Скачать или смотреть How to Color HTML Table Rows Based on Regular Expressions and Conditions

Learn how to dynamically change the background color of HTML table rows using jQuery based on the last digit of a specified order ID.
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This video is based on the question https://stackoverflow.com/q/63484004/ asked by the user 'TireGuy' ( https://stackoverflow.com/u/14117503/ ) and on the answer https://stackoverflow.com/a/63484160/ provided by the user 'Rory McCrossan' ( https://stackoverflow.com/u/519413/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Color HTML Table Rows Based on Regular Expressions and Conditions

HTML tables are often a crucial part of web applications, especially when displaying data dynamically. One common requirement is to enhance the visual representation of data by coloring table rows based on specific conditions. In this guide, we will discuss how to color HTML table rows using jQuery and regular expressions (regex) based on the last digit of an order ID. Let’s dive in!

The Problem

Imagine you have an order table where each order is represented by an ID in the first column of each row. You want to set the background color of the rows depending on the last digit of the order ID. For example:

If ID ends in 0, 3, 6, or 9, the row should have a color # adcbe3.

If it ends in 1, 4, or 7, a different color is used.

If it ends in 2, 5, or 8, yet another color is applied.

However, your initial code attempts to implement this but fails to achieve the desired outcome. Let’s go through the solution step-by-step.

The Solution

1. Understanding the Code Logic

In the original JavaScript code provided, the logic attempts to find the first column of each row and apply a background class based on the last digit of the ID. However, there are two key mistakes:

The variable firstCol is currently holding a jQuery object, not the text content we need.

The this keyword within the each() loop is not correctly used, which leads to applying styles across all rows instead of the current one.

2. Modifying the Code

Here’s the corrected version that addresses the issues:

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

3. Styling the Rows

You will also need to add some CSS to define the colors for each class:

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

4. HTML Structure

Ensure your HTML includes the necessary elements:

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

5. An Alternative Approach

For a more succinct solution, you can streamline the logic as follows:

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

This logic checks whether the ID is a purely numerical value and applies background color classes based on the numeric value of the last digit.

Conclusion

Color-coding HTML table rows based on the contents of cells can vastly improve the readability and user experience of your web applications. By implementing the solutions discussed above, you can easily manipulate row styles based on specific criteria. Whether you're displaying order IDs or any other numeric values, using jQuery and regex allows for dynamic adjustment in a clean and efficient way.

Feel free to explore more and modify the styles to suit your application's needs!