Created
November 4, 2021 13:49
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React local Storage hook
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import React from "react"; | |
const useLocalStorage=(key, initialValue,clearCache=false)=> { | |
// State to store our value | |
// Pass initial state function to useState so logic is only executed once | |
if(clearCache){window.localStorage.removeItem(key)} | |
const [storedValue, setStoredValue] = React.useState(() => { | |
try { | |
// Get from local storage by key | |
const item = window.localStorage.getItem(key); | |
// Parse stored json or if none return initialValue | |
return item ? JSON.parse(item) : initialValue; | |
} catch (error) { | |
// If error also return initialValue | |
console.log(error); | |
return initialValue; | |
} | |
}); | |
// Return a wrapped version of useState's setter function that ... | |
// ... persists the new value to localStorage. | |
const setValue = (value) => { | |
try { | |
// Allow value to be a function so we have same API as useState | |
const valueToStore = | |
value instanceof Function ? value(storedValue) : value; | |
// Save state | |
setStoredValue(valueToStore); | |
// Save to local storage | |
window.localStorage.setItem(key, JSON.stringify(valueToStore)); | |
} catch (error) { | |
// A more advanced implementation would handle the error case | |
console.log(error); | |
} | |
}; | |
return [storedValue, setValue]; | |
} | |
export { | |
useLocalStorage, | |
} |
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