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React and React Native

You're reading from   React and React Native Build cross-platform JavaScript apps with native power for mobile, web and desktop

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Product type Paperback
Published in Mar 2017
Publisher Packt
ISBN-13 9781786465658
Length 500 pages
Edition 1st Edition
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Author (1):
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Adam Boduch Adam Boduch
Author Profile Icon Adam Boduch
Adam Boduch
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Table of Contents (27) Chapters Close

Preface 1. Why React? FREE CHAPTER 2. Rendering with JSX 3. Understanding Properties and State 4. Event Handling – The React Way 5. Crafting Reusable Components 6. The React Component Lifecycle 7. Validating Component Properties 8. Extending Components 9. Handling Navigation with Routes 10. Server-Side React Components 11. Mobile-First React Components 12. Why React Native? 13. Kickstarting React Native Projects 14. Building Responsive Layouts with Flexbox 15. Navigating Between Screens 16. Rendering Item Lists 17. Showing Progress 18. Geolocation and Maps 19. Collecting User Input 20. Alerts, Notifications, and Confirmation 21. Responding to User Gestures 22. Controlling Image Display 23. Going Offline 24. Handling Application State 25. Why Relay and GraphQL? 26. Building a Relay React App

Rendering data collections

Let's start with a basic example. The React Native component you'll use to render lists is ListView, which works the same way on iOS and Android. List views take a data source property, which must be a ListView.DataSource instance. Don't worry; it's really just a wrapper around an array in most cases. The reason that the ListView component expects this type of data source is so that it can perform efficient rendering. Lists can be long and updating them frequently can cause performance issues.

So, let's implement a basic list now, shall we? Here's the code to render a basic 100-item list:

import React from 'react'; 
import { 
  AppRegistry, 
  Text, 
  View, 
  ListView, 
} from 'react-native'; 
 
import styles from './styles'; 
 
// You always need a comparator function that's 
// used to determine whether or not a row has 
// changed. Even in simple cases like this, where 
// strict inequality is...
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