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Learn how to pass props as classNames to your `Header` component in Next.js and style it dynamically based on the current page.
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How to Change Header Styles Dynamically with Props in Next.js

When building applications with Next.js, you might run into a scenario where you want to change the styling of a component (like a header) based on different pages. This is a common requirement, especially when you want to provide a cohesive yet unique look for different sections of your app.

In this guide, we’ll explore how to pass props as classNames to a Header component and dynamically adjust its background color based on the current page. Let’s dive into the issue at hand and how to effectively solve it!

The Problem

You have a Header component that you want to display across multiple pages in your Next.js application. Your goal is to change the background color of this header based on the current page without affecting the other styles like the tabs below it.

You’ve set up your code with the following structure:

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

However, you are observing that while the className prop is being passed correctly, the styles defined in your CSS module aren’t being applied to the header element. Instead, the header is not receiving its intended styles, leading to confusion and frustration.

Understanding the Issue

The problem arises because Next.js uses CSS modules by default for styling. This means that the class names generated for the CSS file are scoped locally and cannot directly be applied using a regular string reference like "headerBitcoin".

Key Points to Keep in Mind:

CSS Modules Scope: In Next.js, styles defined in CSS modules are scoped, meaning they have unique identifiers that don't conflict with other styles.

Global Styles: If you want to use a class name that isn’t scoped, you’ll need to define it in a global CSS file.

The Solution

To handle this situation correctly, you need to ensure that you're either passing a valid style from your CSS module or using global styles for unscoped classes. Here are the steps to do that:

Step 1: Define Your Header with Scoped Styles

First and foremost, let’s ensure you’re utilizing the styles from your CSS module correctly.

Import your CSS module in your Header component:

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

Update your Header component to use the scoped class name:

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

Step 2: Pass the Class Name Correctly

When using the Header component on different pages, ensure that you are passing the class names correctly corresponding to the defined styles. For example:

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

Step 3: Create a Global Class (if necessary)

If you prefer to use a global class instead of scoped styles for the header, define the headerBitcoin class in a global CSS file, usually located in styles/globals.css. Then, you can simply reference it in the Header without the scoped styles:

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

Then, you can refer to it in your Header like this:

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

Final Thoughts

By following these steps, you can effectively set up your Header component in Next.js to dynamically change its styles based on the current page. Whether you choose to utilize scoped styles through CSS modules or apply global styles, understanding how Next.js handles styling is crucial to building intuitive and visually appealing applications.

Happy coding, and may your headers shine with color!