fires before the mouse button is pressed and the cursor is moved over a panel

boolean onBeforeDrag(object context,Event native_event){ ... };


contextobjectthe drag-n-drop context
native_eventEventan HTML event object


booleanreturning false will prevent dragging of the element


    view:"dashboard", id:"dashboard",
        { view:"panel", x:0, y:0, dx:1, dy:1,
          body:{ template:"Draggable"}, drag:true },
        { view:"panel", x:1, y:0, dx:2, dy:1,
          body:{ template:"Non-draggable"}, drag:false }
$$("dashboard").attachEvent("onBeforeDrag", function(context, native_event){
    //returning false will block dragging for some panels
    return context.source.config.drag;

Related samples


If you drag multiple items, the event will be called once for the entire batch of items.

The drag-and-drop context can have the following properties:

  • from - the source object
  • to - the target object
  • source - the ID of the dragged item(s)
  • target - the ID of the drop target, null for dropping on empty space
  • start - the ID from which drag-n-drop was started
See also
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