Book Image

Architecting Angular Applications with Redux, RxJS, and NgRx

By : Christoffer Noring
Book Image

Architecting Angular Applications with Redux, RxJS, and NgRx

By: Christoffer Noring

Overview of this book

Managing the state of large-scale web applications is a highly challenging task with the need to align different components, backends, and web workers harmoniously. When it comes to Angular, you can use NgRx, which combines the simplicity of Redux with the reactive programming power of RxJS to build your application architecture, making your code elegant and easy to reason about, debug, and test. In this book, we start by looking at the different ways of architecting Angular applications and some of the patterns that are involved in it. This will be followed by a discussion on one-way data flow, the Flux pattern, and the origin of Redux. The book introduces you to declarative programming or, more precisely, functional programming and talks about its advantages. We then move on to the reactive programming paradigm. Reactive programming is a concept heavily used in Angular and is at the core of NgRx. Later, we look at RxJS, as a library and master it. We thoroughly describe how Redux works and how to implement it from scratch. The two last chapters of the book cover everything NgRx has to offer in terms of core functionality and supporting libraries, including how to build a micro implementation of NgRx. This book will empower you to not only use Redux and NgRx to the fullest, but also feel confident in building your own version, should you need it.
Table of Contents (12 chapters)

Adding AJAX calls

So far, we have only been dealing with static data in our Flux flow. The time has now come to add real data connections to the flow and thereby real data. It is time to start talking to APIs through AJAX and HTTP. Fetching data is quite easy nowadays, thanks to the fetch API and libraries such as RxJS. What you need to think about when incorporating it in the flow is:

  • Where to place the HTTP call
  • How to ensure that the store is updated and interested views are notified

We have a point at which we register the store to the dispatcher, with this piece of code:

// excerpt from store-actions-immutable.js

const createProduct = (product) => {
if (!store["products"]) {
store["products"] = [];

store.products = [, Object.assign(product)];

dispatcher.register(({ type, data }) => {
switch (type) {