Answer21

apps/angular/anchor-scrolling/src/app/app.config.ts

@@ -1,6 +1,20 @@
 import { ApplicationConfig } from '@angular/core';
-import { provideRouter } from '@angular/router';
+import {
+  provideRouter,
+  withInMemoryScrolling,
+  withViewTransitions,
+} from '@angular/router';
 import { appRoutes } from './app.routes';
+
 export const appConfig: ApplicationConfig = {
-  providers: [provideRouter(appRoutes)],
+  providers: [
+    provideRouter(
+      appRoutes,
+      withViewTransitions(),
+      withInMemoryScrolling({
+        anchorScrolling: 'enabled', // Enables scrolling to fragments (#id)
+        scrollPositionRestoration: 'enabled',
+      }),
+    ),
+  ],
 };

apps/angular/anchor-scrolling/src/app/foo.component.ts

@@ -1,15 +1,18 @@
 import { Component } from '@angular/core';
+import { RouterLink } from '@angular/router';
 import { NavButtonComponent } from './nav-button.component';
 
 @Component({
   standalone: true,
-  imports: [NavButtonComponent],
+  imports: [NavButtonComponent, RouterLink],
   selector: 'app-foo',
   template: `
     Welcome to foo page
-    <nav-button href="home" class="fixed left-1/2 top-3">Home Page</nav-button>
+    <nav-button [links]="'/home'" class="fixed left-1/2 top-3 snap-start">
+      Home Page
+    </nav-button>
     <div class="h-screen bg-blue-200">section 1</div>
-    <div class="h-screen bg-red-200">section 2</div>
+    <div class="h-screen snap-end bg-red-200">section 2</div>
   `,
 })
 export class FooComponent {}

apps/angular/anchor-scrolling/src/app/home.component.ts

@@ -1,20 +1,29 @@
-import { Component } from '@angular/core';
+import { Component, Output } from '@angular/core';
+import { RouterLink, RouterLinkActive } from '@angular/router';
 import { NavButtonComponent } from './nav-button.component';
 
 @Component({
   standalone: true,
-  imports: [NavButtonComponent],
+  imports: [NavButtonComponent, RouterLink, RouterLinkActive],
   selector: 'app-home',
   template: `
-    <nav-button href="/foo" class="fixed left-1/2 top-3">Foo Page</nav-button>
-    <div id="top" class="h-screen bg-gray-500">
+    <nav-button [links]="'/foo'" class="fixed left-1/2 top-3">
+      Foo Page
+    </nav-button>
+    <div id="top" class="h-screen snap-start bg-gray-500">
       Empty
-      <nav-button href="#bottom">Scroll Bottom</nav-button>
+      <nav-button [links]="homePath" [fragment]="'bottom'">
+        Scroll Bottom
+      </nav-button>
     </div>
-    <div id="bottom" class="h-screen bg-blue-300">
+    <div id="bottom" class="h-screen snap-start bg-blue-300">
       I want to scroll each
-      <nav-button href="#top">Scroll Top</nav-button>
+      <nav-button [links]="homePath" [fragment]="'top'">Scroll Top</nav-button>
     </div>
   `,
 })
-export class HomeComponent {}
+export class HomeComponent {
+  @Output() links = '.';
+  @Output() fragment = '';
+  homePath = '.';
+}

apps/angular/anchor-scrolling/src/app/nav-button.component.ts

@@ -1,17 +1,21 @@
 /* eslint-disable @angular-eslint/component-selector */
 import { Component, Input } from '@angular/core';
+import { RouterLink } from '@angular/router';
+
 @Component({
   selector: 'nav-button',
   standalone: true,
   template: `
-    <a [href]="href">
+    <a [routerLink]="links" [fragment]="fragment">
       <ng-content></ng-content>
     </a>
   `,
   host: {
     class: 'block w-fit border border-red-500 rounded-md p-4 m-2',
   },
+  imports: [RouterLink],
 })
 export class NavButtonComponent {
-  @Input() href = '';
+  @Input() links: string | string[] = '';
+  @Input() fragment = '';
 }

apps/angular/anchor-scrolling/src/styles.scss

@@ -3,3 +3,11 @@
 @tailwind utilities;
 
 /* You can add global styles to this file, and also import other style files */
+html {
+  scroll-behavior: smooth;
+  scroll-snap-type: y mandatory;
+}
+
+body {
+  overflow-y: scroll;
+}

apps/angular/projection/src/app/component/city-card/city-card.component.ts

@@ -1,13 +1,35 @@
 import { Component, OnInit } from '@angular/core';
+import { CityStore } from '../../data-access/city.store';
+import { FakeHttpService } from '../../data-access/fake-http.service';
+import { CardType } from '../../model/card.model';
+import { City } from '../../model/city.model';
+import { CardComponent } from '../../ui/card/card.component';
 
 @Component({
   selector: 'app-city-card',
-  template: 'TODO City',
+  template: `
+    <app-card
+      [list]="cities"
+      [type]="cardType"
+      [image]="image"
+      customClass="bg-light-red"></app-card>
+  `,
   standalone: true,
-  imports: [],
+  imports: [CardComponent],
 })
 export class CityCardComponent implements OnInit {
-  constructor() {}
+  cities: City[] = [];
+  image = 'city.png';
+  cardType = CardType.CITY;
 
-  ngOnInit(): void {}
+  constructor(
+    private http: FakeHttpService,
+    private store: CityStore,
+  ) {}
+
+  ngOnInit(): void {
+    this.http.fetchCities$.subscribe((s) => this.store.addAll(s));
+
+    this.store.cities$.subscribe((s) => (this.cities = s));
+  }
 }

apps/angular/projection/src/app/component/student-card/student-card.component.ts

@@ -11,6 +11,7 @@ import { CardComponent } from '../../ui/card/card.component';
     <app-card
       [list]="students"
       [type]="cardType"
+      [image]="image"
       customClass="bg-light-green"></app-card>
   `,
   standalone: true,
@@ -26,6 +27,7 @@ import { CardComponent } from '../../ui/card/card.component';
 export class StudentCardComponent implements OnInit {
   students: Student[] = [];
   cardType = CardType.STUDENT;
+  image = 'student.webp';
 
   constructor(
     private http: FakeHttpService,

apps/angular/projection/src/app/component/teacher-card/teacher-card.component.ts

@@ -11,6 +11,7 @@ import { CardComponent } from '../../ui/card/card.component';
     <app-card
       [list]="teachers"
       [type]="cardType"
+      [image]="image"
       customClass="bg-light-red"></app-card>
   `,
   styles: [
@@ -26,6 +27,7 @@ import { CardComponent } from '../../ui/card/card.component';
 export class TeacherCardComponent implements OnInit {
   teachers: Teacher[] = [];
   cardType = CardType.TEACHER;
+  image = 'teacher.png';
 
   constructor(
     private http: FakeHttpService,

apps/angular/projection/src/app/model/card.model.ts

@@ -3,3 +3,11 @@ export enum CardType {
   STUDENT,
   CITY,
 }
+
+export interface CardModel {
+  name: string;
+  firstName: string;
+  lastName: string;
+  subject: string;
+  id: number;
+}

apps/angular/projection/src/app/services/card.service.ts

@@ -0,0 +1,31 @@
+import { Injectable } from '@angular/core';
+import { CityStore } from '../data-access/city.store';
+import {
+  randomCity,
+  randStudent,
+  randTeacher,
+} from '../data-access/fake-http.service';
+import { StudentStore } from '../data-access/student.store';
+import { TeacherStore } from '../data-access/teacher.store';
+import { CardType } from '../model/card.model';
+
+@Injectable({
+  providedIn: 'root',
+})
+export class CardService {
+  constructor(
+    private teacherStore: TeacherStore,
+    private studentStore: StudentStore,
+    private cityStore: CityStore,
+  ) {}
+
+  addOne(type: CardType) {
+    if (type === CardType.TEACHER) {
+      this.teacherStore.addOne(randTeacher());
+    } else if (type === CardType.STUDENT) {
+      this.studentStore.addOne(randStudent());
+    } else if (type === CardType.CITY) {
+      this.cityStore.addOne(randomCity());
+    }
+  }
+}

