I am just wondering if it is possible to detect if the window is asked to being closed by clicking on the "X" button on the browser? So before the window is actually close, i would like to do something first. Is it possible?

oddly enough it would be window.onclose

or window.onunload

Originally Posted by chrishirst

oddly enough it would be window.onclose

or window.onunload

Is there a big difference between window.onunload or window.onclose?

onunload is an "interstitial" event when one document is unloaded and another is being loaded, and onclose is when the window is closing completely.

Ok got it! Thanks