Avoiding hydration mismatch when using React hooks
function useMediaQuery(mediaQueryString) {
/*
* Initialize 'matches' with 'false' on the server, and with the correct
* value in the browser.
*/
const [matches, setMatches] = useState(
typeof window === 'undefined'
? false
: !!window.matchMedia(mediaQueryString).matches
)
/*
* Continuously monitor the media query and update 'matches' accordingly.
*/
useEffect(() => {
const mediaQueryList = window.matchMedia(mediaQueryString)
const listener = () => setMatches(!!mediaQueryList.matches)
mediaQueryList.addListener(listener)
return () => mediaQueryList.removeListener(listener)
}, [mediaQueryString])
return matches
}
function useBetterMediaQuery(mediaQueryString) {
const [matches, setMatches] = useState(null)
useEffect(() => {
const mediaQueryList = window.matchMedia(mediaQueryString)
const listener = () => setMatches(!!mediaQueryList.matches)
mediaQueryList.addListener(listener)
// Call the listener() function immediately to set the local
// state as soon as possible.
listener()
return () => {
mediaQueryList.removeListener(listener)
}
}, [mediaQueryString])
return matches
}
import { useState, useEffect, useCallback, useRef, component, jsx, render } from "@j-f1/react"
One platform to build and deploy the best data apps
Experiment and prototype by building visualizations in live JavaScript notebooks. Collaborate with your team and decide which concepts to build out.
Use Observable Framework to build data apps locally. Use data loaders to build in any language or library, including Python, SQL, and R.
Seamlessly deploy to Observable. Test before you ship, use automatic deploy-on-commit, and ensure your projects are always up-to-date.