Drag & Drop

HI!, im building a tree and a grid where i need to drag from grid to tree.

I need to catch the event “before drop” on tree…because i need to validate the the Tree Node where tjhis Drop is going to happend.

How can i solve this?


You can use next code
       //this event occurs before drop, when item dragged over potential target
       // tid - id of tree item or null if item draged over free space of tree
       if (!some_rule_check(tid)) return false; // block d-n-d
       return true;