Is there a way to determine that the browser window was closed?

Question

How is it possible to identify that the browser\'s close button was clicked?

Answer 1

You should use onbeforeunload, not onunload. IE 7 (and perhaps other browsers) are not 100% reliable when it comes to firing the unload event, but it seems to always fire the beforeunload event.

for example:

window.onbeforeunload=function(){}

or, if you are using prototype.js:

Event.observe(window, 'beforeunload', function(){});