javascript - Disable browser closing while transaction ..? -

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i working on 1 payment getway project boss give me 1 task disable browser closing while transaction process try last 2 days can't done 1 please me ....(jsp/servlet) in advance

dear,

  1. first of keep thing in mind can't prevent user close window or tab.
  2. only can remind him creating alert / confirm box if tries close window or tab.

now, coming point have add event name onbeforeunload using javascript. done : 

window.onbeforeunload = function() {     return 'you have unsaved changes!'; }

thanks & cheers :)


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