What is causing the issue of URL parameters becoming undefined when performing service injection in the app component?

When working with a service that reads parameters from the URL, everything seems to be functioning properly until attempting to inject the service into the constructor of the app.component.ts file or trying to call a service method from the app.component.ts. At this point, the URL parameters appear as undefined.

Does anyone have any insight into what might be causing this issue?

my-service.service.ts:

...
public param1;
constructor(public router: Router, private http: HttpClient) {
    this.param1 = 
     this.router.parseUrl(this.router.url).queryParams['todo'];
    console.log('param1: ' + this.param1); // returns undefined if the service is injected in app.component
}
....

app.component.ts:

...
import { MyService } from './service/my-service.service';
....
constructor(private http: HttpClient, public myService: MyService) {
    ...
}

Answer №1

Whenever we need to pass parameters, we follow this standard procedure:

import { Router, ActivatedRoute } from '@angular/router';

  constructor(
    private router: Router,
    private route: ActivatedRoute
  ){ 
      this.route.params.subscribe(params => {
        let task = params['task'];
      });
  }

In some cases, it might be necessary to move the subscription to ngOnInit(), but in general, this approach should suffice.

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