Created
June 12, 2020 23:08
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useFetch
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//@flow | |
import React from 'react'; | |
import useFetch from './Hooks/useFetch'; | |
import marked from 'marked'; | |
import './App.css'; | |
type Data = { | |
posts: Array<{ | |
title: string, | |
slug: string, | |
content: string, | |
name: Array<string> | |
}> | |
}; | |
function App() { | |
const url = `/graphql`; | |
const query = `query { | |
posts { | |
title | |
slug | |
content | |
tags { | |
name | |
} | |
} | |
}`; | |
const [{data, loading, error}] = useFetch<Data>(url, query); | |
if (loading) { | |
return (<h1>Loading...</h1>); | |
} | |
if (error) { | |
return (<h1>Error!</h1>); | |
} | |
const posts = data ? data.posts.map((item) => ( | |
<div key={item.slug}> | |
<h2>{item.title}</h2> | |
<div dangerouslySetInnerHTML={{__html: marked(item.content)}} /> | |
</div> | |
) | |
) : []; | |
return ( | |
<div className="App"> | |
{posts} | |
</div> | |
); | |
} | |
export default App; |
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//@flow | |
import { useCallback, useState, useEffect } from "react"; | |
function useFetch<T>(url: string, query: string): [{ | |
data: ?T, | |
loading: boolean, | |
error: boolean | |
}, () => void] { | |
const [data, setData]: [?T, ((?T => ?T) | ?T) => void] = useState(null); | |
const [loading, setLoading]: [boolean, ((boolean => boolean) | boolean) => void] = useState(false); | |
const [error, setError]: [boolean, ((boolean => boolean) | boolean) => void] = useState(false) | |
const fetchData = useCallback(() => { | |
setLoading(true); | |
fetch(url, { | |
method: 'POST', | |
headers: { | |
'Content-Type': 'application/json', | |
'Accept': 'application/json', | |
}, | |
body: JSON.stringify({query: query}) | |
}).then(r => r.json()) | |
.then((data) => { | |
setData(data.data); | |
setLoading(false); | |
setError(false); | |
}); | |
}, [url, query]); | |
useEffect(() => { | |
fetchData(); | |
}, [url, query, fetchData]); | |
return [{ | |
data: data, | |
loading: loading, | |
error: error | |
}, fetchData]; | |
} | |
export default useFetch; |
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