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    <p>Inspired by <a href="https://stackoverflow.com/questions/5202296/add-a-hook-to-all-ajax-requests-on-a-page/5202312#5202312">aviv's answer</a>, I did a little investigating and this is what I came up with.<br> <strong>I'm not sure that it's all that useful</strong> as per the comments in the script and of course <strong>will only work for browsers using a native XMLHttpRequest object</strong>.<br> I think it will work if javascript libraries are in use as they will use the native object if possible. </p> <pre><code>function addXMLRequestCallback(callback){ var oldSend, i; if( XMLHttpRequest.callbacks ) { // we've already overridden send() so just add the callback XMLHttpRequest.callbacks.push( callback ); } else { // create a callback queue XMLHttpRequest.callbacks = [callback]; // store the native send() oldSend = XMLHttpRequest.prototype.send; // override the native send() XMLHttpRequest.prototype.send = function(){ // process the callback queue // the xhr instance is passed into each callback but seems pretty useless // you can't tell what its destination is or call abort() without an error // so only really good for logging that a request has happened // I could be wrong, I hope so... // EDIT: I suppose you could override the onreadystatechange handler though for( i = 0; i &lt; XMLHttpRequest.callbacks.length; i++ ) { XMLHttpRequest.callbacks[i]( this ); } // call the native send() oldSend.apply(this, arguments); } } } // e.g. addXMLRequestCallback( function( xhr ) { console.log( xhr.responseText ); // (an empty string) }); addXMLRequestCallback( function( xhr ) { console.dir( xhr ); // have a look if there is anything useful here }); </code></pre>
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