The Filter Widget in Web App Builders has the capability to list values based on a previous expression. This allows the filter to be interactive and user friendly.
For example: A real estate company uses a map to update the availability and price of apartments. It would be convenient for a property manager to filter an apartment/unit based on a community address. To elaborate further, a property manager selects a community and based on this selection, units or apartments belonging to the selected community would show accordingly.