Guide to inheriting functions from a parent component in Angular 2

Hello, I am a beginner in the realm of angular2 and would appreciate any assistance in refining my vocabulary and terminology.

Currently, I have a class that consists of two directives structured as follows:

In parent.component.ts, the Parent component is comprised of both Foo and Bar

@Component({
  selector: 'parent',
  directives: [Foo, Bar]
  ...
  template: require('./parent.html')
})
export class Parent {
  ...
}

In Foo.component.ts, we define the Foo directive

@Component({
  selector: 'foo',
  directives: [],
  ...
})
export class Foo {
  ...
  browse() {
    this.router.navigate(['/pages/somewhere', []]);
  }
}

In Bar.component.ts, we define the Bar directive

@Component({
  selector: 'bar',
  directives: [],
  ...
})
export class Bar {
  ...
  browse() {
    this.router.navigate(['/pages/somewhere', []]);
  }
}

In the HTML templates for both Foo and Bar, I aim to implement a click event (browse()) that performs the same action. While I currently have it functioning as described above, there appears to be redundant code within the definitions of both Foo and Bar which could potentially be consolidated within the Parent component

I am curious about how inheritance could be implemented in this scenario. Any advice or guidance would be greatly appreciated.

Answer №1

If you want to maintain a cleaner structure, it's best to handle this functionality within the components themselves rather than outsourcing it to a service. The recommended approach is to utilize an Output() in the child components and bind the (click) event to the browse() function.

@Component({
   selector: 'bar',
   directives: [],
    ...
})
export class Bar {
    @Output() browse: EventEmitter<Node> = new EventEmitter<Node>();

    ...
    browse() {
       this.browse.emit(/*some data could be passed here*/)
    }
  }

In the parent template:

<bar (browse)="goSomewhere($event)" neolabel="Company"></bar>

And Component:

@Component({
   selector: 'parent',
   directives: [Foo, Bar]
   ...
   template: require('./parent.html')
 })
export class Parent {
   goSomewhere(event){this.router.navigate(['/pages/somewhere', []]);}
...
}

This approach centralizes the logic in the parent component while ensuring the interface remains cohesive with the application's overall structure.

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