Alert when browser window closed accidentally

Question

I have a chat application, I want that whenever user accidentally or manually closes the browser ,he should get an alert so that various clean up operations could be carried out. I have more thing i itried to use on before event but I want that to be used for a particular web page as all other web pages are also called on before load. Please help

Answer 1

This is not really a JQuery thing, I use this functions:

function setConfirmUnload(on) {     window.onbeforeunload = (on) ? unloadMessage : null; }  function unloadMessage() {     return "Are you sure you want to leave this page"; } 

Then, at any time you can call

setConfirmUnload(true) to enable the confirmation or false if you want to allow them to close the screen without a warning (if you have a close button for instance).