JAVASCRIPT
`useFetchWithAbort` for Cancellable Data Fetching
Create a `useFetchWithAbort` React hook to perform data fetching with built-in `AbortController` support, enabling request cancellation for improved UX.
import { useState, useEffect, useRef } from 'react';
function useFetchWithAbort(url, options = {}) {
const [data, setData] = useState(null);
const [loading, setLoading] = useState(true);
const [error, setError] = useState(null);
const abortControllerRef = useRef(null);
useEffect(() => {
abortControllerRef.current = new AbortController();
const signal = abortControllerRef.current.signal;
const fetchData = async () => {
setLoading(true);
setError(null);
try {
const response = await fetch(url, { ...options, signal });
if (!response.ok) {
throw new Error(`HTTP error! status: ${response.status}`);
}
const result = await response.json();
setData(result);
} catch (err) {
if (err.name === 'AbortError') {
console.log('Fetch aborted');
} else {
setError(err);
}
} finally {
setLoading(false);
}
};
fetchData();
return () => {
// Abort the fetch request if the component unmounts or dependencies change
if (abortControllerRef.current) {
abortControllerRef.current.abort();
}
};
}, [url, JSON.stringify(options)]); // Dependency on options needs careful handling or deep comparison
// Manual abort function (optional)
const abort = () => {
if (abortControllerRef.current) {
abortControllerRef.current.abort();
console.log('Manually aborted fetch');
}
};
return { data, loading, error, abort };
}
// Example Usage:
/*
function UserProfile({ userId }) {
const { data: user, loading, error, abort } = useFetchWithAbort(
`https://jsonplaceholder.typicode.com/users/${userId}`
);
if (loading) return <div>Loading user...</div>;
if (error) return <div>Error: {error.message} <button onClick={abort}>Cancel Fetch</button></div>;
if (!user) return null;
return (
<div>
<h2>User Profile</h2>
<p>Name: {user.name}</p>
<p>Email: {user.email}</p>
<button onClick={abort}>Abort Current Request</button>
</div>
);
}
*/
How it works: The `useFetchWithAbort` hook facilitates data fetching while allowing requests to be cancelled using `AbortController`. It manages `data`, `loading`, and `error` states. A new `AbortController` is created with each fetch. If the component unmounts or the `url`/`options` dependencies change before the fetch completes, the cleanup function aborts the ongoing request, preventing memory leaks and unnecessary state updates. It also exposes an `abort` function for manual cancellation.