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December 9, 2022 21:57
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Save gragland/2970ae543df237a07be1dbbf810f23fe to your computer and use it in GitHub Desktop.
React Hook recipe from https://usehooks.com. Demo: https://codesandbox.io/s/qxkr4mplv6
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import { useState } from 'react'; | |
// Usage | |
function App() { | |
// Similar to useState but first arg is key to the value in local storage. | |
const [name, setName] = useLocalStorage('name', 'Bob'); | |
return ( | |
<div> | |
<input | |
type="text" | |
placeholder="Enter your name" | |
value={name} | |
onChange={e => setName(e.target.value)} | |
/> | |
</div> | |
); | |
} | |
// Hook | |
function useLocalStorage(key, initialValue) { | |
// State to store our value | |
// Pass initial state function to useState so logic is only executed once | |
const [storedValue, setStoredValue] = 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]; | |
} |
Could we add a custom serialization/deserialization logic?
function useLocalStorage(key, initialValue, serialize = JSON.stringify, deserialize = JSON.parse) {
And use those functions instead of calling JSON.stringify
/JSON.parse
.
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You can sync the state of localStorage between all tabs that application is opened.
My solution was: