Diskussionsthread zur Schulung

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Herzlich Willkommen! 🎉 Hier können wir während der Schulung Links und Codeschnipsel teilen.

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https://angular.dev/style-guide

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Installieren:

npx ng lint

Ausführen
npm run lint

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app.component.html – with Angular Logo!

<div class="container">
  <h1>
    <img
      width="100"
      alt="Angular Logo"
      src="data:image/png;base64,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"
    />
    {{ title }}
  </h1>

  <!-- <router-outlet></router-outlet> -->

</div>

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ng g c dashboard

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import { ApplicationConfig, provideExperimentalZonelessChangeDetection } from '@angular/core';
import { provideRouter } from '@angular/router';

import { routes } from './app.routes';

export const appConfig: ApplicationConfig = {
  providers: [
    // provideZoneChangeDetection({ eventCoalescing: true }),
    provideExperimentalZonelessChangeDetection(),
    provideRouter(routes)]
};

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ng generate interface books/shared/book

export interface Book {
  isbn: string;
  title: string;
  description: string;
  rating: number;
}

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ng g c books/book

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book.component.html

@let b = book();

<div class="card mb-4">
  <div class="card-body bg-light">
      <img class="img-thumbnail float-end" alt=""
        src="https://api.angular.schule/avatar/{{ b.rating }}">
    <div class="card-title">
      <h2>
        {{ b.title }}
        <span class="badge bg-secondary">{{ b.rating }}</span>
      </h2>
    </div>
    <p>{{ b.description }}</p>
  </div>
</div>

[JohannesHoppe]

https://getbootstrap.com/
https://tailwindcss.com/

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[JohannesHoppe]

describe('In der Mathematik', () => {

    // Arrange
    let summand: number;
    beforEeach(() => {
       summand = 1;
    });

    it('soll 1 + 1 immer 2 sein', () => {
        // Act
        const result = summand  + 1;

        // Assert
        expect(result).toBe(2)
    });
});

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ng g service books/shared/book-rating

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import { Injectable } from '@angular/core';
import { Book } from './book';

// Dependency Injection
@Injectable({
  providedIn: 'root'
})
export class BookRatingService {

  rateUp(book: Book): Book {
    return book; // TODO
  }

  rateDown(book: Book): Book {
    return book; // TODO
  }

}

import { Book } from './book';
import { BookRatingService } from './book-rating.service';

fdescribe('BookRatingService', () => {
  let service: BookRatingService;
  let book: Book;

  beforeEach(() => {
    service = new BookRatingService();
    book = {
      isbn: '000',
      title: 'Test',
      description: 'Test',
      rating: 3
    }
  });

  it('should rate up a book by one', () => {
    const ratedBook = service.rateUp(book);
    expect(ratedBook.rating).toBe(4);
  });

  it('should rate down a book by one', () => {
    const ratedBook = service.rateDown(book);
    expect(ratedBook.rating).toBe(2);
  });

  it('should not be allowed to have a rating greater than 5', () => {
    book.rating = 5;
    const ratedBook = service.rateUp(book);
    expect(ratedBook.rating).toBe(5);
  });

  it('should not be allowed to have a rating smaller than 1', () => {
    book.rating = 1;
    const ratedBook = service.rateDown(book);
    expect(ratedBook.rating).toBe(1);
  });

  it('should not mutate the book', () => {
    const frozenBook = Object.freeze(book);
    expect(() => service.rateUp(frozenBook)).not.toThrow();
    expect(() => service.rateDown(frozenBook)).not.toThrow();
  });
});

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import { Injectable } from '@angular/core';
import { Book } from './book';

// Dependency Injection
@Injectable({
  providedIn: 'root'
})
export class BookRatingService {

  readonly minRating = 1;
  readonly maxRating = 5;

  rateUp(book: Book): Book {
    return {
      ...book,
      rating: book.rating < this.maxRating ? book.rating + 1 : this.maxRating
    }
  }

  rateDown(book: Book): Book {

    const rating = Math.max(book.rating - 1, this.minRating);

    return {
      ...book,
      rating
    }
  }
}

[JohannesHoppe]

https://x.com/dr_cintas/status/1890801907414769698

[JohannesHoppe]

ng g c books/book-create

[JohannesHoppe]

book-create.component.html

<form>

  <div class="form-group">
    <label for="isbn">ISBN</label>
    <input type="text" class="form-control" id="isbn">
    @if (false) {
      <div class="feedback-error">The ISBN is not valid!</div>
    }
  </div>

