How to Dynamically Pass Multiple Classes to Child Component Using CSS Modules in React

Discover how to effectively pass multiple class names to child components in React using `CSS Modules`. This guide breaks down the process and presents simple solutions for developers at all levels.
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How to Dynamically Pass Multiple Classes to Child Component Using CSS Modules in React

React is a powerful library for building user interfaces, and one of its strengths is the ability to manage dynamic styles using CSS Modules. However, if you are new to React, you might encounter some challenges when trying to pass multiple class names to child components. In this post, we will explore how to achieve this effectively and with ease.

The Problem

In a typical React scenario, you may want to utilize multiple CSS classes for styling your component. For instance, let’s say we have a parent component that dynamically sends class names to a child component. The parent component sends a string containing multiple classes, such as p-1 color-red, but the child component only knows how to work with single class names as it uses CSS Modules.

Here's a brief look at the code you might start with:

Parent Component Code

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

Child Component Code

In the child component, you might have:

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

The Solution

To solve this issue and allow passing of multiple class names dynamically, we can split the headerClass string in the child component and combine the associated styles. Let’s break down the solution step by step:

Step 1: Modify the Child Component

Split the headerClass String: We will use JavaScript’s split method to divide the headerClass string into an array of class names.

Map the Classes to Styles: Using the array of classes, we will map each class name to its corresponding style using CSS Modules.

Construct the Final Class Name: We'll aggregate all the styles into a single class string that can be applied to the div.

Implementation:

Here's how you can update your child component:

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

Explanation of the Code:

reduce Method: We use reduce to iterate over the array and concatenate the styles into a single string that will be used in the className attribute of the div.

Final Output: Now you can dynamically pass multiple classes, and they will be properly rendered in the child component.

Conclusion

By implementing the above changes, you can successfully pass and manage multiple CSS classes in child components using React and CSS Modules. This technique ensures your components remain flexible and maintainable while offering rich styling options. So, whether you're building a simple app or a complex UI, managing styles dynamically will enhance your development experience.

Now, go ahead and try it out in your React application! Happy coding!