There is AppComponent and SecurityService.
...
@Injectable()
export class SecurityService implements OnInit {
private _url: string;
constructor(private http: Http, private name?: string) {
this._wsUrl = 'http://myurl/' + this.name
}
...
}
AppComponent is one which will inject security service.
export class App {
constructor(private security: SecurityService){
}
...
}
My question is: How can I provide this optional param value for the security service constructor?
Just add the @Optional()
decorator before the constructor parameter that should only be injected if there was a provider registered.
constructor(private http: Http,@Optional() private name: string)
You can read more about Optional here