Book Image

Angular 2 Components

By : Thierry Templier Thierry
Book Image

Angular 2 Components

By: Thierry Templier Thierry

Overview of this book

This book is a concise guide to Angular 2 Components and is based on the stable version of Angular 2. You will start with learning about the Angular 2 Components architecture and how components differ from Angular directives in Angular 1. You will then move on to quickly set up an Angular 2 development environment and grasp the basics of TypeScript. With this strong foundation in place, you will start building components. The book will teach you, with an example, how to define component behavior, create component templates, and use the controller of your component. You will also learn how to make your components communicate with each other. Once you have built a component, you will learn how to extend it by integrating third-party components with it. By the end of the book, you will be confident with building and using components for your applications.
Table of Contents (16 chapters)
Angular 2 Components
Credits
About the Authors
About the Reviewers
www.PacktPub.com
Preface
Index

Event bindings


Up until now, we learned about two kinds of data binding: interpolation (using the curly braces) and properties binding. Both of them are considered to be one-way data binding from the data source to the view. In real life, our component should be able to respond to user events. Luckily, in Angular 2, this is simple as property binding.

We can respond to any native DOM event by surrounding it with parentheses and assign it to a method on the component class. Let's see how we can respond to the click event on our button. We need to wrap the click event of the button in parentheses, and assign a method that will be invoked in return:

@Component({
  selector: 'app-root',
  template: `
    <button (click)="clickHandler()">
      click me!</button> 
  `
})
export class AppComponent {
  clickHandler() {
    console.log('button clicked!');
  }
}

Let's use data binding techniques to create a simple toggle component:

@Component({
  selector: 'app-root',
  template: `    
 ...