如何在反应中从父级调用子组件函数

问题描述：

如何在react中从Parent调用子组件函数

How to call child component function from Parent in react

点击按钮需要从parentComponent调用子函数needToBeCalled()

on click of button need to call child function needToBeCalled() from parentComponent

请参考下面的片段

class Parent {

render(){
return(
<button onClick={() => }>Click</button>
<Child />
)
}
}

class Child {
function needToBeCalled() {

}
render(){
return (

)
}
}

答

这是 React 中的反模式，但你可以使用 ref 来做类似的事情

It's antipattern in React, but you can use ref to do something like so

  class Parent {
    constructor(props) {
    super(props);
     this.myRef = React.createRef();
   }
  render(){
     return(
      <button onClick={this.myRef.current}>Click</button>
      <Child myRef={this.myRef}/>
    )
   }
  }

  class Child {
    componentDidMount(){
      function needToBeCalled() {

    }
    this.props.myRef.current = needToBeCalled
  }
  render(){
   return (

    )
 }
}

如何在反应中从父级调用子组件函数

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