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    <pre><code>get_each_total(function () { alert("success")}); </code></pre> <p>here you have the <code>function (){ alert ....</code> that returns a function object</p> <pre><code> get_each_total(alert("success")); </code></pre> <p>here <code>alert("success")</code> is an object of whatever type <code>alert()</code> returns and it is not a function.</p> <p><strong>Edit:-</strong> in respone to the comment i'm going to further clarify.</p> <p>when the browser sees</p> <pre><code>do_something(is_it_complete(arg1, arg2)); </code></pre> <p>it goes throught the following steps:</p> <ol> <li>Get the function <code>is_it_complete</code> and call it arguments <code>arg1</code> and <code>arg2</code>.</li> <li>get the function <code>do_something</code> and call it with the result of the above as an argument.</li> </ol> <p>When the browser sees:</p> <pre><code>do_something(function () { is_it_complete(arg1, arg2) }); </code></pre> <p>it does:</p> <ol> <li>Create a function object that calls <code>is_it_complete(arg1, arg2)</code></li> <li>Get the function <code>do_something</code> and call it with the above object as an argument.</li> </ol> <p><strong>Edit 3:-</strong> Ok so in the first one it called the alert before running your code so it appeared to work.</p> <p>you have:</p> <pre><code>get_each_total = function(callback) { // ... *snip* return requests.push($.getJSON(url, function(data) {})); return $.when.apply($, requests).then(function() { // ... *snip* }); }; </code></pre> <p>the second return is never reached.</p> <p><strong>Edit:-</strong> thought i would put a few tips after reading the code:</p> <pre><code>var requests; requests = []; </code></pre> <p>is redundant change that style to </p> <pre><code>var requests = []; var url = " ...."; </code></pre> <p>When you do not pass any arguments to a callback do no wrap it. </p> <pre><code>.then(function(){ callback();}) </code></pre> <p>it is the same as:</p> <pre><code>.then(callback); </code></pre> <p>and as mentioned in the comments your url</p> <pre><code>url = "http://otter.topsy.com/hjhkl/sehjkhhkjhkarch.js?callback=?&amp;apikey=38A260E9D12A4908B1AF9184B691131&amp;q=justin+bieber&amp;window=d"; </code></pre> <p>Should be</p> <pre><code>url = "http://otter.topsy.com/hjhkl/sehjkhhkjhkarch.js?callback=somevalue&amp;apikey=38A260E9D12A4908B1AF9184B691131&amp;q=justin+bieber&amp;window=d"; </code></pre> <p>or even:</p> <pre><code>url = "http://otter.topsy.com/hjhkl/sehjkhhkjhkarch.js" $.getJSON(url, { "callback": "somevalue", "apikey": "38A260E9D12A4908B1AF9184B691131", "q": "justin bieber", "window": "d" }, function(data){ alert("Got: " + data);}); </code></pre>
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    1. POJquery deferred call back oddness
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    1. USJames Khoury
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    1. COSo why can you not wrap the callback in an anonymous function, shouldn't the way that code is built run the call back after the deferrers complete?
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    2. COyou **must** wrap the code in a function. `function(){ ... }` is an object of type function. `alert()` means get me the result of this function. I'll add more to explain the situation.
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    3. COThen why when wrapped are the alerts never called
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