javascript - Creating a browser Exit popup -

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what want detecting browser close event(on browser unload) , open new pop have options (give feedback, go page again , mail me report etc). @ same time want parent window alive till user select option in pop window. tried following , seems not working.

$(window).bind('beforeunload', function(event){         event.preventdefault();     });

please give me right direction achieving this.

you can alert/dialog 

$(window).bind('beforeunload', function(event){     return "hold on minute there, conme , answer questions"; });

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