Is there a way to add a callback to AppWeb.live_view that will run after mount for every LiveView, similar to how on_mount runs before?
I have a really hacky workaround right now that starts a timer in on_mount to check the assigns after a delay.
I’m using Phoenix Live Favicon to set a dynamic Favicon on one of my liveviews (it uses push_event). When the user navigates away from that view, I need to reset the favicon to the default. I found this github issue about creating your own unmount function, but don’t think that would work because that’s after the view and socket are gone. I’m thinking the best way is then to add a callback that will check the assigns and update the favicon appropriately for every LiveView.
That was my previous attempt: always reset in on_mount, sometimes set in mount (or handle_params). My issue with this was the reset and set were merged together and behaved inconsistently, usually resulting in the desired change not happening. I figured calling reset and set in a single load was just a bad practice on my part.
Perfect, thanks! That would simplify the on_mount. Right now I have a large comment before my send(:check_favicon to prevent future me from breaking it during a refactor.
Live favicon could even provide optional on_mount reset callbacks if this feels like a common enough use case (view-specific favicons vs the more programatic ones). Happy to help out if this sounds worthwhile.