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Der Angular Router im Detail betrachtet
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Manfred Steyer
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October 10, 2017
Programming
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Der Angular Router im Detail betrachtet
Talk from AngularDays in Berlin (Germany), October 2017
Manfred Steyer
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October 10, 2017
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Transcript
Der neue Angular Router im Detail betrachtet Manfred Steyer SOFTWAREarchitekt.at
ManfredSteyer ManfredSteyer
Über mich … • Manfred Steyer • SOFTWAREarchitekt.at • Trainer
& Consultant • Focus: Angular • Gründer: angular-akademie.com • Google Developer Expert (GDE) Page ▪ 2 Manfred Steyer
Ziel • Den Router kennen lernen • Erweiterte Möglichkeiten kennen
lernen
Inhalt • Basics zu Routing • Child-Routes • Aux-Routes •
Guards • Resolver • Lazy Loading • Preloading Page ▪ 4
Didaktik • Präsentation • Live Coding
Motivation Der Router ist der Dreh- und Angelpunkt vieler SPA
Routing Basics Page ▪ 7
Routing unter Angular Page ▪ 8 Logo + Menü Menü
2 Fußzeile SPA Platzhalter
Routing unter Angular Page ▪ 9 Logo + Menü Menü
2 Fußzeile SPA Passagier- Komponente /FlugDemo#passagier
Routen via Hash-Fragment • /FlugDemo#passagier • Hash-Fragment wird nie zum
Server gesendet Page ▪ 10
Routen via History API • /FlugDemo/passagier • Gesamte Url wird
zum Server gesendet • Server antwortet mit SPA • Server kann erste Ansicht "vorrendern" • Performance, SEO, … • SPA informiert Browser über Grenze zwischen (eigentlicher) Url und Route Page ▪ 11
Parameter • passagier/7 • passagier/7?details=true&page=7 • passagier/7;details=true;page=7 • passagier/7;details=true;page=7/fluege Page
▪ 12
Konfiguration Page ▪ 13 const APP_ROUTES: Routes = [ {
path: 'home', component: HomeComponent }, { path: 'flug-suchen', component: FlugSuchenComponent } ]
Konfiguration Page ▪ 14 const APP_ROUTES: Routes = [ {
path: '', redirectTo: 'home', pathMatch: 'full' }, { path: 'home', component: HomeComponent }, { path: 'flug-suchen', component: FlugSuchenComponent } ]
Konfiguration Page ▪ 15 const APP_ROUTES: Routes = [ {
path: '', redirectTo: 'home', pathMatch: 'full' }, { path: 'home', component: HomeComponent }, […] { path: '**', redirectTo: 'home' } ]
Konfiguration Page ▪ 16 // app.module.ts @NgModule({ imports: [ BrowserModule,
HttpModule, FormsModule, RouterModule.forRoot(ROUTE_CONFIG) ], […] }) export class AppModule { } Für Root-Module Für Feature-Module: forChild
AppComponent Page ▪ 17 @Component({ selector: 'app', templateUrl: './app.component.html' })
export class App { […] }
View von AppComponent Page ▪ 19 <a routerLink="/">Home</a> <a routerLink="/flug-suchen">Flug
suchen</a> <div> <router-outlet></router-outlet> </div>
Routen mit Parameter Page ▪ 21
Konfiguration Page ▪ 22 const APP_ROUTES: Routes = [ […]
