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Page on_unload lifecycle hook #6233
Description
Summary
Add an on_unload lifecycle hook for page unload events — the inverse of on_connect (1j).
Details
Fires when a user navigates away from a page or closes the tab, enabling cleanup logic and resource release. This completes the connection lifecycle: on_connect for setup, on_unload for teardown.
Part of the Reflex Framework Roadmap — Section 1m.
Activity
linear commentedon Mar 25, 2026
ENG-9172
masenf commentedon Mar 25, 2026
Closing this as not planned — the semantics of
on_unloadare too vague to implement well.Key questions that don't have clear answers:
on_unloadfire? When the state expires? When the request completes?An alternative like
on_expire(firing when the state is evicted from the backing store) was considered, but that also has problems — for Redis-backed state, we don't know the state expired until after it's already gone, so there's no opportunity to run a handler.Recommending closure as not planned.