Book Image

Learning Angular - Third Edition

By : Aristeidis Bampakos, Pablo Deeleman
Book Image

Learning Angular - Third Edition

By: Aristeidis Bampakos, Pablo Deeleman

Overview of this book

Angular, loved by millions of web developers around the world, continues to be one of the top JavaScript frameworks thanks to its regular updates and new features that enable fast, cross-platform, and secure frontend web development. With Angular, you can achieve high performance using the latest web techniques and extensive integration with web tools and integrated development environments (IDEs). Updated to Angular 10, this third edition of the Learning Angular book covers new features and modern web development practices to address the current frontend web development landscape. If you are new to Angular, this book will give you a comprehensive introduction to help you get you up and running in no time. 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. The book is especially useful for beginners to get to grips with the bare bones of the framework needed to start developing Angular apps. 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 (19 chapters)
1
Section 1: Getting Started with Angular
4
Section 2: Components – the Basic Building Blocks of an Angular App
9
Section 3: User Experience and Testability
15
Section 4: Deployment and Practice

Authenticating with HTTP

Let's consider that we are working with a backend API that expects all requests to include a custom header named Authorization. In this case, we should refactor the HeroService methods to include this header in each HTTP request. For example, the getHeroes method should transform into the following:

getHeroes(): Observable<Hero[]> {
  return this.http.get<Hero[]>(this.heroesUrl, {
    headers: new HttpHeaders({'Authorization': 'myAuthToken'})
  });
}

For the sake of simplicity, we are using a hardcoded value for the authentication token. In a real-world scenario, we may get it from the local storage of the browser or some other means.

All HttpClient methods that we have met so far accept an optional object as a parameter that is used to pass additional options to a request. These options can be a custom header, as in our case, or even query...