How to know where a node was dropped?

Thank you I am doing something drag and drop on chart is that possible to know drop position I need calculate somehow drop position

Implement a “SelectionMoved” DiagramEvent listener and look at the Node.location of each Node in the Diagram.selection.
GoJS Events -- Northwoods Software

If the drag-and-drop is between diagrams, implement an “ExternalObjectsDropped” DiagramEvent listener:
GoJS Events -- Northwoods Software

Or maybe both, depending on what you want.