ValueError: Cannot set event handler for unknown event

[stucork]

here’s the library from @owen.campbell that seems like it might be just what you’re looking for:

Publish-Subscribe Messaging

Having written my thoughts on the subject in What's everyone building?, it seemed a shame not to just write the code! Here’s my first attempt at a pub-sub implementation for Anvil apps:

If you’re using an event that you haven’t defined as part of the CustomComponent or you want to create a custom event for an arbitrary Component use x-validating instead of validating

linked docs: Anvil Docs | Anvil Components