onBeforeDrop

fires before an item is dragged to another target and the mouse button is released, cancelable

id	string|number	the item's id
pId	string|number	the parent's id
index	number	the new item's index

boolean

true to allow operation

Example

myTreeView.attachEvent("onBeforeDrop", function(id, pId, index){
    // your code here
    return true;
});

the event is blockable: return false to block the item's dropping

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