Related Value Lists

Related Value Lists are a very powerful technique. Each time the user makes a selection, it filters the next selection down so that the user can only ever select a valid option. In other words, it lets users drill down until they get to where they want. For example, select a State and only see the Cities in that State. Select a City and see all the people living in that city and all the zip codes for it. Select a Zip Code and see all the people lving in that zip code. Related value lists can be simple or complex but they are enomously powerful and a lot of fun to build.