Issue with ActivatedRoute being empty when called in a Service in Angular version 2.0.2

I am interested in utilizing ActivatedRoute in a service to retrieve route parameters, similar to how it can be done in a Component. However, I have encountered an issue where the ActivatedRoute object injected into the Service does not contain the expected params.

To showcase this behavior, I have created a Plunker demonstration: http://plnkr.co/edit/sckmDYnpIlZUbqqB3gli

It is important to note that my objective is to extract and utilize the parameter within the service itself, rather than in the component. The setup of the Plunker is purely for illustrating the problem.

Component (successfully retrieves 'test' parameter):

export class Component implements OnInit {
  result: string;

  constructor(private route: ActivatedRoute) {
  }

  ngOnInit() {
    this.route.params.subscribe(params => {
      this.result = params['test'];
    });
  }
}

Service (fails to retrieve 'test' parameter):

export class Service {
  result: string;

  constructor(private route: ActivatedRoute) {
    this.getData();
  }

  getData() {
    this.route.params.subscribe(params => {
      this.result = params['test'];
    });
  }
}

Answer №1

Service is a unique instance that is part of the root injector and is injected with the root ActivatedRoute.

Each outlet has its own injector and its individual ActivatedRoute instance.

To address this issue, it's recommended to allow route components to have their specific Service instances:

@Component({
  ...
  providers: [Service]
})
export class MainComponent { ... }

Answer №2

If you're looking for a solution that handles a single service instance, the estus answer may be just what you need.

This approach retrieves a parameter directly from the router and ensures only one instance of the service:

export class Service {
  result: string;

  constructor(private router: Router) {
    this.result = router.routerState.snapshot.root.children[0].url[index].path
  }
}

You can also implement it as an observable:

export class Service {
  result: string;

  constructor(private router: Router) {
    this.router.routerState.root.children[0].url.map((url) => {
      this.result = url[index].path;
    });
  }
}

If routerState is not accessible, consider this alternative method:

export class Service {
  result: string;

  constructor(private router: Router) {
    this.router.parseUrl(this.router.url).root.children.primary.segments[index].toString();
  }
}

Keep in mind that 'index' refers to the position of the parameter in the URL.

Answer №3

After encountering a particular issue, I managed to find a solution that worked for me.

@Component({
  selector: 'app-sample',
  styleUrls: [`../sample.component.scss`],
  templateUrl: './sample.component.html',
})
export class AppSampleComponent {
  constructor(private route: ActivatedRoute,
              private someService: SomeService){}
  public callServiceAndProcessRoute(): void {
    this.someService.processRoute(route);
  }
}

@Injectable()
export class SomeService {
  public processRoute(route: ActivatedRoute): void {
  // handle route processing logic here
  }
}

Essentially, you will need to pass the ActivatedRoute as a parameter to the service.

Answer №4

In my search through the latest Angular documentation (updated in 2022), I stumbled upon a helpful code snippet for services:

The documentation recommends utilizing the function below to access parameters from the router state outside of an activated component.

collectRouteParams(router: Router) {
    let params = {};
    let stack: ActivatedRouteSnapshot[] = [router.routerState.snapshot.root];
    while (stack.length > 0) {
        const route = stack.pop()!;
        params = {...params, ...route.params};
        stack.push(...route.children);
    }
    return params;
}

To delve deeper into this topic and explore related discussions, check out: https://github.com/angular/angular/pull/40306

Answer №5

I don't see any mention of a routerLink directive in the Plunker code you shared with me.

In order to navigate to your component and pass parameters, you must include a routerLink directive. Here's an example of how to do it:

<a routerLink="/myparam" >Click here to go to main component</a>

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