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<!DOCTYPE html>
<html>
<head>
<script class="jsbin" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script>
<meta charset=utf-8 />
<title>JS Bin</title>
<!--[if IE]>
  <script src="http://html5shiv.googlecode.com/svn/trunk/html5.js"></script>
<![endif]-->
<style>
  article, aside, figure, footer, header, hgroup, 
  menu, nav, section { display: block; }
</style>
</head>
<body>
  <input type="button" id="test" value="Click me" onclick="alert('intrinsic event attribute');" />
  <input type="button" id="simulate" value="&lt;-- Simulate click" />
</body>
</html>
 
function triggerMouseEvent(element, eventName, userOptions) {
  var options = { // defaults
    clientX: 0, clientY: 0, button: 0,
    ctrlKey: false, altKey: false, shiftKey: false,
    metaKey: false, bubbles: true, cancelable: true
     // create event object:
  }, event = element.ownerDocument.createEvent("MouseEvents");
​
  if (!/^(?:click|mouse(?:down|up|over|move|out))$/.test(eventName)) {
    throw new Error("Only MouseEvents supported");
  }
​
  if (typeof userOptions != 'undefined'){ // set the userOptions
    for (var prop in userOptions) {
      if (userOptions.hasOwnProperty(prop))
        options[prop] = userOptions[prop];
    }
  }
  // initialize the event object
  event.initMouseEvent(eventName, options.bubbles, options.cancelable,
                       element.ownerDocument.defaultView,  options.button,
                       options.clientX, options.clientY, options.clientX,
                       options.clientY, options.ctrlKey, options.altKey,
                       options.shiftKey, options.metaKey, options.button,
                       element);
  // dispatch!
  element.dispatchEvent(event);
}
​
​
// Test
var element = document.getElementById('test'),
    simulate = document.getElementById('simulate');
​
element.addEventListener('click', function (e) {
  alert('event bound with element.addEventListener');
}, false);
​
$('#test').click(function (e) {
  alert('jQuery bound event');
});
​
simulate.addEventListener('click', function (e) {
  triggerMouseEvent(element, 'click', {/* options if needed */});
}, false);
​
​
​
Output

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