beautiful-react-hooks/esm/useOnlineState.js

A collection of beautiful (and hopefully useful) React hooks to speed-up your components and hooks development

import { useState } from 'react';
import useGlobalEvent from './useGlobalEvent';
import warnOnce from './shared/warnOnce';
/**
 * Uses the [Navigator online API](https://developer.mozilla.org/en-US/docs/Web/API/NavigatorOnLine/onLine) to define
 * whether the browser is connected or not.
 */
const useOnlineState = () => {
    /**
     * If the browser doesn't support the `navigator.onLine` state, the hook will always return true
     * assuming the app is already online.
     */
    const isSupported = typeof window !== 'undefined' && 'ononline' in window;
    const [isOnline, setIsOnline] = useState(isSupported ? navigator.onLine : true);
    const whenOnline = useGlobalEvent('online', { capture: true });
    const whenOffline = useGlobalEvent('offline', { capture: true });
    if (!isSupported) {
        warnOnce('The current device does not support the \'online/offline\' events, you should avoid using useOnlineState');
        return isOnline;
    }
    whenOnline(() => {
        setIsOnline(true);
    });
    whenOffline(() => {
        setIsOnline(false);
    });
    return isOnline;
};
export default useOnlineState;