Diskussionsthread zur Schulung

[JohannesHoppe]

Hier können wir während des Workshops Links und Codeschnipsel teilen.

[JohannesHoppe]

TypeScript: useDefineForClassFields – zukünftige Breaking Changes vermeiden

https://angular-buch.com/blog/2022-11-use-define-for-class-fields
https://angular.schule/blog/2022-11-use-define-for-class-fields

[JohannesHoppe]

ng lint

[JohannesHoppe]

app.component.html – mit 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>

[JohannesHoppe]

ng g c books/dashboard

[JohannesHoppe]

Bitte bis morgen

a) Artikel durchlesen (useDefineForClassFields)
b) AngularDev Tools installieren

[JohannesHoppe]

wir machen ein

Anemic Domain Model

[JohannesHoppe]

ng g i books/shared/book

[JohannesHoppe]

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

[JohannesHoppe]

import { Pipe, PipeTransform } from '@angular/core';

@Pipe({
  name: 'blubb'
})
export class BlubbPipe implements PipeTransform {

  transform(value: string): string {
    return 'blubb';
  }

}

[JohannesHoppe]

ng g c books/book

[JohannesHoppe]

book.component.html

<div class="card mb-4">
  <div class="card-body bg-light">
      <img class="img-thumbnail float-end" alt="" src="https://api.angular.schule/avatar/{{ book().rating }}">
    <div class="card-title">
      <h2 [ngClass]="{ 'text-success': tollesBuch() }">
        {{ book().title }}
        <span class="badge bg-secondary">{{ book().rating }}</span>
      </h2>
    </div>
    <p>{{ book().description }}</p>
  </div>
</div>

[JohannesHoppe]

Hands on (für Freitag)

Zeige die Bewertung eines Buchs mit Sternsymbolen an. Du kannst Bilder verwenden, das '⭐️' Zeichen oder einen anderen Weg wählen. Probiere gerne auch eine eigene Component aus.

Hinweis: Wir wollen natürlich nicht *ngFor verwenden (alte Syntax)!

[JohannesHoppe]

ratingStars = computed(() => {
    let stars: string[] = [];
    for(let idx = 0; idx < this.book().rating; idx++){
      stars.push('⭐');
    }
    return stars;
  });

@for (ratingStar of ratingStars(); track $index){
          <span>{{ratingStar}}</span>
        }
        ```

[JohannesHoppe]

@for (item of [].constructor(book().rating); track item) {
              <i>*</i>
            }

[Darph81]

Lösung mit Sprite
-> component.ts

import { NgStyle } from '@angular/common';
import { Component, computed, input } from '@angular/core';

@Component({
  selector: 'app-star-rating',
  standalone: true,
  imports: [NgStyle],
  templateUrl: './star-rating.component.html',
  styleUrl: './star-rating.component.scss'
})
export class StarRatingComponent {
  starCount = input.required<number>();
  readonly starHPos = computed<string>(() => { 
    let count = 170 -  (this.starCount() * 32);
    return count+'px';
  });
}

-> Template.html
<span class="sprite" [style.background-position-x]="starHPos()"> </span>

-> css

.sprite {
    background-image: url('../../../assets/images/ratings.png');
    background-repeat: no-repeat;
    display: inline-block;
    width: 174px;
    height: 32px;
}

[JohannesHoppe]

[JohannesHoppe]

Hands On (für Montag)

Teste die Anwendung mit einem e2e-Test-Tool deiner Wahl!

ng e2e

[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">Die ISBN ist ungültig!</div>
    }
  </div>

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

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

  <div class="form-group">
    <label for="rating">Bewertung</label>
    <input type="number" class="form-control" id="rating">
  </div>

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

</form>

[JohannesHoppe]

// Hands On:
// 1. Erstelle ein Event mit dem Namen `create`
// 2. Emitte das Event mit dem neuen Buch
// 3. Binde dich auf das Event im Dashboard (runde Klammern)
// 4. Füge das neue Buch dem Buch-Array hinzu (immutable, z. B. mit Spread Operator)

[JohannesHoppe]

Hands On (für Dienstag)

1.

Beende die Übung zum create-Event.

2.

Durch die Logik im Template der BookComponent, ist diese zu schlau geworden! Fixe den Code, so dass dieser wieder dem Smart/Dumb Components Pattern entspricht.

Option:

1. Input: minRating: number / maxRating: number
2. Input: rateUpAllowed: boolean / rateDownAllowed: boolean
3. Input: rateUpAllowedCallback / rateDownAllowedCallback

[JohannesHoppe]

🎮 NEU: RxJS Playground installieren

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]

ng g service books/shared/book-store

[JohannesHoppe]

TODO

Zeige Buch-Thumbnails statt Katzenfotos an.

[JohannesHoppe]

ng g c books/book-details

[JohannesHoppe]

Alles wichtige zu Angular 18

angular-buch/website-articles#28

[JohannesHoppe]

ng g environments

[JohannesHoppe]

import { toSignal } from '@angular/core/rxjs-interop';

[JohannesHoppe]

NgRx einrichten – heute ausnahmsweise mit @next, damit wir Version 18.0.0-rc.0 bekommen:

ng add @ngrx/store@next
ng add @ngrx/store-devtools@next
ng add @ngrx/effects@next
ng add @ngrx/schematics@next

ng g feature books/store/book --api --entity=false --defaults

[JohannesHoppe]

import { JsonPipe } from '@angular/common';
import { HttpErrorResponse } from '@angular/common/http';
import { Component, inject } from '@angular/core';
import { toSignal } from '@angular/core/rxjs-interop';
import { ActivatedRoute, RouterLink } from '@angular/router';
import { catchError, map, of, retry, switchMap } from 'rxjs';

import { BookStoreService } from '../shared/book-store.service';

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

  route = inject(ActivatedRoute);
  bookStore = inject(BookStoreService);

  book = toSignal(this.route.paramMap.pipe(
    map(paramMap => paramMap.get('isbn') || ''),
    switchMap(isbn => this.bookStore.getSingleBook(isbn).pipe(
      retry({
        count: 3,
        delay: 100
      }),
      catchError((err: HttpErrorResponse) => of({
        title: 'ERROR',
        description: err.message
      }))
    ))
  ));

}

```html
@if (book(); as book) {

  <h2>{{ book.title }}</h2>
  <p>{{ book.description }}</p>

}

<a routerLink="/books/9783864909467">Gehe zu Angular</a><br>
<a routerLink="/books/7879789789">Gehe zum besten Buch der Welt</a><br>
<a routerLink="/books/404">Gehe zum Fehler</a>