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OverRide or Append to JavaScript onload event

/ Published in: JavaScript
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Copy this code and paste it in your HTML 
  1. function addLoadEvent(func) {
  2.   var oldonload = window.onload;
  3.   if (typeof window.onload != 'function') {
  4.     window.onload = func;
  5.   } else {
  6.     window.onload = function() {
  7.       if (oldonload) {
  8.         oldonload();
  9.       }
  10.       func();
  11.     }
  12.   }
  13. }
  14.  
  15. addLoadEvent(nameOfSomeFunctionToRunOnPageLoad);
  16. addLoadEvent(function() {
  17.   /* more code to run on page load */
  18. });

URL: http://www.webreference.com/programming/javascript/onloads/

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