詳解react-refetch的使用小例子

2019-11-19 12:08:28

字體：大中小

來源：轉載

供稿：網友

使用react-refetch來簡化api獲取數據的代碼

const List = ({data: gists}) => { return (  <ul>   {gists.map(gist => (    <li key={gist.id}>{gist.description}</li>   ))}  </ul> )}const withData = url => Part => { return class extends Component {  state = {data: []}  componentDidMount() {   fetch(url)    .then(response => response.json ? response.json() : response)    .then(data => this.setState({data}))  }  render() {   return <Part {...this.state} {...this.props} />  } }}const ListWithGists = withData('https://api.github.com/users/gaearon/gists')(List)

上面的代碼，我們將api獲取數據的邏輯用高階組件抽離出來，下面我們再用react-refetch來簡化上面的異步代碼

import { connect as refetchConnect } from 'react-refetch'const List = ({gists}) => { if (gists.pending) {  return <div>loading...</div> } else if (gists.rejected) {  return <div>{gists.reason}</div> } else if (gists.fulfilled) {  return (   gists.fulfilled && <ul>    {gists.value.map(gist => (     <li key={gist.id}>{gist.description}</li>    ))}   </ul>  ) }}const ListWithGists = refetchConnect(() => ({gists: `https://api.github.com/users/gaearon/gists`}))(List)

瞬間清爽多了，順便利用react-refetch提供的屬性，順便把loading邏輯也添加了

分離列表和項目的職責

很明顯，List組件是一個渲染列表的組件，他的職責就是渲染列表，但是我們在這里也處理了單個Item的邏輯，我們可以將其進行職責分離,List只做列表染，而Gist也只渲染自身

const Gist = ({description}) => ( <li>  {description} </li>)const List = ({gists}) => { if (gists.pending) {  return <div>loading...</div> } else if (gists.rejected) {  return <div>{gists.reason}</div> } else if (gists.fulfilled) {  return (   gists.fulfilled && <ul>    {gists.value.map(gist => <Gist key={gist.id} {...gist} />)}   </ul>  ) }}

使用react-refetch來給Gist添加功能

react-refetch的connect方法接收一個函數作為參數，這個函數返回一個對象，如果結果對象的值是一個字符串，那么獲取prop后，會對這個字符串發起請求，但是如果值是一個函數，那么不會立即執行，而是會傳遞給組件，以便后續使用

值為字符串

const connectWithStar = refetchConnect(() => ({gists: `https://api.github.com/users/gaearon/gists`}))

值為函數

const connectWithStar = refetchConnect(({id}) => ({ star: () => ({  starResponse: {   url: `https://api.github.com/gists/${id}/star?${token}`,   method: 'PUT'  } })}))const Gist = ({description, star}) => ( <li>  {description}  <button onClick={star}>+1</button> </li>)

加工Gist組件，star函數會被傳遞給Gist的prop，然后就可以在Gist里面使用了