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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Modifying forms dynamically

So far, we have used the FormGroup and FormControl classes extensively throughout this chapter. However, we have not seen what FormArray is all about. Consider the scenario where we have added some products to the shopping cart of our e-shop application and want to update their quantities before checking out the order.

Currently, our application does not have any functionality for a shopping cart, so we will now add one:

  1. Create a new service to manage the shopping cart by running the following Angular CLI command in the src\app\cart folder:
ng generate service cart
  1. Open the cart.service.ts file and add the following import statement:
import { Product } from '../products/product';
  1. Create a cart property in the CartService class and initialize it to an empty array:
export class CartService {
  cart: Product[] = [];
  constructor() { }

The preceding cart property will be an intermediate local...