Method on

src/dd-gridstack.ts:186–196

(el: GridItemHTMLElement, name: string, callback: DDCallback)

  }

  public on(el: GridItemHTMLElement, name: string, callback: DDCallback): DDGridStack {
    this._getDDElements(el).forEach(dEl =>
      dEl.on(name, (event: Event) => {
        callback(
          event,
          DDManager.dragElement ? DDManager.dragElement.el : event.target as GridItemHTMLElement,
          DDManager.dragElement ? DDManager.dragElement.helper : null)
      })
    );
    return this;
  }

  public off(el: GridItemHTMLElement, name: string): DDGridStack {
    this._getDDElements(el).forEach(dEl => dEl.off(name));