I've got routes with lazy loading and onLoad Guard. Within the guard I grap the navigation menu from backend (you only see naviagtion points which you are authenticated for) and compare the route with the route-list from backend.
The problem: when I click on a button to a route, the route is triggered, but gets immediately canceled (traced in console) with the following reason:
NavigationCancelingError: Cannot load children because the guard
of the route "path: 'meldungsmanagement'" returned false
although debugging angular shows that the onLoad method didn't even resolve - and it would return true!
appRouting.module.ts
import {NgModule} from '@angular/core';
import {PortalComponent} from './portal/portal.component';
import {AuthGuardService} from './core/authguard.service';
import {RouterModule, Routes} from '@angular/router';
const appRoutes: Routes = [
{
path: '',
redirectTo: 'startseite',
pathMatch: 'full'
},
{
path: 'startseite',
component: PortalComponent
},
{
path: 'meldungsmanagement',
loadChildren: './incidents/incidentOverview.module#IncidentOverviewModule',
canLoad: [AuthGuardService]
},
];
@NgModule({
imports: [RouterModule.forRoot(
appRoutes,
{enableTracing: true})], // enable only for debugging purposes
exports: [RouterModule]
})
export class AppRoutingModule {
}
AuthGuardService:
import {Injectable} from '@angular/core';
import {
ActivatedRouteSnapshot,
CanActivate,
CanLoad,
Route,
Router,
RouterStateSnapshot,
UrlSegment
} from '@angular/router';
import {GlobalSettingsService} from './globalSettings.service';
import {Observable} from 'rxjs';
import {NavbarService} from './navbar.service';
import {NavbarModel} from '../shared/models/navbar.model';
import {KeycloakService} from './keycloak/keycloak.service';
@Injectable()
export class AuthGuardService implements CanActivate, CanLoad {
constructor(private router: Router,
private keycloakService: KeycloakService,
private navBarService: NavbarService,
private globalSettings: GlobalSettingsService) {
}
canLoad(route: Route,
segments: UrlSegment[]): Observable<boolean> | Promise<boolean> | boolean {
const isLoggedIn = this.keycloakService.isAuthenticated();
if (isLoggedIn) {
this.navBarService.getStucture().subscribe(menuRoutes => {
const isAccessAllowed: boolean = this.checkRoleAccessAllowed(segments, menuRoutes);
console.log('AuthGuard.canLoad() - return ' + isAccessAllowed + ' for route ' + route.path);
return Promise.resolve(isAccessAllowed);
}
);
} else {
console.log('AuthGuard.canLoad() - return false (not loggedIn) for route ' + route.path);
return Promise.resolve(false);
}
}
checkRoleAccessAllowed(url: UrlSegment[], menu: Array<NavbarModel>): boolean {
const foundNavbarModel: NavbarModel = menu.find(value => value.link.indexOf(url[0].path) > -1);
if (foundNavbarModel) {
return true;
} else {
return false;
}
}
}
console output: (traced from clicking button to route "meldungsmanagement" on)
Router Event: NavigationStart
NavigationStart(id: 3, url: '/meldungsmanagement')
NavigationStart {id: 3, url: "/meldungsmanagement", navigationTrigger: "imperative", restoredState: null}
Router Event: NavigationCancel
NavigationCancel(id: 3, url: '/meldungsmanagement')
NavigationCancel {id: 3, url: "/meldungsmanagement", reason: "NavigationCancelingError: Cannot load children bec…route "path: 'meldungsmanagement'" returned false"}id: 3reason: "NavigationCancelingError: Cannot load children because the guard of the route "path: 'meldungsmanagement'" returned false"url: "/meldungsmanagement"__proto__: RouterEvent
Router Event: NavigationStart
NavigationStart(id: 4, url: '/')
NavigationStart {id: 4, url: "/", navigationTrigger: "imperative", restoredState: null}
Router Event: RoutesRecognized
Router Event: GuardsCheckStart
Router Event: GuardsCheckEnd
Router Event: ActivationEnd
Router Event: ChildActivationEnd
Router Event: NavigationEnd
Router Event: Scroll
Router Event: NavigationStart
NavigationStart(id: 5, url: '/')
NavigationStart {id: 5, url: "/", navigationTrigger: "imperative", restoredState: null}
AuthGuard.canLoad() - return true for route meldungsmanagement
Router Event: RoutesRecognized
RoutesRecognized(id: 5, url: '/', urlAfterRedirects: '/startseite', state: Route(url:'', path:'') { Route(url:'startseite', path:'startseite') } )
RoutesRecognized {id: 5, url: "/", urlAfterRedirects: "/startseite", state: RouterStateSnapshot}
Router Event: GuardsCheckStart
GuardsCheckStart(id: 5, url: '/', urlAfterRedirects: '/startseite', state: Route(url:'', path:'') { Route(url:'startseite', path:'startseite') } )
GuardsCheckStart {id: 5, url: "/", urlAfterRedirects: "/startseite", state: RouterStateSnapshot}
Router Event: ChildActivationStart
ChildActivationStart(path: '')
As you can see, the route is triggered, closed, redirected to "/" and many rows later the authGuard says he returnd TRUE...
Why on earth does the router not wait for the guards answer? Where does the "false" come from? Where did I go wrong?
I'd appreciate any help, thanks!
PS: I already read the question Angular2: Router Event: NavigationCancel before Route Guard has resolved but it didn't match my case, cause the user still is logged in and I don't want to redirect within the guard.
Following my comments, here is a way of returning the value you want to :
if (isLoggedIn) {
return this.navBarService.getStucture().pipe(
map(menuRoutes => this.checkRoleAccessAllowed(segments, menuRoutes)),
tap(value => console.log('AuthGuard.canLoad() - return ' + value + ' for route ' + route.path))
);
}