Error: Angular 4 component failed to load

It seems that the route /users is not functioning as expected; instead of loading the UsersComponent, it loads the AppComponent.

Why is the /users route not loading the correct component?

Here is a snippet from app.module.ts:


        import { BrowserModule } from '@angular/platform-browser';
        import { NgModule } from '@angular/core';
        import { FormsModule } from '@angular/forms';
        import { RouterModule, Routes } from '@angular/router';

        import { AppComponent } from './app.component';
        import { UsersComponent } from './users/users.component';
        import { AppRouting } from './app-routing.component'

        @NgModule({
          declarations: [
            AppComponent,
            UsersComponent
          ],
          imports: [
            BrowserModule,
            AppRouting,
            FormsModule
            // other imports here
          ],
          providers: [],
          bootstrap: [AppComponent]
        })
        export class AppModule { }
    

Here is a snippet from app.component.ts:


        import { Component } from '@angular/core';

        @Component({
          selector: 'app-root',
          templateUrl: './app.component.html',
          styleUrls: ['./app.component.css']
        })
        export class AppComponent {
          title = 'app';
        }
    

Here is a snippet from user.component.ts:


        import { Component, OnInit } from '@angular/core';

        @Component({
          selector: 'app-users',
          templateUrl: './users.component.html',
          styleUrls: ['./users.component.css']
        })
        export class UsersComponent implements OnInit {

          constructor() { }

          ngOnInit() {
          }

        }
    

And here is a snippet from app-routing.component.ts:


        import { UsersComponent } from './users/users.component';

        import { NgModule } from '@angular/core';
        import { RouterModule, Routes } from '@angular/router';


        const routes: Routes = [
            { path: '', redirectTo: '/', pathMatch: 'full' },
            //{path:'appcomponent',component:AppComponent},
            { path: 'users', component: UsersComponent }
        ];

        @NgModule({
            imports: [RouterModule.forRoot(routes)],
            exports: [RouterModule],
        })
        export class AppRouting {


        }
    

In the HTML code, only this should be displayed:

Snippet from user.component.html:


        <p>
          users works!
        </p>
    

Answer №1

Oh, now I see the solution. To make routed components occupy the entire display area, you should only include the router outlet in your app.component.html file without any other elements.

I've tackled a similar situation where I needed to display certain components without a menu, like the login component.

To achieve this, I utilized multiple levels of router outlets.

Main App Component

I set up the main application component with just the primary router outlet. This is where I direct components that need to appear without the menu.

<router-outlet></router-outlet>

Shell Component

Next, I created a "shell" component with a secondary router outlet where I implemented the menu. Components intended to display with the menu are routed to this outlet.

<mh-menu></mh-menu>
<div class='container'>
   <router-outlet></router-outlet>
</div>

Routing Module

The routes are then configured utilizing the children property to specify which routes go into the ShellComponent.

This way, individual components do not have to control whether the menu is visible or not. It's all managed through the routing configuration.

RouterModule.forRoot([
  {
    path: '',
    component: ShellComponent,
    children: [
      { path: 'welcome', component: WelcomeComponent },
      { path: 'movies', component: MovieListComponent },
      { path: '', redirectTo: 'welcome', pathMatch: 'full' }
    ]
  },
  { path: 'login', component: LoginComponent },
  { path: '**', component: PageNotFoundComponent }
])

https://i.stack.imgur.com/8Kqxr.png depicts the region of the app router outlet.

https://i.stack.imgur.com/i2U0r.png illustrates the area of the shell router outlet.

Answer №2

Ensure that you include the router-outlet element within the AppComponent template.

...
<router-outlet></router-outlet>
...

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