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Drag and Drop for Data Storage (not actually changing the data in the grids)

Is there a way to utilize the drag and drop functionality without actually moving rows? I have two grids and I want to be able to drag from one to the other to indicate that certain data should get updated (based on which rows are dragged and dropped over which other rows). Is there a way to do this?

Thanks.

There is onDrag event in grid , it occurs when row was draged and released on potential target, but before row really was moved. 
You can use code as

grid.attachEvent("onDrag",function(sid,tid){
          //sid - id of draged row
          //tid - id of drop target
          .... any custom logic here ..
 
          return false; //block real moving
});

Thanks.  How would it work if multiple rows were dragged?

In case of multiselection sid will contain the list with ids of dragged items and "return false" will block moving of all items