feat: always scroll to top on page switch

src/app/app.component.html

@@ -1,5 +1,5 @@
 <div class="app-content" [attr.aria-hidden]="isLanguageSelectorOpen() ? 'true' : null" [attr.inert]="isLanguageSelectorOpen() ? '' : null">
-  <router-outlet></router-outlet>
+  <router-outlet (activate)="scrollToTopAfterOutletActivation()"></router-outlet>
 </div>
 
 <button

src/app/app.component.ts

@@ -1,14 +1,18 @@
-import { DOCUMENT } from '@angular/common';
+import { DOCUMENT, isPlatformBrowser } from '@angular/common';
 import {
   ChangeDetectionStrategy,
   Component,
+  DestroyRef,
   computed,
   effect,
   inject,
+  PLATFORM_ID,
   signal,
 } from '@angular/core';
+import { takeUntilDestroyed } from '@angular/core/rxjs-interop';
 import type { OnDestroy, OnInit } from '@angular/core';
-import { RouterOutlet } from '@angular/router';
+import { NavigationEnd, Router, RouterOutlet } from '@angular/router';
+import { filter } from 'rxjs';
 
 import type { LanguageCode } from '../languages/language.types';
 import type { LanguageOption } from './app.types';
@@ -23,7 +27,10 @@ import { LanguageService } from './services/language.service';
 })
 export class AppComponent implements OnInit, OnDestroy {
   private readonly document = inject(DOCUMENT);
+  private readonly destroyRef = inject(DestroyRef);
   private readonly languageService = inject(LanguageService);
+  private readonly platformId = inject(PLATFORM_ID);
+  private readonly router = inject(Router);
 
   protected readonly content = this.languageService.shellContent;
   protected readonly currentLanguageCode = this.languageService.languageCode;
@@ -47,6 +54,13 @@ export class AppComponent implements OnInit, OnDestroy {
       this.document.body.style.overflow = overflowValue;
       this.document.documentElement.style.overflow = overflowValue;
     });
+
+    this.router.events
+      .pipe(
+        filter((event): event is NavigationEnd => event instanceof NavigationEnd),
+        takeUntilDestroyed(this.destroyRef),
+      )
+      .subscribe((event: NavigationEnd): void => this.scrollToTopAfterRouteChange(event));
   }
 
   ngOnInit(): void {
@@ -84,6 +98,37 @@ export class AppComponent implements OnInit, OnDestroy {
     return language === 'de' ? content.app.languageGerman : content.app.languageEnglish;
   }
 
+  protected scrollToTopAfterOutletActivation(): void {
+    if (!isPlatformBrowser(this.platformId)) {
+      return;
+    }
+
+    this.scrollDocumentToTop();
+    this.document.defaultView?.requestAnimationFrame((): void => this.scrollDocumentToTop());
+    this.document.defaultView?.setTimeout((): void => this.scrollDocumentToTop(), 0);
+    this.document.defaultView?.setTimeout((): void => this.scrollDocumentToTop(), 100);
+  }
+
+  private scrollToTopAfterRouteChange(event: NavigationEnd): void {
+    if (!isPlatformBrowser(this.platformId) || event.urlAfterRedirects.includes('#')) {
+      return;
+    }
+
+    this.scrollToTopAfterOutletActivation();
+  }
+
+  private scrollDocumentToTop(): void {
+    const scrollingElement = this.document.scrollingElement ?? this.document.documentElement;
+
+    scrollingElement.scrollTop = 0;
+    scrollingElement.scrollLeft = 0;
+    this.document.documentElement.scrollTop = 0;
+    this.document.documentElement.scrollLeft = 0;
+    this.document.body.scrollTop = 0;
+    this.document.body.scrollLeft = 0;
+    this.document.defaultView?.scrollTo({ top: 0, left: 0, behavior: 'auto' });
+  }
+
   ngOnDestroy(): void {
     this.document.body.style.overflow = '';
     this.document.documentElement.style.overflow = '';