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The Ultimate Guide to Implementing Multi-Level Routes in Next.js Navigation

Welcome back to Part Two of our NextJS navigation tutorial! In the previous video, we explored straightforward navigation using the link button and router in NextJS. However, we discovered that when it comes to scenarios where we need to pass additional parameters, such as a department number or a course number, the current page routing method falls short. In this blog post, we will delve into how to create multi-level routes using NextJS.

Folder Structure

The first step in creating multi-level routes is to restructure our folder organization. We need to create a folder for departments and another folder for courses. Within the departments folder, we will create a subfolder for each department ID. Similarly, within the courses folder, we will create a subfolder for each course ID. This new folder structure will allow us to create nested routes and access specific department or course content.

Routing Setup

Now that we have our folder structure in place, we need to move the appropriate files into their respective folders. The courses should be moved into the course ID subfolder, and the departments should be moved into the department ID subfolder. This reorganization ensures that our routes will work correctly.

However, simply moving the files is not enough. In order for the routes to function properly, we need to rename the files to "index.tsx" within each subfolder. For example, within the course ID subfolder, the file name should be "index.tsx". This naming convention allows NextJS to understand the nested routing structure and render the correct content.

Testing the Routes

Now that we have set up our multi-level routes, let's test them to ensure they are working as expected. If we navigate to a specific department using the department ID, we should see the corresponding department content rendered. Similarly, if we navigate to a specific course using the course ID, we should see the relevant course content.

However, at this stage, you may encounter an issue where accessing the courses or departments directly does not work. To address this, we need to create an additional "index.tsx" file at the top level of the departments and courses folders. These index files will serve as the entry points for the departments and courses, allowing us to navigate to the main department and course content.

Nested Routing

Now that we have successfully set up the second level of routing, let's take it a step further and introduce nested routing. In this scenario, we want to navigate to specific departments and within each department, there will be multiple courses, each with its own course ID. To make this work, we need to nest the courses folder inside the department ID folder.

By nesting the courses folder within the department ID folder, we can ensure that when we navigate to a specific department, we can access the corresponding courses and their respective course IDs. This nesting structure allows us to achieve the desired multi-level routing.

Conclusion

In this blog post, we explored the process of creating multi-level routes in NextJS. We learned that by restructuring our folder organization and renaming files to "index.tsx" within each subfolder, we can achieve nested routing and access specific department and course content. Additionally, we discovered the importance of the top-level "index.tsx" files for navigating to the main department and course content. In the next video, we will dive into how to retrieve routing parameters like department and course IDs in our components. Stay tuned!

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