A callback method that is invoked immediately after the default change detector has checked the directive's data-bound properties for the first time, and before any of the view or content children have been checked. It is invoked only once when the directive is instantiated.
OrderableDirective
Enables array elements to be reordered by dragging and dropping.
Only works for arrays that have at least two elements.
Also detects arrays-within-arrays, and correctly moves either the child array element or the parent array element, depending on the drop targert.
Listeners for movable element being dragged:
Listeners for stationary items being dragged over: