useWindowSize Hook

Returns the size of the window. This hook can be used for rendering elements at varying screen widths. To use it you should create a variable that calls useWindowSize. The screen width can then be accessed using 'variableName.width'.

import { useState, useEffect } from 'react';

export function useWindowSize() {
  // Initialize state with undefined width/height so server and client renders match
  // Learn more here: https://joshwcomeau.com/react/the-perils-of-rehydration/
  const [windowSize, setWindowSize] = useState({
    width: undefined,
    height: undefined,
  });
  useEffect(() => {
    // Handler to call on window resize
    function handleResize() {
      // Set window width/height to state
      setWindowSize({
        width: window.innerWidth,
        height: window.innerHeight,
      });
    }
    // Add event listener
    window.addEventListener('resize', handleResize);
    // Call handler right away so state gets updated with initial window size
    handleResize();
    // Remove event listener on cleanup
    return () => window.removeEventListener('resize', handleResize);
  }, []); // Empty array ensures that effect is only run on mount
  return windowSize;
}

Vaiva's Pattern Library.

useWindowSize Hook

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