beforeDrag

fires before dragging of an item has started

beforeDrag: (data: object, events: MouseEvent, ghost: HTMLElement) => void | boolean;

Parameters:

• data: object - data object. It 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
• events: MouseEvent - a native HTML event object
• ghost: HTMLElement - an HTML element

Returns:

Return false to block dragging of an item; otherwise, true.

Example

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

Related sample: Tree. Events

Change log:

added in v7.0