How to pass values to sibling components in react-JS Tutorial-php.cn

How to pass values to sibling components in react

藏色散人

Release： 2020-12-21 10:01:38

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The method of passing values from sibling components in react: first open the corresponding front-end file; then set a common parent component to pass values; then create a child component and pass the data to the parent component; finally make the parent The component receives the value and passes it to another sub-component.

How to pass values to sibling components in react

The operating environment of this tutorial: Windows 7 system, react17.0.1 version, this method is suitable for all brands of computers.

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How to pass values to sibling components in react

In React, the sibling components themselves have no relationship. If you want to have a relationship, you can only pass values through the common parent component. A child component passes data to the parent component, and the parent component receives the value and then passes it to another child.

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" />
<title>Hello React!</title>
<script src="https://cdn.staticfile.org/react/16.4.0/umd/react.development.js"></script>
<script src="https://cdn.staticfile.org/react-dom/16.4.0/umd/react-dom.development.js"></script>
<script src="https://cdn.staticfile.org/babel-standalone/6.26.0/babel.min.js"></script>
</head>
<body>
<div id="box"></div>
<script type="text/babel">
//子组件向父组件传值，父组件接收再传递给另一个子组件
class Childone extends React.Component{
constructor(props){
super(props);
this.state={color:"lightblue"}
}
handlecolor(){
this.props.fn("red");             
//在触发方法中通过props添加一个新的fn方法，并且将颜色参数red传入父组件
this.setState({color:"red"});
}
render(){
return(
<div>
<h4 style={{color:this.state.color}}>我是第一个子组件</h4>
<button onClick={this.handlecolor.bind(this)}>改变第二个子组件颜色</button>       
//给第一个子组件绑定一个方法，点击就触发，注意要绑定this
</div>
)
}
}
class Childtwo extends React.Component{
constructor(props){
super(props);
}
render(props){
return(
<h4 style={{color:this.props.co}}>我是第二个子组件</h4>               
//利用prop属性从外界即父组件获取参数，不能用state，state是内部使用的
)
}
}
class Parents extends React.Component{
constructor(props){
super(props);
this.state={childtwocolor:"lightblue"};
}
change(color) {
this.setState({childtwocolor: color});
}
render(props) {
return (
<div>
<Childone fn={(color)=>{this.change(color)}}></Childone>         
//第一个子组件的方法fn，将参数red传入函数change中，更新父组件本身的颜色childtwocolor
<Childtwo co={this.state.childtwocolor}></Childtwo>                   
//第二个子组件获取父组件本身的颜色，当父组件颜色更新时，它也会随之更新
</div>
)
}
}
ReactDOM.render(
<Parents />,
document.getElementById(&#39;box&#39;)
);
</script>
</body>
</html>

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