Ract父组件调用子组件方法

1、父子组件都是class

父组件

import React, {Component} from 'react';
import {Button} from 'antd';
import TableList from './TableList';export default class ParentPage extends Component {childRef = React.createRef();render() {return (<div><Button onClick={() => {const formValues = this.childRef.init(); // 调用子组件方法console.log(formValues, '===formValues=')}}>获取子组件表单的值</Button><TableList onRef={(ref) => {this.childRef = ref;}}></TableList></div>)}
}

子组件

import React, {Component} from 'react';
import {Form, Input} from 'antd';
const FormItem = Form.Item;export default class ChildPage extends Component {formRef = React.createRef();constructor(props) {super(props)}componentDidMount() {this.props.onRef(this); // 把子组件的this暴露给父组件}init() {const formValues = this.formRef.current.getFieldsValue();return formValues;}render() {return (<Form ref={this.formRef}><FormItem label={'测试'} name={'test'}><Input/></FormItem></Form>)}
}

**2、父子组件都是hooks

useRef，useImperativeHandle,forwardRe会用到这3个hooks

父组件

import React, { useRef } from 'react';
import { Button } from 'antd';
import TableList from './TableList';export default function ParentPage () {const childForm = useRef();return (<div><Button onClick={() => {const values = childForm.current.getFormVal();console.log(values,'==values==')}}>获取子组件表单的值</Button><TableList ref={childForm}></TableList></div>)
}

子组件

import React, { useImperativeHandle, forwardRef } from 'react';
import {Form, Input} from 'antd';
const FormItem = Form.Item;export default forwardRef ((props, ref) =>{const [form] = Form.useForm();useImperativeHandle(ref, ()=>({getFormVal: () =>{return init();}}))const init = () =>{const formValues = form.getFieldsValue();return formValues;}return (<Form form={form}><FormItem label={'测试'} name={'test'}><Input/></FormItem></Form>)
})

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