title: text field with dropdown in rails
body: <p>I'm trying to build a form field that can either accept a text entry, or select an option from a dropdown.  In rails, the autocomplete plugin is close to what I need, except I want the dropdown to be available before the user types anything in the text field. Is there an example of this out there somewhere?</p>
  
  <p>thx for the help,</p>
  
  <p>-C</p>