How to get Route data into App Component in Angular 2

Question

I have defined some route data in my app routing module like below:

    const appRoutes:Routes = [
  {path: '', component: LoginComponent, data:[{PageName:"Login Page"}]}]

I want to get the data globally so that I can use appRoutes in app.component.ts to get the URL redirection related information as below:

export class AppComponent {
  title = 'Welcome';
  constructor(public router: Router, public authenticationService: AuthenticationService) {
    this.router.events.subscribe(event => {
        console.log("Url",event.urlAfterRedirects);
        console.log("Page Name", router[PageName]); //Not working
      }

I tried injecting ActivatedRoute but it's not getting updated after each redirection.

Is there anyway, where I can configure page name and get it in global app.component.ts.

Answer 1

Try to filter and loop your events instead of subscribe

constructor(router:Router, route:ActivatedRoute) {
    router.events
      .filter(e => e instanceof NavigationEnd)
      .forEach(e => {
        this.title = route.root.firstChild.snapshot.data['PageName'];
    });
}

Please check the following working demo: https://plnkr.co/edit/rBToHRaukDlrSKcLGavh?p=info

Answer 2

If you had statically routed using Router object like below:

{
  path: '',
  pathMatch: 'full',
  component: NameComponent,
  data: { variableName: 'variableValue' }
},

On ngOnInit() you can use ActivatedRoute object to recover the data you passed from Router definition:

ngOnInit() {
  this.localVariable = this.route.snapshot.data['variableName'];
}

Obs: I am using Angular 5!

Answer 3

This code was written by Todd Motto (Google Developer Expert) to access route data in a parent component or app component. Works like a gem.

import { ActivatedRoute, NavigationEnd, Router } from '@angular/router'
import { filter, map, mergeMap } from 'rxjs/operators'

constructor(private route: ActivatedRoute, private router: Router) {}

ngOnInit() {
  this.router.events.pipe(
    filter(event => event instanceof NavigationEnd),
    map(() => this.route),
    map(route => {
      while (route.firstChild) route = route.firstChild
      return route
    }),
    filter(route => route.outlet === 'primary'),
    mergeMap(route => route.data)
  ).subscribe(data =>
    console.log('data', data)
  )
}

See: https://ultimatecourses.com/blog/dynamic-page-titles-angular-2-router-events

In his example he is using route data to set the page title in app component.

Why accessing route data in a parent is so complicated I'll never know!

Answer 4

For Angular 5+

This service retrieves data on the current route: (in my case "title")

import { Injectable } from "@angular/core";
import { Router, ActivatedRouteSnapshot } from "@angular/router";

@Injectable()
export class AppRoutingService {

  constructor(private router: Router) { }

  public getRouteTitle(): string {
    return this.getRouteData("title");
  }

  private getRouteData(data: string): any {
    const root = this.router.routerState.snapshot.root;
    return this.lastChild(root).data[0][data];
  }

  private lastChild(route: ActivatedRouteSnapshot): ActivatedRouteSnapshot {
    if (route.firstChild) {
      return this.lastChild(route.firstChild);
    } else {
      return route;
    }
  }
}

Component Logic:

import { Component, OnInit, OnDestroy } from "@angular/core";
import { Router, NavigationEnd } from "@angular/router";

// SERVICES
import { AppRoutingService } from "../../shared/services/app-routing.service";

@Component()
export class NavSubmenuComponent implements OnInit, OnDestroy {
  title: string = "";
  routerEvents: any;

  constructor(private router: Router, private appRoutingService: AppRoutingService ) { }

  ngOnInit() {
    this.title = this.appRoutingService.getRouteTitle();

    this.routerEvents = this.router.events
      .filter(event => event instanceof NavigationEnd)
      .subscribe(() => {
        this.title = this.appRoutingService.getRouteTitle();
      });
  }

  ngOnDestroy() {
    this.routerEvents.unsubscribe();
  }
}

Answer 5

In my case this work for angular 8:

onActivate(outlet) in <router-outlet> will be called automatically every time when the route is activated.

in html

<router-outlet (activate)='onActivate(outlet)' #outlet="outlet"></router-outlet>

in component

onActivate(outlet: RouterOutlet) {
    outlet.activatedRoute.data.pipe(map(data => console.log('Router data', data))).toPromise().then();
  }

Dont forget import

import {RouterOutlet} from '@angular/router';
import {map} from 'rxjs/operators';

Answer 6

If you are willing to wait until the ngAfterViewInit event you can link to the router outlet using viewchild.

i.e.

  @ViewChild('router')
  private routerOutlet: RouterOutlet;

  ngAfterViewInit() {
    this.routerOutlet.activateEvents
      .pipe(
        map(() => this.routerOutlet
          .activatedRouteData
        )
      )
    .subscribe((data) => {
        // Code 
    });
  }

<router-outlet #router="outlet"></router-outlet>