If you need to display a confirmation before the user closes the window, you can use the beforeunload event of the window object to display a confirmation message.
JavaScript
function AddUnloadHandler()
{
AddEventHandler(window, 'beforeunload', HandleUnload);
}
function HandleUnload() {
var strConfirm = 'Please make sure you saved your changes before
closing the page.';
if (document.all) {
window.event.returnValue = strConfirm;
}
else {
alert(strConfirm);
var evnt = arguments[0];
evnt.stopPropagation();
evnt.preventDefault();
}
}
ASPX
<body onload="AddUnloadHandler()">
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