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POTrouble intercepting AJAX (XHR) requests from GreaseMonkey script
 

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  1. POTrouble intercepting AJAX (XHR) requests from GreaseMonkey script
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    <p>My userscript's task is fairly simple -to listen to XHR requests via an XHR bridge sort of functionality, manipulate the data received, and return it back. Everything happening transparently, of course.</p> <p>I came across this reply <a href="https://stackoverflow.com/questions/629671/how-can-i-intercept-xmlhttprequests-from-a-greasemonkey-script/629782#629782">How can I intercept XMLHttpRequests from a Greasemonkey script?</a> on SO -- which provides the following code-snippet: </p> <pre><code>(function(open) { XMLHttpRequest.prototype.open = function(method, url, async, user, pass) { this.addEventListener("readystatechange", function() { console.log(this.readyState); }, false); open.call(this, method, url, async, user, pass); }; })(XMLHttpRequest.prototype.open); </code></pre> <p>The code works as expected when pushed via FireBug. It, however, doesn't do anything in a Greasemonkey script. </p> <p>On further searches, I came across another reply: <a href="https://stackoverflow.com/questions/688884/how-intercept-xhr-with-greasemonkey/688909#688909">how intercept xhr with greasemonkey</a> -- which mentions that:</p> <blockquote>Greasmonkey and Firefox 3.x doesn't currently support the "prototype"-property. Please see the following ticket for more information: http://greasemonkey.devjavu.com/ticket/164 </blockquote> <p>I have two basic queries: </p> <ol> <li>Does this apply to Fx v3.5.x as well? (Note: The ticket link on devjavu.com isn't accessible) </li> <li>What does signature <code>(function(){})()</code> mean in Javascript. (Kindly bear, am not an expert in advanced JS).</li> </ol>
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    1. COFurther to Tomasz's answer (to Q#2), here's a pointer for others: http://www.hunlock.com/blogs/Functional_Javascript#quickIDX5
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