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November 17, 2018 23:03
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ReactJS Custom hook for syncing state between tabs and persist to localStorage.
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import { useEffect, useState } from "react"; | |
export const useStorageArea = storageArea => (key, initialValue) => { | |
const [item, setValue] = useState( | |
() => JSON.parse(storageArea.getItem(key)) || initialValue | |
); | |
const updateFromEvent = e => { | |
if (e.key === key && e.storageArea === storageArea) { | |
setValue(JSON.parse(e.newValue)); | |
} | |
}; | |
useEffect(() => { | |
storageArea.setItem(key, JSON.stringify(item)); | |
}); | |
useEffect(() => { | |
window.addEventListener("storage", updateFromEvent); | |
return () => { | |
window.removeEventListener("storage", updateFromEvent); | |
}; | |
}); | |
return [item, setValue]; | |
}; | |
export const useStorageState = useStorageArea(window.localStorage); | |
export const useSessionState = useStorageArea(window.sessionStorage); |
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I don't recommend anyone using this. I made it purely to test things out