Book Image

Designing React Hooks the Right Way

By : Fang Jin
Book Image

Designing React Hooks the Right Way

By: Fang Jin

Overview of this book

React hook creates a unique solution for using states in function components to orchestrate UI communication. They provide you with an easy interface to write custom data management solutions with low development and maintenance costs. Understanding how Hooks are designed enables you to use them more effectively, and this book helps you to do just that. This book starts with a custom-crafted solution to reveal why Hooks are needed in the first place. You will learn about the React engine and discover how each built-in Hook can manage a persistent value by hooking into it. You will walk through the design and implementation of each hook with code so that you gain a solid understanding. Finally, you'll get to grips with each Hook's pitfalls and find out how to effectively overcome them. By the end of this React book, you'll have gained the confidence to build and write Hooks for developing functional and efficient web applications at scale.
Table of Contents (12 chapters)

Test driving useRef

There's always a chance that React runs short in terms of controlling the internals of a DOM element. Say there's an input and a button, as in Figure 8.4. Upon a button click, we want to manually focus on the input:

Figure 8.4 – Focus input

Normally, if we click the button, it gets focused, and if we click somewhere else, it loses focus. But in this case, after we click the Focus button, we want to focus the input instead of the button so that the user can type right away.

Let's see how we can apply useRef to make this happen:

const Title = () => {
  const ref = useRef()
  const onClick = () => { 
  return (
      <input ref={ref} />
      <button onClick={onClick}>focus</button>