Creating a React App with CSS Modules: Fixing Multiple Class Issues

Learn how to resolve issues with CSS modules in a React app, enabling you to toggle multiple classes at runtime effectively.
---

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: React App with css module multiple classes

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Resolving CSS Module Issues in Your React App

When developing applications with React, many developers choose to leverage the modularization provided by CSS Modules. However, issues can arise, particularly when it comes to applying multiple classes from these modules. Today, we'll discuss a common problem encountered in a basic React application and provide a thorough solution.

The Problem

Imagine you’ve created a React component that uses CSS Modules for styling. In this instance, your component looks like this:

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

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

What's Wrong?

In this setup, you've noticed that the subclass .awesome is not applying styles as expected, while the .great subclass appears to work just fine. When inspecting your CSS in the browser, you see that the .awesome class is not generated, which is the root of the problem.

The Solution

To effectively work with multiple CSS classes within CSS Modules in a React application, you must ensure you reference your styles correctly. Instead of passing class names as strings, you should make use of the styles object, which holds your module's class names.

Step-by-Step Fix

Here’s the modification you need to make in your button’s render method:

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

By doing this, you're ensuring that the styles for .awesome are referenced through the styles module object, which will allow it to be generated correctly during the styling process.

Implementing the Change

Update Your Component: Replace the button element in your component with the revised className property as indicated above.

Test Your Component: After you've applied the changes, make sure to run your application and see if the .awesome style now appears in the generated CSS.

Inspect Results: Open the browser's developer tools to inspect the resulting styles applied to your button. You should now see the styles for both .awesome and .great as expected.

Conclusion

Navigating the integration of CSS Modules in a React application can be tricky, especially when dealing with multiple classes. By consistently referencing class names through the styles object, you can seamlessly apply and toggle styles dynamically in your components. As you continue to develop your React app, keep this approach in mind to avoid similar issues in the future.

Happy coding, and may your buttons be ever stylish!