Page unload event

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From: Mike (Mike_at_discussions.microsoft.com)
Date: 11/17/04 

Date: Wed, 17 Nov 2004 12:15:06 -0800

I have a web form in my application that will be used for both viewing and
updating information. I have a requirement that if any data has been changed
on the page and the user attempts to leave the page without saving, the user
gets prompted with a message asking if they want to save changes.

It seemed logical to put any code to handle this in the page unload event,
however the page unload event gets fired every time the page does a post
back, like when the user changes a value in a dropdown list for example.

I attempted to check for IsPostBack, before displaying the save message. But
in that case the save message never gets displayed, even when leaving the
page completely.

Does anyone have any idea how to tackle this problem, or is this an
impossible requirement?

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