mirror of https://github.com/vector-im/riot-web
45 lines
1.5 KiB
TypeScript
45 lines
1.5 KiB
TypeScript
/*
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Copyright 2020 The Matrix.org Foundation C.I.C.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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import { Dispatch, SetStateAction, useCallback, useEffect, useState } from "react";
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const getValue = <T>(key: string, initialValue: T): T => {
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try {
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const item = window.localStorage.getItem(key);
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return item ? JSON.parse(item) : initialValue;
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} catch (error) {
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return initialValue;
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}
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};
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// Hook behaving like useState but persisting the value to localStorage. Returns same as useState
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export const useLocalStorageState = <T>(key: string, initialValue: T): [T, Dispatch<SetStateAction<T>>] => {
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const lsKey = "mx_" + key;
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const [value, setValue] = useState<T>(getValue(lsKey, initialValue));
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useEffect(() => {
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setValue(getValue(lsKey, initialValue));
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}, [lsKey, initialValue]);
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const _setValue: Dispatch<SetStateAction<T>> = useCallback((v: T) => {
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window.localStorage.setItem(lsKey, JSON.stringify(v));
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setValue(v);
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}, [lsKey]);
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return [value, _setValue];
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};
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