This callback function is called when a drag is in progress. This is the preferred callback for drag event.
new Draggable('element', {change: 'effectFunction'});
Here effectFunction is function which defines effect to be applied.
<html> <head> <title>Draggables Elements</title> <script type="text/javascript" src="/javascript/prototype.js"></script> <script type="text/javascript" src="/javascript/scriptaculous.js"></script> <script type="text/javascript"> window.onload = function(){ new Draggable('myimage', { change : function(){ new Effect.Opacity('myimage', {from:0, to:1.0, duration:1});} }); } </script> </head> <body> <p>While you drag this image it become disappear.</p> <img id="myimage" src="/images/scriptaculous.gif"/> </body>
To understand it in better way you can Try it yourself.
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