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dhtmlxdataview
Events

## onBeforeDrop Event

Parameters:

- context object

* context.start - ID of an item, from which drag process was started

      * context.source - array of dragged IDs (drag source)
      * context.target - ID of target item (drop target)
      * context.from - view object, to which dragged item belongs
      * context.to - view object, to which drop target belongs
      * context.index - index in the target view, at which new item will be added
      * context.new_id - id which will be used for the moved item ( actual only while moving between different views)
    * native html event

      view.attachEvent("onBeforeDrop", function (context,e){
           //any custom logic here
           return true;
      });

Event is blockable, if non-true value returned from custom method, default reaction will be blocked