valor-software/ng2-bootstrap

import { Component } from '@angular/core';

@Component({
  selector: 'demo-dropdown-state-change-event',
  templateUrl: './state-change-event.html'
})
export class DemoDropdownStateChangeEventComponent {
  text: string;
  onOpenChange(data: boolean): void {
    this.text = data ? 'opened' : 'closed';
  }
}