How to pass state between all child components after user authorization?

user_5786165 0
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The server is returning user data. In particular, I am interested in his rights. With these rights, I will render the components. I am thinking of passing this data to components and doing some checks. All routes are in the index.js

import {Notfound404} from './components/404/404NotFound'
import {UserContext} from './UserContext'

const Router = () => {

    const [user, setUser] = useState(null)

    return (
        <React.StrictMode>
            <UserContext.Provider value={{user, setUser}}>
                <CookiesProvider>
                    <BrowserRouter>
                        <Switch>
                            <Route exact path={'/'} component={Auth}/>
                            <Route exact path={'/settings'} component={Settings}/>
                            <Route exact path={'/event-logs'} component={EventLog}/>
                            <Route component={Notfound404} status={404}/>
                        </Switch>
                    </BrowserRouter>
                </CookiesProvider>
            </UserContext.Provider>
        </React.StrictMode>
    )
}

setting user data in Auth.js

import {UserContext} from '../../UserContext'

export const Auth = () => {

    const {user, setUser} = useContext(UserContext)

    const [username, setUsername] = useState('')
    const [password, setPassword] = useState('')
    const [token, setToken] = useCookies(['qr-token'])

    useEffect(() => {
        if (token['qr-token']) window.location.href = '/settings'
    }, [token])

    const credentials = {
        username: username,
        password: password
    }

    const sendCredentials = () => {
        axios.post(`http://127.0.0.1:8000/api/v1/auth/`, credentials, {
            headers: {
                'Content-type': 'application/json',
            }
        })
            .then(resp => {
                setToken('qr-token', resp.data.token);
                setUser(resp.data)
            })
            .catch(error => console.log(error.response))
    }

    return !token['qr-token'] &&
        <div className={styles.authContainer}>
            <label htmlFor={'username'}>Username</label>
            <input id={'username'} type={'text'} placeholder={'username'}
                   onChange={evt => setUsername(evt.target.value)}
            />
            <label htmlFor={'password'}>Password</label>
            <input id={'password'} type={'password'} onChange={evt => 
                setPassword(evt.target.value)}/>
            <button onClick={sendCredentials}>Sign In</button>
        </div>
    )
}

In the index.js I am getting user data after authorization. But in settings.js use data is null

export const Settings = () => {

    const {user, setUser} = useContext(UserContext)
    console.log(user) # null
....
}

Probably I am doing something wrong and I am asking for your help. Thanks.

react-context reactjs
3 Answers

I think a refresh is happening while redirecting to the setting page. That reload cause the context value to get cleared (simply, because the value of the context is coming from a state and that state gets lost as a result of refresh). To fix this, you can store the auth data data in localStorage and assign the context value to it whenever it gets null.

user_99499060

As Saba indicated, the issue is about refreshing the page which clears the context. This is done by these lines:

useEffect(() => {
    if (token['qr-token']) window.location.href = '/settings'
}, [token])

Don't use the usual redirect methods in Single Page Applications. Instead, use

const history = useHistory();
useEffect(() => {
    if (token['qr-token'])
        history.push('/settings');
}, [token])

This won't cause a reload of the page and therefore keeps your context alive.

user_43598630

useContext() provides a dispatch function that has been passed down from the Store component. The dispatch function accepts two arguments, a type of action, and a payload for updating the global state. The useContext() function will then return an updated global state.

const { state, dispatch } = useContext(MyContext);

In your code setUser must be triggered with the parameter contains action type and payload.

For example.

setUser({
    type: "SET_USER",
    payload: resp.data
  })
user_142687800
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