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beforeunload-empty-string.html

beforeunload-empty-string.html 294 B
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  1. <html>
    2. 

  2. <body>
    3. 

  3. <script type="text/javascript" charset="utf-8">
    4. 

  4.   // Only prevent unload on the first window close
    5. 

  5.   var unloadPrevented = false;
    6. 

  6.   window.onbeforeunload = function() {
    7. 

  7.     if (!unloadPrevented) {
    8. 

  8.       unloadPrevented = true;
    9. 

  9.       return '';
    10. 

  10.     }
    11. 

  11.   }
    12. 

  12. </script>
    13. 

  13. </body>
    14. 

  14. </html>
    15.