React Js Hooks / props.Children on chatbot

Question

您好，我有以下逻辑来制作一个简单的聊天机器人，但由于某种原因我无法显示消息：

const ChatBot = () => {
  return (
    <Styled.ChatBox>
      <ChatMessage bot={true}>Hi.</ChatMessage>
      <ChatMessage bot={false}>Hello.</ChatMessage>
    </Styled.ChatBox>
  );
};

这是我的聊天机器人：

function ChatMessage(props) {
  return (
    <Styled.ChatMessage bot={props.bot}>{props.children}</Styled.ChatMessage>
  );
}

ChatMessage.defaultProps = {
  bot: false,
};

const Chat = props => {
  console.log(props.children);
  return (
    <Styled.ChatBox>
      <Styled.ChatHeader />
      <Styled.ChatLog>{props.children}</Styled.ChatLog>
      <Styled.ChatInput>
        <textarea placeholder="aaaaa ..." rows={4} />
        <button>Send</button>
      </Styled.ChatInput>
    </Styled.ChatBox>
  );
};

我真的无法确定我做错了什么 我不知道我是否以最好的方式或最好的逻辑做到了 我有一个用样式化的 comp 制作的 div 这将是根据道具机器人显示消息的位置 我会收到消息，但由于某种原因我无法显示消息。 示例： https://codesandbox.io/s/eager-torvalds-fyi77

Answer 1

实际上，您的chatbot/index.js 文件中缺少export default ChatBot。

Answer 2

您不是从src/chatbot/index.js 导出ChatBot，您实际上是在导出Chat：

import React from "react";
import { Chat, ChatMessage } from "./chat";
const ChatBot = () => {
  return (
    <Chat>
      <ChatMessage bot={true}>Hi.</ChatMessage>
      <ChatMessage bot={false}>Hello.</ChatMessage>
    </Chat>
  );
};

//export default Chat; // You're just exporting what you imported
export default ChatBot; // This is correct

如果你改变它应该可以工作。请参见下面的示例。您需要全屏运行 sn-p，因为由于您的样式，消息将显示在屏幕外。

const {useState, useEffect, Fragment} = React;
const {css} = styled;

const messageBot = css`
  align-self: flex-start;
  background-color: #e0e0e0;
`;
const messageClient = css`
  align-self: flex-end;
  background-color: #ffffff;
`;
const ChatBox = styled.div`
  position: absolute;
  position: fixed;
  right: 20px;
  bottom: 20px;
  display: flex;
  flex-direction: column;
  width: 22em;
  height: 30em;
  border-radius: 6px;
  background-color: red;
`;
const ChatLog = styled.div`
  display: flex;
  flex-direction: column;
  width: 100%;
  overflow: auto;
  flex: 1 100%;
  background: blue;
`;

const ChatMessage = styled.div`
  margin: 1ex;
  padding: 1ex;
  border-radius: 2px;
  ${props => (props.bot ? messageBot : messageClient)}
`;

const ChatInput = styled.div`
  display: flex;
  padding: 1ex;
  max-height: 60px;
  height: 100%;
  background: yellow;
  border-bottom-left-radius: 6px;
  border-bottom-right-radius: 6px;
  flex: none;
  & > textarea {
    width: 100%;
    border: none;
    box-sizing: border-box;
    height: 60px;
    padding: 20px;
    flex: 1 1;
    resize: none;
  }
`;

const ChatHeader = styled.div`
  border-top-left-radius: 6px;
  border-top-right-radius: 6px;
  flex: none;
  background: green;
  height: 30px;
`;

const Styled = {
  ChatBox,
  ChatLog,
  ChatHeader,
  ChatInput,
  ChatMessage
};


function ChatMessageCmp(props) {
  return (
    <Styled.ChatMessage bot={props.bot}>{props.children}</Styled.ChatMessage>
  );
}

ChatMessageCmp.defaultProps = {
  bot: false
};

const Chat = props => {
  console.log(props.children);
  return (
    <Styled.ChatBox>
      <Styled.ChatHeader />
      <Styled.ChatLog>{props.children}</Styled.ChatLog>
      <Styled.ChatInput>
        <textarea placeholder="aaaaa ..." rows={4} />
        <button>Send</button>
      </Styled.ChatInput>
    </Styled.ChatBox>
  );
};

const ChatBot = () => {
  return (
    <Chat>
      <ChatMessageCmp bot={true}>Hi.</ChatMessageCmp>
      <ChatMessageCmp bot={false}>Hello.</ChatMessageCmp>
    </Chat>
  );
};

function App() {
  return <ChatBot />;
}

ReactDOM.render(<App />, document.getElementById("app"));

.App {
  font-family: sans-serif;
  text-align: center;
}
body {
  padding: 0;
  margin: 0;
}

<script crossorigin src="https://unpkg.com/react@16/umd/react.production.min.js"></script>
<script crossorigin src="https://unpkg.com/react-dom@16/umd/react-dom.production.min.js"></script>
<script src="https://unpkg.com/styled-components@4.4.1/dist/styled-components.min.js"></script>

<div id="app"></div>