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beforeDrop

fires before the user has finished dragging an item and released the mouse button

beforeDrop: (data: IDragInfo, events: MouseEvent) => void | boolean;

Parameters:

  • data: object - data object
  • events: MouseEvent - a native HTML event object

Returns:

Return false to block the default action; otherwise, true.

Example

tree.events.on("BeforeDrop", function(data, events) {    // your logic here    return false;});

Related sample: Tree. Events

The data object can contain the following parameters:

start(string, number) the id of an item, from which the dragging process has started
source(array) an array with ids of dragged items
target(string, number) the id of a potential target item

Change log:

added in v7.0