onBeforeDrag

fires before the drag operation started

context	object	context object
ev	Event object	native event object

boolean

true - to trigger the default action, false - to block it

Example

myDataView.attachEvent("onBeforeDrag", function (context, ev){
    // your code here
    return true;
});

possible context object values:

• context.start - ID of an item from which the dragging process started;
• context.source - array of the dragged IDs (drag source);
• context.html - this property can be set to redefine the content of the drag-marker;
• context.from - an object to which the dragged item belongs.

The event is blockable, returning false will block the default action.

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