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    <p>My bet is that the canceled <code>XMLHttpRequests</code> are a result of leaving the (iframe's) current page. </p> <p>Since you <em>do not prevent</em> the <code>click</code> event from triggering its default behavior (i.e. getting the referenced document) all the queued up event handler callbacks are being canceled once the current page unloads (keep in mind that though the AJAX calls themselves are asynchronous, the execution of the event handler callbacks is not).</p> <p><strong>EDIT</strong><br> There actually is a limit on the number of simultaneously requests to a single domain. This limit is imposed by the browser and does vary quite a bit (2 and 6 being the most common). </p> <p>See the network test from <a href="http://www.browserscope.org/?category=network" rel="nofollow">browserscope</a>.</p> <p><strong>EDIT 2</strong><br> Oh and btw. you might want to use <code>POST</code> instead of <code>GET</code> to be sure the browser won't cancel the request due to a cache hit. And if you absolutely need to make every click count, you should set the <code>async</code> flag to <code>false</code> when calling <code>new_request.open</code>. This way, all the requests will get queued up and run one after the other.</p> <p>Quick fix:</p> <pre><code>var text = "Click no:-"; var counter = 0; $("#inc").click(function() { var new_request = new XMLHttpRequest(); var new_serverURL = "http://www.google.com"; new_request.open('POST',new_serverURL,true); new_request.send(null); $("#container").html("&lt;p&gt;" + text + " " + ++counter + "&lt;/p&gt;"); // Prevent the link's default behavior return false; });​ </code></pre>
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    1. POAJAX request not getting called on fast clicks
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    1. COPreventing the link's default behavior is not even wokring. You can try it on the jsfiddle itself :(
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    2. COSure does. The reason why the AJAX calls get canceled is because of the browser's cross-domain policy. Try this http://jsfiddle.net/nXYQP/15/ and see for yourself.
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    3. CORegarding the difference between the number of (fast) clicks and the number of AJAX calls actually sent: I've edited my answer to provide an explanation and a resource to get the stats.
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