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    <p>This is a variable jQuery uses internally, but had no reason to hide, so it's there to use. Just a heads up, <a href="http://github.com/jquery/jquery/blob/master/src/ajax.js#L574" rel="noreferrer">it becomes <code>jquery.ajax.active</code> next release</a>. There's no documentation because it's <em>exposed</em> but not in the official API, lots of things are like this actually, like <a href="http://github.com/jquery/jquery/blob/1.4.2/src/data.js#L4" rel="noreferrer"><code>jQuery.cache</code></a> (where all of <a href="http://api.jquery.com/jQuery.data/" rel="noreferrer"><code>jQuery.data()</code></a> goes).</p> <p>I'm guessing here by <em>actual</em> usage in the library, it seems to be there exclusively to support <a href="http://api.jquery.com/ajaxStart/" rel="noreferrer"><code>$.ajaxStart()</code></a> and <a href="http://api.jquery.com/ajaxStop/" rel="noreferrer"><code>$.ajaxStop()</code></a> (which I'll explain further), but they only care if it's 0 or not when a request starts or stops. But, since there's no reason to hide it, it's exposed to you can see the actual number of <strong>simultaneous</strong> AJAX requests currently going on.</p> <hr> <p>When jQuery starts an AJAX request, <a href="http://github.com/jquery/jquery/blob/1.4.2/src/ajax.js#L282" rel="noreferrer">this happens</a>:</p> <pre><code>if ( s.global &amp;&amp; ! jQuery.active++ ) { jQuery.event.trigger( "ajaxStart" ); } </code></pre> <p>This is what causes the <a href="http://api.jquery.com/ajaxStart/" rel="noreferrer"><code>$.ajaxStart()</code></a> event to fire, the number of connections just went from 0 to 1 (<code>jQuery.active++</code> isn't 0 after this one, and <code>!0 == true</code>), this means the first of the current <strong>simultaneous</strong> requests started. The same thing happens at the other end. When an AJAX request stops (because of <a href="http://github.com/jquery/jquery/blob/1.4.2/src/ajax.js#L379" rel="noreferrer">a <code>beforeSend</code> abort via <code>return false</code></a> or an <a href="http://github.com/jquery/jquery/blob/1.4.2/src/ajax.js#L518" rel="noreferrer">ajax call <code>complete</code> function runs</a>):</p> <pre><code>if ( s.global &amp;&amp; ! --jQuery.active ) { jQuery.event.trigger( "ajaxStop" ); } </code></pre> <p>This is what causes the <a href="http://api.jquery.com/ajaxStop/" rel="noreferrer"><code>$.ajaxStop()</code></a> event to fire, the number of requests went down to 0, meaning the last <strong>simultaneous</strong> AJAX call finished. The <a href="http://api.jquery.com/category/ajax/global-ajax-event-handlers/" rel="noreferrer">other global AJAX handlers</a> fire in there along the way as well.</p>
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    1. USNick Craver
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    1. COThat's great Nick. Much appreciated :)
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    2. COI saw it described in a book jQuery Novice to Ninja (2010)
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    3. CO@Nick : As per your explanation of .ajaxStop will be executed after every ajax call completed. But, it will be called if all ajax calls were completed. Can you please correct me if I am wrong.
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      1. USKishore Relangi
 

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