The big advantage of drop-down menus related to dynamic lists is that they automatically adapt to the length of the list entries.
As soon as we add an entry, it will be available in the selection. And when we remove an entry, it also disappears just as quickly.
To look forward to the o.g. For example, we would need to refer to, for example, Add another state to create a new table (renamed), and easily include it in the drop-down selection.
To add new cities to existing ones, we extend the table either by:
- Press the TAB key in the last cell of the table.
- By dragging the list at the bottom right (colored reinforced edge) with pressed left mouse button.
Or by a new entry in an empty cell below the table.
(iD.R., the table is automatically expanded here, and a query appears if so desired.)
Of course, this procedure of the dependent drop-down lists can be continued.
So we could next, for example, depending on the city, still on the municipalities, and then on street directories continue to filter.