Скачать или смотреть Fixing the Blank Screen Issue for Flutter Web on GitHub Pages

Discover how to resolve the `blank screen` issue when deploying a Flutter web app on GitHub Pages with easy, step-by-step instructions.
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This video is based on the question https://stackoverflow.com/q/69884524/ asked by the user 'Tarik Hacialiogullari' ( https://stackoverflow.com/u/4641129/ ) and on the answer https://stackoverflow.com/a/69884525/ provided by the user 'Tarik Hacialiogullari' ( https://stackoverflow.com/u/4641129/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Fixing the Blank Screen Issue for Flutter Web on GitHub Pages

If you're deploying your Flutter web application on GitHub Pages, you might encounter a frustrating problem: a blank screen. This issue typically arises after uploading your build to GitHub Pages, leaving you puzzled and frustrated. In this post, we will dissect the problem and guide you through the solution step-by-step.

Understanding the Problem

When you deploy your Flutter web app to GitHub Pages, you may find that your app displays a blank page. To make matters worse, the console might show error messages that look intimidating, such as:

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

These errors often indicate that certain files, such as the service worker and main.dart.js, could not be found, resulting in a failure to load your app properly. This typically occurs when your app is not served from the root directory of your GitHub Pages; instead, it is located in a subdirectory.

The Solution

The good news is that this issue is fixable! Let's walk through the steps to resolve it.

Step 1: Identify Your Subdirectory

When you deploy on GitHub Pages, your Flutter web project is hosted in a specific directory. For example, your project URL might look like this:

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

Important Note:

This URL indicates that your app is not at the root of GitHub Pages, so we need to adjust the base URL in your HTML files to reflect this subdirectory.

Step 2: Modify the index.html File

Open your index.html file where your Flutter web application is hosted.

Locate line 17 (or the line that contains the <base> tag) in the index.html.

Change the <base> tag as follows:

Before:

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

After:

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

By tweaking this line, you’re effectively telling the browser to look for your files in the correct subdirectory.

Step 3: Verify Your Changes

Once you've made these changes, follow these steps to ensure everything works smoothly:

Re-upload your build: Make sure to upload your updated files back to GitHub Pages.

Clear the cache: Sometimes, the old version of your app gets cached in the browser, so clear your browser cache to view the latest changes.

Visit your URL: Go to your GitHub Pages URL and check if your Flutter app loads correctly without the blank screen.

Conclusion

By understanding how the structure of your app's URL affects its deployment on GitHub Pages, you can effectively fix the blank screen issue when deploying your Flutter web project. By changing the <base> tag in your index.html, you ensure that all resources are correctly loaded from the appropriate path, allowing your app to function as intended.

Now, you're ready to enjoy your fully functional Flutter web app hosted on GitHub Pages. Feel free to share any other challenges you encounter in your development journey, and happy coding!