How to Fix CSS Selectors Not Working with React CSS Modules

Discover how to resolve issues with CSS selectors in React CSS Modules, ensuring styles are applied as expected.
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Understanding CSS Selectors in React CSS Modules

When working with React, you might run into situations where your CSS selectors just don't seem to apply to your components as they should. This typically happens when using CSS modules. In this post, we will explore a common problem involving CSS selectors not working correctly when transitioning styles from traditional CSS to React CSS Modules. We’ll offer a detailed solution to fix this issue.

The Problem: CSS Selectors Not Applying

Imagine you've created a carousel component using CSS and JSX, and everything seems to work perfectly. Here’s a quick breakdown of the original CSS and JSX:

Initial CSS

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

Initial JSX

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

Transitioning to React CSS Modules: The Challenge

When you create a CSS module, you typically use a different naming convention. Let's look at how your CSS might look in this new format:

Revised CSS Module

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

And the corresponding JSX might be:

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

In this updated code, render-1 isn't being resolved to a module style, which means the intended widths aren't applied correctly. This is frustrating, and you might wonder if there’s a way to fix it.

The Solution: Correctly Utilizing CSS Modules

To fix this issue, it is essential to apply the styles in a way that conforms to the CSS module principles. Here's how you can do this correctly.

Steps to Correctly Apply Styles

Use the CSS Module's ClassName for render-1:
Change the class string for render-1 to access it from the styles object.

Modify Your JSX Code:
Update the portion that renders the className to incorporate the correct styles.

Here’s how the fixed JSX should look:

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

Key Takeaways

Prefixing with styles: Always grab your CSS module classes from the styles object when using CSS Modules in React. This ensures that your components apply the correct scoped styles.

No dashes in class names: CSS Modules do not support hyphenated class names directly. Convert render-1 to render1 (or use camelCase) and ensure you declare this in your CSS module.

Conclusion

By correctly utilizing the CSS Module syntax and ensuring that you apply class names from the styles object, you can effectively resolve issues with selectors not working as intended. This approach not only organizes your styles but also prevents conflicts that can arise from using global CSS names. Happy coding!