Method subscribeToNavigationEvents

packages/router/src/router.ts:193–255

()

  private eventsSubscription = new Subscription();
  private subscribeToNavigationEvents() {
    const subscription = this.navigationTransitions.events.subscribe((e) => {
      try {
        const currentTransition = this.navigationTransitions.currentTransition;
        const currentNavigation = untracked(this.navigationTransitions.currentNavigation);

        if (currentTransition !== null && currentNavigation !== null) {
          this.stateManager.handleRouterEvent(e, currentNavigation);
          if (
            e instanceof NavigationCancel &&
            e.code !== NavigationCancellationCode.Redirect &&
            e.code !== NavigationCancellationCode.SupersededByNewNavigation
          ) {
            // It seems weird that `navigated` is set to `true` when the navigation is rejected,
            // however it's how things were written initially. Investigation would need to be done
            // to determine if this can be removed.
            this.navigated = true;
          } else if (e instanceof NavigationEnd) {
            this.navigated = true;
            this.injectorCleanup?.(this.routeReuseStrategy, this.routerState, this.config);
          } else if (e instanceof RedirectRequest) {
            const opts = e.navigationBehaviorOptions;
            const mergedTree = this.urlHandlingStrategy.merge(
              e.url,
              currentTransition.currentRawUrl,
            );
            const extras = {
              scroll: currentTransition.extras.scroll,
              browserUrl: currentTransition.extras.browserUrl,
              info: currentTransition.extras.info,
              skipLocationChange: currentTransition.extras.skipLocationChange,
              // The URL is already updated at this point if we have 'eager' URL
              // updates or if the navigation was triggered by the browser (back
              // button, URL bar, etc). We want to replace that item in history
              // if the navigation is rejected.
              replaceUrl:
                currentTransition.extras.replaceUrl ||
                this.urlUpdateStrategy === 'eager' ||
                isBrowserTriggeredNavigation(currentTransition.source),
              // allow developer to override default options with RedirectCommand
              ...opts,
            };

            this.scheduleNavigation(mergedTree, IMPERATIVE_NAVIGATION, null, extras, {
              resolve: currentTransition.resolve,
              reject: currentTransition.reject,
              promise: currentTransition.promise,
            });
          }
        }

        // Note that it's important to have the Router process the events _before_ the event is
        // pushed through the public observable. This ensures the correct router state is in place
        // before applications observe the events.
        if (isPublicRouterEvent(e)) {
          this._events.next(e);
        }
      } catch (e: unknown) {