Mastering CSS Modules in React: Using Multiple ClassNames Made Easy

Discover how to effectively use `CSS Modules` in `React`, including tips for applying multiple classNames for styling.
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Mastering CSS Modules in React: Using Multiple ClassNames Made Easy

When developing with React, styling your components in an efficient and maintainable way is essential. One popular method developers are embracing is CSS Modules. However, for those new to this approach, questions may arise about how to effectively apply multiple class names. In this guide, we will address a specific example of how to combine multiple classNames when using CSS Modules with React.

The Problem

You might be new to CSS Modules and React, and wondering how to incorporate multiple classes into your components. For instance, you may have defined the following classes in your CSS file:

.button

.button--decrease

And you want to apply both the .button and .button--decrease classes to a button component without losing the benefits of scoped CSS provided by CSS Modules.

In the provided example of a simple counter component, you already have one class applied. The challenge remains: How can you add another class to the className property?

The Solution: Combining ClassNames

Fortunately, overcoming this challenge is straightforward! You can easily concatenate multiple class names using template literals in JavaScript. This method allows you to combine them seamlessly.

Step-by-Step Implementation

Here’s how you can implement this in your Counter component:

Import Your CSS Module: You should have your CSS defined with the classes you want to use. In our case, these are .button and .button--decrease.

Use Template Literals for className: To apply multiple classes, utilize a template literal to join them together.

Here’s what your updated button component might look like:

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

The Breakdown

Template Literals: The `${...}` syntax is a template literal, allowing you to embed expressions such as variables within string literals.

Dynamic Class Assignment: This method dynamically assigns multiple classes, combining the benefits of CSS Modules while retaining the ability to use additional styles.

Complete Code Example

Here's how this integration looks in the complete context of the Counter component:

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

Conclusion

Using multiple classNames with CSS Modules in React is not only possible but also simple. By utilizing template literals, you can combine various styles and leverage the full power of modular, maintainable CSS in your projects.

With this knowledge in hand, you're now equipped to style your React components more flexibly and efficiently. Keep experimenting with your styles to create beautiful user interfaces!