Book Image

React and React Native

By : Adam Boduch
Book Image

React and React Native

By: Adam Boduch

Overview of this book

para 1: Dive into the world of React and create powerful applications with responsive and streamlined UIs! With React best practices for both Android and iOS, this book demonstrates React and React Native in action, helping you to create intuitive and engaging applications. Para 2: React and React Native allow you to build desktop, mobile and native applications for all major platforms. Combined with Flux and Relay, you?ll be able to create powerful and feature-complete applications from just one code base. Para 3: Discover how to build desktop and mobile applications using Facebook?s innovative UI libraries. You?ll also learn how to craft composable UIs using React, and then apply these concepts to building Native UIs using React Native. Finally, find out how you can create React applications which run on all major platforms, and leverage Relay for feature-complete and data-driven applications. Para 4: What?s Inside ? Craft composable UIs using React & build Native UIs using React Native ? Create React applications for major platforms ? Access APIs ? Leverage Relay for data-driven web & native mobile applications
Table of Contents (34 chapters)
React and React Native
Credits
About the Author
About the Reviewer
www.PacktPub.com
Customer Feedback
Dedication
Preface

Synchronizing application data


So far in this chapter, you've learned how to detect the state of a network connection, and how to store data locally in a React Native application. Now it's time to combine these two concepts and implement an app that can detect network outages and continue to function.

The basic idea is to only make network requests when we know for sure that the device is online. If we know that it isn't, we can store any changes in state locally. Then, when we're back online, we can synchronize those stored changes with the remote API.

Let's implement a simplified React Native app that does this. The first step is implementing an abstraction that sits between the React components and the network calls that store data. We'll call this module store.js:

import { 
  NetInfo, 
  AsyncStorage, 
} from 'react-native'; 
import { Map as ImmutableMap } from 'immutable'; 
 
// Mock data that would otherwise come from a real 
// networked API endpoint...