How to updating other value apart (qty,subtotal) in cart function codeigniter - php

Question

i'm beginner in codeigniter. i work using cart library from codeigniter and it's work fine. but i have another values as weight and amount (interger value) in my list cart. example when i adding a same value in twice, just qty and subtotal has increased. the weight and amount just update where i Last input not calculate from old value with new value. how i can solved this..?
i'm using CI v3.1 and datatables for show the list cart,
sorry for my bad english language. best regards :)
here my controller cart
//adding to cart list
public function addbarang()
{
$data = array(
'id' => $this->input->post('id_barang'),
'price' => str_replace('.', '', $this->input->post('harga_barang')),
'qty' => $this->input->post('qty'),
'unit' => $this->input->post('j-unit'),
'name' => $this->input->post('nama_barang'),
'nama_jenis' => $this->input->post('j-nama_jenis'),
'id_jenis' => $this->input->post('j-id_jenis'),
'options' => array('j-berat' => $this->input->post('j-weight'),'j-amount' => $this->input->post('j-amount'))
);
$insert = $this->cart->insert($data);
echo json_encode(array("status" => TRUE));
//echo"<pre>";
//print_r($this->cart->contents());
// echo"<pre>";
}
//show cart list in datatables
public function ajax_list_transaksi()
{
$data = array();
$no = 1;
foreach ($this->cart->contents() as $items){
$row = array();
$row[] = $no;
$row[] = $items["id"];
$row[] = $items["name"];
$row[] = $items["id_jenis"];
$row[] = $items["nama_jenis"];
$row[] = $items["qty"];
$row[] = $items["unit"];
$row[] = $items["options"]["j-berat"];
$row[] = $items["options"]["j-amount"];
$row[] = 'Rp. ' . number_format( $items['price'],
0 , '' , '.' ) . ',-';
$row[] = 'Rp. ' . number_format( $items['subtotal'],
0 , '' , '.' ) . ',-';
//add html for action
$row[] = '<a href="javascript:void(0)" style="color:rgb(255,128,128); text-decoration:none" onclick="deletebarang('
."'".$items["rowid"]."'".','."'".$items['subtotal']."'".')"> <i class="fa fa-close"></i> Delete</a>';
$data[] = $row;
$no++;
}
$output = array(
"data" => $data,
);
echo json_encode($output);
}
my js to show and adding value cart list
//the js to show cart list in html
var table;
$(document).ready(function() {
table = $('#table_transaksi').DataTable({
"paging": true,
"ordering": false,
"info": false,
"searching": false,
"processing": true,
"serverSide": true,
"ajax": {
"url": "<?= site_url('Master_rabp/ajax_list_transaksi')?>",
"type": "POST"
},
"columnDefs": [{
"targets": [ 0,1,2,3,4,5,6 ],
"orderable": false,
}],
});
});
function reload_table()
{
table.ajax.reload(null,false);
}
//the js for adding new cart value
function addbarang()
{
var id_barang = $('#id_barang').val();
var qty = $('#qty').val();
if (id_barang == '') {
$('#id_barang').focus();
}else if(qty == ''){
$('#qty').focus();
}else{
$.ajax({
url : "<?= site_url('Master_rabp/addbarang')?>",
type: "POST",
data: $('#form_transaksi').serialize(),
dataType: "JSON",
success: function(data)
{
reload_table();
},
error: function (jqXHR, textStatus, errorThrown)
{
alert('Error adding data');
}
});
$('.reset').val('');
};
}
function deletebarang(id,sub_total)
{
// ajax delete data to database
$.ajax({
url : "<?= site_url('Master_rabp/deletebarang')?>/"+id,
type: "POST",
dataType: "JSON",
success: function(data)
{
reload_table();
},
error: function (jqXHR, textStatus, errorThrown)
{
alert('Error deleting data');
}
});
}