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jeannie lu

2006-Jan-13 22:53 UTC

[Rails] Capturing the position of a draggable element

I would like to capture the position of a draggable element after it''s 
being dragged, but I am running into problem using several options, such 
as "change", "revert" and "onEnd".  My callback
handler would only fire
when the page loads, and not when the element is dragged. How can I make 
this happen?

<html>
<head>
 <script src="/scriptaculous-js-1.5.1/lib/prototype.js"
 type="text/javascript"></script>
 <script src="/scriptaculous-js-1.5.1/src/scriptaculous.js"
 type="text/javascript"></script>
</head>
<body>
 <table id="a">
   <tr>
    <td>draggable</td>
   </tr>
 </table>
<script type ="text/javascript" language="javascript">
 new Draggable(''a'',{onEnd:alert(this)});
</script>
 </form>
</body>
</html>

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Douglas Livingstone

2006-Jan-14 15:44 UTC

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[Rails] Capturing the position of a draggable element

2006/1/13, jeannie lu <jeannielu@hotmail.com>:> <script type ="text/javascript"
language="javascript">
>  new Draggable(''a'',{onEnd:alert(this)});
> </script>
What that does, is assign the return value of "alert(this)" (probably
false or something) to options.onEnd. A simple way to do what you want
would be:

<script type ="text/javascript" language="javascript">
  new Draggable(''a'',{endeffect:function(){alert(this)}});
</script>

but a more powerful solution would be to create your own object to
handle the dragging, which would look something like this:

var MyDraggable = Class.create();
MyDraggable.prototype = {

    initialize: function (element, options) {
      // script.aculo.us drag and drop
      new Draggable(element, options);
      Draggables.addObserver(this);
    },

    onEnd: function () {

    // your code here

    }

}

hth,
Douglas

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