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Prototype observe () Method

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This method registers an event handler on element and returns element.

Syntax:

element.observe(eventName, handler[, useCapture = false]);

Return Value:

An HTML element.

Example:

<html>
<head>
<title>Prototype examples</title>

<script type="text/javascript" 
   src="/javascript/prototype.js">
</script>
<script>

function RegisterFunction()
{

   $('test').observe('click', function(event){
      alert(Event.element(event).innerHTML);
   });

}

</script>
</head>

<body onload="RegisterFunction();">

  <p id="test">Click me to see the result.</p>

</body>
</html>

To understand it in better way you can Try it yourself.

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