How to support offline CRUD operations using Blazor PWA
Hey everyone! I'm working on building a Blazor PWA that supports offline functionality and CRUD operations, and I could really use your help.
Specifically, I'm looking to leverage IndexedDB for offline data storage and syncing with the server when the internet is available again. The goal is to make the app installable on user devices and fully functional even when they don't have an internet connection.
I want to make sure I'm applying best practices and caching strategies to provide a seamless offline experience for users. If anyone has experience with this or can share any resources, demos, or articles that could help guide me, I'd be absolutely thrilled.
Some of the key things I'm looking to learn more about are:
- Implementing offline data storage and sync with IndexedDB in Blazor
- Caching strategies for Blazor PWAs to provide a great offline experience
- Best practices for handling network connectivity changes and conflict resolution
- Leveraging the Blazor ServiceWorkerInterop for offline functionality
If you have any insights or examples to share, I would greatly appreciate it. I'm really excited to build this PWA and make it work flawlessly both online and offline. Thanks in advance for your help!
1 Reply
I'm currently working on resolving connectivity issues in my project. What api are you using? REST or GRPC? I'm using the latter in my case, and when the client attempts to send a request to a non-reachable server an exception is thrown.
Thus, I can catch it, and by, e.g., verifying whether the server's health check endpoint is accessible, I can determine whether there is a connectivity issue.
In your case, from this point you can switch to offline mode, notify the user of the change, and start a background process that occasionally checks for a restored connection (
unless it is enforced by the user, via some offline mode setting)
Not familiar with browser caching best practices, all I can say is that you probably don't want to store this in the cookies cache lol
For conflict resolution you can use a timestamp. When a conflict is discovered, the user is prompted to decide whether to keep local changes (overwrite server) or load server state (override local)