Codeigniter: Interdependent dropdown lists. Completed code - codeigniter

Question

I have a series of interdependent select lists which work correctly outside CI. When I tried to implement it in Codeigniter, I am not coming on as the first selectlist is not populated, either the echoing is not properly code or I dont know what. This question here will refer to just the first select list, that is, you will not see any jquery, because the first gets populated directly from the database without any "function change".
so here are the modules:
VIEW
<?php echo form_open('control_form/add_all'); ?>
<label for="f_state">State<span class="red">*</span></label>
<select id="f_state" name="f_state">
<option value=""></option>
<?php
foreach($result as $row)
{
echo '<option value="' . $row->pais_id . '">' . $row->pais_name . '</option>';
}
?>
</select>
<label for="f_city">City<span class="red">*</span></label>
<!--this will be filled based on the tree selection above-->
<select id="f_city" name="f_city" id="f_city_label">
<option value=""></option>
</select>
<label for="f_membername">Member Name<span class="red">*</span></label>
<input type="text" name="f_membername"/>
<?php echo form_close(); ?>
CONTROL
public function add_all()
{
#Validate entry form information
$this->load->model('model_form','', TRUE);
$this->form_validation->set_rules('f_state', 'State', 'required');
$this->form_validation->set_rules('f_city', 'City', 'required');
$this->form_validation->set_rules('f_membername', 'Member Name', 'required');
$data['city'] = $this->model_form->get_state(); //gets the available groups for the dropdown
if ($this->form_validation->run() == FALSE)
{
$this->load->view('view_form_all', $data); # parece ser que vuelve a meter los mismos datos que tenia la Form
}
else
{
#Add Member to Database
$this->model_form->add_all();
$this->load->view('view_form_success');
}
}
MODEL
<?php
class Model_form extends CI_Model
{
function __construct()
{
// Call the Model constructor
parent::__construct();
}
function get_state()
{
$query = $this->db->query('SELECT pais_id, pais_name FROM pais');
return $query->result();
}
function add_all()
{
$v_state = $this->input->post('f_state');
$v_membername = $this->input->post('f_membername');
$data = array(
'pais_id' => NULL,
'pais_name' => $v_state
);
$this->db->insert('members', $data);
}
}

Answer 1

You are not sending $result to the view, you need something like:
$data['result'] = ...//get some data
$this->load->view('view_form_all',$data);
If the list you want to display is the cities list, then you need to change in your view:
foreach($city as $row)
{
echo '<option value="' . $row->pais_id . '">' . $row->pais_name . '</option>';
}
since in your controller you are doing:
$data['city'] = $this->model_form->get_state();