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Show preloader message when page is unloading

/ Published in: JavaScript
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This works cross browser. Merely using onclick on a submit button to show a preloader/ please wait dialog doesn't work in IE since it doesn't show images once the page is being unloaded.

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Copy this code and paste it in your HTML 
  1. <script type="text/javascript" src="https://github.com/malsup/blockui/raw/master/jquery.blockUI.js"></script>
  2.     <script type="text/javascript">
  3.         $(document).ajaxStop($.unblockUI);
  4.         $(document).ready(function () {
  5.             $('#lnkBtnPrevious').click(function () {
  6.                 $.blockUI();
  7.             });
  8.  
  9.             $('#lnkBtnContinue').click(function () {
  10.                 if (typeof (Page_ClientValidate) == 'function') {
  11.                     Page_ClientValidate();
  12.                 }
  13.                 if (Page_IsValid) {
  14.                     $.blockUI();
  15.                 }
  16.  
  17.             });
  18.         });
  19.     </script>

URL: http://jquery.malsup.com/block/

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