controller

<?php  if (!defined('BASEPATH')) exit('No direct script access allowed');

class Autocomplete extends CI_Controller {


	  public function __construct()
	{
		parent::__construct();
		$this->load->model("Mautocomplete");
		$this->load->library('form_validation');
	}
	public function index()
	{

	 $data['listKategori'] = $this->kategori_model->getAllKategori();
      $header = array(
         'title'     =>'Welcome to my Website'
      );
      $content = array(
         'article'   =>'Lorem Ipsum Dolor Sit Amet'
      );
      $data['data_to_load'] = array($header,$content);

	  $data['tmp_file']='pembelian/input';
      $this->load->view('index',$data);
   }

	function lookup(){
		// process posted form data (the requested items like province)
        $keyword = $this->input->post('term');
        $data['response'] = 'false'; //Set default response
			$query = $this->MAutocomplete->lookup($keyword); //Search DB
        if( ! empty($query) )
        {
            $data['response'] = 'true'; //Set response
            $data['message'] = array(); //Create array
            foreach( $query as $row )
            {
                $data['message'][] = array(
                                        'id_suplier'=>$row->id_suplier,
                                        'value' => $row->nama,
                                        ''
                                     );  //Add a row to array
            }
        }
        if('IS_AJAX')
        {
            echo json_encode($data); //echo json string if ajax request

        }
        else
        {
             $header = array(
				'title'     =>'Welcome to my Website'
					);
					$content = array(
					'article'   =>'Lorem Ipsum Dolor Sit Amet'
					);
				$data['data_to_load'] = array($header,$content);

				$data['tmp_file']='pembelian/input';
				$this->load->view('index',$data);
        }
	}

}