Angular 2 Activatedroute params not working in Service or outside <router-outlet>

The component added by the router gets the router segment (ActivatedRoute) passed, but in a service there is no activated route. You can subscribe to router.events and traverse the routes tree (router.firstChild...`) to get params out of a specific route sequement you need.

See also https://github.com/angular/angular/issues/11023

Here is an angular service which does that :

import {Injectable}                                                        from '@angular/core';
import {ActivatedRoute, NavigationEnd, NavigationExtras, ParamMap, Router} from "@angular/router";
import {RouterExtensions}                                                  from "nativescript-angular/router";
import {NavigationOptions}                                                 from "nativescript-angular/router/ns-location-strategy";
import {Observable}                                                        from "rxjs/Observable";
import {first}                                                             from "rxjs/operators/first";
import {filter}                                                            from "rxjs/operators/filter";
import {map}                                                               from "rxjs/operators/map";
import {switchMap}                                                         from "rxjs/operators/switchMap";
import {unRegisterAndroidOnBack}                                           from "../../utils/view.utils";

@Injectable()
export class RoutingService
    {
        constructor(private routerExtensions: RouterExtensions, private route: ActivatedRoute, private router: Router)
        {
        }
        public getActivatedRouteParameter(paramName: string): Observable<ParamMap>
        {
            return this.router.events.pipe(filter(e => e instanceof NavigationEnd),
                                           map((): ActivatedRoute =>
                                               {
                                                   let route = this.route;
                                                   while (route.firstChild)
                                                       {
                                                           route = route.firstChild;
                                                       }
                                                   return route;
                                               }),
                                           filter((route: ActivatedRoute) => route.outlet === 'primary'),
                                           switchMap((route: ActivatedRoute) => route.paramMap) , first());

        }

.

Actually, your activatedRoute is correct and updated, but you have all the tree in that. so if you go all the way inside of route.firstChild, you will finally find the last route, which I called deeperActivatedRoute (inside of route.firstChild...route.firstChild)

So what I did is create a service to track the deeperRoute, and have it always accessible

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

@Injectable()
export class ActivatedRouteService {
  private _deeperActivatedRoute: ActivatedRoute;
  get deeperActivatedRoute(): ActivatedRoute {
    return this._deeperActivatedRoute;
  }

  constructor(private router: Router, private route: ActivatedRoute) {}

  init(): void {
    this.router.events.subscribe(event => {
      if (event instanceof NavigationEnd) {
        // Traverse the active route tree
        let activatedChild = this.route.firstChild;
        if (activatedChild != null) {
          let nextActivatedChild;
          while (nextActivatedChild != null) {
            nextActivatedChild = activatedChild.firstChild;
            if (nextActivatedChild != null) {
              activatedChild = activatedChild.firstChild;
            }
          }
        }

        this._deeperActivatedRoute = activatedChild || this.route;
      }
    });
  }
}

Then in app.component.ts I start the service (just to ensure it's always tracking)

export class AppComponent {
  constructor(private activatedRouteService: ActivatedRouteService) {
    this.activatedRouteService.init();
  }
}

And finally, take your route wherever service you are:

export class ForbiddenInterceptor implements HttpInterceptor {
  constructor(private activatedRouteService: ActivatedRouteService) { }

  doYourStuff(): void {
       //you'll have the correct activatedRoute here
       this.activatedRouteService.deeperActivatedRoute;
  }
}

Answering the question, you can just take the deeperActivatedRoute and check normally the snapshop.url, just as you would do in a component

I have been browsing for a simple solution around the web and finally found something that works in angular 8.

https://medium.com/@eng.ohadb/how-to-get-route-path-parameters-in-an-angular-service-1965afe1470e

This works as expected. There are many different flavors available over the web. However only this one worked for me. I am new to rxjs and observer piping so it gets quickly confusing when the chain gets long for me.

export class MyParamsAwareService {
  constructor(private router: Router) { 
    this.router.events
      .pipe(
        filter(e => (e instanceof ActivationEnd) && (Object.keys(e.snapshot.params).length > 0)),
        map(e => e instanceof ActivationEnd ? e.snapshot.params : {})
      )
      .subscribe(params => {
      console.log(params);
      // Do whatever you want here!!!!
      });
  }
}

Obviously afterwards you can design your service however you want. To interface your params.