React获取DOM节点
原生方法
利用原生方法中抓取DOM节点的方法,例如getElementById
,querySelector
等
import React from 'react'
class RefDemo extends React.Component{
handleClick(){
document.getElementsByTagName('p')[0].style.color = 'red'
}
render(){
return(
<div>
<p>哈哈哈</p>
<input type='button' value='点击' onClick={this.handleClick.bind(this)} />
</div>
)
}
}
export default RefDemo
Jquery方法
安装jquery
包,使用jq选择器抓取DOM节点,可以用jq方法进行操作
import React from 'react'
import $ from 'jquery'
class RefDemo extends React.Component{
handleClick(){
$('p').toggle('slow')
//有就隐藏,没有就显示
}
render(){
return(
<div>
<p>哈哈哈</p>
<input type='button' value='点击' onClick={this.handleClick.bind(this)} />
</div>
)
}
}
export default RefDemo
通过React的ref
来获取DOM节点
import React from 'react'
class Ref extends React.Component{
constructor(){
super()
this.state = {
title:''
}
}
handleClick(){
this.setState({
title:this.value.value
})
}
render(){
return(
<div>
<p>123{this.state.title}</p>
<input ref={ value => this.value = value } onChange={this.handleClick.bind(this)} />
<input type='button' value='点击' onClick={this.handleClick.bind(this)} />
</div>
)
}
}
export default Ref
不仅可以获取DOM节点,还可以获取子组件的节点
import React from 'react'
class Test extends React.Component{
constructor(){
super()
this.state = {
show:true
}
}
handleShow(){
this.setState({
show:!this.state.show
})
}
render(){
return(
<div>
<p style={{display:this.state.show ? 'block':'none'}}>杀人诛心</p>
<input type='button' value='点击' onClick={this.handleShow.bind(this)} />
</div>
)
}
}
class Ref extends React.Component{
handleClick(){
this.test.handleShow()
}
render(){
return(
<div>
<Test ref={test => this.test = test} onClick={this.handleClick.bind(this)}/>
<input type='button' value='点' onClick={this.handleClick.bind(this)} />
</div>
)
}
}
export default Ref