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App.js
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App.js
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import React, { useCallback, useEffect, useState } from 'react';
import logo from './logo.svg';
import './App.css';
import NavBar from "./components/NavBar"
function App() {
const [message, setMessage] = useState(null);
const [isFetching, setIsFetching] = useState(false);
const [url, setUrl] = useState('/api');
const fetchData = useCallback(() => {
fetch(url)
.then(response => {
if (!response.ok) {
throw new Error(`status ${response.status}`);
}
return response.json();
})
.then(json => {
setMessage(json.message);
setIsFetching(false);
}).catch(e => {
setMessage(`API call failed: ${e}`);
setIsFetching(false);
})
}, [url]);
useEffect(() => {
setIsFetching(true);
fetchData();
}, [fetchData]);
return (
<div className="App" >
<NavBar />
<div>
<img src={logo} className="App-logo" alt="logo" />
<p>{'« '}<strong>
{isFetching
? 'Fetching message from API'
: message}
</strong>{' »'}</p>
</div>
</div>
);
}
export default App;