Скачать или смотреть Resolving the Issue of document is not defined in Your Google Chrome Extension

Learn how to fix the "Service worker registration failed" and `document is not defined` errors in your Google Chrome Extension with this comprehensive guide.
---
This video is based on the question https://stackoverflow.com/q/72801919/ asked by the user 'Luna McGrove' ( https://stackoverflow.com/u/19443901/ ) and on the answer https://stackoverflow.com/a/72806004/ provided by the user 'Luna McGrove' ( https://stackoverflow.com/u/19443901/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Google Chrome extension "Service worked registration failed" "Uncaught ReferenceError: document is not defined"

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Troubleshooting Google Chrome Extension: document is not defined Error

Are you in the midst of designing a Google Chrome extension but encountering frustrating errors? If you're facing the messages “Service worker registration failed” and “Uncaught ReferenceError: document is not defined,” you’re not alone. Many developers have run into these issues when trying to manipulate a webpage directly from their extensions. In this post, we will break down the problem and provide a clear, step-by-step solution to resolve these errors and get your extension back on track.

Understanding the Problem

When you try to use the document object in a service worker, you will encounter the document is not defined error. This is because service workers run in a different context from web pages; they do not have access to the document or window objects. In other words, you cannot directly manipulate web pages from a service worker.

Errors Explained

Service worker registration failed: This error often indicates issues with your extension's manifest file, particularly in the service worker configuration.

Uncaught ReferenceError: document is not defined: This refers to the fact that you're trying to access the document object in a background script (service worker), where it is not available.

Solution Breakdown

To fix these issues, let’s look at a clear approach to restructuring your code and understanding how to use Chrome extensions effectively.

Step 1: Reassess Your Extension Structure

You want to ensure that your code runs in the right context. Since manipulation of the DOM (Document Object Model) should occur in content scripts or popup scripts (not in the service worker), here’s what to do:

Remove the background.js from being included in your content scripts in the manifest.json file. The service worker does not need to load it.

Step 2: Adjust Your manifest.json File

Update your manifest.json to look like this:

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

Step 3: Creating content.js

Create a new file named content.js to handle the DOM manipulation:

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

This file will run in the context of web pages, allowing you to manipulate the document object directly.

Step 4: Updating the Popup

To manage interactions from the popup, you will need a new JavaScript file, popup.js, linked to popup.html. This file is where you place any code you want to run in the popup page context.

Step 5: Testing Your Changes

After making these changes, reload the extension in Chrome by navigating to chrome://extensions/, enabling "Developer mode," and clicking "Reload" next to your extension.

Check for any remaining errors using the Developer Tools, specifically the console, and make adjustments as necessary.

Conclusion

By following these steps, you can successfully circumvent the document is not defined error by ensuring that you manipulate the DOM in the correct script context. Remember, service workers are powerful but should not be used for DOM manipulation. By segmenting your functionality into content scripts and popup scripts, you will reduce errors and increase the effectiveness of your Google Chrome extension. Happy coding!