How to use JavaScript and WebSocket to implement a real-time online recruitment system

How to use JavaScript and WebSocket to implement a real-time online recruitment system

Introduction:
With the development of the Internet and the advancement of intelligence, the needs of the recruitment industry are also increasing. increase. Traditional recruitment methods gradually appear to be insufficiently efficient and real-time, so using JavaScript and WebSocket to implement a real-time online recruitment system has become a good choice. This article will introduce how to use JavaScript and WebSocket to build a real-time online recruitment system, and give specific code examples.

1. Background knowledge

1. WebSocket: WebSocket is a TCP-based protocol that can establish a two-way communication connection between the browser and the server. Compared with traditional HTTP requests, the advantage of WebSocket is that it can realize the function of the server actively pushing messages to the client, thereby achieving real-time communication.
2. JavaScript: JavaScript is a scripting language widely used in web development. Through JavaScript, we can operate elements in web pages, modify styles, respond to user events, etc.

2. Implementation steps

1. Design of front-end page
   First, we need to design a front-end page to display recruitment information and allow users to choose. This page can be laid out and styled using HTML and CSS, and then JavaScript is used to control user actions and communicate with the backend.
2. Establishing a WebSocket connection
   In JavaScript, we can use the WebSocket object to establish a WebSocket connection with the server. First, use the WebSocket constructor to create a WebSocket object, and then use the object's open event listener to handle the logic after the connection is successful.

// 建立WebSocket连接
var socket = new WebSocket('ws://localhost:8080/realtime');

// 连接成功时的处理逻辑
socket.onopen = function() {
  console.log('WebSocket连接成功');
};

3. Listening to server messages
   After the WebSocket connection is successfully established, we can use the onmessage event listener to listen for messages pushed by the server to the client. After receiving the message, we can use JavaScript to update the content of the front-end page.

// 监听服务器推送的消息
socket.onmessage = function(event) {
  var message = event.data;
  // 更新前端页面内容
  document.getElementById('messageBox').innerHTML = message;
};

4. Send a message to the server
   In addition to receiving messages from the server, we can also use the send method of the WebSocket object to send messages to the server. After the user clicks a button or enters a form, the user's input information can be obtained through JavaScript and then sent to the server.

// 向服务器发送消息
function sendMessage() {
  var message = document.getElementById('inputBox').value;
  socket.send(message);
}

5. Implementation of backend server
   WebSocket connection requires a backend server to support, we can use Node.js to implement a simple WebSocket server.

// 引入websocket模块
const WebSocket = require('ws');

// 创建WebSocket服务器
const wss = new WebSocket.Server({ port: 8080 });

// 监听WebSocket连接事件
wss.on('connection', function (socket) {
  console.log('WebSocket连接成功');

  // 监听消息事件
  socket.on('message', function (message) {
    console.log('收到消息：' + message);
    // 处理逻辑
  });

  // 发送消息
  socket.send('欢迎访问招聘系统');
});

3. Summary
Through the introduction of this article, we have learned how to use JavaScript and WebSocket to build a real-time online recruitment system. First, we designed a front-end page to display job information and interact with users. We then used JavaScript code to establish a WebSocket connection to the server and listen for push messages from the server as well as send messages to the server. Finally, we implemented a simple WebSocket server using Node.js. I hope this article will help you build a real-time online recruitment system.

Reference:

1. WebSocket API: https://developer.mozilla.org/en-US/docs/Web/API/WebSocket
2. Building a WebSocket Server in Node.js: https://www.npmjs.com/package/ws

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