使用react-refetch来简化api获取数据的代码
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)
上面的代码，我们将api获取数据的逻辑用高阶组件抽离出来，下面我们再用react-refetch来简化上面的异步代码
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)
瞬间清爽多了，顺便利用react-refetch提供的属性，顺便把loading逻辑也添加了
分离列表和项目的职责
很明显，List组件是一个渲染列表的组件，他的职责就是渲染列表，但是我们在这里也处理了单个Item的逻辑，我们可以将其进行职责分离,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来给Gist添加功能
react-refetch的connect方法接收一个函数作为参数，这个函数返回一个对象，如果结果对象的值是一个字符串，那么获取prop后，会对这个字符串发起请求，但是如果值是一个函数，那么不会立即执行，而是会传递给组件，以便后续使用
值为字符串
const connectWithStar = refetchConnect(() => ({gists: `https://api.github.com/users/gaearon/gists`}))
值为函数
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组件，star函数会被传递给Gist的prop，然后就可以在Gist里面使用了
connectWithStar(Gist)