jQuery UI AutoComplete: Only allow selected valued from suggested list

Question

I am implementing jQuery UI Autocomplete and am wondering if there is any way to only allow a selection from the suggested results that are

Answer 1

This is how I did it with a list of settlements:

 $("#settlement").autocomplete({
  source:settlements,
  change: function( event, ui ) {
  val = $(this).val();
  exists = $.inArray(val,settlements);
  if (exists<0) {
    $(this).val("");
    return false;
  }
 }
});