controllers/SkillController.php

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

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

    public function RestData()
    {
        $list = $this->Skill->get_datatables();   //Using CI_Model
        $data = array();
        $no = @$_POST['start'];
        foreach ($list as $res) {

             $no++;
            //Define Button
            $allButton    = "";
            $buttonEdit   = "<button type='button' onclick='get_data(\"".$res->id_skill."\")'>Edit</button>";
            $buttonDelete = "<button type='button' onclick='delete_data(\"".$res->id_skill."\")'>Delete</button>";
            $allButton .= $buttonEdit;
            $allButton .= $buttonDelete;

            $row = array();
            $row[] = $allButton;
            $row[] = $res->nama_keahlian;
            $data[] = $row;
        }

        $output = array(
                    "draw" => @$_POST['draw'],
                    "recordsTotal" => $this->Keahlian->count_all(),
                    "recordsFiltered" => $this->Keahlian->count_filtered(),
                    "data" => $data,
        );
        // output to json format
        echo json_encode($output);
    }
    public function DetailData()
        $req  = $this->input->post();
        $id   =  $req['id_parameter'];
        $data = Skill::where('id_skill', $id)->first();  //Using Eloquent
        echo json_encode(['id' => $data->id_skill, 'skill' => $data->skill_name ]);
    }
}