masalah function hitung jquery bag 2

//controller Admin.php
<?php
defined('BASEPATH') OR exit ('No direct script access allowed');

/**
*
*/
class admin extends CI_Controller {

    public function __construct()
    {
        parent::__construct();
        $this->load->model('kuale');
    }

    public function index()
    {
        $data['data'] = $this->kuale->selectAll('tb_menu')->
        result_object();


        //$this->load->view('admin/header');
        $this->load->view('admin/data', $data);
        //$this->load->view('admin/footer');

    }

    public function upload()
    {
        $this->load->view('admin/upload');
    }

    public function aupload()
    {
        $config['upload_path'] = './img/';
        $config['allowed_types'] = 'gif|jpg|png';
        $config['max_size']  = '10000';
        $config['max_width']  = '5000';
        $config['max_height']  = '5000';

        $this->load->library('upload', $config);

        if ( ! $this->upload->do_upload()){
            echo "Upload Gagal";


        }
        else{
            $img = $this->upload->data();
            $foto = $img['file_name'];
            $data = array('nama_menu' => $this->input->post('nama_menu'),
                      'harga' => $this->input->post('harga'),
                      'kategori' => $this->input->post('kategori'),
                      'foto' => $foto);


        $query = $this->kuale->insert('tb_menu',$data);
        redirect('admin/index','refresh');


                }
    }

    public function edit($id_menu)
    {
        $data['r'] = $this->kuale->select('tb_menu', array('id_menu'
                   => $id_menu))->row();
        $this->data['kuale'] = $this->db->get('tb_menu')->result_array();
        $this->load->view('admin/edit', $data);

    }

    public function aedit()
    {

        $config['upload_path'] = './img/';
        $config['allowed_types'] = 'gif|jpg|png';
        $config['max_size']  = '10000';
        $config['max_width']  = '5000';
        $config['max_height']  = '5000';

        $this->load->library('upload', $config);

        if ( ! $this->upload->do_upload()){
            echo "Upload Gagal";


        }
        else{
            $img = $this->upload->data();
            $foto = $img['file_name'];
            $id_menu = array('id_menu' => $this->input->post('id_menua'));
            $data = array('nama_menu' => $this->input->post('nama_menu'),
                      'harga' => $this->input->post('harga'),
                      'kategori' => $this->input->post('kategori'),
                      'foto' => $foto);

         $query = $this->kuale->update('tb_menu',$data,$id_menu);
        redirect('admin/index','refresh');

    }}

    public function hapus($id)
    {
        $data = array('id_menu' => $id);
        $query = $this->kuale->delete('tb_menu',$data);
        redirect('admin/index','refresh');
    }

    public function pelayan()
    {
        $data['data'] = $this->kuale->selectAll('tb_pesanan') ->
        result_object();


        //$this->load->view('admin/header');
        $this->load->view('admin/pelayan2',$data);
        //$this->load->view('admin/footer');
    }


    public function logout()
    {
        $this->session->sess_destroy();
        redirect('user/index', $data);
    }
    public function pesan()
    {
         $data['detail'] = $this->kuale->getmenu();
         $data['sumjumlah'] = $this->kuale->getsum();
         //$data['detail'] = $this->kuale->selectAll('tb_detail_pesanan')->
        //result_object();
        $data['data'] = $this->kuale->selectAll('tb_menu')->
        result_object();
        $this->load->view('admin/tpesan', $data);



                        /*$data = array('makanan' => $this->input->post('makanan'),
                      'harga_makanan' => $this->input->post('harga_makanan'));

                       $query = $this->kuale->insert('tb_pesanan', $data);
                       redirect('admin/pelayan','refresh');*/
    }

    public function apesan()
    {

        $data = array('id_detail_pesanan' => $this->input->post('id_detail_pesanan'),
                      'id_menu' => $this->input->post('id_menu'),
                      'nama_pesanan' => $this->input->post('nama_pesanan'),
                      'harga_satuan' => $this->input->post('harga_satuan'),
                      'jml_porsi' => $this->input->post('jml_porsi'),
                      'subtotal' => $this->input->post('subtotal'));
        $query = $this->kuale->insert('tb_detail_pesanan',$data);

        redirect('admin/pesan');
        /*$data = array('minuman' => $this->input->post('minuman'),
                      'harga_minuman' => $this->input->post('harga_minuman'));

                       $query = $this->db->query('insert tb_pesanan into (no_meja ,minuman, harga_minuman)
                        select minuman, harga_minuman from tb_minuman');*/
    }

    public function opesan()
    {
        $data = array('id_pesanan' => $this->input->post('idpesanan'),
                      'no_meja' => $this->input->post('no_meja'),
                      'tgl_pesan' => $this->input->post('tgl_pesan'),
                      'total' => $this->input->post('total'));
        $query = $this->kuale->insert('tb_pesanan', $data);

        redirect('admin/pelayan','refresh');
    }

    public function hapus2($id)
    {
        $data = array('id_menu' => $id);
        $query = $this->kuale->delete('tb_detail_pesanan',$data);
        redirect('admin/pesan');
    }


    public function kasir()
    {
        $data['data'] = $this->kuale->selectAll('tb_order') ->
        result_object();
        //$this->load->view('admin/header');
        $this->load->view('admin/kasir', $data);
        //$this->load->view('admin/footer');*/
    }





}

/* End of file Admin.php */
/* Location: ./application/controllers/Admin.php */

//model kuale.php
<?php
defined('BASEPATH') OR exit('No direct script access allowed');

class Kuale extends CI_Model {

    public function select($tabel,$where)
    {
        return $query = $this->db->get_where($tabel, $where);
    }

    public function selectAll($tabel)
    {
        return $query = $this->db->get($tabel);
    }

    public function update($tabel,$data,$where)
    {
        return $query = $this->db->update($tabel, $data, $where);
    }

    public function delete($tabel,$where)
    {
        return $query = $this->db->delete($tabel, $where);
    }
    public function insert($tabel,$data)
    {
        return $query =$this->db->insert($tabel, $data);
    }

    public function proseslogin($username,$password)
    {
        $this->db->where('username', $username);
        $this->db->where('password', $password);
        return $this->db->get('user')->row();
    }
    public function getmenu()
    {
        $sql = "SELECT id_menu, nama_pesanan, harga_satuan, jml_porsi, (harga_satuan * jml_porsi) as subtotal FROM tb_detail_pesanan ORDER BY id_detail_pesanan ";
        return $this->db->query($sql);
    }
    public function getsum()
    {
        $this->db->select_sum('subtotal', 'total');
        $this->db->from('tb_detail_pesanan');
        return $this->db->get('')->row();
    }
}

/* End of file kuale.php */
/* Location: ./application/models/kuale.php */

//view tpesan.php