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  • Getting Started with Angular - Second edition
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Getting Started with Angular - Second edition

Getting Started with Angular - Second edition

By : Minko Gechev
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Getting Started with Angular - Second edition

Getting Started with Angular - Second edition

By: Minko Gechev

Overview of this book

Want to build quick and robust web applications with Angular? This book is the quickest way to get to grips with Angular and take advantage of all its new features.
Table of Contents (9 chapters)
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Preface
Preface
What this book covers
What you need for this book
Who this book is for
Conventions
Reader feedback
Customer support
Free Chapter
1
1. Get Going with Angular
1. Get Going with Angular
Angular and semver
The evolution of the Web - time for a new framework
The evolution of ECMAScript
Lessons learned from AngularJS in the wild
Summary
2
2. The Building Blocks of an Angular Application
2. The Building Blocks of an Angular Application
A conceptual overview of Angular
Changing directives
Getting to know Angular components
Angular modules
Pipes
Improving change detection
Services
The new router
Summary
3
3. TypeScript Crash Course
3. 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
4. Getting Started with Angular Components and Directives
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4. Getting Started with Angular Components and Directives
The "Hello world!" application in Angular
Using TypeScript
Playing with Angular and TypeScript
Using Angular directives
Improved semantics of the directives syntax
Defining Angular directives
Creating custom Angular components
Explaining Angular's content projection
Hooking into the component's life cycle
Defining generic views with TemplateRef
Understanding and enhancing the change detection
Summary
5
5. Dependency Injection in Angular
5. Dependency Injection in Angular
Why do I need DI?
DI in Angular
Configuring an injector
Defining factories for instantiating services
Child injectors and visibility
Summary
6
6. Working with the Angular Router and Forms
6. Working with the Angular Router and Forms
Developing the "Coders repository" application
Exploring the Angular router
Using Angular's forms module
Two-way data binding with Angular
Storing the form data
Listing all the stored data
Summary
7
7. Explaining Pipes and Communicating with RESTful Services
7. Explaining Pipes and Communicating with RESTful Services
Developing model-driven forms in Angular
Exploring the HTTP module of Angular
Defining parameterized views
Defining nested routes
Transforming data with pipes
Summary
8
8. Tooling and Development Experience
8. Tooling and Development Experience
Running an application in a Web Worker
Initial load of a SPA
Enhancing our development experience
Angular quick starters
AoT compilation in Angular
Summary

Hooking into the component's life cycle

Components in Angular have a well-defined life cycle, which allows us to hook into different phases of it and have further control over our application. We can do this by implementing specific methods in the component's controller. In order to be more explicit, thanks to the expressiveness of TypeScript, we can implement different interfaces associated with the life cycle's phases. Each of these interfaces has a single method, which is associated with the phase itself.

Although code written with explicit interface implementation will have better semantics, since Angular supports ES5 as well, within the component we can simply define methods with the same names as the life cycle hooks (but this time, prefixed with ng) and take advantage of duck typing.

The following diagram shows all the phases we can hook into:

Figure 10

Let's take a look at the different life cycle hooks:

  • OnChanges: This hook will be invoked once a change in the input properties of...

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