How to use JavaScript and WebSocket to display real-time stock quotes

How to use JavaScript and WebSocket to realize real-time stock quotation display

Overview
Real-time stock quotation display is one of the needs often encountered in the financial field. By using Web technology, we can use JavaScript and WebSocket to display real-time stock quotes. This article explains how to use JavaScript and WebSocket with specific code examples.

Introduction to WebSocket
WebSocket is a protocol for full-duplex communication over a single TCP link. It provides a real-time, low-latency, and two-way communication method to establish a persistent connection between a web application and a server. WebSocket is a newly launched technology in HTML5, and modern browsers (such as Chrome, Firefox, Safari, etc.) already support WebSocket.

Stock Quote Display Requirements
In the process of displaying real-time stock quotes, we need to obtain real-time stock data from the server and display it on the Web page. Every time the market is updated, we need to display the new market data on the page in a timely manner.

Implementation steps

1. Create WebSocket connection
   First, we need to create a WebSocket object in JavaScript and connect to the WebSocket port of the server.

var socket = new WebSocket("ws://localhost:8080/stock");

2. Listening to WebSocket events
   We can listen to different events of WebSocket by adding event listeners, so that when new messages arrive and the connection is opened or closed, the corresponding operate.

socket.onopen = function() {
   console.log("WebSocket连接已打开");
}

socket.onmessage = function(event) {
   var data = event.data;
   // 处理消息
}

socket.onclose = function(event) {
   console.log("WebSocket连接已关闭");
}

3. Processing the received stock quotation data
   When WebSocket receives the message sent by the server, we need to parse and process the data.

socket.onmessage = function(event) {
   var data = JSON.parse(event.data);
   // 处理数据并更新页面
}

4. Update page
   According to the received stock market data, we can use JavaScript to dynamically update the corresponding content on the page. For example, we can display the stock's name, code, latest price and other information on the page.

var stockName = document.getElementById("stockName");
stockName.innerHTML = data.name;

var stockCode = document.getElementById("stockCode");
stockCode.innerHTML = data.code;

var stockPrice = document.getElementById("stockPrice");
stockPrice.innerHTML = data.price;

5. Refresh market data in real time
   In order to maintain the real-time nature of market data, we need to regularly send requests to the server to obtain the latest stock market data and display it on the page .

setInterval(function() {
   socket.send("get_stock_data");
}, 1000);

In this way, every second, a request will be sent to the server to obtain the latest stock market data.

Summary
By using JavaScript and WebSocket, we can easily realize real-time stock quotation display. Utilizing the full-duplex communication feature of WebSocket, we can receive server-side market data in real time and dynamically display it on the Web page through JavaScript. The above gives the basic steps and code examples for WebSocket real-time stock quotation display. I hope it will be helpful to readers when developing the real-time quotation display function.

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