JAVASCRIPT
Creating a useDebounce Custom Hook for React Inputs
Optimize input handling in React with a `useDebounce` hook. Delay state updates until user input pauses, reducing unnecessary re-renders and API calls.
import { useState, useEffect } from 'react';
function useDebounce(value, delay) {
const [debouncedValue, setDebouncedValue] = useState(value);
useEffect(() => {
const handler = setTimeout(() => {
setDebouncedValue(value);
}, delay);
return () => {
clearTimeout(handler);
};
}, [value, delay]);
return debouncedValue;
}
// Example Usage:
function SearchBar() {
const [searchTerm, setSearchTerm] = useState('');
const debouncedSearchTerm = useDebounce(searchTerm, 500);
useEffect(() => {
if (debouncedSearchTerm) {
console.log('Fetching data for:', debouncedSearchTerm);
}
}, [debouncedSearchTerm]);
return (
<input
type="text"
placeholder="Search..."
value={searchTerm}
onChange={(e) => setSearchTerm(e.target.value)}
/>
);
}
How it works: The `useDebounce` hook returns a debounced version of the input `value`. It uses `useEffect` to set a timeout that updates the internal `debouncedValue` state. If the `value` changes before the delay, the previous timeout is cleared, effectively resetting the debounce timer. This prevents actions from firing too frequently, e.g., on every keystroke.