Behavior memory leak, part 2 
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 Behavior memory leak, part 2

    Does this replicate when behaviors are attached via STYLE tags or CSS.
It is obviously a problem
with the addBehavior and removeBehavior code.  It is possible that IE is
storing state information for
the HTC even thought is is a blank HTC.  100 dynamically created behaviors
can pose quite a memory
problem to a system though and at first thought this should definitely be

    - Justin Rogers, CEO DigiTec Web Consultants

Sat, 08 Jun 2002 03:00:00 GMT  
 Behavior memory leak, part 2
I believe it does. Please see my original


>     Does this replicate when behaviors are attached via STYLE tags or CSS.

Sun, 09 Jun 2002 03:00:00 GMT  
 Behavior memory leak, part 2


I have tried both your examples and can confirm your observations, I see the same thing...

IE5 5.00.2314.1003 (Upd.versions?? q231452;q231450;3717;q240308)
MSHTML 5.00.2314.1000
PWS 4.02.0662

So it's not only NT/2000 ...



> Greetings,

> Could anyone please confirm this and fix before 5.5 release? For me it
> repros on any version of IE 5.5 on NT4 and on IE5 in 2000RC3.

> Each time a behavior is attached and then removed, there is a memory leak
> which is twice the size of the HTC file (the attached ZIP is a working
> sample). The same thing happens I believe when the element is removed from
> the document hierarchy (see the original post below):

> Here are the steps to repro, in case you can't get the attached file.

> (1) Create an empty behavior ( and add more comments to make the
> file, say, 250 KB in size:

>     <SCRIPT>
>     // -- add more comment lines here to increase the size of the file --
>     </SCRIPT>

> (2) Create an HTML page and change extension to HTA (it will help to track
> the process memory):

>     <html><head><script>
>         var id;
>         function doAction() {
>             if (theButton.innerText=="Remove") {
>                 theDiv.removeBehavior(id);
>                 theButton.innerText="Add";
>             }else{
>                 id=theDiv.addBehavior("");
>                 theButton.innerText="Remove";
>             }
>             CollectGarbage();    // this should release all unused memory
>         }
>     </script></head><body>
>     <div id=theDiv>
>         This is the place to which empty behavior is attached
>     </div>
>     <button id="theButton"
>         onclick="doAction()"
>         ondblclick="doAction()"  style="width:200px"
>     >Do it!</button>
>     </body></html>

> (3) Open NT Task manager, notice the process' "Mem Usage" and "VM Size" for
> MSHTA.EXE. Push the button twice. See new process size. Repeat. See the
> process memory growth and calculate the delta for each cycle. Compare to the
> size of the HTC file.

> regards,
> --VS.

> > > Hello,

> > > I am trying to put an element with a behavior on a "popup" DIV. However,
> > > when that div element is destroyed, some memory (20-100 Kilobytes) is
> not
> > > released. Can anybody else reproduce it? What can be done about it?

> > Hi,

> > Yes, this repros on my copy of Windows 2000 Server.

> > My guess is that you are trying to delete the div, but JScript still has a
> > reference to it (after all, you're calling its onclick handler!) so it
> can't
> > be destroyed.

> > Try hiding the div (setting style="display: none") and using a
> setTimeout()
> > call to destroy the div after the event handler has returned.

> > Peter

> > --
> > Peter J. Torr - Microsoft Windows Script Program Manager

> > Please do not e-mail me with questions - post them to this
> > newsgroup instead. Thankyou!

Sun, 09 Jun 2002 03:00:00 GMT  
 [ 3 post ] 

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