Last active
August 30, 2022 08:58
-
-
Save luismartinezs/5f06391451660f5fbd5d680f24fe3202 to your computer and use it in GitHub Desktop.
react useInterval #react #hooks
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
// https://overreacted.io/making-setinterval-declarative-with-react-hooks/ | |
import React, { useState, useEffect, useRef } from "react"; | |
import ReactDOM from "react-dom"; | |
function Counter() { | |
const [count, setCount] = useState(0); | |
const [delay, setDelay] = useState(1000); | |
useInterval(() => { | |
// Your custom logic here | |
setCount(count + 1); | |
}, delay); | |
function handleDelayChange(e) { | |
setDelay(Number(e.target.value)); | |
} | |
return ( | |
<> | |
<h1>{count}</h1> | |
<input value={delay} onChange={handleDelayChange} /> | |
</> | |
); | |
} | |
function useInterval(callback, delay) { | |
const savedCallback = useRef(); | |
// Remember the latest function. | |
useEffect(() => { | |
savedCallback.current = callback; | |
}, [callback]); | |
// Set up the interval. | |
useEffect(() => { | |
function tick() { | |
savedCallback.current(); | |
} | |
if (delay !== null) { | |
let id = setInterval(tick, delay); | |
return () => clearInterval(id); | |
} | |
}, [delay]); | |
} | |
const rootElement = document.getElementById("root"); | |
ReactDOM.render(<Counter />, rootElement); |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment