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dhtmlxTree

When usng drag-n-drop for multiple nodes, it is there any way to determine the start of the first dropped node and also the end of the last dropped node. I need to do processing of data syncronously and the onDrag event fires for each node.

There is no way to get such info in existing version, next code can be added to tree's initialization to introduce 2 new events

tree._drag_old=tree._drag;
tree._drag=function(){
       this.callEvent("onDragExecStart",[]);
       this._drag_old.apply(this,arguments);
       this.callEvent("onDragExecEnd",[]);
}

with such code you will have onDragExecStart before onDrag calling and onDragExecEnd after last onDrag executed.