only get a (stripped back) object that only implements the promise interface, but calling `.promise` on a jQuery object is necessary to actually create the dynamic promise that will watch that element's animation queue.
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