Book Image

Switching to Angular 2

By : Minko Gechev
Book Image

Switching to Angular 2

By: Minko Gechev

Overview of this book

<p>AngularJS is a JavaScript framework that makes building web applications easier. It is used today in large-scale, high-traffic websites that struggle with under-performance, portability issues, as well as SEO unfriendliness, and complexity at scale.</p> <p>Angular 2 changes that.</p> <p>It is the modern framework you need to build performant and robust web applications. “Switching to Angular 2” is the quickest way to get to grips with Angular 2 and will help you transition in to the brave new world of Angular 2.</p> <p>We’ll start with an overview which sets the changes of the framework in context with version 1.x. After that, you will be taken on a TypeScript crash-course so we can take advantage of Angular 2 in its native, statically-typed environment. We’ll look at the new change-detection method in detail, how Directives and Components change how you create websites with Angular, the new Angular 2 router, and much more.</p> <p>By the end of the book, you’ll be ready to start building quick and efficient Angular 2 applications that take advantage of all the new features on offer.</p>

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Switching to Angular 2
Minko Gechev
Mar, 2016 | 254 pages
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Table of Contents (16 chapters)
Switching to Angular 2
Switching to Angular 2
Credits
Credits
Foreword
Foreword
About the Author
About the Author
About the Reviewers
About the Reviewers
www.PacktPub.com
www.PacktPub.com
Preface
Preface
Free Chapter
1
Getting Started with Angular 2
Getting Started with Angular 2
The evolution of the Web – time for a new framework
The evolution of ECMAScript
Lessons learned from AngularJS 1.x in the wild
Summary
2
The Building Blocks of an Angular 2 Application
The Building Blocks of an Angular 2 Application
A conceptual overview of Angular 2
Changing directives
Getting to know Angular 2 components
Pipes
Change detection
Understanding services
Understanding the new component-based router
Summary
3
TypeScript Crash Course
TypeScript Crash Course
Introduction to TypeScript
Using TypeScript
TypeScript syntax and features introduced by ES2015 and ES2016
Meta-programming with ES2016 decorators
Writing modular code with ES2015
ES2015 module loader
ES2015 and ES2016 recap
Taking advantage of static typing
Further expressiveness with TypeScript decorators
Writing generic code by using type parameters
Writing less verbose code with TypeScript's type inference
Using ambient type definitions
Summary
4
Getting Started with Angular 2 Components and Directives
Getting Started with Angular 2 Components and Directives
The Hello world! application in Angular 2
Setting up our environment
Playing with Angular 2 and TypeScript
Using Angular 2 directives
Improved semantics of the directives syntax
Defining Angular 2 directives
Using Angular 2's built-in directives
Introducing the component's view encapsulation
Implementing the component's controllers
Handling user actions
Explaining Angular 2's content projection
Hooking into the component's life cycle
The order of execution
Defining generic views with TemplateRef
Understanding and enhancing the change detection
Summary
5
Dependency Injection in Angular 2
Dependency Injection in Angular 2
Why do I need Dependency Injection?
Dependency Injection in Angular 2
Configuring an injector
Defining factories for instantiating services
Child injectors and visibility
Summary
6
Working with the Angular 2 Router and Forms
Working with the Angular 2 Router and Forms
Developing the "Coders repository" application
Exploring the Angular 2 router
Using Angular 2 forms
Two-way data-binding with Angular 2
Storing the form data
Listing all the stored developers
Summary
7
Explaining Pipes and Communicating with RESTful Services
Explaining Pipes and Communicating with RESTful Services
Developing model-driven forms in Angular 2
Exploring the HTTP module of Angular
Defining parameterized views
Defining nested routes
Transforming data with pipes
Summary
8
Development Experience and Server-Side Rendering
Development Experience and Server-Side Rendering
Running applications in Web Workers
Initial load of a single-page application
Enhancing our development experience
Bootstrapping a project with angular-cli
Angular 2 quick starters
Summary
Index
Index

Further expressiveness with TypeScript decorators

In ES2015, we are able to decorate only classes, properties, methods, getters, and setters. TypeScript takes this further by allowing us to decorate functions or method parameters:

class Http {
  // …
}
class GitHubApi {
  constructor(@Inject(Http) http) {
    // …
  }
}

However, the parameter decorators should not alter any additional behavior. Instead, they are used to generate metadata. The most typical use case of these decorators is the dependency injection mechanism of Angular 2.

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