Dynamic Select Dropdowns with CodeIgniter - codeigniter

Question

I'm using CodeIgniter to develop a web application and wondered if anyone could help with a problem that has arose.
I have two dropdowns - Division and Teams. I'm creating a fixture so want to be able to allow the user to choose a division from the first dropdown, then within the second dropdown will only contain the teams from the selected division.
The Code I have so far:
Controller:
function create() {
$data['division_list'] = $this->add_fixture_model->get_divisions();
$data['team_list'] = $this->add_fixture_model->get_teams();
$data['referee_list'] = $this->add_fixture_model->get_referee();
// field name, error message, validation rules
$this->form_validation->set_rules('team_name', 'Team Name', 'trim|required');
$this->form_validation->set_rules('home_team', 'Home Team Name', 'trim|required');
$this->form_validation->set_rules('away_team', 'Away Team Name', 'required');
$this->form_validation->set_rules('division_name', 'Division', 'trim|required');
$this->form_validation->set_rules('referee', 'Referee', 'trim|required');
$this->form_validation->set_rules('fixture_week', 'Fixture Week', 'trim|required');
$this->form_validation->set_rules('fixture_day', 'Fixture Day', 'trim|required');
$this->form_validation->set_rules('fixture_month', 'Fixture Month', 'trim|required');
$this->form_validation->set_rules('fixture_year', 'Fixture Year', 'trim|required');
$this->form_validation->set_rules('confirm_day', 'Fixture Confirm Day', 'trim|required');
$this->form_validation->set_rules('confirm_month', 'Fixture Confirm Month', 'trim|required');
$this->form_validation->set_rules('confirm_year', 'Fixture Confirm Year', 'trim|required');
if($this->form_validation->run() == FALSE)
{
$this->load->view('includes/top');
$this->load->view('includes/header');
$this->load->view('league/add_fixture', $data);
$this->load->view('includes/footer');
}
else
{
if($query = $this->add_fixture_model->add_fixture())
{
$this->load->view('includes/top');
$this->load->view('includes/header');
$this->load->view('league/fixture_added');
$this->load->view('includes/footer');
}
else
{
$this->load->view('includes/top');
$this->load->view('includes/header');
$this->load->view('league/fixture_added', $data);
$this->load->view('includes/footer');
}
}
}
Model:
class Add_fixture_model extends Model {
function add_fixture()
{
$add_new_fixture = array(
'team_name' => $this->input->post('team_name'),
'home_team' => $this->input->post('home_team'),
'away_team' => $this->input->post('away_team'),
'division' => $this->input->post('division_name'),
'ground' => $this->input->post('ground'),
'ground_postcode' => $this->input->post('ground_postcode'),
'referee' => $this->input->post('referee'),
'fixture_week' => $this->input->post('fixture_week'),
'fixture_day' => $this->input->post('fixture_day'),
'fixture_month' => $this->input->post('fixture_month'),
'fixture_year' => $this->input->post('fixture_year'),
'confirm_day' => $this->input->post('confirm_day'),
'confirm_month' => $this->input->post('confirm_month'),
'confirm_year' => $this->input->post('confirm_year')
);
$insert = $this->db->insert('fixtures', $add_new_fixture);
return $insert;
}
function get_divisions()
{
$this->db->from('divisions');
$this->db->order_by('division_name');
$result = $this->db->get();
$return = array();
if($result->num_rows() > 0) {
foreach($result->result_array() as $row) {
$return[''] = 'Select a division';
$return[$row['id']] = $row['division_name'];
}
}
return $return;
}
function get_teams()
{
$this->db->from('teams');
$this->db->order_by('team_name');
$result = $this->db->get();
$return = array();
if($result->num_rows() > 0) {
foreach($result->result_array() as $row) {
$return[''] = 'Select a team';
$return[$row['id']] = $row['team_name'];
}
}
return $return;
}
function list_teams() {
$this->db->from('teams');
$this->db->where('division_id', $this->input->post('id'));
$this->db->order_by('team_name');
$result = $this->db->get();
return $result;
}
function get_referee() {
$this->db->from('referees');
$this->db->order_by('id');
$result = $this->db->get();
$return = array();
if($result->num_rows() > 0) {
foreach($result->result_array() as $row) {
$return[''] = 'Select a referee';
$return[$row['id']] = $row['first_name'].' '.$row['surname'];
}
}
return $return;
}
}
View:
<?php echo form_open('add_fixture/create') ;?>
<label for="division" class="label">Division:</label><?php $js = 'id="division"'; echo form_dropdown('division', $division_list, set_value('division'), $js); ?>
JavaScript:
<script type="text/javascript">
$(document).ready(function() {
$('select#division').change(function() {
var div = $(this).val();
if(div != '') {
$.post("/add_fixture/list_teams/",{division_id: div}, function(data){
$("select#team_name").html(data);
});
}
});
});
</script>
Any help would very much be appreciated :)