Book Image

React and React Native - Third Edition

By : Adam Boduch, Roy Derks
Book Image

React and React Native - Third Edition

By: Adam Boduch, Roy Derks

Overview of this book

React and React Native, Facebook’s innovative User Interface (UI) libraries, are designed to help you build robust cross-platform web and mobile applications. This updated third edition is improved and updated to cover the latest version of React. The book particularly focuses on the latest developments in the React ecosystem, such as modern Hook implementations, code splitting using lazy components and Suspense, user interface framework components using Material-UI, and Apollo. In terms of React Native, the book has been updated to version 0.62 and demonstrates how to apply native UI components for your existing mobile apps using NativeBase. You will begin by learning about the essential building blocks of React components. Next, you’ll progress to working with higher-level functionalities in application development, before putting this knowledge to use by developing user interface components for the web and for native platforms. In the concluding chapters, you’ll learn how to bring your application together with a robust data architecture. By the end of this book, you’ll be able to build React applications for the web and React Native applications for multiple mobile platforms.
Table of Contents (33 chapters)
Section 1: React
Section 2: React Native
Section 3: React Architecture

Using synthetic event objects

When you attach an event handler function to a DOM element using the native addEventListener() function, the callback will get an event argument passed to it. Event handler functions in React are also passed an event argument, but it's not the standard Event instance. It's called SyntheticEvent, and it's a simple wrapper for native event instances.

Synthetic events serve two purposes in React:

  • They provide a consistent event interface, normalizing browser inconsistencies.
  • Synthetic events contain information that's necessary for propagation to work.

Here's a diagram of the synthetic event in the context of a React component:

When a DOM element that is part of a React component dispatches an event, React will handle the event because it sets up its own listeners for them. Then, it will either create a new synthetic event or will reuse one from the pool depending on availability. If there are any event handlers declared for the component...