我想我这样做是成功的。
1.我创建了一个函数来获取模型中的数据：

public function get_jenis_pekerjaan(){
        return $this->db->get('jenis_pekerjaan');
    }

1.我在控制器中调用了该函数：

public function create_lowongan(){
        $data['jenis_pekerjaan'] = $this->m_lowongan->get_jenis_pekerjaan()->result();
        $this->load->view('create_lowongan', $data);
    }

1.我在store函数中添加$data_jp来存储jenis_pekerjaan的值：

public function store_lowongan(){
        $data_jp['jenis_pekerjaan'] = $this->m_lowongan->get_jenis_pekerjaan();
        $user_name          = $this->session->userdata('name');
        $title              = $this->input->post('title');
        $lokasi             = $this->input->post('lokasi');
        $level_pekerja      = $this->input->post('jenis_pekerjaan');
        $pengalaman_kerja   = $this->input->post('pengalaman_kerja');
        $pendidikan         = $this->input->post('pendidikan');
        $alamat             = $this->input->post('alamat');
        $no_wa              = $this->input->post('no_wa');
        $no_telp            = $this->input->post('no_telp');
        $min_gaji           = $this->input->post('min_gaji');
        $max_gaji           = $this->input->post('max_gaji');
        $job_desc           = $this->input->post('job_desc');
        $created_at         = date('y-m-d');
        $status             = 'draft';

        $data = array(
            'user_name'         => $user_name,
            'title'             => $title,
            'lokasi'            => $lokasi,
            'level_pekerja'     => $level_pekerja,
            'pengalaman_kerja'  => $pengalaman_kerja,
            'pendidikan'        => $pendidikan,
            'alamat'            => $alamat,
            'no_wa'             => $no_wa,
            'no_telp'           => $no_telp,
            'min_gaji'          => $min_gaji,
            'max_gaji'          => $max_gaji,
            'job_desc'          => $job_desc,
            'created_at'        => $created_at,
            'status'            => $status,
        );

        $this->m_lowongan->input_data($data, 'lowongan');
        redirect ('dashboard');
    }

1.我编辑视图，使其看起来像这样的动态下拉列表：

<tr>
                            <td>Level Pekerjaan</td>
                            <td>
                                <select name="jenis_pekerjaan" id="jenis_pekerjaan" class="form-control">
                                  <?php foreach($jenis_pekerjaan as $l) {?>
                                    <option value="<?php echo $l->job_type?>"><?php echo $l->job_type?></option>
                                  <?php }?>
                                </select>
                            </td>
                        </tr>

它工作正常，显示jenis_pekerjaan表中的值，并将数据存储到数据库中：D