Why AJAX has a memory leak? - ClientAPI Component [Lead: Jon Henning]

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12/11/2005 10:18 PM

	yang jj
1 posts

Why AJAX has a memory leak?

Modified By Jon Henning on 12/12/2005 1:07:18 PM)

Mr. Jon:
I have a problem when i use ClientAPI to work. All the codes work properly, but have memory leak, i cannot find the reason. I check my script code, but no wrongs there. So beg your help.
When I comment all the sentences in the function clt369_successFunc(result, ctx), it has also memory leaks, but only 4k/s. But parse the returned result string and assign the string to the HTML element, it has 16k/s maybe more.

The script code is as follows:
Removed script from post since it was causing errors

12/12/2005 9:09 AM

	Jon Henning
1605 posts
www.codeendeavors.com

Re: Why AJAX has a memory leak?

I believe I isolated the issue. Please open up your dnn.xmlhttp.js file in the js folder and change the following function (approx line 109)

dnn_xmlhttp.prototype.XmlHttpRequest.prototype.onreadystatechange = function ()

{

if (this.statusFunc != null)

this.statusFunc(this._request.readyState, this.context);

if (this._request.readyState == '4')

{

this.complete(this._request.responseText);

this._request.onreadystatechange = new function() {};//stop IE memory leak. Not sure why can't set to null;

}

Let me know if this fixes the issue for you so I can release an appropriate patch.

12/13/2005 9:57 PM

	Michael wang
3 posts

Re: Why AJAX has a memory leak?

Thank you for your reply. I change the function as you directed, but it didnot work well as i expected.

As time goes, the memory used is increased continously. I thinks this over and over again, but i can't find

the reason. So i being to think that i can't use the AJAX in timer function. I changed my script, use the function

"setTimeout" instead of the function "setInterval", but the reault is as usual.

Please check my script if there are some mistakes. If there are some, tell me so i can get the expected result.

12/14/2005 8:53 AM

	Jon Henning
1605 posts
www.codeendeavors.com

Re: Why AJAX has a memory leak?

I am curious if what you are seeing is a leak. Dynamically updating the page will consume memory. The trick is whether or not IE gives it back when the page refreshes. Are you only seeing this "leak" in your module or does it also occur in my HelloAJAX module (after my fix)? If so, then could you please provide specifics behind what you are calling a leak? Also could you specify what you mean by "it did not work as well as I expected". Did it help things?

12/15/2005 4:42 PM

	Michael wang
3 posts

Re: Why AJAX has a memory leak?

Maybe i didn't tell you clearly. I commented all my code for parsing the result string and assigning value to html controls, only left the callback caller and the timer function. Afterward I checked the memory used in windows task manager and found the memory increased slowly. After some minutes, the memory Definitely increased 1M. Maybe this is not called memory leak. What i was expected is that the mory is not changing as the function works, because i think after i parsed the result string the used memory of all member variables in the function is must be released. I'm not claer for the working function of JS engine, so...

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