controller

<?php
defined('BASEPATH') OR exit('No direct script access allowed');
class Disposisi extends CI_Controller
{

  function __construct(){
    parent::__construct();
    $this->load->library('ssp');
    $this->load->model('Model_disposisi');
    $this->load->model('Model_surat_masuk');
    $this->load->model('Model_instansi');
}

  function index(){
    // $info['info'] = $this->db->get_where('tabel_instansi',array ('id_surat'=>$id_surat))->row_array();
    $info['info'] = $this->db->get_where('tabel_instansi',array('id_instansi'=> 1))->row_array();
    $this->load->view('admin/template/a_header', $info);
    $this->load->view('admin/template/a_menu');
    $this->load->view('admin/disposisi/list');
    $this->load->view('admin/template/a_footer', $info);
  }
  function data(){
       // tabel
       $table = 'tabel_surat_masuk';
       // pk
       $primaryKey = 'id_surat';
       $order = 'id_surat';
       $columns = array (
           // field

           array('db' => 'id_surat', 'dt' => 'id_surat'),
           array('db' => 'kode', 'dt' => 'kode'),
           array('db' => 'no_surat', 'dt' => 'no_surat'),
           array('db' => 'isi', 'dt' => 'isi'),
           array('db' => 'asal_surat', 'dt' => 'asal_surat'),
           array('db' => 'tgl_surat', 'dt' => 'tgl_surat'),
           array('db' => 'tgl_diterima', 'dt' => 'tgl_diterima'),
           array('db' => 'file', 'dt' => 'file'),

           array(
               'db' => 'id_surat',
               'dt' => 'aksi',
               'formatter' => function( $d) {
                   //ini ngambil data sesuai id
                   return anchor('disposisi/add/'.$d,'<i class="fa fa-edit"> Disposisi</i>',
                                    'class="btn btn-xs btn-teal tooltips" data-placement="top" data-original-title="Tambah"').'
                                    '.anchor('disposisi/cetak/'.$d,'<i class="fa fa-trash"> Cetak</i>',
                                    'class="btn btn-xs btn-danger tooltips" data-placement="top" data-original-title="Cetak"').'
                                    '.anchor('disposisi/hapus/'.$d,'<i class="fa fa-trash"> Hapus</i>',
                                    'class="btn btn-xs btn-danger tooltips" data-placement="top" data-original-title="Hapus"');
               }
           )
       );

       // supaya library ini dapat mengakses db
       $sql_details = array(
           'user' => $this->db->username,
           'pass' => $this->db->password,
           'db' => $this->db->database,
           'host' => $this->db->hostname
       );

       echo json_encode(
               SSP::simple($_GET, $sql_details, $table, $primaryKey, $columns)
       );
   }

   function add(){
       if (isset($_POST['submit'])){
            // $id_surat = $this->uri->segment(2);
            $this->Model_disposisi->save();
            redirect('disposisi');
       }else {
            $info['info'] = $this->db->get_where('tabel_instansi',array('id_instansi'=> 1))->row_array();
            $info['disposisi'] = $this->db->get_where('tabel_surat_masuk',array('id_surat'=> 1))->row_array();
            $this->load->view('admin/template/a_header', $info);
            $this->load->view('admin/template/a_menu');
            $this->load->view('admin/disposisi/add');
            $this->load->view('admin/template/a_footer', $info);
       }
   }

}