Preserve state on hot reload#3896
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…oads When enabled, the renderer records UI-driven prop edits, set_props updates (clientside, serverside and websocket) and memory-type dcc.Store writes as [newVal, originalVal] pairs. Just before a hot reload - soft RELOAD dispatch or full page reload - they are snapshotted (in memory + sessionStorage), then re-applied to the incoming layout unless a prop's initial value changed in the reloaded code, in which case the new code wins. Unmatched edits stay pending so components inserted by callbacks (e.g. pages content) are restored too. The snapshot is only written when a hot reload fires and consumed on use, so a manual browser refresh still resets the app. Off by default; enable with dev_tools_hot_reload_preserve_state=True or DASH_HOT_RELOAD_PRESERVE_STATE=true. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Add dev_tools_hot_reload_preserve_state: keep UI state across hot reloads
When enabled, the renderer records UI-driven prop edits, set_props
updates (clientside, serverside and websocket) and memory-type dcc.Store
writes as [newVal, originalVal] pairs. Just before a hot reload - soft
RELOAD dispatch or full page reload - they are snapshotted (in memory +
sessionStorage), then re-applied to the incoming layout unless a prop's
initial value changed in the reloaded code, in which case the new code
wins. Unmatched edits stay pending so components inserted by callbacks
(e.g. pages content) are restored too. The snapshot is only written when
a hot reload fires and consumed on use, so a manual browser refresh
still resets the app.
Off by default; enable with
dev_tools_hot_reload_preserve_state=TrueorDASH_HOT_RELOAD_PRESERVE_STATE=true.