Method constructor

src/aria/combobox/combobox-widget.ts:43–57

()

  private _observer: MutationObserver | undefined;

  constructor() {
    const el = this.element;
    this._observer = new MutationObserver(mutations => {
      for (const mutation of mutations) {
        if (mutation.attributeName === 'id') {
          this.popupId.set(el.id);
        }
      }
    });

    this._observer.observe(el, {
      attributes: true,
      attributeFilter: ['id'],
    });
  }

  ngOnInit() {
    this.popupId.set(this.element.id);