JAVASCRIPT
Custom useDebounce Hook for Input Fields
Create a reusable custom React hook, `useDebounce`, to delay expensive operations like API calls until the user stops typing, improving performance.
import React, { 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;
}
function SearchInput() {
const [searchTerm, setSearchTerm] = useState('');
const debouncedSearchTerm = useDebounce(searchTerm, 500);
useEffect(() => {
if (debouncedSearchTerm) {
console.log('Searching for:', debouncedSearchTerm); // Simulate API call
} else {
console.log('Search term cleared');
}
}, [debouncedSearchTerm]);
return (
<input
type="text"
placeholder="Type to search..."
value={searchTerm}
onChange={(e) => setSearchTerm(e.target.value)}
/>
);
}
export default SearchInput;
How it works: This custom `useDebounce` hook provides a practical solution for delaying updates or side effects, commonly used in search inputs to prevent making an API request on every keystroke. It utilizes `useState` to hold the debounced value and `useEffect` with a cleanup function to manage a timer. The effect runs whenever the `value` or `delay` changes, resetting the timer. The `debouncedValue` is only updated after the specified `delay`, ensuring that expensive operations are only performed when the user has paused typing.