Angular 2 displayed a vibrant HTML page component

In my project, there is an Isotope Component that I want to keep protected from unauthorized access. If a user is not logged in and tries to navigate directly to the Isotope page by entering a specific route like:

http://localhost:4200/register

and then proceeds to enter:

http://localhost:4200/isotopes, the Isotope page should not be displayed but instead briefly flashes the HTML template of the component before redirecting to the login page. I want to make sure that no content is visible during these redirections. Here's a snippet of code related to the Isotope component: I am unsure about which part of the code might be causing this issue.

export class IsotopesComponent implements OnInit {
theisotopes: IsotopesComponent[];
selectedIsotope: IsotopesComponent;

  constructor( private isotopesService: IsotopesService,
               private authService: AuthService,
               private routetheuser: Router) { }

  ngOnInit() {
    this.getIsotopes();
  }
  getIsotopes() { this.isotopesService.getIsotopes()
                .then((isotopes ) => {
                   this.theisotopes = isotopes;
                   //console.log(this.theisotopes)
                })
                .catch((err) => {
                  this.routetheuser.navigate(['/login']);
                  });
  }// getIsotopes
}// class

Answer №1

My belief is that the flashing of the templates occurs due to the absence of a safeguard on the route. After implementing canActivate for the route, it verifies if the user is authenticated before rendering the component. If authentication fails, the component will not be displayed.

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