Book Image

Angular 2 Components

By : Robin Böhm, Nir Kaufman, Thierry Templier Thierry
Book Image

Angular 2 Components

By: Robin Böhm, Nir Kaufman, 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
About the Authors
About the Reviewers

Using decorators

Decorators are functions that modify a class, property, method, or method parameter. The following example illustrates how to define and use a simple decorator that adds a static parameter to the class:

// decorator function
function AddMetadata (...args) {
  return function (target){
    target.metadata = [...args];

// decorator applied
@AddMetadata({ metadata: 'some values'})
class Model {

The three dots syntax (...) is the spread operator, which is a feature of JavaScript 2015 that deconstructs the items of a given array.

Decorators versus annotations

You might have heard the term annotations; they are simply metadata related to Angular 2. Before the Angular team decided to use TypeScript, they introduced us to a new language that they called AtScript. This language included a feature called annotations, which look exactly like decorators. So what's the difference? The decorator is an interface for creating those Angular annotations. Decorators are executed and in...