Скачать или смотреть Integrating Next.js into Your Existing HTML: Rendering Just the Nextjs_div

Discover how to use `Next.js` to render a specific part of an HTML page without overwriting the entire document structure. Learn the essential steps to integrate a single component seamlessly.
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Integrating Next.js into Your Existing HTML

When working with web applications, you might find yourself needing to integrate a modern framework with existing HTML structures. One common scenario is the desire to use Next.js for just a specific section of your website without it replacing the entire HTML page. This article will guide you through the process of achieving that by rendering only a designated div element from Next.js, providing a smooth blend with your existing elements.

The Challenge

The challenge at hand is straightforward: You want a specific part of your webpage — a div with the ID nextjs_div — to be powered by Next.js, while the rest of your website, including elements like a pre-existing navbar, remains intact and untouched. However, Next.js typically renders a full HTML page, complete with its own head and body components. Consequently, you can't simply drop a snippet of Next.js into your existing HTML and expect it to work directly.

Two Possible Use Cases

When considering how to integrate Next.js, you'll identify two primary use cases:

Using Next.js as a Templating/Component Framework - You can utilize it to create partial HTML documents with JSX and server-side rendering.

Using Next.js as a React Server - This approach will allow for the creation of reactive partial HTML documents on the client-side.

Use Case 1: Templating/Component Framework

This approach is achievable but not strictly supported by Next.js. It can get a bit hacky, and it might not be the best route to take if you're looking for a long-term solution. However, whatever method you decide on, be aware of its limitations.

Use Case 2: React Server with Client-Side Reactivity

This approach is more robust and involves rendering partial HTML documents using Next.js API handlers and employing renderToStaticMarkup or renderToString. The key to this use case lies in integrating a functioning React component within a specified div.

Implementation Steps

To render partial HTML using Next.js, follow these steps, and customize according to your needs:

Step 1: Set Up Your API Route

Create a new API route to handle rendering your HTML component. Below is a sample implementation to get you started.

File: ./src/pages/test.tsx

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

Step 2: Replace renderToStaticMarkup

Initially, you may want to work with renderToStaticMarkup, but as you get comfortable, consider switching to renderToString for React hydration. While doing this, ensure you're familiar with how Next.js manages client-side rendering so that your integration remains functional.

Step 3: Test Your Integration

Once you've set up your API route, you can test the endpoint to confirm that it returns the intended HTML. Afterward, you can replace the Test content with any dynamic content or components you require.

Conclusion

Integrating Next.js into an existing HTML structure may seem challenging at first. However, with the right approach and understanding of the framework's capabilities, you can seamlessly render specific components without completely overwriting your HTML page. Whether you choose to work with it as a templating framework or a React server, understanding how to work with API routes is key to your success.

If possible, consider evaluating if purely using React (without Next.js) could meet your needs more effectively. Nevertheless, with the above guide, you'll be equipped to blend Next.js into your project successfully.