JAVASCRIPT
Custom useWindowSize Hook to Track Window Dimensions
Develop a `useWindowSize` custom React hook to efficiently track and provide the current browser window's width and height for responsive components.
import { useState, useEffect } from 'react';
function useWindowSize() {
const [windowSize, setWindowSize] = useState({
width: typeof window !== 'undefined' ? window.innerWidth : 0,
height: typeof window !== 'undefined' ? window.innerHeight : 0,
});
useEffect(() => {
function handleResize() {
setWindowSize({
width: window.innerWidth,
height: window.innerHeight,
});
}
// Only add listener if window is defined (client-side)
if (typeof window !== 'undefined') {
window.addEventListener('resize', handleResize);
handleResize(); // Set initial size
return () => window.removeEventListener('resize', handleResize);
}
}, []); // Empty array ensures effect runs only once on mount
return windowSize;
}
// Example Usage:
// function ResponsiveComponent() {
// const { width, height } = useWindowSize();
// return (
// <div>
// <p>Window Width: {width}px</p>
// <p>Window Height: {height}px</p>
// {width < 768 ? <p>Small Screen</p> : <p>Large Screen</p>}
// </div>
// );
// }
How it works: The `useWindowSize` hook provides the current width and height of the browser window, updating them whenever the window is resized. It uses `useState` to store the dimensions and `useEffect` to add and remove a `resize` event listener on the `window` object. This hook is crucial for creating responsive components that adapt their layout or content based on screen dimensions.