This is the official PubNub React framework repository.
PubNub takes care of the infrastructure and APIs needed for the realtime communication layer of your application. Work on your app's logic and let PubNub handle sending and receiving data across the world in less than 100ms.
To use the PubNub React framework, you need:
- React 16.8 or above
- PubNub Javascript SDK.
This library is compatible with the latest versions of the React Native framework. For examples, refer to examples/reactnative.
You will need publish and subscribe keys to authenticate your app. Get your keys from the Admin Portal.
Follow these instructions to set up a simple chat app using PubNub.
Note: These instructions assume you're using JavaScript. If you'd prefer to use TypeScript, follow the instructions in the React framework documentation.
-
Set up your React project.
For a quick single-page app, create-react-app is a good starting point:
npx create-react-app react-sample-chat
-
Add the PubNub JavaScript SDK and React framework packages to your project:
cd react-sample-chat npm install --save pubnub pubnub-react -
Replace the contents of
src/App.jswith the following, replacingmyPublishKeyandmySubscribeKeywith your own keys, andmyUniqueUUIDwith a value of your choice:import React, { useState, useEffect } from 'react'; import PubNub from 'pubnub'; import { PubNubProvider, usePubNub } from 'pubnub-react'; const pubnub = new PubNub({ publishKey: 'myPublishKey', subscribeKey: 'mySubscribeKey', uuid: 'myUniqueUUID' }); function App() { return ( <PubNubProvider client={pubnub}> <Chat /> </PubNubProvider> ); } function Chat() { const pubnub = usePubNub(); const [channels] = useState(['awesome-channel']); const [messages, addMessage] = useState([]); const [message, setMessage] = useState(''); const handleMessage = event => { const message = event.message; if (typeof message === 'string' || message.hasOwnProperty('text')) { const text = message.text || message; addMessage(messages => [...messages, text]); } }; const sendMessage = message => { if (message) { pubnub .publish({ channel: channels[0], message }) .then(() => setMessage('')); } }; useEffect(() => { pubnub.addListener({ message: handleMessage }); pubnub.subscribe({ channels }); }, [pubnub, channels]); return ( <div style={pageStyles}> <div style={chatStyles}> <div style={headerStyles}>React Chat Example</div> <div style={listStyles}> {messages.map((message, index) => { return ( <div key={`message-${index}`} style={messageStyles}> {message} </div> ); })} </div> <div style={footerStyles}> <input type="text" style={inputStyles} placeholder="Type your message" value={message} onKeyPress={e => { if (e.key !== 'Enter') return; sendMessage(message); }} onChange={e => setMessage(e.target.value)} /> <button style={buttonStyles} onClick={e => { e.preventDefault(); sendMessage(message); }} > Send Message </button> </div> </div> </div> ); } const pageStyles = { alignItems: 'center', background: '#282c34', display: 'flex', justifyContent: 'center', minHeight: '100vh', }; const chatStyles = { display: 'flex', flexDirection: 'column', height: '50vh', width: '50%', }; const headerStyles = { background: '#323742', color: 'white', fontSize: '1.4rem', padding: '10px 15px', }; const listStyles = { alignItems: 'flex-start', backgroundColor: 'white', display: 'flex', flexDirection: 'column', flexGrow: 1, overflow: 'auto', padding: '10px', }; const messageStyles = { backgroundColor: '#eee', borderRadius: '5px', color: '#333', fontSize: '1.1rem', margin: '5px', padding: '8px 15px', }; const footerStyles = { display: 'flex', }; const inputStyles = { flexGrow: 1, fontSize: '1.1rem', padding: '10px 15px', }; const buttonStyles = { fontSize: '1.1rem', padding: '10px 15px', }; export default App;
-
In your project, run the following command:
npm start
You should see the following in your browser:
In the code in the previous section, the following adds a message listener in the Chat() function:
useEffect(() => {
pubnub.addListener({ message: handleMessage });
pubnub.subscribe({ channels });
}, [pubnub, channels]);Publishing a message:
const [channels] = useState(['awesome-channel']);
// ...
const sendMessage = message => {
if (message) {
pubnub
.publish({ channel: channels[0], message })
.then(() => setMessage(''));
}
};Subscribing to a channel:
const [channels] = useState(['awesome-channel']);
// ...
useEffect(() => {
pubnub.addListener({ message: handleMessage });
pubnub.subscribe({ channels });
}, [pubnub, channels]);The PubNubProvider makes available a PubNub client instance to a React component tree. You instantiate the provider as follows (note that this example assumes that your publish and subscribe keys are contained in the pubnub.config.json file):
import PubNub from 'pubnub';
import { PubNubProvider } from 'pubnub-react';
const pubNubConfig = require('./pubnub.config.json');
const pubNubClient = new PubNub(pubNubConfig.Demo.keySet);
const App = () => {
return (
<PubNubProvider client={pubNubClient}>
<MyRootComponent />
</PubNubProvider>
);
};
export default App;The PubNubProvider component takes a single prop:
- client is the required pubNubClient instance. This is used by all components that require PubNub functionality.
The PubNub hook lets you interact with PubNub in function components.
Hooks are a new feature added in React 16.8 that allow you to use React features without writing a class. For a general overview of hooks, refer to the React documentation.
import React, { useState, useEffect } from 'react';
import { usePubNub } from '../../src/index';
const PubNubTime = () => {
const client = usePubNub();
const [time, setTime] = useState(null);
const [error, setError] = useState(error);
useEffect(() => {
client
.time()
.then(({ timetoken }) => {
setTime(timetoken);
})
.catch(error => {
setError(error);
});
}, []);
if (error !== null) {
return <div>An error has occured: {error.message}</div>;
}
if (time === null) {
return <div>Loading...</div>;
}
return <div>Current time: {time}</div>;
};
export default PubNubTime;Then, to load PubNubTime on-demand, you could use React.Lazy and Suspense:
import React, { Suspense, lazy } from 'react';
const MyRootComponent = () => {
const DisplayPubNubTime = lazy(() => import('./PubNubTime'));
return (
<Suspense fallback={<div>Loading. . .</div>}>
<DisplayPubNubTime />
</Suspense>
);
};
export default MyRootComponent;The PubNubConsumer allows you to access the client instance you made available with a PubNubProvider.
Note: Be careful, as the children function will be called every time component rerenders. Wrap components using PubNubConsumer using
React.memoto prevent this behaviour.
The PubNubConsumer component takes a single prop:
- client is the required PubNub Client instance. This is used by all components that require PubNub functionality.
Once you've created a PubNubProvider, you can access the client with a PubNubConsumer.
import React from 'react';
import PubNub from 'pubnub';
import { PubNubProvider } from '../PubNubProvider';
import { PubNubConsumer } from '../PubNubConsumer';
import { getPubNubContext } from '../PubNubContext';
const pubNubConfig = require('../config/pubnub.json');
const pubNubClient = new PubNub(pubNubConfig.Demo.keySet);
const App = () => {
return (
<PubNubProvider client={pubNubClient}>
<PubNubConsumer>
{client => 'success!' /* do something now */}
</PubNubConsumer>
</PubNubProvider>
);
};If you need help or have a general question, contact [email protected].
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