React useOnWindowScroll hook

React, Hooks, Effect, Event · Dec 8, 2021

Executes a callback whenever the window is scrolled.

  • Use the useRef() hook to create a variable, listener, which will hold the listener reference.
  • Use the useEffect() hook and EventTarget.addEventListener() to listen to the 'scroll' event of the Window global object.
  • Use EventTarget.removeEventListener() to remove any existing listeners and clean up when the component unmounts.
const useOnWindowScroll = callback => {
  const listener = React.useRef(null);

  React.useEffect(() => {
    if (listener.current)
      window.removeEventListener('scroll', listener.current);
    listener.current = window.addEventListener('scroll', callback);
    return () => {
      window.removeEventListener('scroll', listener.current);
  }, [callback]);
const App = () => {
  useOnWindowScroll(() => console.log(`scroll Y: ${window.pageYOffset}`));
  return <p style={{ height: '300vh' }}>Scroll and check the console</p>;

ReactDOM.render(<App />, document.getElementById('root'));

Written by Angelos Chalaris

I'm Angelos Chalaris, a JavaScript software engineer, based in Athens, Greece. The best snippets from my coding adventures are published here to help others learn to code.

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