您好,登錄后才能下訂單哦!
首先來看下vue的slot的實(shí)現(xiàn)
<base-layout>組件,具名插槽name定義以及默認(rèn)插槽
<div class="container"> <header> <slot name="header"></slot> </header> <main> <slot></slot> </main> <footer> <slot name="footer"></slot> </footer> </div> <template>
提供內(nèi)容渲染的組件
<base-layout> <template v-slot:header> <h2>Here might be a page title</h2> </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>
最終會(huì)渲染出已下架結(jié)構(gòu)
<base-layout> <template v-slot:header> <h2>Here might be a page title</h2> </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>
言歸正傳,怎樣使用react的context實(shí)現(xiàn)vue的這一功能呢
1 首先確認(rèn)下layout組件的結(jié)構(gòu)
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 對(duì)此結(jié)構(gòu)輸出具體內(nèi)容的組件
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"> <h2>這里可能是一個(gè)頁面標(biāo)題</h2> </AddOn> <AddOn> <p>主要內(nèi)容的一個(gè)段落。</p> <p>另一個(gè)段落。</p> </AddOn> <AddOn slot="footer"> <p>這里有一些聯(lián)系信息</p> </AddOn> </AppLayout> ) } }
3 其中AddOn類似于上面vue的template,所以下面來實(shí)現(xiàn)這個(gè)簡(jiǎn)單的只是用來提供slot標(biāo)識(shí)和children內(nèi)容的組件AddOn的實(shí)現(xiàn)
import React from 'react'; import PropTypes from 'prop-types' const AddOn = () => null AddOn.propTypes = { slot: PropTypes.string } AddOn.defaultTypes = { slot: '$$default' } AddOn.displayName = 'AddOn' export default AddOn
4 Slot組件
import React from 'react'; import { SlotContext } from './SlotProvider' import PropTypes from 'prop-types' const Slot = ({ name, children }) => { return ( <SlotContext.Consumer> {(value) => { const addOnRenderer = value.requestAddOnRenderer(name) return (addOnRenderer && addOnRenderer()) || children || null }} </SlotContext.Consumer> ) } Slot.displayName = 'Slot' Slot.propTypes = { name: PropTypes.string } Slot.defaultProps = { name: '$$default' } export default Slot
5 接下來就是對(duì)Slot進(jìn)行解析的HOC SlotProvider組件了
import React, { Component } from 'react'; function getDisplayName(component) { return component.displayName || component.name || 'component' } export const SlotContext = React.createContext({ requestAddOnRenderer: () => { } }) const SlotProviderHoC = (WrappedComponent) => { return class extends Component { static displayName = `SlotProvider(${getDisplayName(WrappedComponent)})` // 用于緩存每個(gè)<AddOn />的內(nèi)容 addOnRenderers = {} requestAddOnRenderer = (name) => { if (!this.addOnRenderers[name]) { return undefined } return () => ( this.addOnRenderers[name] ) } render() { const { children, ...restProps } = this.props if (children) { // 以k-v的方式緩存<AddOn />的內(nèi)容 const arr = React.Children.toArray(children) const nameChecked = [] this.addOnRenderers = {} arr.forEach(item => { const itemType = item.type console.log('itemType',itemType) if (item.type.displayName === 'AddOn') { const slotName = item.props.slot || '$$default' // 確保內(nèi)容唯一性 if (nameChecked.findIndex(item => item === slotName) !== -1) { throw new Error(`Slot(${slotName}) has been occupied`) } this.addOnRenderers[slotName] = item.props.children nameChecked.push(slotName) } }) } return ( <SlotContext.Provider value={{ requestAddOnRenderer: this.requestAddOnRenderer }}> <WrappedComponent {...restProps} /> </SlotContext.Provider > ) } } } export default SlotProviderHoC
6 最終渲染結(jié)果
總結(jié)
以上所述是小編給大家介紹的使用react context 實(shí)現(xiàn)vue插槽slot功能,希望對(duì)大家有所幫助,如果大家有任何疑問請(qǐng)給我留言,小編會(huì)及時(shí)回復(fù)大家的。在此也非常感謝大家對(duì)億速云網(wǎng)站的支持!
如果你覺得本文對(duì)你有幫助,歡迎轉(zhuǎn)載,煩請(qǐng)注明出處,謝謝!
免責(zé)聲明:本站發(fā)布的內(nèi)容(圖片、視頻和文字)以原創(chuàng)、轉(zhuǎn)載和分享為主,文章觀點(diǎn)不代表本網(wǎng)站立場(chǎng),如果涉及侵權(quán)請(qǐng)聯(lián)系站長(zhǎng)郵箱:is@yisu.com進(jìn)行舉報(bào),并提供相關(guān)證據(jù),一經(jīng)查實(shí),將立刻刪除涉嫌侵權(quán)內(nèi)容。