Book Image

Learning Angular - Fourth Edition

By : Aristeidis Bampakos, Pablo Deeleman
5 (1)
Book Image

Learning Angular - Fourth Edition

5 (1)
By: Aristeidis Bampakos, Pablo Deeleman

Overview of this book

As Angular continues to reign as one of the top JavaScript frameworks, more developers are seeking out the best way to get started with this extraordinarily flexible and secure framework. Learning Angular, now in its fourth edition, will show you how you can use it to achieve cross-platform high performance with the latest web techniques, extensive integration with modern web standards, and integrated development environments (IDEs). The book is especially useful for those new to Angular and will help you to get to grips with the bare bones of the framework to start developing Angular apps. You'll learn how to develop apps by harnessing the power of the Angular command-line interface (CLI), write unit tests, style your apps by following the Material Design guidelines, and finally, deploy them to a hosting provider. Updated for Angular 15, this new edition covers lots of new features and tutorials that address the current frontend web development challenges. You’ll find a new dedicated chapter on observables and RxJS, more on error handling and debugging in Angular, and new real-life examples. By the end of this book, you’ll not only be able to create Angular applications with TypeScript from scratch, but also enhance your coding skills with best practices.
Table of Contents (17 chapters)
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Subscribing to observables

We have already learned that an observer needs to subscribe to an observable in order to start getting emitted data. Our products and product-view services currently emit product data using observables. We must modify their respective components to subscribe and get these data:

  1. Open the product-list.component.ts file and create a getProducts method in the ProductListComponent class:
private getProducts() {
  this.productService.getProducts().subscribe(products => {
    this.products = products;
  1. In the preceding method, we subscribe to the getProducts method of the ProductsService class because it returns an observable instead of a plain products array. The products array is returned inside the subscribe method, where we set the products component property to the array emitted from the observable.
  2. Modify the ngOnInit method so that it calls the newly created getProducts method:
ngOnInit(): void {
  1. We could have added...