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Prototype Event stopObserving() Method

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This method unregisters an event handler.

This function is called with exactly the same argument semantics as observe. It unregisters an event handler, so the handler is not called anymore for this element+event pair.

Syntax:

Event.stopObserving(element, eventName, handler
                             [, useCapture = false])

Here is explanation about passed parameters:

Return Value :

Example:

This example shows how it reacts only once click and after that programm stops observing.

<html>
<head>
<title>Prototype examples</title>
   <script type="text/javascript" 
   src="/javascript/prototype.js">
   </script>
<script>

// Register event 'click' and associated call back.
Event.observe(document, 'click', respondToClick);
  
// Callback function to handle the event.
function respondToClick(event) {
  alert("Left button is pressed...." );
  Event.stopObserving(document, 'click', respondToClick);
}
</script>
</head>

<body>

   <p id="note">Click anywhere to see the result.</p>

   <p id="para1">This is paragraph 1</p>

   <p id="para2">This is paragraph 2</p>

   <div id="division">
       This is divsion.
   </div>

</body>
</html>

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


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