Prototype - stopObserving() Method

Quiz

This method unregisters handler and returns element.

Syntax

element.stopObserving(eventName, handler);

Return Value

Returns an HTML element.

Example

<html>
   <head>
      <title>Prototype examples</title>
      <script type = "text/javascript"src = "/javascript/prototype.js"></script>
      
      <script>
         function handler(event) {
            alert(Event.element(event).innerHTML);
         }
         function RegisterFunction() {
            $('test').observe('click', handler );
            alert("Registering the handler");
         }
         function UnRegister() {
            $('test').stopObserving('click', handler);
            alert("Now unregistering the handler");
         }
      </script>
   </head>

   <body onload = "RegisterFunction();">
      <p id = "test">Click me to see the result.</p>
      <br />
      <p>Click the button to unregister the handler.</p>
      <input type = "button" value = "UnReg" onclick = "UnRegister();"/>
   </body>
</html>

Output

prototype_element_object.htm

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