Identifying when an element is in or out of view using Next.js and TypeScript

I'm currently working on an app using Next and Typescript. The app features a navigation bar at the top of the screen, and I need it to change its style once it reaches a certain point in the view. I attempted to use jQuery for this purpose, but encountered issues with window being undefined during development mode, as well as quirky interactions between Typescript and jQuery. Here is a snippet of the code:

const Home: NextPage = () => {
  return (
    <>
      <nav id="myNav">
        <ul>
          <li>Item 1</li>
          <li>Item 2</li>
          <li>Item 3</li>
        </ul>
      </nav>
      <main>
        <div id="firstDiv">
         {//more code}
        </div>
        <div id="divToHideNav">
         {//more code}
        </div>
      </main>
    </>
  );
};

export default Home;

Is there a way to alter the navigation style when it reaches the second div? I'm open to any solution, whether or not it involves jQuery. Thank you in advance!

Answer №1

To update the style as you scroll through a page, consider utilizing the Intersection Observer API along with its polyfill for compatibility with Internet Explorer. This approach will provide the desired functionality. Check out more information on this at developer.mozilla.org/en-US/docs/Web/API/…

One important detail to note is that when creating an isomorphic app, the window and document objects are undefined on the server-side. Therefore, ensure to execute your intersection observer callback within a useEffect or useLayoutEffect hook.

If you need additional guidance, there is a tutorial available on YouTube that appears to cover the topic thoroughly: youtube.com/watch?v=QD4GcZJObXg

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