popup message on closing browser

Question

When I am closing my browser I want a confirmation message.     I am using   window.onbeforeunload = confirmExit;
function confirmExit() {
return "You will Lost this test. Are you sure you want to exit this page?";
}   But this  function is also working on page postback on my page. I want this message on window cclose only What should I have to do.????

Khargesh Rajput · Answer

Solved
use
OnClientClick="needToConfirm = false;"  on controls on page
and
javascript fun is
var needToConfirm = true;
window.onbeforeunload = confirmExit;
window.onload = confirmExit = false;
function confirmExit() {
if (needToConfirm)
return "You are Ending the test.  Are you sure you want to exit this  page?";
}

Khargesh Rajput · Answer

Not working.

Joginder Banger · Answer

try this one
$(window).unload(function() {
var answer = confirm("Are you sure?")
if (answer){
alert("Bye bye!") }
else{ alert("Thanks for sticking around!") }
});