XMLHttpRequest causing Memory Leak in IE 7+

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I found a memory leak in the following code (the else block)

JavaScript

if (browser == "Microsoft Internet Explorer"){
    if (vers < 7){
        document.getElementById("theData").src = "data.js";
    }else{
            xmlHTTP = new XMLHttpRequest();
            xmlHTTP.open('GET', "data.js", false);
            xmlHTTP.send(null);
            eval(xmlHTTP.responseText);
            window.execScript(xmlHTTP.responseText);
            xmlHTTP = null;
            delete xmlHTTP;
    }
}else{
    var script = document.createElement('script');
    script.type = 'text/javascript';
    script.src = 'data.js';
    document.getElementsByTagName('head')[0].appendChild(script);
}//end if
refreshCount=0;

Your help is appreciated!

Posted 26-Mar-13 11:08am

Sameer Alomari

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Sergey Alexandrovich Kryukov · Answer 1 · 2013-03-26T11:25:00

Solution 1

I don't think you can do anything about it.

Are you sure you really detected the leak? How? Not all methods are reliable. Anyway, if you do have a leak, you cannot prevent it. All complains go to Microsoft :-(

—SA

Posted 26-Mar-13 11:25am

Sergey Alexandrovich Kryukov

Comments

Sameer Alomari 26-Mar-13 17:52pm

if I comment xmlHTTP.send(null); then the memory is stable! any clue?

Sergey Alexandrovich Kryukov 26-Mar-13 19:06pm

I don't know. Garbage in — garbage out. Why would anyone send null in HTTP request?
Anyway, the host system, in this case, IE7 should not allow leaks, no matter what happens in JavaScript code. So, my question is: what kind of leak and how you detect it?
Does the memory use grow in unlimited manner if you repeatedly do the HTTP request? Does to grow is you reload the same page several time and do HTTP request? And how do you measure it?
—SA

Sameer Alomari 27-Mar-13 16:17pm

This code is called by a timer every second to pull data.js file from the server, So I get a leak because the application calls this code constantly

Sergey Alexandrovich Kryukov 27-Mar-13 16:38pm

Well, I do understand what happens when you have a leak, I'm still not sure you have it... Anyway, use the memory debugger.
—SA