How to get all route params/data

Question

Given a route config

{
   path: '/root/:rootId',
   children: [{
       path: '/child1/:child1Id',
       children: [{
           path: '/child2/:child2Id
           component: TestComponent
       }]
   }]
}

In TestComponent how can I easily get all route params. I'm wondering if there is an easier way than

let rootId = route.parent.parent.snapshot.params;
let child1Id = route.parent.snapshot.params;
let child2Id = route.snapshot.params;

This seems overly redundant especially if I'm watching the route params observable instead of access the param through the route snapshot. This method also seems fragile since it would break If I moved any any of the routes/params around. Im used to angular ui-router where a single object $stateParams was supplied with all param data easily accessible. I have these same concerns with route resolved data along being accessed from a single node in the route tree. Any help would be much appreciated. Thanks in advance

Answer 1

As of Angular 5.2, you can do Router configuration to inherit all params to child states. See this commit if interested in the gory details, but here's how it's working for me:

Wherever you have your call to RouterModule.forRoot(), include a configuration object with the inheritance strategy set to always (default is emptyOnly):

import {RouterModule, ExtraOptions} from "@angular/router";

export const routingConfiguration: ExtraOptions = {
  paramsInheritanceStrategy: 'always'
};

export const Routing = RouterModule.forRoot(routes, routingConfiguration);

Now when you're in a child component looking at a ActivatedRoute, ancestors' params appear there (e.g. activatedRoute.params) rather than something messy like activatedRoute.parent.parent.parent.params. You could access the value directly (e.g. activatedRoute.params.value.userId) or subscribe via activatedRoute.params.subscribe(...).

Answer 2

You need to iterate the route segments.

Something like

var params = [];
var route = router.routerState.snapshot.root;
do {
 params.push(route.params); 
 route = route.firstChild;
} while(route);

This gives you the list of params of each route segment, you then can read the param values from them that you want.

Object.keys(params) might work to get all available param names from a param instance.

Answer 3

constructor(private route: ActivatedRoute) {}

data$ = of(this.route).pipe(
    expand(route => of(route['parent'])),
    takeWhile(route => !!route['parent']),
    pluck('snapshot', 'data'),
    reduce(merge));

Explanation:

Calling expand here creates an observable for each route in the parent chain. Takewhile is used so that it stops recursing when route['parent'] returns null, or at the root route.

Then, for all of those routes in the observable, pluck will map each to it's 'snapshot.data' property.

Finally, reduce is being fed the merge function from lodash to combine all the data objects into one object. This stream aggregates all the data from the current route through the parent routes

Answer 4

I've created the following service to be able to get all route params as a ParamMap. The main idea behind it, is to recursively parse all the parameters from the child routes.

Github gist

import {Injectable} from '@angular/core';
import {
  ActivatedRoute,
  Router,
  NavigationEnd,
  ParamMap,
  PRIMARY_OUTLET,
  RouterEvent
} from '@angular/router';
import {Observable} from 'rxjs/Observable';
import 'rxjs/add/operator/filter';
import 'rxjs/add/operator/map';

@Injectable()
export class ParamMapService {

  paramMap: Observable<ParamMap>;

  constructor(private router: Router,
              private route: ActivatedRoute) {
    this.paramMap = this.getParamMapObservable();
  }

  private getParamMap(route: ActivatedRoute): ParamMap {
    const map: Map<string, string | string[]> = new Map();

    while (route) {
      route.snapshot.paramMap.keys.forEach((key) => {
        map.set(key, this.getParamMapValue(route.snapshot.paramMap, key));
      });
      route = route.firstChild;
    }

    return <ParamMap>{
      keys: this.getParamMapKeys(map),
      has: this.getParamMapMethodHas(map),
      get: this.getParamMapMethodGet(map),
      getAll: this.getParamMapMethodGetAll(map)
    };
  }

  private getParamMapMethodGet(map: Map<string, string | string[]>): (name: string) => string | null {
    return (name: string): string | null => {
      const value = map.get(name);
      if (typeof value === 'string') {
        return value;
      }
      if (Array.isArray(value) && value.length) {
        return value[0];
      }
      return null;
    };
  }

  private getParamMapMethodGetAll(map: Map<string, string | string[]>): (name: string) => string[] {
    return (name: string): string[] => {
      const value = map.get(name);
      if (typeof value === 'string') {
        return [value];
      }
      if (Array.isArray(value)) {
        return value;
      }
      return [];
    };
  }

  private getParamMapMethodHas(map: Map<string, string | string[]>): (name: string) => boolean {
    return (name: string): boolean => map.has(name);
  }

  private getParamMapKeys(map: Map<string, string | string[]>): string[] {
    return Array.from(map.keys());
  }

  private getParamMapObservable(): Observable<ParamMap> {
    return this.router.events
      .filter((event: RouterEvent) => event instanceof NavigationEnd)
      .map(() => this.route)
      .filter((route: ActivatedRoute) => route.outlet === PRIMARY_OUTLET)
      .map((route: ActivatedRoute) => this.getParamMap(route));
  }

  private getParamMapValue(paramMap: ParamMap, key: string): string | string[] {
    return (paramMap.getAll(key).length > 1 ? paramMap.getAll(key) : paramMap.get(key));
  }
}

---

Example Usage

id;

constructor(private paramMapService: ParamMapService) {
  this.paramMapService.paramMap.subscribe(paramMap => {
    this.id = paramMap.get('id');
  });
}

Note

ES6 Map is being used in the service. To support older browsers, do one of the following:

• Uncomment the import 'core-js/es6/map'; line in polyfills.ts, or
• Convert all Map occurrences to a simple object.

Answer 5

Angular 5:

import { combineLatest } from 'rxjs/observable/combineLatest';



 constructor(
    private activatedRoute: ActivatedRoute
  ) {
    combineLatest(
      this.activatedRoute.data,
      this.activatedRoute.params
    ).subscribe(([{from}, params]) => {
      this.params.from = from;
      this.params.id = params['id'];
      this.loadData();
    });
  }

Answer 6

I got the first route param this way:

console.log(this.route.snapshot.firstChild.params)