shivamb/react-detect-offline

Offline and Online components for React

Offline and Online components for React

Components that track offline and online state. Render certain content only when online (or only when offline).

import { Offline, Online } from "react-detect-offline";

const App = () => (
  <div>
    <Online>Only shown when you're online</Online>
    <Offline>Only shown offline (surprise!)</Offline>
  </div>
);

Demo

Check out chris.bolin.co/offline for a simple example (source code).

Components

Simple

<Online/> and <Offline/> - Components that render their children only when the browser is online/offline.

<Offline>You're offline right now. Check your connection.</Offline>

Advanced

<Detector render={({ online }) => ...}/> - Component that calls its render prop every time the connection state changes. The render prop is supplied with an object with an online boolean value. Recommended for more complex cases, e.g. when styles need to be changed with connection status.

<Detector
  render={({ online }) => (
    <div className={online ? "normal" : "warning"}>
      You are currently {online ? "online" : "offline"}
    </div>
  )}
/>

Props

<Online/>, <Offline/>, and <Detector/> accept the following props:

Prop	Type	Description	Default
polling	Obj or Bool	Config for polling fallback [1]	[see below]
polling.enabled	Boolean	Force polling on or off	Depends on the browser [1]
polling.url	String	URL to pool for connection status	"https://ipv4.icanhazip.com"
polling.interval	Number	How often (in ms) to poll	5000
polling.timeout	Number	How long (in ms) before timeout	5000
onChange	Function	Called when connection changes	none
children [2]	Element(s)	Children not Detector	none
render [3]	Func	Render function Detector only	none

[1] Polling is only used as a fallback for browsers that don't support the "online" event. Currently these are Chrome on Windows, Firefox on Windows, and Chrome on Linux.

[2] <Online/> and <Offline/> only. <Detector/> will not render children.

[3] <Detector/> only

Browser Support

The web spec we rely on is supported by IE 9+, Chrome 14+, Firefox 41+, and Safari 5+ - that's 94% of worldwide (98% of US) browser traffic. A polling fallback is used for browsers that don't implement the spec in a useful way (see note [1] in the above Props section).

Contributing

PRs are welcome!

• Test: yarn test
• Build: yarn build. Make sure you commit the build file (dist/index.js)