Creating a Navigation Bar in Angular2 to Display After a Successful Login

I want to display the navigation bar after a successful user action.

For instance:

How can I change the "showMenu" property in "AppComponent" from inside the "LoginComponent"? Note: I am utilizing routes.

app.ts:

@Component({
  selector: 'app',
  template: `<div *ngIf="showMenu">
               <fnd-menu-nav></fnd-menu-nav>
             </div>
             <router-outlet></router-outlet>
              `,
  directives: [ROUTER_DIRECTIVES, MenuNavComponent]
})
@RouteConfig([
  { path: '/login', name: 'Login', component: LoginComponent, useAsDefault: true },
  { path: '/welcome', name: 'Welcome', component: WelcomeComponent }
])
export class AppComponent {
  public showMenu : boolean;
}

login.component.ts:

@Component({
  selector: 'fnd-login',
  templateUrl: './fnd/login/components/login.component.html',
  providers: [LoginService]
})
export class LoginComponent {
  /* .. other properties */

  constructor(private _router: Router, private _loginService: LoginService ) {
  }
  /* .. other methods  */
  /* .. other methods  */


  private onLoginSuccessfully(data : any) : void {
    /* --> HERE: Update showMenu in AppComponent to true. How? */
    this._router.navigate(['Welcome']);

  }
}

Is there a better way to approach this design?

Answer №1

If you're looking to create a NavBarComponent in your Angular app and utilize a GlobalEventsManager service, here is how you can go about it:

To start, implement the GlobalEventsManager service with the following code snippet:

import { Injectable } from '@angular/core';
import { BehaviorSubject } from "rxjs/BehaviorSubject";
import { Observable } from "rxjs/Observable";

@Injectable()
export class GlobalEventsManager {

    private _showNavBar: BehaviorSubject<boolean> = new BehaviorSubject<boolean>(false);
    public showNavBarEmitter: Observable<boolean> = this._showNavBar.asObservable();

    constructor() {}

    showNavBar(ifShow: boolean) {
        this._showNavBar.next(ifShow);
    }
}

Next, inject the GlobalEventsManger service into your components like so:

import {GlobalEventsManager} from "./../GlobalEventsManager";

@Component({
  selector: 'fnd-login',
  templateUrl: './fnd/login/components/login.component.html',
  providers: [LoginService]
})
export class LoginComponent {
  /* .. other properties */

  constructor(private _router: Router, private _loginService: LoginService, private globalEventsManager: GlobalEventsManager) {
  }

  private onLoginSuccessfully(data : any) : void {
    this.globalEventsManger.showNavBar(true);
    this._router.navigate(['Welcome']);
  }
}
Then, in your NavBarComponent, subscribe to the showNavBar event using the GlobalEventsManager:

import {Component, OnInit} from "@angular/core";
import {GlobalEventsManager} from "../GlobalEventsManager";
@Component({
    selector: "navbar",
    templateUrl: "app/main/topNavbar/TopNavbar.html"
})

export class TopNavbarComponent  {
    showNavBar: boolean = false;

    constructor(private globalEventsManager: GlobalEventsManager) { 
        this.globalEventsManager.showNavBarEmitter.subscribe((mode)=>{
            this.showNavBar = mode;
        });
        
    }
}
Utilize *ngIf="showNavBar" in your HTML template to control the visibility of the Nav bar. Lastly, ensure the GlobalEventsManager is registered when booting up the app:

import { GlobalEventsManager } from './GlobalEventsManager';
import { TopNavbarComponent } from './TopNavbarComponent';

@NgModule({
    bootstrap: [App],
    declarations: [
        App,
        TopNavbarComponent
    ],
    imports: [
        BrowserModule
    ],
    providers: [GlobalEventsManager]
})
export class AppModule {
}

This approach allows for proper management of events in an Angular application using BehaviorSubject/Observable instead of EventEmitter.

Answer №2

There is an alternative approach that does not rely on event emitters or listeners. I am open to using both methods, depending on the specific requirements of each project.

The concept involves dividing the application into two modules: public (without a navbar) and protected (with a navbar).

The public module consists of all the public routes:

// Public Module
import { NgModule } from '@angular/core';
import { CommonModule } from '@angular/common';
import { RouterModule } from '@angular/router';
import { LoginComponent } from './login/login.component';
import { RegistrationComponent } from './registration/registration.component';
import { ResetPasswordComponent } from './reset-password/reset-password.component';

@NgModule({
  imports: [
    CommonModule,
    RouterModule.forChild([
      { path: 'login', component: LoginComponent },
      { path: 'registration', component: RegistrationComponent },
      { path: 'reset-password', component: ResetPasswordComponent }
    ])
  ],
  declarations: [
    LoginComponent,
    RegistrationComponent,
    ResetPasswordComponent
  ]
})
export class PublicModule { }

The setup for the public module is standard.

Next, we have the protected area:

// Protected Module
import { NgModule } from '@angular/core';
import { CommonModule } from '@angular/common';
import { RouterModule } from '@angular/router';
import { NavbarWrapperComponent } from './navbar-wrapper/navbar-wrapper.component';
import { UserProfileComponent } from './user-profile/user-profile.component';

@NgModule({
  imports: [
    CommonModule,
    RouterModule.forChild([
      { path: '', redirectTo: '/login', pathMatch: 'full' },
      {
        path: '',
        component: NavbarWrapperComponent,
        children: [
          { path: 'profile', component: UserProfileComponent }
        ]
      }
    ])
  ],
  declarations: [
    NavbarWrapperComponent,
    UserProfileComponent
  ]
})
export class ProtectedModule { }

This is where the interesting part begins.

An important aspect is point 1:

{ path: '', redirectTo: '/login', pathMatch: 'full' },

This redirect is necessary in this location. Moving it to the AppModule will result in it being ignored. Placing it within the protected module makes more sense.

Point 2 allows all child routes to be handled by the NavbarWrapperComponent (point 3), which manages the rendering of the nested components.

Potential challenges and solutions:

  • If you want to include the redirect in the AppModule, adjust the path in point 2 to a unique identifier like protected. This will prefix all protected URLs with that value.
  • To incorporate multiple modules within the protected area, explore lazy loading techniques as described in the Angular documentation.
  • For advanced functionality such as parameter passing or navigation control, consider combining this method with event-based solutions.

While this approach may seem less flexible, it effectively covers various scenarios without the complexity of events. It leverages the features of the Router and offers a straightforward and maintainable solution.

Answer №3

For those seeking the most effective approach in Angular 4, utilizing the new router with children routes, all you need is to make use of the UrlSerializer-class to eliminate parentheses. Check out this link for more information. Has anyone tried using this method?

export const ROUTES: Routes = [
  { path: 'login', component: LoginComponent },
  {
    path : '',
    children: [
        {
          path: '', component: DefaultLayoutComponent,
          children: [
            { path: '', component: HomeComponent, canActivate: [AuthGuard] },
            { path: 'users', component: UsersListComponent, canActivate: [AuthGuard] },
            { path: 'users-add', component: UsersAddComponent, canActivate: [AuthGuard] },
            { path: 'users-view/:id', component: UsersViewComponent, canActivate: [AuthGuard] },
            { path: 'users-edit/:id', component: UsersEditComponent, canActivate: [AuthGuard] },
            ]
        }
    ]
  },
  // otherwise redirect to home
  { path: '**', redirectTo: '' }
]

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