JQuery post parameters do not get to my controller

Perhaps put in your config file $config['csrf_protection'] = FALSE;
If its at TRUE, your are in codeigniter userguide a method with CSRF but i don't try it at this day.
link : http://www.codeigniter.com/userguide3/li...token_name

Then, you need to get your data in your controller :

PHP Code:

function create()
{
var_dump($_POST);
$this->form_validation->set_rules('new_loc_loc_name', 'Address', 'required|urldecode'); // tues on your data

if ($this->form_validation->run() == TRUE)
{
    // get your data
    $name = $this->input->post('new_loc_loc_name', TRUE) ; // TRUE for xss_clean
    // call your method
    $this->users_model->filter_create( $name);  // you need to pass your param in your model method and build it for it
}
else
{
$this->load->view('filters/test');
}