Activating OnBeforeUnload ONLY when field values have changed

Question

What I\'m trying to achieve is to Warn the user of unsaved changes if he/she tries to close a page or navigate away from it without saving first.

I\'ve managed to g

Answer 1

$(window).bind('beforeunload',function() {
 return "'Are you sure you want to leave the page. All data will be lost!";
});

$('#a_exit').live('click',function() {
    $(window).unbind('beforeunload');
});

Above works For me.