问题描述
我有一个显示元素onClick的简单组件:
class MyComponent扩展React.Component {
state = {
isVisible:false
}
render(){
const {isVisble} = this.state
return(
< div>
{isVisble?
< div onClick = {()=> this.setState({isVisble:false})}>隐藏< / div> ;:
< div onClick = {()=> this.setState({isVisble:true})}> Show< / div>}
< / div>
)
}
}
我在其他组件中使用此组件三次:
类MySuperComponent扩展React.Component {
render(){
return(
< div>
< MyComponent />
< MyComponent />
< MyComponent />
< / div>
)}
}
我需要在false时传递isVisible对于所有其他组件,如果其中一个具有isVisible为true
如何做到这一点?
谢谢
您应该控制组件,因此将 isVisble 移动到props,然后从MySuperComponent分配它。 / p>
还向MyComponent传递回调,以便它可以通知父母是否要更改状态。
你' d想要一些数据结构来存储这些状态。
class MySuperComponent扩展了React.Component {
构造函数(道具){
super(道具);
this.state = {children:[true,true,true]};
this.toggle = this.toggle.bind(this);
}
render(){
return(
< div>
{this.state.children.map((v,i)= >< MyComponent visible = {v} toggle = {()=> this.toggle(i)} />)}
< / div>
)
}
toggle(index){
this.setState({children:this.state.children.map((v,i)=> i!== index)});
}
}
类MyComponent扩展React.Component {
render(){
const text = this.props.visible? '可见':'隐藏';
return(< div onClick = {this.props.toggle}> {text}< / div>);
}
}
React.render(< MySuperComponent /> ;, document.getElementById('app'));
I have a simple component who show element onClick:
class MyComponent extends React.Component {
state = {
isVisible : false
}
render() {
const { isVisble } = this.state
return(
<div>
{isVisble ?
<div onClick={() => this.setState({isVisble: false})}>Hide</div> :
<div onClick={() => this.setState({isVisble: true})}>Show</div>}
</div>
)
}
}
I use this component three times in other component :
class MySuperComponent extends React.Component {
render() {
return(
<div>
<MyComponent />
<MyComponent />
<MyComponent />
</div>
)}
}
I need to pass isVisible at false for all other component if one of have isVisible to true
How to do that ?
Thanks
You should have your component controlled, so move isVisble to props and and then assign it from MySuperComponent.
Also pass MyComponent a callback so it can inform the parent if it wants to change the state.
You'd want some data structure to store that states.
https://codepen.io/mazhuravlev/pen/qxRGzE
class MySuperComponent extends React.Component {
constructor(props) {
super(props);
this.state = {children: [true, true, true]};
this.toggle = this.toggle.bind(this);
}
render() {
return (
<div>
{this.state.children.map((v, i) => <MyComponent visible={v} toggle={() => this.toggle(i)}/>)}
</div>
)
}
toggle(index) {
this.setState({children: this.state.children.map((v, i) => i !== index)});
}
}
class MyComponent extends React.Component {
render() {
const text = this.props.visible ? 'visible' : 'hidden';
return (<div onClick={this.props.toggle}>{text}</div>);
}
}
React.render(<MySuperComponent/>, document.getElementById('app'));
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