Welcome back to the third installment of our React Hooks series! In the previous blog posts, we delved into the fascinating world of hooks, exploring their significance and discussing essential hooks like useState
, useEffect
, useContext
, and useReducer
. These hooks empower us to replicate class-based component functionality in functional components and create a simplified Redux store. In the upcoming articles, we'll delve deeper into Redux. However, for now, let's focus on the useRef
hook.
useRef
:The useRef
hook is a powerful tool that grants us access to DOM nodes and allows us to persist data across rerenders. In this blog post, we'll explore how to leverage useRef
for various scenarios.
One primary use case for useRef
is gaining access to DOM elements. Let's consider an example where we use useRef
on an input element to focus on it after a click event. Additionally, we utilize the .current
property to retain the input's value. Here's a snippet of how it can be implemented:
import React, { useRef } from 'react';
const RefFunctionComponent = () => {
const bestEredivisieClub = useRef('Ajax');
const focusRef = () => {
bestEredivisieClub.current.focus();
};
return (
<div>
<input
ref={bestEredivisieClub}
type="text"
value={bestEredivisieClub.current}
/>
<button onClick={focusRef}>Focus on the ref object</button>
</div>
);
};
export default RefFunctionComponent;
Unlike the createRef
API, which provides a new value after each rerender, useRef
maintains its value throughout successive rerenders. In the following example, we compare the behavior of createRef
and useRef
when changing values after a specific time interval:
import React, { useRef, useState, createRef, useEffect } from 'react';
const RefFunctionComponent = () => {
const [rerender, setRerender] = useState(1);
const useRefHook = useRef('Ajax');
const createRefAPI = createRef();
createRefAPI.current = 'Ajax';
useEffect(() => {
setTimeout(() => {
useRefHook.current = 'PSV';
createRefAPI.current = 'PSV';
console.log(useRefHook, createRefAPI);
}, 5000);
}, []);
return (
<>
<p>Aantal keer gererendered: {rerender}</p>
<p>
<b>useRef</b> Wat is de slechtste club: {useRefHook.current}
</p>
<p>
<b>CreateRef</b> Wat is de beste club:{createRefAPI.current}
</p>
<button onClick={() => setRerender((v) => v + 1)}>
Cause re-render
</button>
</>
);
};
export default RefFunctionComponent;
As demonstrated, the useRef
hook is a valuable addition to your React toolkit, providing seamless access to DOM elements and enabling the preservation of values across rerenders. Stay tuned for our next blog article, where we'll explore useMemo
and useCallback
. If you require assistance with your React project, our professionals are always ready to lend a helping hand.
For professional React development support, feel free to reach out to us!
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