How to Easily Use Variables for Dynamic CSS Styles in JavaScript

Learn how to write a dynamic CSS style in `JavaScript` using variables. This guide explains step-by-step the solution using template literals.
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How to Easily Use Variables for Dynamic CSS Styles in JavaScript

Introduction

If you're diving into JavaScript and want to make your web pages more dynamic, you might be wondering how to correctly apply colors to your HTML elements using variables. For instance, you want to change the text color and background color based on variable values. In this guide, we’ll tackle the common issue of applying CSS styles with variable values and show you how to do it effectively.

The Problem

You may want to set up a table's text color and background color dynamically—using two variables, bgcolor and textcolor—which hold the color values such as "red", "black", or any valid CSS color values. Here’s a quick look at the initial attempt to achieve this:

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

However, if you run this code, it won't produce the desired results. Here's why: the colors are not being interpreted as the variable values you've set but rather as literal strings instead. So what can you do?

The Solution

The solution comes in the form of template literals, a convenient feature in JavaScript. They allow you to embed expressions and include your variable values easily. Here’s how you can implement it:

Step 1: Understanding Template Literals

Template literals are enclosed by backticks (`), allowing for multi-line strings and embedded expressions. This means you can directly inject your variable values into the string.

Step 2: Implement the Correct Syntax

To correctly apply the values of bgcolor and textcolor, you would write the code as follows:

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

How Does It Work?

Embedding Variables: The ${variableName} syntax allows you to insert the value of a variable into your string dynamically.

Style Application: By using this syntax, the cssText property will correctly interpret textcolor and bgcolor as the actual values assigned to those variables rather than as strings.

Example Code Snippet

Here's a complete example demonstrating how to use it in practice:

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

Additional Tips

Always ensure your variable names are correctly defined and their values are valid CSS colors.

Test your code in different browsers to ensure compatibility; modern browsers support template literals but always good to verify.

Conclusion

By utilizing template literals in JavaScript, you can dynamically set CSS properties using variables effectively. This not only makes your code cleaner and more readable but also allows you to enhance the user experience on your web pages. So next time you need to change colors based on variable values, remember this simple solution! Happy coding!