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詳解react-refetch的使用小例子

更新時間：2019年02月15日 10:33:03 作者：碼碼碼畜

這篇文章主要介紹了詳解react-refetch的使用小例子，小編覺得挺不錯的，現(xiàn)在分享給大家，也給大家做個參考。一起跟隨小編過來看看吧

使用react-refetch來簡化api獲取數(shù)據(jù)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(shù)據(jù)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(shù)作為參數(shù)，這個函數(shù)返回一個對象，如果結(jié)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(fā)起請求，但是如果值是一個函數(shù)，那么不會立即執(zhí)行，而是會傳遞給組件，以便后續(xù)使用

值為字符串

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

值為函數(shù)

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(shù)會被傳遞給Gist的prop，然后就可以在Gist里面使用了