We read every piece of feedback, and take your input very seriously.
To see all available qualifiers, see our documentation.
Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.
By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.
Already on GitHub? Sign in to your account
import React, { Fragment, useState, useEffect } from 'react'; import axios from 'axios'; const useDataApi = (initialUrl, initialData) => { const [data, setData] = useState(initialData); const [url, setUrl] = useState(initialUrl); const [isLoading, setIsLoading] = useState(false); const [isError, setIsError] = useState(false); useEffect(() => { const fetchData = async () => { setIsError(false); setIsLoading(true); try { const result = await axios(url); setData(result.data); } catch (error) { setIsError(true); } setIsLoading(false); }; fetchData(); }, [url]); const doFetch = url => { setUrl(url); }; return { data, isLoading, isError, doFetch }; }; function App() { const [query, setQuery] = useState('redux'); const { data, isLoading, isError, doFetch } = useDataApi( 'http://hn.algolia.com/api/v1/search?query=redux', { hits: [] }, ); return ( <Fragment> <form onSubmit={event => { doFetch( `http://hn.algolia.com/api/v1/search?query=${query}`, ); event.preventDefault(); }} > <input type="text" value={query} onChange={event => setQuery(event.target.value)} /> <button type="submit">Search</button> </form> {isError && <div>Something went wrong ...</div>} {isLoading ? ( <div>Loading ...</div> ) : ( <ul> {data.hits.map(item => ( <li key={item.objectID}> <a href={item.url}>{item.title}</a> </li> ))} </ul> )} </Fragment> ); } export default App;
用reducer简化状态的改变
const useDataApi = (initialUrl, initialData) => { const [url, setUrl] = useState(initialUrl); const [state, dispatch] = useReducer(dataFetchReducer, { isLoading: false, isError: false, data: initialData, }); useEffect(() => { let didCancel = false; const fetchData = async () => { dispatch({ type: 'FETCH_INIT' }); try { const result = await axios(url); if (!didCancel) { dispatch({ type: 'FETCH_SUCCESS', payload: result.data }); } } catch (error) { if (!didCancel) { dispatch({ type: 'FETCH_FAILURE' }); } } }; fetchData(); return () => { didCancel = true; }; }, [url]); const doFetch = url => { setUrl(url); }; return { ...state, doFetch }; }; const dataFetchReducer = (state, action) => { switch (action.type) { case 'FETCH_INIT': return { ...state, isLoading: true, isError: false }; case 'FETCH_SUCCESS': return { ...state, isLoading: false, isError: false, data: action.payload, }; case 'FETCH_FAILURE': return { ...state, isLoading: false, isError: true, }; default: throw new Error(); } };
The text was updated successfully, but these errors were encountered:
No branches or pull requests
用reducer简化状态的改变
The text was updated successfully, but these errors were encountered: