How to use WebSocket and JavaScript to achieve multi-person online document collaboration

How to use WebSocket and JavaScript to achieve multi-person online document collaboration

Abstract: With the rapid development of cloud computing and network technology, multi-person online collaboration has become more and more important. The more important it is. This article will introduce how to use WebSocket and JavaScript to achieve multi-person online document collaboration, and provide specific code examples.

Keywords: WebSocket, JavaScript, multi-person online, document collaboration, code examples

Introduction:
In modern society, multi-person collaboration has become a trend. As the office scene changes, people urgently need a way to facilitate multiple people to edit and work together online. This article will introduce how to use WebSocket and JavaScript to achieve multi-person online document collaboration, and provide specific code examples.

1. Overview of WebSocket:
   WebSocket is a network protocol for full-duplex communication over a single TCP connection. It provides real-time, efficient two-way communication and can easily push information from the server to the client. Therefore, we can use WebSocket to achieve multi-person online document collaboration.
2. The basic idea of ​​document collaboration:
   In the scenario of multi-person online document collaboration, a server is first needed to save the document content and handle the logic of multi-person collaboration. When the document changes, the client conducts two-way communication with the server through WebSocket and updates the document content in real time. The following is a simple basic idea:

(1) Server:
First, we need a server to handle WebSocket connections and messages. The server can be built using Node.js. The code example is as follows:

const WebSocket = require('ws');

const wss = new WebSocket.Server({ port: 8080 });

wss.on('connection', ws => {
  ws.on('message', message => {
    // 处理收到的消息，比如更新文档内容或发送广播
    wss.clients.forEach(client => {
      if (client.readyState === WebSocket.OPEN) {
        client.send(message);
      }
    });
  });
});

(2) Client:
On the client side, we need to use JavaScript to handle WebSocket connections and messages. The code example is as follows:

const socket = new WebSocket('ws://localhost:8080');

socket.onopen = () => {
  // 处理WebSocket连接
};

socket.onmessage = event => {
  // 处理收到的消息，比如更新文档内容
};

socket.onclose = () => {
  // 处理WebSocket关闭
};

socket.onerror = error => {
  // 处理错误
};

3. Realizing multi-person online document collaboration:
   With the above basic ideas and code examples, we can further realize the function of multi-person online document collaboration. The specific steps are as follows:

(1) Define the document format:
First, we need to define the format of the document, such as saving it in JSON format.

(2) Process user input:
When the user edits in the document, the client needs to listen and send the changed content to the server. The code example is as follows:

document.oninput = () => {
  const content = document.getElementById('content').innerText;
  socket.send(JSON.stringify({ type: 'update', content }));
};

( 3) Process server broadcast:
After receiving the message sent by the client, the server can broadcast to all connected clients. The code example is as follows:

wss.on('connection', ws => {
  ws.on('message', message => {
    const { type, content } = JSON.parse(message);
    if (type === 'update') {
      // 处理更新的内容，比如更新文档内容或发送广播
      // 广播给所有连接的客户端
      wss.clients.forEach(client => {
        if (client.readyState === WebSocket.OPEN) {
          client.send(JSON.stringify({ type: 'update', content }));
        }
      });
    }
  });
});

(4) Process the client's broadcast:
After receiving the message broadcast by the server, the client needs to process the updated content. The code example is as follows:

socket.onmessage = event => {
  const { type, content } = JSON.parse(event.data);
  if (type === 'update') {
    // 处理更新的内容，比如更新文档内容
    document.getElementById('content').innerText = content;
  }
};

Summary:
This article introduces the use of WebSocket and JavaScript to achieve multi-person online document collaboration method, and provides specific code examples. Using the real-time two-way communication feature of WebSocket, we can easily realize the function of online editing and collaborative work by multiple people. I hope this article will be helpful to everyone in actual development.

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