javascript - 如何在reactjs中强制从父组件更新子组件

Question

当父状态改变时我需要重新渲染子组件

在parent Component中设置语言一旦语言发生变化， child 也将使用所选语言进行更新

Parent.js

import React, { Component } from "react";
import Child from "./Child.js";

class Parent extends Component {
  constructor(props) {
    super(props);    
    this.state ={
        lblName: "Name",
        lblGender: "Gender",
        lblDOB: "Date Of Birth",
        lblNatio: "Nationality",
      };
  }
    ChangeLanguage(lang, e){
      if(lang === "en"){
           this.setState(
           {
              lblName: "Name",
              lblGender: "Gender",
              lblDOB: "Date Of Birth",
              lblNatio: "Nationality",
           });
      }
      else if(lang === "sp"){
           this.setState(
           {
              lblName: "Nombre",
              lblGender: "Género",
              lblDOB: "Fecha de nacimiento",
              lblNatio: "Nacionalidad",
           });
      }

    }
    render() {    
    return (
        <Child ChildData={this.state}>
        <button onClick = {this.ChangeLanguage.bind(this, en)}>English</button>
        <button onClick = {this.ChangeLanguage.bind(this, sp)}>Spanish</button>
    )}
}

父状态传递给子组件并作为子组件

Child.js

import React, { Component } from "react";


class Parent extends Component {
  constructor(props) {
    super(props);    
    this.state = this.props.ChildData;
  }
    componentWillReceiveProps(nextProps){
        this.forceUpdate();
        this.setState(nextProps.ChildData);
    }

    render() {    
    return (
        <div>
             <div>
                  <label>lblName</label>
                  <input type="Text"></input>
             </div>
             <div>
                  <label>lblGender</label>
                  <input type="Text"></input>
             </div>
             <div>
                  <label>lblDOB</label>
                  <input type="Date"></input>
             </div>
             <div>
                  <label>lblNatio</label>
                  <input type="Text"></input>
             </div>
        </div>
    )}
}

尝试使用这两种解决方案 forceUpdate 并设置状态...我失败了我想在语言 c 时更新父级的标签

Answer 1

只需将带有语言的 Props 添加到子控件中并从父控件中传递即可