Angular 4 - Calling Component function through service

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1

As Do, while in service, to call a function of the component that prompted this service?

javascript angular
  • 1

    I don’t think it’s possible to do that...

  • I’m not an expert on Angular*, but in Angularjs you can implement a Watchers and publishing. It works like this: Your service has a method, register(), where you pass as current scope parameters and the function to be called (callback). On the service side you add the two to a collection of Watchers. At the desired moment you call all callbacks valid.

  • Probably your application should not do this. has how you post the code as example?

2 answers

2

In Angular2, the Components should not have the logic of a business rule, they should stay in the Services , in the Components should be only things related to the application template, things related to data handling should be in the Service.

1

You can communicate via Subject, in the concept of sending and receiving messages.

For example, your service will exist two functions, one that receives and one that sends.

@Injectable()
export class AlgumService{
    private subject = new Subject<string>();

    enviaMensagem(texto: string) {
        this.subject.next(texto);
    }

    recebeMensagem(): Observable<string> {
        return this.subject.asObservable();
    }
}

In your other service, Voce calls the AlgumService:

nomeMetodo() {
    // envia mensagem
    this.algumService.enviaMensagem('Seja bem vindo'):
}

and in your Component in OnInit(), Voce receives it:

this.algumService.recebeMensagem().subscribe(mensagem => {
    console.log(mensagem); // Seja bem vindo
    // chame sua funcao qualquer no componente
}, (error) => {
    console.log(error);
})

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