父组件
在父组件中,编写如下:
类中定义child,用于寄存子组件的作用域
public child: any;Copy to clipboardErrorCopied
绑定子组件作用域
public onRef(ref:any){ this.child = ref}Copy to clipboardErrorCopied
子组件上绑定ref
<ChildPage onRef={(el)=>this.onRef(el)} />Copy to clipboardErrorCopied
- onRef 绑定this(第3步,不应用箭头函数的状况)
this.onRef = this.onRef.bind(this)Copy to clipboardErrorCopied
子组件
在子组件中,编写如下:
constructor中onRef绑定this
this.props.onRef(this)Copy to clipboardErrorCopied
实现以上4步骤,父组件中能够轻易调用子组件中state的值以及办法。
export class ParentCom extends React.Component<{}, {}> { constructor(props:{}){ super(props); this.onRef = this.onRef.bind(this); } public child: any; onRef(ref:any){ this.child = ref; } getChildFun(){ this.child.testFun(); } render(){ return ( <div> <span>父组件</span> <ChildCom onRef={this.onRef}></ChildCom> </div> ) }}interface childProps{ onRef? : any}export class ChildCom extends React.Component<childProps, {}> { constructor(props:{}){ super(props); this.props.onRef(this); } testFun(){ console.log(123) } render(){ return ( <div> <span>子组件</span> </div> ) }}