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Building a Full-stack Application Using the MEAN Stack

Implementing User Authentication Status in the Navbar

Learn to implement authentication status in Angular.

We'll cover the following...

In this lesson, we’ll implement the functionality that shows the authentication status of a user in the navbar. If the user is logged in to the application, the navbar will have the following items:

If the user is logged out of the application, the navbar status will show the nav item in the image below:

Implementing the logic for the navbar status

To set up the navbar logic in our application, we use the code below:

TypeScript 3.3.4
import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { Router } from '@angular/router';
@Injectable({
  providedIn: 'root',
})
export class UserService {
  private baseURL = ' https://course-mgt-app.herokuapp.com';
  constructor(private http: HttpClient, private router: Router) {}
  registerUser(user: any) {
    return this.http.post(`${this.baseURL}/api/register`, user);
  }
  loginUser(user: any) {
    return this.http.post(`${this.baseURL}/api/login`, user);
  }
  get isLoggedIn(): boolean {
    const user = localStorage.getItem('token') as string;
    return user !== null ? true : false;
  }
  logoutUser() {
    localStorage.removeItem('token');
    this.router.navigate(['/home']);
  }
}

Below is a summary of the code above:

  1. We begin implementation from the user.service.ts file by importing the Angular router in line 3.

  2. Next, we inject the router as a private variable in the constructor in line 10. ...