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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Enhancing navigation with advanced features

So far, we have covered basic routing, with route parameters as well as query parameters. The Angular router is quite capable, though, and able to do much more, such as the following:

  • Controlling access to a route
  • Preventing navigation away from a route
  • Prefetching data to improve the UX
  • Lazy loading routes to speed up the response time

In the following sections, we will learn about all these techniques in more detail.

Controlling route access

When we want to prevent unauthorized access to a particular route, we use a specific Angular service called a guard. To create a guard, we use the generate command of the Angular CLI, passing its name as a parameter. To create a guard that will allow access to a route depending on whether the user is authenticated or not, we will run the following command in the src\app\auth folder:

ng generate guard auth

When we execute the previous command, the Angular...