Hướng dẫn auto sum javascript - javascript tổng hợp tự động

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           if($_GET['mod'] == 'Buat Surat Jalan Keluar'){
        function romanNumerals($num) 
{
    $n = intval($num);
    $res = '';

    /*** roman_numerals array  ***/
    $roman_numerals = array(
                'M'  => 1000,
                'CM' => 900,
                'D'  => 500,
                'CD' => 400,
                'C'  => 100,
                'XC' => 90,
                'L'  => 50,
                'XL' => 40,
                'X'  => 10,
                'IX' => 9,
                'V'  => 5,
                'IV' => 4,
                'I'  => 1);

    foreach ($roman_numerals as $roman => $number) 
    {
        /*** divide to get  matches ***/
        $matches = intval($n / $number);

        /*** assign the roman char * $matches ***/
        $res .= str_repeat($roman, $matches);

        /*** substract from the number ***/
        $n = $n % $number;
    }

    /*** return the res ***/
    return $res;
    }




echo"";
echo"


";
$month = date('n');
$b=romanNumerals($month);
$years=date('Y');
echo"
";
$tanggal=date('d');
$s=mysql_query("SELECT * FROM surat_jalan WHERE identitas_surat = 1 AND bulantahun=$_POST[bulantahun] ORDER BY no_surat_jalan ASC");
while($a=mysql_fetch_array($s)){
$nomor = $a[2];
$potong = (int)substr($nomor,0,3);
$potong++;
}
$kosong= mysql_num_rows($s);
if(count($kosong) == 0){
$nomore = sprintf('%03s',1);
}
else {
$nomore = sprintf('%03s',$potong);
}
echo"






No : ".$nomore."/$b/$years







Customer
";
$s=mysql_query('SELECT * FROM customer ORDER BY nama_customer ASC');
while($ben=mysql_fetch_array($s)){
echo"$ben[nama_customer]";
}
echo" 






Nomor PO
 - 
";
$s=mysql_query('SELECT * FROM preorder WHERE pabrik = 0 and nonview = 0 GROUP BY no_po ORDER BY no_po ASC');
while($ben=mysql_fetch_array($s)){
echo"$ben[no_po]";
}
echo" 

        var i = $('table tr').length;
var count = $('table tr').length;
var row = i;
var a = 0;

for (a = 0; a <= i; a++) {
  $(".addmore_" + a).on('click', function (a) {
    return function() {
    var box = $("#box_"+ a);
    box.val( Number(box.val())+1 );

      var data = "