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   1  /**
   2   * Generic function to add an event handler to any DOM element.
   3   *
   4   * $Horde: horde/js/addEvent.php,v 1.1.2.2 2006/01/01 21:29:02 jan Exp $
   5   *
   6   * Copyright 2005-2006 Chuck Hagenbuch <chuck@horde.org>
   7   *
   8   * See the enclosed file COPYING for license information (LGPL). If you
   9   * did not receive this file, see http://www.fsf.org/copyleft/lgpl.html.
  10   */
  11  
  12  /**
  13   * Adds the given event to an element. If the element already has
  14   * handlers for the event, the new event is appended.
  15   *
  16   * @param object element   The element to add the event to.
  17   * @param string event     The name of the event.
  18   * @param string|function function  The javascript to execute.
  19   */
  20  function addEvent(element, event, code)
  21  {
  22      if (!element) {
  23          return false;
  24      }
  25  
  26      // Assign new anonymous function if we're passed a js string
  27      // instead of a function reference.
  28      if (typeof code == 'string') {
  29          code = new Function(code);
  30      }
  31  
  32      if (element.addEventListener) {
  33          element.addEventListener(event.replace(/on/, ''), code, false);
  34      } else if (element.attachEvent) {
  35          element.attachEvent(event, code);
  36      } else if (element.onload != null) {
  37          eval('var OldEvent = element.' + event);
  38          newCode = Function(e)
  39          {
  40              oldEvent(e);
  41              code();
  42          };
  43          eval('element.' + event + ' = newCode');
  44      } else {
  45          eval('element.' + event + ' = code');
  46      }
  47  
  48      return true;
  49  }