Binder
The pick surface that connects component inputs to page data, live feeds and sheets.
Binding to a spreadsheet cell.
A sheet source shows the grid. Clicking a cell while a slot is armed records the cell in the sheet's bound cells, projects it into data.sheets.<sheetId>.<tab>.<A1>, and binds the slot to that path.
- The bound-cell count on the rail row tells you how much of a sheet is in use.
- Cells that lose their sheet — a deleted tab, a re-import that drops a column — surface as dangling references.
- The projection is read-only: edit values in the Sheets section, never in the Data tab.