title: Dropdown list with autocomplete and instant results
body: <p>I want to create a dropdown list with autocomplete.
  The list will contain districts from a country, and when a user selects a certain district, he should be able to see right away a list of other members from that district, and some data about them, from the database.</p>
  
  <p>Once the district has been selected, the results should always be shown on the page, even in new sessions, until the user changes his settings.</p>
  
  <p>What would be the simplest or the most efficient solution for this?
  Thanks.</p>