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claude-memory/graph/code-patterns/foundry-vtt-actorsheetv2-scroll-position-preservation-200593.md
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id type title tags importance confidence created updated
20059335-a27d-4d43-a37c-1bb561c1deaf code_pattern Foundry VTT ActorSheetV2 scroll position preservation
foundryvtt
applicationv2
actorsheetv2
scroll
pattern
javascript
0.8 0.8 2025-12-14T19:12:40.421111+00:00 2025-12-14T19:12:40.421111+00:00

When using ApplicationV2/ActorSheetV2 in Foundry VTT v13, sheet re-renders (triggered by data updates like toggling a boolean) reset scroll position to top. Solution: Override _preRender() to save scroll positions and _onRender() to restore them.

Implementation in base sheet class:

  1. Add this._scrollPositions = {} in constructor
  2. In _preRender(): call this._saveScrollPositions()
  3. In _onRender(): call this._restoreScrollPositions()

_saveScrollPositions() queries scrollable elements (.window-content, .tab-content) and saves their scrollTop values. _restoreScrollPositions() restores those values after render.

Key selectors to save:

  • .window-content (main Foundry window scroll)
  • .tab-content (tab body scroll if using tabbed layout)

This pattern works for any ApplicationV2 subclass, not just actor sheets. File: module/sheets/base-actor-sheet.mjs in vagabond-rpg-foundryvtt project.