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EDITING: useLocalStorage.js

/*
 * Copyright (C) 2020 - present Instructure, Inc.
 *
 * This file is part of Canvas.
 *
 * Canvas is free software: you can redistribute it and/or modify it under
 * the terms of the GNU Affero General Public License as published by the Free
 * Software Foundation, version 3 of the License.
 *
 * Canvas is distributed in the hope that it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
 * A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
 * details.
 *
 * You should have received a copy of the GNU Affero General Public License along
 * with this program. If not, see <http://www.gnu.org/licenses/>.
 */

import React from 'react'

function useLocalStorage(key, initialValue) {
  // State to store our value
  // Pass initial state function to useState so logic is only executed once
  const [storedValue, setStoredValue] = React.useState(() => {
    const item = window.localStorage.getItem(key)
    try {
      // Get from local storage by key
      // Parse stored json or if none return initialValue
      return item ? JSON.parse(item) : initialValue
    } catch (error) {
      return item
    }
  })

// 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
      // We'll just swallow it.
    }
  }

return [storedValue, setValue]
}

export default useLocalStorage

CANCEL

Name	Type	Size	Modified	Actions
↩ ..	DIR	—	—
📁 __tests__/	DIR	—	2023-09-24 03:36
📄 useLocalStorage.js	JS	1.8 KB	2023-09-24 03:39	EDIT