Fix Excel Office.js Add-In Failing on Firebase Hosting
Question details
The user needs to resolve an issue where an Excel Office.js add-in built with Flutter Web works on localhost but fails to import an Excel template after deployment to Firebase Hosting.
- Product
- Excel Office.js Add-In
- Device & OS
- not provided
- Scenario
- Deploying a Flutter Web-based Excel add-in to production via Firebase Hosting and attempting to import a template file.
- Observed behavior
- The add-in functions correctly locally but fails to locate or import the Excel template when running from the deployed Firebase Hosting URL.
Verify that your Firebase Hosting deployment completed successfully without errors and that your deployed URL is accessible in a standard web browser.
Move the Excel Template to the Flutter Web Directory
Ensure the Excel template file is placed in the correct directory so it is properly bundled and served by Firebase Hosting as a static file.
When deploying a Flutter Web app, files located only in the standard assets folder might not be exposed correctly for direct external URL access. Office.js requires direct access to the template file, which is best achieved by placing it in the web root directory.
Find your Excel template file inside your Flutter project workspace.
Drag or copy the template file directly into the 'web' folder of your Flutter project directory.
Update your Dart code to reference the new path relative to the web root instead of the assets directory.
Run 'flutter build web' in your terminal, then redeploy your application to Firebase Hosting.
Check Firebase Hosting Rules and URL Accessibility
Verify that Firebase Hosting rules are not blocking access to the template file and that the URL is publicly reachable.
Try WPS Office for Seamless Spreadsheet Management
While troubleshooting Firebase deployment issues for Microsoft Office.js, consider WPS Office as a lightweight, highly compatible alternative for managing your spreadsheets and templates. WPS Office offers robust spreadsheet functionality, seamless Microsoft Excel format compatibility, and a smooth user experience.
- 1. Download WPS Office: Visit the official WPS Office website and download the free installer for your operating system.
- 2. Install the Software: Run the installer and follow the on-screen instructions to complete the setup.
- 3. Open Your Templates: Launch WPS Spreadsheets to seamlessly open, edit, and manage your .xlsx template files.
Frequently Asked Questions
Why do files in the Flutter assets folder fail to load in Office.js on Firebase?
Flutter processes the assets folder specifically for internal app usage and rendering. When deployed to Firebase, external libraries like Office.js often need direct static URL access, which is better handled by placing the files in the 'web' directory.
How can I test my deployed Office.js add-in on production?
Sideload your add-in's manifest file in Excel, ensuring you have updated the SourceLocation URL in the manifest XML to point to your live Firebase Hosting domain instead of localhost.
Where can I get more help for Microsoft Office.js development?
The best places to seek specialized help are the Office Development section on Microsoft Q&A or by tagging your development questions with 'office-js' on Stack Overflow.
