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I have a YUI application. Under certain circumstances I want to alert the user before he closes the window. Therefore I capture the window close event and do
onWindowClose: function(e) { if (...) { YAHOO.util.Event.preventDefault(e); } } The browser shows a standrd message: ‘Are you sure you want to navigate away from this page? Press OK to continue, cancel to stay in the current page’.
How can I customize the message the browser shows?
Check for onbeforeunload event and my answer in
show a message box when user close IE
and
ASP.NET: Warning on changed data closing windows
It may work for you.