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window unload event in Opera doesn't work

Posted on 2006-07-03
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Last Modified: 2008-01-09
Hi,

I need to catch the window.unload event in all browsers.  It works in IE, Mozilla, and Firefox, but not in Opera.  

Is there a workaround to this?

This is an urgent question, so hence the large number of points.

Thanks
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Question by:php121
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LVL 26

Expert Comment

by:DireOrbAnt
ID: 17034806
http://www.quirksmode.org/js/events_compinfo.html

Look under unload it says:

In Opera load and unload do not fire when the user uses Back or Forward to enter or leave a page, or when the user closes the window.
This severely hampers the usefulness of the events. When I write a load or unload script to, for instance, adjust the navigation of this site, I want it to run whenever the user enters or leaves the page, and not just when a browser thinks it's appropriate.
Therefore I judge Opera's support Minimal and not Incomplete.
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Author Comment

by:php121
ID: 17034866
Yea, I read that page when I was googling a workaround.  Any ideas for a workaround?
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LVL 26

Expert Comment

by:DireOrbAnt
ID: 17034876
Relying on a client-side unload event is not great in the first place.  Can you give us more detail on what you are trying to do?
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Author Comment

by:php121
ID: 17034947
I am working on a PHP Instant Messenger, and when the chat window is closed, I want the option of emailing the chat log to the user.  
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Expert Comment

by:DireOrbAnt
ID: 17034968
Is the whole system stateless? Hit to a php page and that's it?
If it's not, then you probably have some kind of "Service" running and you can detect disconnects and then send the log.

If it is, you can't rely on it (unload event). What if their internet connection drops?
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Author Comment

by:php121
ID: 17034999
Yea, there is a kind of "service", which is in the form of a contact list that uses AJAX to check for updates to the state of the contact list.  Currently, when a chat is deemed inactive (2 minutes of it being empty - as people can rejoin if they get disconnected from the net), then it sends out the transcripts automatically if the admin has selected this option.  

However, if all users close their contact lists, then there is no "service" running to run a check and send out the emails.  That's why I would like to use javascript to catch the closing of the chat window and then do the transcript emailing at that point instead of waiting for 2 minutes and hoping at least one contact list is open to run the check.

You can check out the system at http://www.php121.com - there is a demo on the front page
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Expert Comment

by:deepaknet
ID: 17035137
Did you check out window.onBeforeUnload event?
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Author Comment

by:php121
ID: 17035409
deepaknet, that only works in Internet Explorer which is worse than onUnload
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Expert Comment

by:Michel Plungjan
ID: 17035812
Workaround for a chat is using TWO windows.
One that checks the other window is closed and then reacts.

Michel
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by:kaliyugkaarjun
ID: 17036910
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LVL 26

Expert Comment

by:DireOrbAnt
ID: 17037308
This still doesn't solve the fact that either of these are not reliable solutions. Is it possible in your system to call a php script on a timer? Like the AT command on Windows? You could run one every say 5 minutes and make your check there. If you make your check server-side, it will be 100% reliable.
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Author Comment

by:php121
ID: 17038968
Hmm, I will try catching the window close event from the main contact list as per what mplungjan said.  I'll update this question when I try it out.
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Accepted Solution

by:
Michel Plungjan earned 500 total points
ID: 17040496
FOr example like this

win = null;
monitorId = "";
function testWin() {  
  if (!win) return
  if (win && !win.closed()) return
  if (win.closed) tellUser()
// OR
  var t = new Date.getTime()
  var min = 60000; // one minute
  if (win && (t-win.timestamp) < min) tellUser(); // you can do timestamp = new Date.getTime() in the chat window..
 
}
function openchat() {
  win = window.open('chat.html','newwin')
  monitorId = setInterval('testWin()',400)
}


and
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by:php121
ID: 17040780
Thanks mplungjan, that works.
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