A hook that implements fetch in a declarative manner.
- Create a custom hook that takes a
urlandoptions. - Use the
React.useState()hook to initialize theresponseanderrorstate variables. - Use the
React.useEffect()hook to anychronously callfetch()and update the state variables accordingly. - Return an object containting the
responseanderrorstate variables.
const useFetch = (url, options) => {
const [response, setResponse] = React.useState(null);
const [error, setError] = React.useState(null);
React.useEffect(() => {
const fetchData = async () => {
try {
const res = await fetch(url, options);
const json = await res.json();
setResponse(json);
} catch (error) {
setError(error);
}
};
fetchData();
}, []);
return { response, error };
};
//Example
const ImageFetch = (props) => {
const res = useFetch("https://dog.ceo/api/breeds/image/random", {});
if (!res.response) {
return <div>Loading...</div>;
}
const imageUrl = res.response.message;
return (
<div>
<img src={imageUrl} alt="avatar" width={400} height="auto" />
</div>
);
};
ReactDOM.render(<ImageFetch />, document.getElementById("root"));
Live Demo
https://codesandbox.io/s/xenodochial-wind-z2djq?file=/src/index.js
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