  <div class="form-group">
    <label for="title">Title</label>
    <input type="text" class="form-control" id="title">
  </div>

  <div class="form-group">
    <label for="description">Description</label>
    <textarea class="form-control" id="description"></textarea>
  </div>

  <button
    type="submit" class="btn btn-primary mb-4">Create</button>

</form>

[JohannesHoppe]

🎮 NEU: RxJS Playground

Du kannst dir entweder

• den Code als ZIP-Datei herunterladen: rxjs-playground.zip
  oder
  
• dieses Repository per Git herunterladen und in den Ordner rxjs-playground wechseln.

cd rxjs-playground
npm install
ng serve

Öffne den Browser unter der URL http://localhost:4300 (!), um die Anwendung zu sehen.
Die Übungen befinden sich im Ordner rxjs-playground/src/app/exercises/.

[JohannesHoppe]

// ++ Hands On ++
// 1. Erstelle ein (Event) mit dem Namen "create"
// 2. Versende das neue Buch über das Event
// 3. Subscribe dich auf das Event im Dashboard
// 4. Füge das neue Buch dem Buch-Array hinzu. Achte auf das Theme Immutability und verwende set/update vom Signal.

[JohannesHoppe]

https://api.angular.schule/

[JohannesHoppe]

https://github.com/OpenAPITools/openapi-generator <-- ganz viel Arbeit einsparen!

[JohannesHoppe]

ng g service books/shared/book-store

[JohannesHoppe]

openapi-generator-cli generate -i http://localhost:5000/swagger/v1/swagger.json -g typescript-angular -o ../src/app/shared/my-api

für .NET -- https://github.com/domaindrivendev/Swashbuckle.AspNetCore

[JohannesHoppe]

ng g c books/book-details

[JohannesHoppe]

Hands on (für Mittwoch)

1. Zeige statt der Katzen-Bilder die echten Thumbnails an
2. Optional: Verwende den Open-Api Generator, um einen API-client zu erstellen. (Swagger-Json: https://api.angular.schule/swagger.json / Hinweis: unsere API benötigt den --skip-validate-spec)

[JohannesHoppe]

https://ngschule.de/adresse-ebook

[JohannesHoppe]

https://angular.schule/blog/2024-11-linked-signal
https://angular-buch.com/blog/2024-10-resource-api

[JohannesHoppe]

import { HttpClient } from '@angular/common/http';
import { inject, Injectable } from '@angular/core';
import { Observable } from 'rxjs';
import { Book } from './book';

@Injectable({
  providedIn: 'root'
})
export class BookStoreService {

  http = inject(HttpClient);

  getAll(): Observable<Book[]> {
    return this.http.get<Book[]>('https://api.angular.schule/books');
  }

  getSingle(isbn: string): Observable<Book> {
    return this.http.get<Book>('https://api.angular.schule/books/' + isbn);
  }
}

[JohannesHoppe]

import { JsonPipe } from '@angular/common';
import { Component, inject } from '@angular/core';
import { toSignal } from '@angular/core/rxjs-interop';
import { ActivatedRoute, RouterLink } from '@angular/router';
import { map, mergeMap } from 'rxjs';
import { BookStoreService } from '../shared/book-store.service';

@Component({
  selector: 'app-book-details',
  imports: [JsonPipe, RouterLink],
  templateUrl: './book-details.component.html',
  styleUrl: './book-details.component.scss'
})
export class BookDetailsComponent {

  router = inject(ActivatedRoute);
  bs = inject(BookStoreService);

  book = toSignal(this.router.paramMap.pipe(
    map(p => p.get('isbn') || ''),
    mergeMap(isbn => this.bs.getSingle(isbn))
  ))

}

<pre>
  {{ book() | json }}
</pre>

<a routerLink="/books/9783864909467">Gehe zu Angular</a><br>
<a routerLink="/books/9783864905520">Gehe zu React</a>

[fmalcher]

Neu im Blog: Angular 20 ist da!

https://angular-buch.com/blog/2025-05-angular20