41 lines
1.2 KiB
Markdown
41 lines
1.2 KiB
Markdown
---
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title: React useOnWindowResize hook
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tags: hooks,effect,event
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expertise: intermediate
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author: chalarangelo
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cover: blog_images/flower-camera.jpg
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firstSeen: 2021-12-01T05:00:00-04:00
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---
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Executes a callback whenever the window is resized.
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- Use the `useRef()` hook to create a variable, `listener`, which will hold the listener reference.
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- Use the `useEffect()` hook and `EventTarget.addEventListener()` to listen to the `'resize'` event of the `Window` global object.
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- Use `EventTarget.removeEventListener()` to remove any existing listeners and clean up when the component unmounts.
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```jsx
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const useOnWindowResize = callback => {
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const listener = React.useRef(null);
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React.useEffect(() => {
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if (listener.current)
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window.removeEventListener('resize', listener.current);
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listener.current = window.addEventListener('resize', callback);
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return () => {
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window.removeEventListener('resize', listener.current);
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};
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}, [callback]);
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};
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```
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```jsx
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const App = () => {
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useOnWindowResize(() =>
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console.log(`window size: (${window.innerWidth}, ${window.innerHeight})`)
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);
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return <p>Resize the window and check the console</p>;
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};
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ReactDOM.render(<App />, document.getElementById('root'));
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```
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