How to overwrite a component in Angular 5?

Matteo Calò Published at Dev

Matteo Calò

I have a component <my-component> in Angular 5

@Component({
selector: 'my-component',
templateUrl: './my.component.html',
styleUrls: ['./my.component.css']
})
export class MyComponent {

click(param: string){
 console.log(param);
}

And in my html I have something like this:

<my-component (click)="click('Hello world')"></my-component>

I need to overwrite click function to execute: console.log('Param: ' + param);

How can I do this???

Lynx 242

In your app.module.ts

import { OriginalComponent } from './original/original.component';
import { MockOfOriginalComponent } from './mock/mock-of-original.component';

@NgModule({
  declarations: [
    AppComponent,
    WelcomeComponent,
    OriginalComponent,
    MockOfOriginalComponent

  ],
  providers: [],
  imports: [
    BrowserModule,
    HttpClientModule,
    RouterModule.forRoot([
      { path: 'welcome', component: WelcomeComponent },
      { path: 'pm-mock-of-original', component: MockOfOriginalComponent },
      { path: 'pm-original', redirectTo: 'pm-mock-of-original' },
    ]),
  ],
  bootstrap: [AppComponent]
})
export class AppModule { }

Your OriginalComponent

@Component({
    moduleId: module.id,
    selector: 'pm-original',
    templateUrl: 'original.component.html',
    styleUrls: ['original.component.scss']
    })

    export class OriginalComponent {

    }

Your MockOfOriginalComponent

@Component({
    moduleId: module.id,
    selector: 'pm-mock-of-original',
    templateUrl: 'mock-of-original.component.html',
    styleUrls: ['mock-of-original.component.scss']
    })

    export class MockOfOriginalComponent {

    }

The trick is the redirection in your AppModule

  { path: 'pm-mock-of-original', component: MockOfOriginalComponent },
  { path: 'pm-original', redirectTo: 'pm-mock-of-original' }

I tested this locally and it worked properly. If it doesn't try this

  { path: 'pm-mock-of-original', component: MockOfOriginalComponent },
  { path: 'pm-original', redirectTo: 'pm-mock-of-original', pathMatch: 'full' }

This also works when you import both components from (external) modules.

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