/effector-addon.js Secret
Last active
December 17, 2021 14:19
Creates persistent store in localStorage and prevent leave page when having unsaved data
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import {createStore} from 'effector' | |
import {throttle} from 'lodash' | |
export const createLocalStore = (name, initialState, options = {}) => { | |
const {interval = 250, prevent = false} = options | |
if (!createLocalStore.preventedLeavePage) { | |
window.addEventListener('beforeunload', createLocalStore.preventLeavePage) | |
createLocalStore.preventedLeavePage = true | |
} | |
const load = (key) => { | |
try { | |
const result = localStorage.getItem(key) | |
return result === null ? initialState : JSON.parse(result) | |
} catch (e) { | |
console.error(`Can't load store '${name}' from localStorage.`) | |
} | |
return initialState | |
} | |
const store = createStore(load(name), {name}) | |
store.storageKey = name | |
store.prevent = prevent | |
store.save = (key, value) => { | |
try { | |
localStorage.setItem(key, JSON.stringify(value)) | |
store.unsavedState = undefined | |
} catch (e) { | |
console.error(`Can't save store '${name}' to localStorage.`) | |
} | |
} | |
const throttledSave = throttle(store.save, interval) | |
createLocalStore.stores = createLocalStore.stores || [] | |
createLocalStore.stores.push(store) | |
store.watch(state => { | |
store.unsavedState = state | |
throttledSave(name, state) | |
}) | |
return store | |
} | |
createLocalStore.preventLeavePage = (e) => { | |
e.preventDefault() | |
if (createLocalStore.stores.some(store => store.prevent && store.unsavedState !== undefined)) { | |
e.returnValue = 'There is pending work. Sure you want to leave?' | |
} | |
setTimeout(() => { | |
createLocalStore.stores.forEach(store => { | |
store.unsavedState !== undefined && store.save(store.storageKey, store.unsavedState) | |
}) | |
}) | |
return e.returnValue | |
} |
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