Angular 9 routes giving blank pages with no errors

Question

I've just upgraded to Angular 9 and created some child routes using lazy loading. Before these changes, my project and my routes worked perfectly but after these two changes, just my HomeComponent route (path: "") works correctly, but if I try to click the links to other routes (using routerLink), it simply doesn't redirect, and if I manually write the route in the browser, it gives me a blank page without errors.

To sum up: The project and the routes worked fine, but after I created the angular lazy loading routes, the only route that works is the default one (HomeComponent) and if I try to click the links to go to other routes nothing happens, if I manually type these routes in my browser it gives me a blank page without no errors.

---

app.module.ts

@NgModule({
  declarations: [
    AppComponent,
    HomeComponent,
  ],
  imports: [
    SharedModule,
    HomeModule,
    Mugan86GoogleAnalyticsModule.forRoot({analyticsId: 'XXX', showLog: false}),
    AnimateOnScrollModule.forRoot(),
    BrowserModule.withServerTransition({appId: 'serverApp'}),
    ServiceWorkerModule.register('ngsw-worker.js', {enabled: environment.production}),
  ],
  providers: [
    {provide: ErrorHandler, useClass: RollbarErrorHandler},
    {provide: RollbarService, useFactory: rollbarFactory}
  ],
  bootstrap: [AppComponent],
  exports: [
    SharedModule,
    HomeModule,
  ]
})
export class AppModule {
}

shared.module.ts

@NgModule({
  declarations: [
    FooterComponent,
    LoadingBallsComponent,
    NavbarComponent,
    ScrolledToDirective,
    TrackScrollDirective,
    TopArrowComponent,
    SnackbarComponent,
  ],
  imports: [
    BrowserModule,
    RouterModule,
    AppRoutingModule,
    BrowserAnimationsModule,
    CommonModule,
    FilterModule,
    ReactiveFormsModule,
    FormsModule,
    RecaptchaModule,
    AnimateOnScrollModule
  ],
  exports: [
    BrowserModule,
    CommonModule,
    FooterComponent,
    LoadingBallsComponent,
    NavbarComponent,
    FilterModule,
    AppRoutingModule,
    ReactiveFormsModule,
    FormsModule,
    RecaptchaModule,
    AnimateOnScrollModule,
    ScrolledToDirective,
    TrackScrollDirective,
    TopArrowComponent,
    SnackbarComponent,
    RouterModule,
    BrowserAnimationsModule]
})
export class SharedModule {
}

home.module.ts

@NgModule({
  declarations: [
    CharacteristicsComponent,
    ContactComponent,
    HeaderComponent,
    MainDescriptionComponent,
    InfluencerPromotionComponent,
    SocialMediaComponent,
    BoxItemComponent,
    BandIconComponent,
    ServicesComponent,
  ],
  imports: [
    SharedModule,
  ],
  exports: [
    CharacteristicsComponent,
    ContactComponent,
    HeaderComponent,
    MainDescriptionComponent,
    InfluencerPromotionComponent,
    SocialMediaComponent,
    BoxItemComponent,
    BandIconComponent,
    ServicesComponent
  ]
})
export class HomeModule { }

app-routing.module.ts

export const routes: Routes = [
  {path: '', pathMatch: 'full', component: HomeComponent}, // no route specified
  {path: '', component: HomeComponent},
  {path: 'sobre-nosotros', loadChildren: () => import('./components/about-us/about-us.module').then(m => m.AboutUsModule)},
  {
    path: 'preguntas-frecuentes',
    loadChildren: () => import('./components/common-questions/common-questions.module').then(m => m.CommonQuestionsModule)
  },
  {path: 'sitemap', loadChildren: () => import('./components/sitemap/sitemap.module').then(m => m.SitemapModule)},
  {path: '**', component: HomeComponent}, // fallback route (not found - 404)
];

@NgModule({
  imports: [RouterModule.forRoot(routes, {initialNavigation: 'enabled', preloadingStrategy: PreloadAllModules})],
  exports: [RouterModule]
})
export class AppRoutingModule {
}

---

As an example I will show the module and routing module of one of the routes that don't work:

about-us-module.ts

@NgModule({
  declarations: [AboutUsComponent],
  imports: [
    AppModule,
    CommonModule,
    AboutUsRoutingModule,
  ]
})
export class AboutUsModule { }

about-us-routing.module.ts

const routes: Routes = [{path: '', component: AboutUsComponent}];

@NgModule({
  imports: [RouterModule.forChild(routes)],
  exports: [RouterModule]
})
export class AboutUsRoutingModule {
}

---

Extra information

tsconfig.json (angularCompilerOptions)

  "angularCompilerOptions": {
    "enableIvy": true,
    "fullTemplateTypeCheck": true,
    "strictInjectionParameters": true
  }

angular.json (aot)

"aot": true,

package.json (to see the versions)

"dependencies": {
    "@angular/animations": "~9.1.9",
    "@angular/common": "~9.1.9",
    "@angular/compiler": "~9.1.9",
    "@angular/core": "~9.1.9",
    "@angular/forms": "~9.1.9",
    "@angular/platform-browser": "~9.1.9",
    "@angular/platform-browser-dynamic": "~9.1.9",
    "@angular/platform-server": "~9.1.9",
    "@angular/router": "~9.1.9",
    "@angular/service-worker": "~9.1.9",
    "@josee9988/filter-pipe-ngx": "^1.1.0",
    "@nguniversal/express-engine": "^9.1.1",
    "animate.css": "^3.7.2",
    "emailjs-com": "^2.4.1",
    "express": "^4.15.2",
    "mugan86-ng-google-analytics": "^1.1.1",
    "ng-recaptcha": "^5.0.0",
    "ng2-animate-on-scroll": "^2.0.0",
    "rollbar": "^2.16.2",
    "rxjs": "~6.5.5",
    "tslib": "^1.13.0",
    "zone.js": "~0.10.2"
  },
  "devDependencies": {
    "@angular-devkit/build-angular": "~0.901.7",
    "@angular/cli": "~9.1.7",
    "@angular/compiler-cli": "~9.1.9",
    "@angular/language-service": "~9.1.9",
    "@nguniversal/builders": "^9.1.1",
    "@types/express": "^4.17.0",
    "@types/jasmine": "~3.3.8",
    "@types/jasminewd2": "~2.0.3",
    "@types/node": "^12.11.1",
    "codelyzer": "^5.1.2",
    "jasmine-core": "~3.4.0",
    "jasmine-spec-reporter": "~4.2.1",
    "karma": "^5.0.9",
    "karma-chrome-launcher": "~2.2.0",
    "karma-coverage-istanbul-reporter": "~2.0.1",
    "karma-jasmine": "~2.0.1",
    "karma-jasmine-html-reporter": "^1.5.4",
    "protractor": "^7.0.0",
    "ts-node": "~7.0.0",
    "tslint": "~5.15.0",
    "typescript": "~3.8.3"

---

I have another project using Ivy and child routing and I just followed the same steps I did with the mentioned project but I found the described problem.

Edit

I have just removed the lazy loading and the modules/routing modules of each route and the app works again. So definitely the problem is caused by the lazy loading feature.

Answer 1

Please remove the first two Home-Routes (HomeComponent).

In app-routing.module you can enable the route debugging with:

@NgModule({
imports: [
      RouterModule.forRoot(routes, {enableTracing: true}),

Perhaps you can remove {initialNavigation: 'enabled', preloadingStrategy: PreloadAllModules}.

Your code looks fine. I hope that the debugging gives you more informations.

The AppRoutingModule should be used in AppModule only. It's not allowed to have a reference of AppRoutingModule in one of the lazy loaded sub modules.

Import BrowserModule, BrowserAnimationsModule and AppRoutingModule in AppModule.

Try to avoid big shared modules. See: Lazy Loading Angular - Code Splitting NgModules with Webpack