{ path: 'flug-suchen', component: FlugSuchenComponent }, { path: 'flug-edit/:id', component: FlugEditComponent } }
Parameter auslesen Page ▪ 23 export class FlugEditComponent { public
id: string; constructor( private route: ActivatedRoute) { route.params.subscribe( p => { this.id = p['id']; […] } ); } […] }
Links auf Routen mit Parameter Page ▪ 24 <a [routerLink]="['/flug-edit',
flug.id]">Edit</a>
DEMO Page ▪ 25 App Home Search Flight Edit Flight
Search Passenger Your Bookings FlightBookingModule AppModule
Hierarchisches Routing Page ▪ 26
Hierarchische Views Page ▪ 27 Logo + Menü Menü 2
Fußzeile SPA Platzhalter 1
Hierarchische Views Page ▪ 28 Logo + Menü Menü 2
Fußzeile SPA /FlugDemo/flugbuchen FlugBuchen-Komponente
Hierarchische Views Page ▪ 29 Logo + Menü Menü 2
Fußzeile SPA /FlugDemo/flugbuchen Optionen Platzhalter FlugBuchen-Komponente
Hierarchische Views Page ▪ 30 Logo + Menü Menü 2
Fußzeile SPA Optionen Passagier- Komponente FlugBuchen-Komponente /FlugDemo/flugbuchen/passagier
Konfiguration Page ▪ 31 const APP_ROUTES: Routes = [ {
path: '', component: HomeComponent, pathMatch: 'full' }, { path: 'flug-buchen', component: FlugBuchenComponent, children: [ { path: 'flug-suchen', component: FlugSuchenComponent }, […] ] } ];
DEMO Page ▪ 32 App Home Flight- Booking Search Flight
Edit Flight Search Passenger Your Bookings
Aux-Routes Page ▪ 35
Aux-Routes Page ▪ 36 Logo + Menu Menu 2 Footer
SPA Placeholder Named Placeholder
Aux-Routes Page ▪ 37 Logo + Menu Menu 2 Footer
SPA Flight- Component Named Placeholder /FlightApp/flights
Aux-Routes Page ▪ 38 Logo + Menu Menu 2 Footer
SPA Flight- Component Info-Component /FlightApp/flights(aux:info)
Aux-Routes Page ▪ 39 Logo + Menu Menu 2 Footer
SPA Flight- Component Modal-Component /FlightApp/flights(aux:info/modal)
Aux-Routes Page ▪ 40 Logo + Menu Menu 2 Footer
SPA Flight-Edit- Component Modal-Component /FlightApp/flights(aux:info/modal)/17
Use Cases • Modale Dialoge • “Applets” und teilautonome Bereiche
• Commander-Style Page ▪ 41
Platzhalter definieren Page ▪ 42 <router-outlet></router-outlet> <hr> <router-outlet name="aux"></router-outlet> Standard-Name:
primary
Konfiguration Page ▪ 43 export const ROUTE_CONFIG: Routes = [
{ path: 'home', component: HomeComponent }, { path: 'info', component: InfoComponent, outlet: 'aux' }, { path: 'dashboard', component: DashboardComponent, outlet: 'aux' } ]
Aux-Routes routen Page ▪ 44 <a [routerLink]="[{outlets: { aux: 'info'
}}]"> Activate Info </a> <a [routerLink]="[{outlets: { aux: null }}]"> Deactivate Info </a>
Aux-Routes routen Page ▪ 45 <a [routerLink]="[{outlets: { aux: 'info',
primary: 'flight-search' }}]"> Activate Info </a> <a [routerLink]="[{outlets: { aux: null }}]"> Deactivate Info </a>
Programmatisch routen Page ▪ 46 export class AppComponent { constructor(private
router: Router) { } activateInfo() { this.router.navigate([{outlets: { aux: 'info' }}]); } deactivateInfo() { this.router.navigate([{outlets: { aux: null }}]); } }
DEMO Page ▪ 47
Guards Page ▪ 48
Was sind Guards? • Services • Werden beim Aktivieren bzw.
