Reactjs 更新后，我无法重新呈现状态

状态更新后，我无法呈现数据

但一旦我提交，我就会在控制台上获得数据

我正在使用ContextApi

数据

<div>
      {datas.map(data => {
        return (
          <button
            key={data.id}
            onClick={() => handleData(data)}
            className="btn btn-primary m-4"
          >
            {data.title}
          </button>
        );
      })}
      <DetailData />
    </div>

{datas.map（数据=>{
返回(
handleData（数据）}
className=“btn btn主m-4”
>
{data.title}
);
})}

特定数据的详细信息 **其中包含一个输入框，用户将在其中写入注释，注释将显示在上面

**

返回(
{DetailData==null(
) : (
{DetailData.title}
Id:{DetailData.Id}
{DetailData.Description}

注释：{DetailData.comment}
)}
);

在您的ContextApi中进行此更改，查找添加的此行注释： 通过另一种方式，您需要在提交后更新DetailData

import React, { Component, createContext } from "react";
export const Contx = createContext();

export class ConProvider extends Component {
  state = {
    name: "",
    datas: [
      {
        id: 1,
        title: "Reactjs",
        Description:
          "React is a JavaScript library for building user interfaces. It is maintained by Facebook and a community of individual developers and companies. React can be used as a base in the development of single-page or mobile applications, as it is optimal for fetching rapidly changing data that needs to be recorded.",
        comment: []
      },
      {
        id: 2,
        title: "Bootstrap",
        Description:
          "Bootstrap is a free and open-source CSS framework directed at responsive, mobile-first front-end web development. It contains CSS- and JavaScript-based design templates for typography, forms, buttons, navigation and other interface components",
        comment: []
      }
    ],
    DetailData: null
  };

  handleData = data => {
    this.setState({
      DetailData: data
    });
  };
  handleInput = e => {
    this.setState({
      [e.target.name]: e.target.value
    });
  };

  handleSubmit = async commentid => {
    const com = this.state.name;
    const updateComment = await this.state.datas.map(c => {
      if (c.id === commentid) {
        return {
          ...c,
          comment: [...c.comment, com]
        };
      } else {
        return c;
      }
    });

    // Added this line
    const dData = await updateComment.filter(c => c.id === commentid);

    this.setState({
      datas: updateComment,
      name: "",
      DetailData: dData[0] // Added this line
    });

  };

  render() {
    return (
      <Contx.Provider
        value={{
          ...this.state,
          handleData: this.handleData,
          handleInput: this.handleInput,
          handleSubmit: this.handleSubmit
        }}
      >
        {this.props.children}
      </Contx.Provider>
    );
  }
}

import React，{Component，createContext}来自“React”；
export const Contx=createContext（）；
导出类提供程序扩展组件{
状态={
姓名：“，
数据：[
{
id:1，
标题：“Reactjs”，
说明：
“React是一个用于构建用户界面的JavaScript库。它由Facebook和个人开发者和公司社区维护。React可作为开发单页或移动应用程序的基础，因为它最适合获取需要记录的快速变化的数据。”，
评论：[]
},
{
id:2，
标题：“引导”，
说明：
“Bootstrap是一个免费、开源的CSS框架，面向响应性强的移动前端web开发。它包含用于排版、表单、按钮、导航和其他界面组件的基于CSS和JavaScript的设计模板”，
评论：[]
}
],
DetailData:null
};
handleData=数据=>{
这是我的国家({
详细数据：数据
});
};
handleInput=e=>{
这是我的国家({
[e.target.name]：e.target.value
});
};
handleSubmit=async commentid=>{
const com=this.state.name；
const updateComment=等待this.state.datas.map（c=>{
如果（c.id==commentid）{
返回{
C
评论：[…c.comment，com]
};
}否则{
返回c；
}
});
//增加了这一行
const dData=await updateComment.filter（c=>c.id==commentid）；
这是我的国家({
数据：更新注释，
姓名：“，
DetailData:dData[0]//添加了此行
});
};
render（）{
返回(
{this.props.children}
);
}
}

import React, { Component, createContext } from "react";
export const Contx = createContext();

export class ConProvider extends Component {
  state = {
    name: "",
    datas: [
      {
        id: 1,
        title: "Reactjs",
        Description:
          "React is a JavaScript library for building user interfaces. It is maintained by Facebook and a community of individual developers and companies. React can be used as a base in the development of single-page or mobile applications, as it is optimal for fetching rapidly changing data that needs to be recorded.",
        comment: []
      },
      {
        id: 2,
        title: "Bootstrap",
        Description:
          "Bootstrap is a free and open-source CSS framework directed at responsive, mobile-first front-end web development. It contains CSS- and JavaScript-based design templates for typography, forms, buttons, navigation and other interface components",
        comment: []
      }
    ],
    DetailData: null
  };

  handleData = data => {
    this.setState({
      DetailData: data
    });
  };
  handleInput = e => {
    this.setState({
      [e.target.name]: e.target.value
    });
  };

  handleSubmit = async commentid => {
    const com = this.state.name;
    const updateComment = await this.state.datas.map(c => {
      if (c.id === commentid) {
        return {
          ...c,
          comment: [...c.comment, com]
        };
      } else {
        return c;
      }
    });

    // Added this line
    const dData = await updateComment.filter(c => c.id === commentid);

    this.setState({
      datas: updateComment,
      name: "",
      DetailData: dData[0] // Added this line
    });

  };

  render() {
    return (
      <Contx.Provider
        value={{
          ...this.state,
          handleData: this.handleData,
          handleInput: this.handleInput,
          handleSubmit: this.handleSubmit
        }}
      >
        {this.props.children}
      </Contx.Provider>
    );
  }
}