Building an Angular App: PART 2

Angular Services and Components

In Part 2 of our Angular series, we dive into creating services and components — the building blocks of any Angular application.

Creating a Service

Services in Angular are classes decorated with @Injectable() that encapsulate business logic and data access. They follow the single responsibility principle and can be injected into components via dependency injection.

@Injectable({
  providedIn: 'root'
})
export class PostService {
  getPosts(): Observable<Post[]> {
    return this.http.get<Post[]>(this.apiUrl);
  }
}

Building Components

Components control patches of screen called views. Each component consists of a TypeScript class, an HTML template, and optional CSS styles. The @Component decorator identifies the class as a component and provides the template and style configuration.

Data Binding

Angular supports several forms of data binding: interpolation, property binding, event binding, and two-way binding with [(ngModel)]. These mechanisms keep the template and component class in sync.