Action on close

Hi, All,
We need to invoke a clean-up action on the server-side when the browser window is being closed. Now we open a new window in onUnload() event and do the clean-up request from there.
But in latest version of IE user can disable opening of new window. Any other possibilities to do this?

Not on the client side. Also the window will notopen if they have pop up blockers installed.
You are going to have to deal with it on server side.

Well, if you really want to handle it with JavaScript, than here is the solution:
<BODY ONUNLOAD="f1()">
<SCRIPT>
function f1(){
document.myform.submit();
alert("You are about do leave the page");
}
</SCRIPT>
<FORM NAME="myform" ACTION="http://some.cleanup.url/cleanIt">
<INPUT TYPE="HIDDEN" VALUE="true" NAME="closing">
</FORM>
</BODY>
An alert needed there to create a time delay, otherwise browser (I had that with IE) may close before submiting a form.
the form will be submitted and handles by a server.
Aside from that,
I would really suggest you to consider some server side solution. For example, using J2EE, I would use reasonable session timeout and session listener implementation to perform your cleanup task.

Guys,
thanks for your answers,
I'm aware that the clean-up may be done on the server-side via the session timeout, but it's not the desired behavior.
Showing the alert dialog will not be accepted either.

By the way Serge, how are you going to handle power interruption in a client neiborhood?
Also, you might wanna think about that "Reset" and "On/Off" buttons on computer, Task Manager, user not closing a browser, but dragging another file into it and so on

Hi Yuriy,
I didn't say we were going to use clean-up ONLY if invoked from client. The session & stateful session beans do have a timeout as well, but it's more convenient to do it as soon as the client closed the browser.
Suppose we have a concurrent license software purchased for 2 clients and
the client session timeout is 8 hours (a real requirement).
Nothing perfect, even can't be sure that ejbRemove() will be called