Router

Router Diagram

In the browser, the location (URL information) and session history (a stack of locations visited by the current browser tab) are stored in the global window object. They are accessible via:

• window.location (Location API)

• window.history (History API)

Our location data is a dynamic and important part of application state-the kind of state that belongs in a store. Holding it in the store enables devtools luxuries like time-travel debugging, and easy access from any store-connected component.

This plugin binds that state from the Angular router to our NGXS store.

Installation

npm install @ngxs/router-plugin --save

# or if you are using yarn
yarn add @ngxs/router-plugin

Usage

Add the NgxsRouterPluginModule plugin to your root app module:

import { NgxsModule } from '@ngxs/store';
import { NgxsRouterPluginModule } from '@ngxs/router-plugin';

@NgModule({
  imports: [
    NgxsModule.forRoot([]),
    NgxsRouterPluginModule.forRoot()
  ]
})
export class AppModule {}

Now the route will be reflected in your store under the router state name. The state is represented as a RouterStateSnapshot object.

You can also navigate using the store's dispatch method. It accepts the following arguments: new Navigate(path: any[], queryParams?: Params, extras?: NavigationExtras). A simple example would be navigating to the admin page like this:

import { Store } from '@ngxs/store';
import { Navigate } from '@ngxs/router-plugin';

@Component({ ... })
export class MyApp {

  constructor(private store: Store) {}

  onClick() {
    this.store.dispatch(new Navigate(['/admin']))
  }

}

You can use action handlers to listen to state changes in your components and services by subscribing to the RouterNavigation, RouterCancel or RouterError action classes.

Custom Router State Serializer

You can implement your own router state serializer to serialize the router snapshot.

import { Params, RouterStateSnapshot } from '@angular/router';

import { NgxsModule } from '@ngxs/store';
import { NgxsRouterPluginModule, RouterStateSerializer } from '@ngxs/router-plugin';

export interface RouterStateParams {
  url: string;
  params: Params;
  queryParams: Params;
}

// Map the router snapshot to { url, params, queryParams }
export class CustomRouterStateSerializer implements RouterStateSerializer<RouterStateParams> {
  serialize(routerState: RouterStateSnapshot): RouterStateParams {
    const {
      url,
      root: { queryParams }
    } = routerState;

    let { root: route } = routerState;
    while (route.firstChild) {
      route = route.firstChild;
    }

    const { params } = route;

    return { url, params, queryParams };
  }
}

@NgModule({
  imports: [NgxsModule.forRoot([]), NgxsRouterPluginModule.forRoot()],
  providers: [{ provide: RouterStateSerializer, useClass: CustomRouterStateSerializer }]
})
export class AppModule {}