使用react context 实现vue插槽slot功能

首先来看下vue的slot的实现

<base-layout>组件，具名插槽name定义以及默认插槽

<div class="container"> <header>  <slot name="header"></slot> </header> <main>  <slot></slot> </main> <footer>  <slot name="footer"></slot> </footer></div><template>

提供内容渲染的组件

<base-layout> <template v-slot:header>  <h1>Here might be a page title</h1> </template> <p>A paragraph for the main content.</p> <p>And another one.</p> <template v-slot:footer>  <p>Here's some contact info</p> </template></base-layout>

最终会渲染出已下架结构

<base-layout> <template v-slot:header>  <h1>Here might be a page title</h1> </template> <p>A paragraph for the main content.</p> <p>And another one.</p> <template v-slot:footer>  <p>Here's some contact info</p> </template></base-layout>

言归正传，怎样使用react的context实现vue的这一功能呢

1 首先确认下layout组件的结构

import React, { Component } from 'react';import SlotProvider from './SlotProvider'import Slot from './Slot'class AppLayout extends Component { static displayName = 'AppLayout' render () {  return (   <div className="container">    <header>     <Slot name="header"></Slot>    </header>    <main>     <Slot></Slot>    </main>    <footer>     <Slot name="footer"></Slot>    </footer>   </div>  ) }}export default SlotProvider(AppLayout)

2 对此结构输出具体内容的组件

import React, { Component } from 'react';import AppLayout from './AppLayout'import AddOn from './AddOn'export default class App extends Component {  render() {    return (      <AppLayout>        <AddOn slot="header">          <h1>这里可能是一个页面标题</h1>        </AddOn>        <AddOn>          <p>主要内容的一个段落。</p>          <p>另一个段落。</p>        </AddOn>        <AddOn slot="footer">          <p>这里有一些联系信息</p>        </AddOn>      </AppLayout>    )  }}

3 其中AddOn类似于上面vue的template，所以下面来实现这个简单的只是用来提供slot标识和children内容的组件AddOn的实现

import React from 'react';import PropTypes from 'prop-types'const AddOn = () => nullAddOn.propTypes = { slot: PropTypes.string }AddOn.defaultTypes = { slot: '$$default' }AddOn.displayName = 'AddOn'export default AddOn

4 Slot组件

import React from 'react';import { SlotContext } from './SlotProvider'import PropTypes from 'prop-types'const Slot = ({ name, children }) => { return (  <SlotContext.Consumer>   {(value) => {    const addOnRenderer = value.requestAddOnRenderer(name)     return (addOnRenderer && addOnRenderer()) || children || null   }}  </SlotContext.Consumer> )}Slot.displayName = 'Slot'Slot.propTypes = { name: PropTypes.string }Slot.defaultProps = { name: '$$default' }export default Slot