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React Context Demo
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import React, { useState, useEffect, useContext } from 'react' | |
import { UserContext } from './Context' | |
import './App.css' | |
const Login = ({ onLogin, ...props }) => { | |
const [name, setName] = useState('') | |
const [pass, setPass] = useState('') | |
return ( | |
<form onSubmit={() => onLogin({ name, pass })}> | |
<input | |
type="text" | |
onChange={({ target }) => setName(target.value)} | |
/> | |
<input | |
type="password" | |
onChange={({ target }) => setPass(target.value)} | |
/> | |
<button type="submit">Login</button> | |
</form> | |
) | |
} | |
const Home = ({ onLogout }) => { | |
const user = useContext(UserContext) | |
return ( | |
<div> | |
<h1>Logged in</h1> | |
<p>{user.name}</p> | |
<button | |
onClick={() => { | |
localStorage.clear() | |
onLogout() | |
}} | |
> | |
Sign Out | |
</button> | |
</div> | |
) | |
} | |
function App() { | |
const [user, setUser] = useState(JSON.parse(localStorage.getItem('User'))) | |
/* | |
useEffect(() => { | |
const updateUser = setInterval( | |
() => setUser({ name: parseInt(Math.random() * 100) }), | |
1000, | |
) | |
return () => { | |
clearInterval(updateUser) | |
} | |
}, []) */ | |
return user ? ( | |
<UserContext.Provider value={user}> | |
<Home onLogout={() => setUser(null)} /> | |
</UserContext.Provider> | |
) : ( | |
<Login | |
onLogin={u => { | |
localStorage.setItem('User', JSON.stringify(u)) | |
setUser(u) | |
}} | |
/> | |
) | |
} | |
export default App |
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