reactjs - React - How do you cleanup useEffect() after fetching data and setting a state with that data? - Stack Overflow

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Fri Sep 22 2023 09:48:58 GMT+0000 (Coordinated Universal Time)

import React, { useEffect, useState } from 'react';
import { Redirect, Route } from 'react-router-dom';

import Loading from './Loading';
import Error from './Error';

export default function ProtectedRoute({ component: Component, ...rest }) {
    
    const [ user, setUser ] = useState('');
    const [ fetchingUser, setFetchingUser ] = useState(true);
    const [ noError, setNoError ] = useState(true);

    useEffect(() => {
        const fetchUser = async () => {
            try {
                const response = await fetch('http://localhost:5000/user', {
                    credentials: 'include'
                });

                if (fetchingUser) {
                    const data = await response.json();
                    setUser(data.session.passport.user);
                }

                setFetchingUser(false);

            } catch {
                setNoError(false);
            }
        }

        fetchUser();
    }, [])

    return (

        <div>
            <Route { ...rest } render={ () => { if (!noError) return <Error />} }/>
            <Route { ...rest } render={ () => { if (fetchingUser && noError) return <Loading />} }/>
            <Route { ...rest } render={ () => { if (user && !fetchingUser && noError) return <Component />} }/>
            <Route { ...rest } render={ () => { if (!user && !fetchingUser && noError) return <Redirect to="/login" />} }/>
        </div>
    )
}

COPY

https://stackoverflow.com/questions/62126754/react-how-do-you-cleanup-useeffect-after-fetching-data-and-setting-a-state-w

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Hooks

@Floony

Debounce and Throttle Callbacks with React Hooks | Kyle Shevlin Updater function that spreads current state object and adds a key value pair Using on Input and onBlur to set values and submit them to Redux useReducer Hook with TypeScript Updating array useState Use Immer with useState Hook reactjs - React - How do you cleanup useEffect() after fetching data and setting a state with that data? - Stack Overflow

React

@Floony

Mutating a new reference of a state array in order for React to register a change to said state has been made Nesting and classes in styled components Updater function that spreads current state object and adds a key value pair Using on Input and onBlur to set values and submit them to Redux React props object spread into component useReducer Hook with TypeScript Updating array useState Use Immer with useState Hook reactjs - React - How do you cleanup useEffect() after fetching data and setting a state with that data? - Stack Overflow

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hello(undefined);

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reactjs - React - How do you cleanup useEffect() after fetching data and setting a state with that data? - Stack Overflow

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