如果用户已登录，则角度重定向到仪表板

Question

I am using Angular v6, I have implement redirect from dashboard to login page if user is not logged in.
I'm confused between the two options:

1. Add a login guard file to check login status and redirect to dashboard
2. Detect route changing event, check login status here and redirect
   

What is the better solution for this case ?

Answer 1

Use Authentication Guard in your routing module It will make things easy for you to check whether a user is login or not

For a better understanding of Auth Guard here are some links that might help you :

http://jasonwatmore.com/post/2018/05/23/angular-6-jwt-authentication-example-tutorial

How to use angular 6 Route Auth Guards for all routes Root and Child Routes?

https://medium.com/@ryanchenkie_40935/angular-authentication-using-route-guards-bf7a4ca13ae3

https://scotch.io/courses/routing-angular-2-applications/canactivate-and-canactivatechild

Here is my code that I used in my project!

In-app module file I used auth guard like this :

const ROUTES = [
  { path: '', redirectTo: 'home', pathMatch: 'full' },
  { path: 'login', component: LoginComponent },
  { path: 'register', component: RegisterComponent },
  { path: 'home', component: HomeComponent },
  { path: 'books', component: BookComponent,canActivate:[AuthGuardService] },
  { path: 'book-details/:id', component: BookDetailComponent,canActivate:[AuthGuardService] },
  { path: 'book-create', component: BookCreateComponent,canActivate:[AuthGuardService] },
];

And here is my auth guard service :

import { Injectable } from '@angular/core';
import { Router, CanActivate } from '@angular/router';


@Injectable()
export class AuthGuardService implements CanActivate {

    constructor( public router: Router) { }

    canActivate(): boolean {

        if (sessionStorage.getItem('id') == null) {
            this.router.navigate(['home']);
            return false;
        }
        return true;
    }
}

This is how you can implement auth guard in your code.

Answer 2

Using guard is good option.

Please check link

http://jasonwatmore.com/post/2018/05/16/angular-6-user-registration-and-login-example-tutorial