javascript - Data not inserted using modal bootstrap and codeigniter

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I'm not familiar using javascript & jquery in modal bootstrap, and need your advice.
I create a modal to insert data into database. but when i click 'save' button nothing happen.
I hope you can help me to check if there's something wrong with my codes. I spent a weeks searching if there any error in my codes.

Here is my view :

$(document).on("click", ".open-InputNilaiDialog", function () 
		var myFormId = $(this).data('id');
		$(".modal-body #nim").val( myFormId );
	);

<div class="modal fade" id="inputNilaiDialog" role="dialog" >
 <div class="modal-dialog">
 <div class="modal-content">
 <div class="modal-header">
 <button type="button" class="close" data-dismiss="modal" aria-label="Close">
 <span aria-hidden="true">&times;</span></button>
 <h4 class="modal-title">Form Nilai</h4>
 </div>
 <div class="modal-body">
 <p>Contoh</p>
			<form class="form-horizontal" method="post" action="<?php echo base_url().'tutor/mtk_np/simpan'?>">
 <div class="box-body">
			 <div class="form-group">
 <div class="col-sm-10">
					<input type="hidden" class="form-control" id="idtutor" name="idtutor" value="<?php echo $this->session->userdata('username'); ?>"/>
 </div>
 </div>
				<div class="form-group">
 <label for="nim" class="col-sm-2 control-label">NIM</label>

 <div class="col-sm-10">
 <input type="text" class="form-control" id="nim" name="nim" readonly />
 </div>				 
 </div>	
 <div class="form-group">
 <label for="nilai" class="col-sm-2 control-label">Nilai</label>

 <div class="col-sm-10">
 <input type="text" class="form-control" id="nilai" name="nilai" readonly />
 </div>				 
 </div>	
				
				<!-- START INPUT HIDDEN-->
				<input type="hidden" class="form-control" id="kd_mtk" name="kd_mtk" value="<?php echo $row->kode_mtk; ?>"/>
				<input type="hidden" class="form-control" id="kelas" name="kelas" value="<?php echo $row->kelas; ?>"/>
				<!-- END INPUT HIDDEN-->
 <div class="modal-footer">
 <button type="button" class="btn btn-default pull-left" data-dismiss="modal">Tutup</button>
 <button type="button" class="btn btn-primary">Simpan</button>
 </div>
			 </form>
			 </div>
 </div> 
 </div> 
		</div>

This is my controller :

public function simpan()
$data = array (
'idtutor' => $this->input->post('idtutor'),
'nim' => $this->input->post('nim'), 
'kd_mtk' => $this->input->post('kd_mtk'),
'kelas' => $this->input->post('kelas'),
'nilai' => $this->input->post('nilai')
);
$this->mtk_model->simpan($data);
redirect(base_url(). "mtk_np");

And my model :

function simpan($data)

 $this->db->insert("nilai_tutorial", $data); 

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