opened
EmTee70
username_0
If you put a html id into the form tag, with 
form_tag({:action => 'your_action'}, method: 'get', id: 'formid')
you can get the submit on select behavior simply by:

$('#your_field').bind('railsAutocomplete.select', function(event, data){
  /* Do something here */
  /* alert(data.item.id); */
  $('#formid').submit();
 
});
Update the Docs with an additional / better  Example ?
issue