rmaps-online/backlog/tasks/task-4 - PWA-offline-support.md

id	title	status	assignee	created_date	updated_date	labels	dependencies	priority
task-4	PWA offline support	In Progress		2025-12-15 19:37	2026-01-02 14:28			high

Description

Implement service worker for offline caching. Store map tiles, venue data, and room state in IndexedDB. Sync when reconnected.

Implementation Notes

Partial Implementation

PWA basics implemented:

1. Service Worker (public/sw.js)

   • Push notification handling
   • Location request messaging
   • Basic caching setup

2. Install Banner (src/components/room/InstallBanner.tsx)

   • Detects installable PWA state
   • Shows "Add to Home Screen" prompt
   • iOS-specific instructions
   • Dismissible with localStorage persistence

3. PWA Manifest - App manifest with icons and theme colors

Still Needed

• Offline map tile caching (IndexedDB)
• Room state persistence for offline viewing
• Sync queue for offline location updates
• Background sync when reconnected