Method constructor

packages/router/src/directives/router_link.ts:376–419

(
    private router: Router,
    private route: ActivatedRoute,
    @Attribute('tabindex') private readonly tabIndexAttribute: string | null | undefined,
    private readonly renderer: Renderer2,
    private readonly el: ElementRef,
    private locationStrategy?: LocationStrategy,
  )

  private readonly reactiveRouterState = inject(ReactiveRouterState);

  constructor(
    private router: Router,
    private route: ActivatedRoute,
    @Attribute('tabindex') private readonly tabIndexAttribute: string | null | undefined,
    private readonly renderer: Renderer2,
    private readonly el: ElementRef,
    private locationStrategy?: LocationStrategy,
  ) {
    const tagName = el.nativeElement.tagName?.toLowerCase();
    this.isAnchorElement =
      tagName === 'a' ||
      tagName === 'area' ||
      !!(
        // Avoid breaking in an SSR context where customElements might not
        // be defined.
        (
          typeof customElements === 'object' &&
          // observedAttributes is an optional static property/getter on a
          // custom element. The spec states that this must be an array of
          // strings.
          (
            customElements.get(tagName) as {observedAttributes?: string[]} | undefined
          )?.observedAttributes?.includes?.('href')
        )
      );

    if (typeof ngDevMode !== 'undefined' && ngDevMode) {
      effect(() => {
        if (
          isUrlTree(this.routerLinkInput()) &&
          (this._fragment() !== undefined ||
            this._queryParams() ||
            this._queryParamsHandling() ||
            this._preserveFragment() ||
            this._relativeTo())
        ) {
          throw new RuntimeError(
            RuntimeErrorCode.INVALID_ROUTER_LINK_INPUTS,
            'Cannot configure queryParams or fragment when using a UrlTree as the routerLink input value.',
          );
        }
      });
    }
  }

  /**
   * Modifies the tab index if there was not a tabindex attribute on the element