Deaktivieren einer Route aktiv • Können Aktivierung und Deaktivierung verhindern Page ▪ 49
Guards Rückgabewert: boolean | Observable<boolean> | Promise<boolean> CanActivate canActivate CanActivateChild
canActivateChild CanLoad canLoad CanDeactivate<T> canDeactivate
Guards in der Konfiguration Page ▪ 52 const APP_ROUTES: Routes
= [ { path: '/flug-buchen', component: FlugBuchenComponent, canActivate: [AuthGuard], children: [ { path: 'flug-edit/:id', component: FlugEditComponent, canDeactivate: [FlugEditGuard] }, […] ] ] Token
Provider für Guards Page ▪ 53 // app.module.ts @NgModule({ providers:
[ { provide: FlugEditGuard, useClass: AdvFlightEditGuard } { provide: AuthGuard, useClass: AdvAuthGuard } ], […] }) export class AppModule { }
Provider für Guards Page ▪ 54 // app.module.ts @NgModule({ providers:
[ FlugEditGuard, AuthGuard ], […] }) export class AppModule { }
DEMO Page ▪ 55
Resolver
Was sind Resolver? • Services • Werden beim Routenwechsel aktiv
• Laden benötigte Daten • Verzögern Aktivierung der neuen Route • Zwischenzeitlich kann z. B. Loading Indikator angezeigt werden
Resolver @Injectable() export class FlightResolver implements Resolve<Flight> { constructor(private flightService:
FlightService) { } resolve(route, state): Observable<Flight> | Promise<Flight> | Flight { return […] } }
Resolver registrieren const FLIGHT_BOOKING_ROUTES: Routes = [ […] { path:
'flight-edit/:id', component: FlightEditComponent, resolve: { flight: FlightResolver } } ]; Token
Daten entgegennehmen @Component({ … }) export class FlightEditComponent { flight:
Flight; constructor(private route: ActivatedRoute) { } ngOnInit() { this.route.data.subscribe( data => { this.flight = data['flight']; } ); } }
DEMO
Lazy Loading Page ▪ 63
Warum Lazy Loading? • Module erst bei Bedarf nachladen •
Verbesserung der Start-Performance Page ▪ 64
Root Module mit Lazy Loading Page ▪ 65 const APP_ROUTE_CONFIG:
Routes = [ { path: '', redirectTo: 'home', pathMatch: 'full' }, { path: 'home', component: HomeComponent }, { path: 'flights', loadChildren: '[…]flight-booking.module#FlightBookingModule' } ];
Routen für Feature Module Page ▪ 66 const FLUG_ROUTES =
[ { path: '', component: FlugBuchenComponent, […] }, […] } export const FlugRouterModule = RouterModule.forChild(FLUG_ROUTES);
DEMO Page ▪ 67
Preloading Page ▪ 68
Idee • Eventuell später benötigte Module werden mit freien Ressourcen
vorgeladen • Wird das Modul später tatsächlich benötigt, steht es augenblicklich zur Verfügung Page ▪ 69
Preloading aktivieren Page ▪ 70 export const AppRoutesModule = RouterModule.forRoot(
ROUTE_CONFIG, { preloadingStrategy: PreloadAllModules });
Lazy Loading und Shared Services Page ▪ 71
DEMO
Lazy Loading und Shared Modules Page ▪ 73 AppModule FlugModule
SharedModule includes includes (lazy) includes
Lazy Loading und Shared Modules Page ▪ 74 AppModule FlugModule
SharedModule includes includes (lazy) includes AuthService AuthService
Lazy Loading und Shared Modules Page ▪ 75 AppModule FlugModule
SharedModule includes includes (lazy) includes AuthService AuthService
Lösung Page ▪ 76 AppModule FlugModule SharedModule includes (lazy) includes
CoreModule includes includes Core-Module soll nur ins AppModule eingebunden werden Globale Provider, wie AuthService & Shell
DEMO
Lösung (für Libraries) Page ▪ 78 AppModule FlugModule AuthModule includes
(lazy) CoreModule
Lösung (für Libraries) Page ▪ 79 AppModule FlugModule AuthModule includes
(lazy) includes (mit Services) CoreModule includes includes (ohne Services) Shell
AuthModule Page ▪ 81 @NgModule({ […], providers: [] }) export
class AuthModule { }
AuthModule Page ▪ 82 @NgModule({ […], providers: [] }) export
class AuthModule { static forRoot(): ModuleWithProviders { return { ngModule: AuthModule, providers: [AuthService, […]] } } }
DEMO Page ▪ 83
Zusammenfassung Platzhalter Child Routes Aux Routes Guards Lazy Loading Preloading
Kontakt [mail]
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[blog] SOFTWAREarchitekt.at [twitter] ManfredSteyer