Input type submit won't trigger when it's clicked - codeigniter

Question

I have trouble with my code, I want to create an upload button to upload my .xlsx file, but it won't trigger even when I try to click it.
My view.php :
<form action="<?php echo base_url("index.php/fin/cost_control/workingcanvas/import"); ?>" method="post" id="import_form" enctype="multipart/form-data">
<p><label>Pilih File Excel</label>
<input type="file" name="file" id="file" required accept=".xls, .xlsx" /></p>
<br />
<input type="submit" id="import" name="import" value="Import" class="btn btn-info" />
</form>
My controller:
public function import(){
include APPPATH.'third_party/PHPExcel/PHPExcel.php';
$excelreader = new PHPExcel_Reader_Excel2007();
$loadexcel = $excelreader->load('excel/'.$this->filename.'.xlsx');
$sheet = $loadexcel->getActiveSheet()->toArray(null, true, true ,true);
$numrow = 1;
foreach($sheet as $row){
if($numrow > 1){
array_push($data, array(
'nis'=>$row['A'],
'nama'=>$row['B'],
'jenis_kelamin'=>$row['C'],
'alamat'=>$row['D'],
));
}
$numrow++;
}
$this->SiswaModel->insert_multiple($data);
redirect("Siswa");
}
and my model:
public function insert_multiple($data){
$this->db->insert_batch('siswa', $data);
}
I've tried with adding some part on autoload such as
$autoload['helper'] = array('url','form','file');
Any suggestions or advice? Thanks.

Answer 1

first load form helper in autoload file of codeigniter or load manually
$autoload['helper'] = array('url'); // autoload
$this->load->helper->('form'); // manually loading form helper
you better use this
$attributes = array('enctype' => 'multipart/form-data');
echo form_open('index.php/fin/cost_control/workingcanvas/import', $attributes);
<your upload form code>
<?php echo form_close(); ?>
instead of tags
more info: https://codeigniter.com/user_guide/helpers/form_helper.html