How uniapp application realizes real-time communication and instant chat

UniApp is a cross-platform application development framework that can quickly build various types of applications, including real-time messaging and instant chat applications. This article will introduce how to implement real-time communication and instant chat functions in UniApp applications, and provide some specific code examples.

1. Real-time communication
Real-time communication refers to the immediate response when transferring information between users. Common application scenarios include online customer service, real-time message push, etc. Real-time communication in UniApp can be achieved with the help of WebSocket protocol. The following is the sample code:

1. Introduce the WebSocket library in main.js

   import * as io from '@/libs/socket.io.js';
   Vue.prototype.$io = io;

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2. Create a WebSocket connection in a page that requires real-time communication

   onLoad() {
     this.socket = this.$io('wss://your-websocket-url');
     this.socket.on('connect', () => {
    console.log('WebSocket连接成功');
     });
     this.socket.on('message', (data) => {
    console.log('接收到消息：', data);
    // 处理接收到的消息
     });
   },
   
   onUnload() {
     if (this.socket) {
    this.socket.close();
     }
   }

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3. Send a message

   sendMessage() {
     this.socket.emit('message', {
    content: 'Hello',
    userId: '123'
     });
   }

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In the above example code, by introducing A WebSocket library creates a WebSocket connection and listens to the message event after the connection is successful, which is used to receive and process messages sent by the server. When sending a message, call the socket.emit method to send the data to the server.

2. Instant Chat
The instant chat function is an application of real-time communication, which realizes real-time dialogue between users through the chat window. The following aspects need to be considered when implementing instant chat in UniApp:

1. User login and authentication
   In chat applications, users need to log in and authenticate to ensure the security of the user's identity. You can use uni login authorization component or third-party login plug-in for user authentication.
2. Creating a chat room and displaying a message list
   According to the different chat objects, a unique chat room can be created for each chat object. In the chat page, connect to the server through websocket to realize instant sending and receiving of messages.
3. Sending and receiving messages
   By clicking the send button or pressing the Enter key, the message entered by the user is sent to the server through websocket. After the server receives the message, it forwards it to the chat partner.
4. Update chat records in real time
   By listening to websocket events, after receiving a message, add the message to the chat record list, thereby achieving real-time update of the chat content.

The following is a sample code:

1. Create a chat page

   <template>
     <view>
    <scroll-view class="chat-list" scroll-y>
      <view v-for="(message, index) in messages" :key="index">
        {{ message }}
      </view>
    </scroll-view>
    <input class="chat-input" type="text" v-model="inputMessage" @confirm="sendMessage" placeholder="请输入消息内容" />
    <button class="send-btn" @click="sendMessage">发送</button>
     </view>
   </template>
   
   <script>
   export default {
     data() {
    return {
      inputMessage: '',
      messages: []
    }
     },
   
     methods: {
    sendMessage() {
      const message = {
        content: this.inputMessage,
        sender: 'UserA', // 发送者
        receiver: 'UserB' // 接收者
      };
   
      this.socket.emit('message', message);
      this.messages.push(message);
      this.inputMessage = '';
      this.scrollToBottom();
    },
   
    scrollToBottom() {
      // 滚动到底部
    }
     },
   
     created() {
    this.socket = this.$io('wss://your-websocket-url');
    this.socket.on('connect', () => {
      console.log('WebSocket连接成功');
    });
    this.socket.on('message', (message) => {
      console.log('接收到消息：', message);
      this.messages.push(message);
      this.scrollToBottom();
    });
     },
   
     beforeDestory() {
    if (this.socket) {
      this.socket.close();
    }
     }
   }
   </script>

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In the above code, the chat page contains a A message list and an input box. After the user enters the message, the message is sent to the server by clicking the Send button or pressing the Enter key. The server then forwards the message to the recipient, adds the message to the message list, and displays it on the page in real time.

To sum up, the main steps to implement real-time communication and instant chat functions in UniApp applications include establishing WebSocket connections, sending and receiving messages, and updating chat records in real time. Through the above sample code, we can quickly implement real-time communication and instant chat functions in the UniApp application.

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