Angular（5）-成功登录后，登录按钮未更改为注销

Question

I'm using Auth0's API to handle user management. Everything is working as intended - On Login() it properly stores local. On Logout() it properly removes them.

However, the actual Login button is not becoming Logout automatically on success - It is when I hard-refresh the page, but not directly. I believe this is an issue with my binding?

Header component

  authenticated: boolean; // Wasn't sure how else to filter in front-end

  constructor(private authService: AuthService) { }

  ngOnInit() {
    this.authenticated = this.authService.isAuthenticated()
  }



  login() {
    this.authService.login();
  }

  logout() {
    this.authService.logout();
  }

}

HTML For Header

  <li class="nav-item">
    <a class="nav-link waves-light" *ngIf="!authenticated" mdbRippleRadius (click)="login()"><i class="fa fa-user"></i> <span class="clearfix d-none d-sm-inline-block">Log In</span></a>
    <a class="nav-link waves-light" *ngIf="authenticated" mdbRippleRadius (click)="logout()"><i class="fa fa-user"></i> <span class="clearfix d-none d-sm-inline-block">Log Out</span></a>
  </li>

The docs said to use auth.isAuthenticated() which would call the function from the service

  public isAuthenticated(): boolean {
    // Check whether the current time is past the
    // access token's expiry time
    const expiresAt = JSON.parse(localStorage.getItem('expires_at'));
    return new Date().getTime() < expiresAt;
  }

I was thinking perhaps I should append this.authenticated = this.authService.isAuthenticated() to the end of each login()/logout() function in the header component, but I'm feeling like I'm going the wrong direction with this.

Welcome any input.

Update

Modifying logout() to call this.authenticated = this.authService.isAuthenticated() did resolve the issue for it, but Login is still not becoming Log Out until I refresh the page.

Answer 1

You can write authenticated as a property getter:

public get authenticated(): boolean {
    return this.authService.isAuthenticated();
}

Answer 2

From what I can see you're only updating your variable on init. That's why you only see the changes when you refresh. If you do

login() {
this.authService.login();
this.authenticated = this.authService.isAuthenticated()
  }

Inside the login method it should work.