On Fri, 31 Aug 2001, Pierre-Yves Saumont wrote:
> >> I tried with setting the window.location property, but didnt worked.
> >> Plus i tried with <BODY> tag, but the problem is the MyUnload() is
> >> called, but the form submit or servlet redirection is not
> >> happening... ???
> >>
> >> <BODY onbeforeunload='MyUnLoad()'>
> >>
> >> I will make my problem more clearer...
> >> I want whenever a browser window is closed a servlet should be
> >> called which does some cleaning-up/post processing operation... !!
> >[ ... ]
>
> >This has come up a hundred times before -- check the archives. Bottom
> >line, it can't be done 100% reliably, so you're going to need to rely
> >on a timeout mechanism.
>
> Hundreds of times with no 100� reliable solution proposed, I agree.
>
> However, the argument are always the same, stating that HTTP
> protocole doesn't allow for this. What we have to do is just to
> build over HTTP an addtionnal layer that does the job. This can be
> done by including in the generated HTML a component that will keep
> permanent contact with the server through HTTP. Of course,
> "permanent" means only at regular interval, such as 20 secondes (or
> whatever you want). On the server side, you just have to monitor the
> requests from that component. If the requests stop to reach the
> server, it means that the client has gone. It works event in case of
> a client crash or power down. It's 100% reliable, but it has two
> drawbacks : wasting bandwith and excluding clients which can't or
> doesn't want to handle your component. Such component can be a java
> applet or a Flash movie.
So, in other words, it's not 100% reliable, eh? :-)
Milt Epstein
Research Programmer
Software/Systems Development Group
Computing and Communications Services Office (CCSO)
University of Illinois at Urbana-Champaign (UIUC)
[EMAIL PROTECTED]
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