我们自己写了个组件，引用组件时想要在组件中写入内容，并且写入的内容可以被组件识别、控制，用过Vue的同学肯定会立刻想到slot插槽，react也支持插槽功能，下面我们用react开发一个支持插槽功能的组件。
父组件在子组件中传入的三个div，这三个div会默认通过props传到子组件中，然后我们在子组件中控制children的渲染即可。
核心代码
// 015 使用插槽
import React from 'react';
import ReactDOM from 'react-dom';
// 父组件
class ParentDom extends React.Component {
constructor(props) {
super(props)
this.state = {
heardData:"头部数据",
footData:"底部数据",
contentData:"内容数据"
}
}
componentDidMount() {
}
render() {
return (
<div>
<h1>015使用插槽</h1>
<ChildDom >
<div data-position="heard" >这是头部</div>
<div data-position="content" >这是内容 丨{this.state.contentData}</div>
<div data-position="foot" >这是底部</div>
</ChildDom>
</div>
)
}
}
// 子组件
class ChildDom extends React.Component {
constructor(props) {
super(props)
}
render() {
let heard,content,foot;
this.props.children.forEach(item =>{
if(item.props['data-position'] == 'heard'){
heard = item
}else if(item.props['data-position'] == 'content'){
content = item
}else if(item.props['data-position'] == 'foot'){
foot = item
}
})
return (
<div >
<p>我是子组件</p>
<div className="heard">
{heard}
</div>
<div className="content">
{content}
</div>
<div className="foot">
{foot}
</div>
</div>
)
}
}
export default function () {
ReactDOM.render(
<ParentDom />,
document.querySelector("#example15")
);
}
展示效果
由于在React组件中写的内容会被挂载到props中，以此来实现类似vue中的插槽功能
这是最外层代码
import React, { Component } from 'react'
import NavBar from './NavBar'
import NavBar2 from './NavBar2'
export default class App extends Component {
render() {
return (
<div>
<NavBar>
<span>aaa</span>
<strong>bbb</strong>
<a href="/#" rel="external nofollow" rel="external nofollow" >ccc</a>
</NavBar>
<NavBar2 leftslot={<span>aaa</span>}
centerslot={<strong>bbb</strong>}
rightslot={<a href="/#" rel="external nofollow" rel="external nofollow" >ccc</a>}/>
</div>
)
}
}
1.用this.props.children[index]
import React, { Component } from 'react'
import './style.css'
export default class NavBar extends Component {
render () {
return (
<div className="nav-bar">
<div className="nav-left">
{this.props.children[0]}
</div>
<div className="nav-center">
{this.props.children[1]}
</div>
<div className="nav-right">
{this.props.children[2]}
</div>
</div>
)
}
}
2.用直接命名方式
import React, { Component } from 'react'
import './style.css'
export default class NavBar extends Component {
render () {
const {leftslot, centerslot,rightslot} = this.props
return (
<div className="nav-bar">
<div className="nav-left">
{leftslot}
</div>
<div className="nav-center">
{centerslot}
</div>
<div className="nav-right">
{rightslot}
</div>
</div>
)
}
}
