README.md

react-liff

A react context provider for LIFF (LINE Front-end Framework)

Requirements

• React v18.0 or later
  • React Native is not supported.
• LIFF SDK version >=2.19.1

Getting started

When you use NPM version of LIFF SDK (Recommended)

1. Create your React application development environment.

   • e.g. npx create-react-app app-name

2. Add react-liff to your app dependencies.

   npm i --save @line/liff react-liff
   # or
   yarn add @line/liff react-liff

3. Import react-liff to your app and use it!

   • An example of src/App.js

     import React, { useEffect, useState } from 'react';
     import { useLiff } from 'react-liff';
     
     import './App.css';
     
     const App = () => {
       const [displayName, setDisplayName] = useState('');
       const { error, isLoggedIn, isReady, liff } = useLiff();
     
       useEffect(() => {
         if (!isLoggedIn) return;
     
         (async () => {
           const profile = await liff.getProfile();
           setDisplayName(profile.displayName);
         })();
       }, [liff, isLoggedIn]);
     
       const showDisplayName = () => {
         if (error) return <p>Something is wrong.</p>;
         if (!isReady) return <p>Loading...</p>;
     
         if (!isLoggedIn) {
           return (
             <button className="App-button" onClick={liff.login}>
               Login
             </button>
           );
         }
         return (
           <>
             <p>Welcome to the react-liff demo app, {displayName}!</p>
             <button className="App-button" onClick={liff.logout}>
               Logout
             </button>
           </>
         );
       };
     
       return (
         <div className="App">
           <header className="App-header">{showDisplayName()}</header>
         </div>
       );
     };
     
     export default App;

   • An example of src/index.js

     import React from 'react';
     import ReactDOM from 'react-dom';
     import { LiffProvider } from 'react-liff';
     
     import './index.css';
     import App from './App';
     
     const liffId = process.env.REACT_APP_LINE_LIFF_ID;
     
     ReactDOM.render(
       <React.StrictMode>
         <LiffProvider liffId={liffId}>
           <App />
         </LiffProvider>
       </React.StrictMode>,
       document.getElementById('root')
     );

When you use CDN version of LIFF SDK

1. Create your React application development environment.
   • e.g. npx create-react-app app-name
2. Add react-liff to your app dependencies.

   npm i --save react-liff
   # or
   yarn add react-liff

3. Update index.html to load LIFF SDK
   • https://developers.line.biz/en/docs/liff/developing-liff-apps/#developing-a-liff-app

     +    <script defer charset="utf-8" src="https://static.line-scdn.net/liff/edge/2/sdk.js"></script>

4. Import react-liff to your app and use it!

API

LiffProvider props

• liffId: string, required
  • The ID of your LIFF application.
• withLoginOnExternalBrowser: boolean, optional
  • See the API reference of liff.init(). https://developers.line.biz/en/reference/liff/#initialize-liff-app-arguments
• plugins: Array<LiffPlugin | [LiffPlugin, LiffPluginOption]>, optional
  • List of LIFF plugin instances.
  • If you need to pass option to plugin, you can use the list of tuple [pluginInstance, pluginOption].
• callback: (liff: Liff) => Promise<void>, optional
  • Callback function that fires after liff.init() has been succeeded.

LiffConsumer / useLiff return values

• error: unknown (is LiffError | undefined in many cases)
  • Returns an error if liff.init() was failed.
• isLoggedIn: boolean
  • Returns whether the user is logged in.
• isReady: boolean
  • Returns true after liff.init() has successfully completed. Otherwise, returns false.
• liff: Liff
  • Returns liff object.

CHANGELOG

CHANGELOG

LICENSE

MIT