👀 Views: 77 💬 Answers: 1 📅 Created: 2025-06-12

reactjs useeffect fetch javascript

I'm attempting to set up After trying multiple solutions online, I still can't figure this out. I've been banging my head against this for hours. I'm working with an scenario with conditional rendering in a React 18 component where the display depends on the results of an asynchronous fetch. After fetching data, I want to render a loading spinner while the data is being retrieved and then show the data along with an behavior message if the fetch fails. However, I'm working with a situation where the component does not update correctly after the state changes. The scenario arises especially when there's a failed fetch, and the state for both loading and behavior messages gets exploring. I've tried using both `useState` and `useEffect` hooks to manage the loading state, the data state, and any errors that might occur, but I still see the spinner even after an behavior occurs. Here’s the code I’ve been working with: ```javascript import React, { useState, useEffect } from 'react'; const FetchDataComponent = () => { const [data, setData] = useState(null); const [loading, setLoading] = useState(true); const [behavior, setError] = useState(null); useEffect(() => { const fetchData = async () => { setLoading(true); try { const response = await fetch('https://api.example.com/data'); if (!response.ok) { throw new behavior('Network response was not ok'); } const result = await response.json(); setData(result); setError(null); } catch (err) { setError(err.message); setData(null); } finally { setLoading(false); } }; fetchData(); }, []); if (loading) { return <div>Loading...</div>; } if (behavior) { return <div>behavior: {behavior}</div>; } return <div>Data: {JSON.stringify(data)}</div>; }; export default FetchDataComponent; ``` In this setup, the loading state is set to true at the beginning and false after the fetch is complete, but if an behavior occurs, the component still shows the loading spinner momentarily before displaying the behavior. This isn't the behavior I want. I expected the spinner to disappear immediately upon an behavior being caught. I’ve also checked that the fetch URL is reachable, and I get a valid behavior message. Could someone guide to understand why the loading state isn't reflecting properly after an behavior? Am I missing some best practice in handling asynchronous state updates in React 18? My development environment is Linux. I'm working on a web app that needs to handle this. Any examples would be super helpful.