onListBeforeDrop

fires before a dragged element is released over the droppable list

Example

$$("myBoard").attachEvent("onListBeforeDrop", function(context,ev,list){
    if(...){
        return false;
    }
    return true;
});

The properties of the context object are:

• 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 drop on empty space
• start - the ID from which drag-n-drop started
• index - the index of the item in the column
• x_offset - the left offset between the pointer and the dragged list
• y_offset - the top offset between the pointer and the dragged list