Detailed Code Explanation
- Using useEffect for Client-Side Execution: The useEffect hook in MyComponent ensures that the code accessing the document object only runs after the component mounts. This avoids server-side rendering issues, as document is not defined on the server.
- Accessing and Displaying Element Content: Inside the useEffect, document.getElementById(“some-id”) fetches the div element with id=”some-id”. If the element exists, its text content is retrieved and stored in the elementContent state. The content is then displayed inside an h2 tag, allowing dynamic updates based on the element’s content.
- Conditional Rendering: In the Home component, docEnv is set to true only if document is defined, ensuring that MyComponent is only rendered on the client side.’
How to fix “Next.js: document is not defined”?
Next.js is a powerful React framework that allows developers to create server-side rendered (SSR) and static web applications. A common error encountered while working with Next.js is the “document is not defined” error. This error happens because the document is a client-side browser object, which isn’t available during server-side rendering. In this article, we’ll explain why this error occurs and how to fix it.
Table of Content
- When does this error occur?
- Fixing Document not defined
- Detailed Code Explanation
- Best practices to avoid document is not defined error
- Conclusion