apps/angular/projection/src/app/ui/card/card.component.ts

@@ -1,9 +1,7 @@
-import { NgFor, NgIf } from '@angular/common';
+import { CommonModule } from '@angular/common';
 import { Component, Input } from '@angular/core';
-import { randStudent, randTeacher } from '../../data-access/fake-http.service';
-import { StudentStore } from '../../data-access/student.store';
-import { TeacherStore } from '../../data-access/teacher.store';
 import { CardType } from '../../model/card.model';
+import { CardService } from '../../services/card.service';
 import { ListItemComponent } from '../list-item/list-item.component';
 
 @Component({
@@ -12,50 +10,39 @@ import { ListItemComponent } from '../list-item/list-item.component';
     <div
       class="flex w-fit flex-col gap-3 rounded-md border-2 border-black p-4"
       [class]="customClass">
-      <img
-        *ngIf="type === CardType.TEACHER"
-        src="assets/img/teacher.png"
-        width="200px" />
-      <img
-        *ngIf="type === CardType.STUDENT"
-        src="assets/img/student.webp"
-        width="200px" />
+      <ng-template #cardContent>
+        <img src="assets/img/{{ image }}" width="200px" />
 
-      <section>
-        <app-list-item
-          *ngFor="let item of list"
-          [name]="item.firstName"
-          [id]="item.id"
-          [type]="type"></app-list-item>
-      </section>
+        <section>
+          <app-list-item
+            *ngFor="let item of list"
+            [name]="item.firstName ?? item.name"
+            [id]="item.id"
+            [type]="type"></app-list-item>
+        </section>
 
-      <button
-        class="rounded-sm border border-blue-500 bg-blue-300 p-2"
-        (click)="addNewItem()">
-        Add
-      </button>
+        <button
+          class="rounded-sm border border-blue-500 bg-blue-300 p-2"
+          (click)="addNewItem()">
+          Add
+        </button>
+      </ng-template>
+
+      <ng-container *ngTemplateOutlet="cardContent"></ng-container>
     </div>
   `,
   standalone: true,
-  imports: [NgIf, NgFor, ListItemComponent],
+  imports: [CommonModule, ListItemComponent],
 })
 export class CardComponent {
-  @Input() list: any[] | null = null;
+  @Input() list!: any[];
   @Input() type!: CardType;
   @Input() customClass = '';
+  @Input() image: string = '';
 
-  CardType = CardType;
-
-  constructor(
-    private teacherStore: TeacherStore,
-    private studentStore: StudentStore,
-  ) {}
+  constructor(private cardService: CardService) {}
 
   addNewItem() {
-    if (this.type === CardType.TEACHER) {
-      this.teacherStore.addOne(randTeacher());
-    } else if (this.type === CardType.STUDENT) {
-      this.studentStore.addOne(randStudent());
-    }
+    this.cardService.addOne(this.type);
   }
 }

apps/angular/projection/src/app/ui/list-item/list-item.component.ts

@@ -1,4 +1,5 @@
 import { Component, Input } from '@angular/core';
+import { CityStore } from '../../data-access/city.store';
 import { StudentStore } from '../../data-access/student.store';
 import { TeacherStore } from '../../data-access/teacher.store';
 import { CardType } from '../../model/card.model';
@@ -23,13 +24,16 @@ export class ListItemComponent {
   constructor(
     private teacherStore: TeacherStore,
     private studentStore: StudentStore,
+    private cityStore: CityStore,
   ) {}
 
   delete(id: number) {
     if (this.type === CardType.TEACHER) {
       this.teacherStore.deleteOne(id);
     } else if (this.type === CardType.STUDENT) {
       this.studentStore.deleteOne(id);
+    } else if (this.type === CardType.CITY) {
+      this.cityStore.deleteOne(id);
     }
   }
 }