This specifies a callback function that is called when a suitable draggable element is dropped onto the drop target.
Droppables.add('element', {onDrop: 'callbackFunction'});
In this example elements are moved into drop area.
<html> <head> <title>Drag and Drop Example</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() { // Make all the images draggables from draggables division. $A($('draggables').getElementsByTagName('img')).each( function(item) { new Draggable( item, { revert: true, ghosting: true } ); } ); Droppables.add( 'droparea', { hoverclass: 'hoverActive', onDrop: moveItem } ); // Set drop area by default non cleared. $('droparea').cleared = false; } // The target drop area contains a snippet of instructional // text that we want to remove when the first item // is dropped into it. function moveItem( draggable,droparea){ if (!droparea.cleared) { droparea.innerHTML = ''; droparea.cleared = true; } draggable.parentNode.removeChild(draggable); droparea.appendChild(draggable); } </script> <style type="text/css"> #draggables { width: 172px; border: 3px ridge blue; float: left; padding: 9px; } #droparea { float: left; margin-left: 16px; width: 172px; border: 3px ridge maroon; text-align: center; font-size: 24px; padding: 9px; float: left; } .hoverActive { background-color: #ffffcc; } #draggables img, #droparea img { margin: 4px; border:1px solid red; } </style> </head> <body> <div id="draggables"> <img src="/images/html.gif"/> <img src="/images/css.gif"/> <img src="/images/xhtml.gif"/> <img src="/images/wml_logo.gif"/> <img src="/images/javascript.gif"/> </div> <div id="droparea"> Drag and Drop Your Images in this area </div> </body> </html>
To understand it in better way you can Try it yourself.
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