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Learning Angular

Learning Angular

By : Aristeidis Bampakos, Pablo Deeleman
3.4 (16)
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Learning Angular

Learning Angular

3.4 (16)
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)
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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

Manipulating form data

The FormGroup class contains two methods that we can use to change the values of a form programmatically:

  • setValue: Replaces values in all the controls of the form
  • patchValue: Updates values in specific controls of the form

The setValue method accepts an object as a parameter that contains key-value pairs for all the controls of the form. Let's add a button to our heroDetails form that creates a new hero in order to illustrate the usage of setValue:

  1. Open the hero.component.html file and add a button element named Add hero before the button that adds powers.
  2. Bind the click event of the Add hero button to a component method named addHero:
    <button (click)="addHero()">Add hero</button>
  3. Open the hero.component.ts file and add the addHero method, which uses the setValue method to fill in the form with details of a new hero:
    addHero() {
      this.heroDetails.setValue({
       ...

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