Method ngOnInit

src/cdk/tree/tree.ts:1392–1405

()

  }

  ngOnInit(): void {
    this._parentNodeAriaLevel = getParentNodeAriaLevel(this._elementRef.nativeElement);
    this._tree
      ._getExpansionModel()
      .changed.pipe(
        map(() => this.isExpanded),
        distinctUntilChanged(),
        takeUntil(this._destroyed),
      )
      .pipe(takeUntil(this._destroyed))
      .subscribe(() => this._changeDetectorRef.markForCheck());
    this._tree._setNodeTypeIfUnset(this._type);
    this._tree._registerNode(this);
  }

  ngOnDestroy() {
    // If this is the last tree node being destroyed,