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Fire function before close

Posted on 2008-10-29
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Last Modified: 2012-05-05
I'm trying to get some javascript to run before the user closes the form, and I'm using onbeforeunload, but it's firing on postbacks, in addition to when the form closes.  

Is there a way to get this script to only fire when the form is about to be closed.
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Question by:ARACK04
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sh0e earned 500 total points
ID: 22837536
Not really.  You can check for window.event.clientY < 0.  This will still catch the X button.  

However, if you simply want to warn the user that they will lose data if they close the window, it may be better to use a flag that determines if there is data that has been changed.
Or, what you can do, is whenever you postback or navigate or anything else you don't want it to fire, you set a flag that prevents the confirmation from popping up.

<a href="http://google.com" onclick="flag=false;">link 1</a>

<form onsubmit="flag=false;">

<input type="submit"></input>

</form>
 

<script>

flag=true;

window.onbeforeunload = function(){if(flag)return "are you sure?";};

</script>

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