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

Chapter 8: Orchestrating Validation Experiences in Forms

Web applications use forms when it comes to collecting data from the user. Use cases vary from allowing a user to log in, filling in payment information, booking a flight, or even performing a search. Form data can later be persisted on local storage or be sent to a server using a backend API. A form usually has the following characteristics that enhance the user experience of a web app:

  • Can define different kinds of input fields
  • Can set up different kinds of validations and display validation errors to the user
  • Can support different strategies for handling data in case the form is in an error state

The Angular framework provides two approaches to handle forms: template-driven and reactive. Neither approach is considered better than the other; you just have to go with the one that suits your scenario the best. The main difference between the two approaches is how they manage data:

  • Template-driven...