Rails spinoffs - Apr 2006 - Draggable - how start action on start dragging and end action on droppping

Hi all. I have got situation that I made element draggable - and 
when element is dragged I want to start some action (e.g. shown 
AJAX indicator, and change one of CSS class in dragging element). 
What is the best way to achieve this? I search source code of the 
Draggable and I saw that there is 2 method: Draggable.initDrag 
and Draggable.endDrag so it looks like in initDrag method i 
should call my own function which do the fing and in endDrag 
method I should call my own function which cancel behaviour of 
preview function. Is it better way to do it?

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Am Sonntag, 30. April 2006 22:19 schrieb Grzesiek
Slusarek:
> Hi all. I have got situation that I made element draggable - and
> when element is dragged I want to start some action (e.g. shown
> AJAX indicator, and change one of CSS class in dragging element).
> What is the best way to achieve this? I search source code of the
> Draggable and I saw that there is 2 method: Draggable.initDrag
> and Draggable.endDrag so it looks like in initDrag method i
> should call my own function which do the fing and in endDrag
> method I should call my own function which cancel behaviour of
> preview function. Is it better way to do it?
Hello,

for the draggables i use starteffect and endeffect (basically that''s 
onDragStart and onDragEnd in other frameworks). You can overwrite the methods 
when you create the object. The Wiki lacks a code example, but it works the 
same way as in the Droppable example.  
http://wiki.script.aculo.us/scriptaculous/show/Droppables.add

However, as for the AJAX indicator there is a built-in mechnism called 
Ajax.Responders. It''s some kind of global AJAX activity monitor.
Excellent
stuff. :)
Here''s an example, i''m sure you get the idea:
//-------------------------------------
  Ajax.Responders.register({
    onCreate: function() {
      if(Ajax.activeRequestCount > 0)
        Element.show(id);
    },
    onComplete: function() {
      if(Ajax.activeRequestCount == 0)
        Element.hide(id);
    }
  });
//-------------------------------------

Best Regards,
Dirk Eschler

-- 
Dirk Eschler <mailto:dirk.eschler-hi6Y0CQ0nG0@public.gmane.org>
http://www.krusader.org