react js : detect page refresh

The event beforeunload is executed just before window browser is being refreshed. Event is cancellable.

window.beforeunload = (e) => {
  console.log('Stop this');
  e.preventDefault()
  e.returnValue = '';
};

When using React an option is to take control in your Application component, or your most higher order component, in the componentDidMount lifecycle method as @georgim suggested instead componentWillUnmount as I first suggested, and manage there what you want to achieve.

With [react-beforeunload][1] you can track the page changes easily

import { useBeforeunload } from 'react-beforeunload'
const App = () => {
  const [preventMultiSubmit, setPreventMultiSubmit] = useState(false)
}
 const pageRefConf = useBeforeunload((event) => {
    if (preventMultiSubmit) {
      event.preventDefault()
    }
  })
  useEffect(() => {
    window.addEventListener('beforeunload', pageRefConf)
    return () => {
      window.removeEventListener('beforeunload', pageRefConf)
    }
  }, [])

This worked for me. I hope this one will work for you too. [1]: https://www.npmjs.com/package/react-beforeunload

Try this one. This worked for me.

if (window.performance) {
  if (performance.navigation.type == 1) {
    alert( "This page is reloaded" );
  } else {
    alert( "This page is not reloaded");
  }
}