Скачать или смотреть Learn How to Automatically Add Rows to Your Table with WebSocket Data in JavaScript

Discover how to dynamically update an HTML table with real-time Bitcoin price data from a WebSocket using JavaScript.
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Automatically Adding Rows to a Table with WebSocket Data in JavaScript

Creating real-time dashboards can be an exciting way to visualize data, but if you're new to JavaScript, it might feel overwhelming. One common task developers face is how to dynamically add rows to an HTML table when new data arrives, especially when using WebSocket connections. In this guide, we will walk through how to achieve this using a Bitcoin price update dashboard as an example. So, let's get started!

The Problem: Updating Prices in Real-Time

You are working on a Bitcoin price update dashboard, and you have successfully connected to a WebSocket that sends you live price updates every second. The challenge now is to take this incoming data and insert it into an HTML table. You’ve noticed that while you are receiving the data correctly, your attempts to iterate through the data and add rows to the table haven’t been successful.

Here’s a simplified version of the HTML structure you are working with:

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Now that we have the problem defined, let’s look at the solution.

The Solution: Inserting Rows Dynamically

To dynamically insert rows into your HTML table each time you receive new price data, you'll need to create a function that constructs the table row and appends it to the table body. Below is a step-by-step breakdown of how to do this.

Step 1: Create a Function to Insert Rows

You need to define a function called insertRow. This function will take the current price as a parameter and create a new table row containing the price information.

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Modify the WebSocket Message Handler

Now, you need to update your WebSocket’s message handler to call insertRow whenever new data comes in. The price will be extracted from the incoming message, and then inserted into your table body.

[[See Video to Reveal this Text or Code Snippet]]

What Happens Next?

With this setup, every time new Bitcoin price data is received from the WebSocket, a new row will be created in the HTML table, displaying the latest price.

Summary

In this post, we tackled the challenge of dynamically adding rows to an HTML table using JavaScript and WebSocket data. By defining a function to create table rows and updating it whenever new data arrives, you can create a responsive, real-time dashboard that showcases live price information.

Now, you can continue customizing your dashboard or explore more advanced features like sorting and filtering the data. Happy coding!