angular 2 - how to hide nav bar in some components

Question

I am created nav bar separately in nav.component.html ,how to hide nav bar in some components like login.component.

nav.component.html

Answer 1

I was able to solve this without using a nav/toolbar service by adding a data object to the route in the route.module. I expanded on Todd Motto's example of adding dynamic titles to a page and added toolbar: false/true to the data object in my path. I then subscribed to the router events in my toolbar.component. Using Todd's event listener func, I read the path object and used the boolean value to set the toolbar visible or not visible.

No service needed and works on pagerefresh.

routing module

...
const routes: Routes = [
{ path: 'welcome', component: WelcomeComponent, data: { title: 'welcome', toolbar: false} }, ...];

toolbar.component

constructor(private router: Router, private activatedRoute: ActivatedRoute, public incallSvc: IncallService) {
    this.visible = false; // set toolbar visible to false
  }

  ngOnInit() {
    this.router.events
      .pipe(
        filter(event => event instanceof NavigationEnd),
        map(() => this.activatedRoute),
        map(route => {
          while (route.firstChild) {
            route = route.firstChild;
          }
          return route;
        }),
      )
      .pipe(
        filter(route => route.outlet === 'primary'),
        mergeMap(route => route.data),
      )
      .subscribe(event => {
        this.viewedPage = event.title; // title of page
        this.showToolbar(event.toolbar); // show the toolbar?
      });
  }

  showToolbar(event) {
    if (event === false) {
      this.visible = false;
    } else if (event === true) {
      this.visible = true;
    } else {
      this.visible = this.visible;
    }
  }

toolbar.html

  
    {{viewedPage | titlecase}}