update data tanpa reload page

assalamualaikum , saya ingin bertanya bagiamana cara update data tanpa reload halaman :soalnya pada saat saya masuk di form , ada pilihan untuk pilih department , setelah saya pilh muncul beberapa data usulan, nah ada data usulan ygn saya ingin edit , pas berhasil edit ,halamannya malah reload dan saya harus kembali pilih deprtmen...saya mnta bntuannya supaya setelah update data hlammnya tetap pada sesi selcted yang dipilih.

saya lampirkan gambar dan codingnya

<a href='https://imgur.com/MFrei8o'>https://imgur.com/MFrei8o</a> <a href='https://imgur.com/a/bHwPReY'>https://imgur.com/a/bHwPReY</a>

<?php
$dept=$_SESSION['namauser'];
?>
<script type="text/javascript">
$(function() {
	$("#theTable.satu tr:even").addClass("stripe1");
	$("#theTable.satu tr:odd").addClass("stripe2");

	$("#theTable.satu tr").hover(
		function() {
			$(this).toggleClass("highlight");
		},
		function() {
			$(this).toggleClass("highlight");
		}
	);
});
function deleteRow(ID) {
	var id	= ID;
   var pilih = confirm('Cetak Usulan No.  = '+id+ '?');
	if (pilih==true) {
		$.ajax({
			type	: "POST",
			url		: "modul/pinjaman/ctk.php",
			data	: "id="+id,
			success	: function(data){
				$("#tampil_data1").load("modul/pinjaman/tampil_data1.php");
			}
		});
	}
}
</script>
<script language="javascript" src="modul/pinjaman2/ajax.js"></script>
<style type="text/css">
button {
	margin: 1px;
	position: relative;
	padding: 4px 8px 4px 4px;
	cursor: pointer;
	list-style: none;

}

.a {
	margin: 1px;
	position: relative;
	padding: 4px 8px 4px 4px;
	cursor: pointer;
	list-style: none;
	width:50px;
	font-size:10px;

}
button span.ui-icon {
	float: left;
	margin: 0 4px;
}
</style>

<form method="POST" action="">
<select name="ftoko" class="d form-control">
                <option value=all> ~ Semua Dept ~
               <?php
	//include '../../inc/inc.koneksi.php';

         $qrystrk = "select DISTINCT(username) from os_dept a left join os_ga b on a.username=b.dept where a.username not in ('bmmks','bm') ";
		 $resultk   = mysql_query($qrystrk);
		 $no=1;
         while ($row = mysql_fetch_array($resultk, MYSQL_BOTH)) {
			$no++;
            echo "<option value=\"" . $row['username'] . "\">"  .$row['username'];
		 }

		 mysql_free_result($resultk);
               ?>
</select>
<input type="submit" value="CARI" name="ok"/>
</form>

<?php
if(isset($_POST['ok'])){

$user=$_POST['ftoko'];

	$filshop = "";
	if ($_POST['ftoko']!="all") {
	    $filshop = " and dept='" .$_POST['ftoko']. "'";
		}
// www.contoh-ta.com
//author : asep setiawan & Team
ini_set('display_errors', 1);
ini_set('error_reporting', E_ERROR);
include '../../inc/inc.koneksi.php';
include '../../inc/fungsi_tanggal.php';
include '../../inc/fungsi_koperasi.php';
$tgl1	= $_POST['tgl1'];
$tgl2	= $_POST['tgl2'];
if(!empty($tgl1)) {
	$where	= " WHERE tgl BETWEEN '$tgl1' AND '$tgl2'";
}else{
	$where ="";
}

echo "
<div id='tampil_data'>
<table id='theTable' class='satu' width='100%'>
		<tr>
			<th rowspan='2' width='5%'>No</th>
			<th rowspan='2'>No usulan</th>
			<th rowspan='2'>Tgl Usulan</th>
			<th rowspan='2'>Dept Tujuan</th>
			<th rowspan='2'>Deskripsi</th>
			<th rowspan='2'>qty</th>
			<th colspan='2'>BM</th>
			<th rowspan='2'>STATUS</th>
		</tr>
		<tr>
			<th colspan='2'>Approve</th>
		</tr>

		";
	$sql	= "select * from os_ga where usulan>'2018-09-01' and pesanan='0000-00-00' and pengerjaan='0000-00-00' " .$filshop. " order by usulan desc" ;
	$query	= mysql_query($sql);
	$no=1;
	while($rows=mysql_fetch_array($query)){
		echo "<tr>
				<td align='center'>$no</td>
				<td align='center'>$rows[id]</td>
				<td align='center'>$rows[usulan]</td>
				<td align='center'>$rows[tujuan]</td>
				<td align='center'>$rows[deskripsi]</td>
				<td align='right'>".number_format($rows[qty])."</td>
				";
				if ($rows['keterangan']=='Y') {
				echo"
				<td align='center' bgcolor='#00FF00'>
					<a href=\"../../osga/modul/pinjaman2/approve.php?id=" . $rows['id'] . "&kd=". $rows['kd'] ."\" target=\"_self\"  onclick='return false;'>YA</a>
				</td>

				<td align='center' bgcolor='#00FF00'>
					<a href=\"../../osga/modul/pinjaman2/rejected.php?id=" . $rows['id'] . "&kd=". $rows['kd'] ."\" target=\"_self\" onclick='return false;'>TDK</a>

				 </td>

				";
					}elseif($rows['keterangan']=='N'){
				echo"
				<td align='center' bgcolor='#ff7607'>
					<a href=\"../../osga/modul/pinjaman2/approve.php?id=" . $rows['id'] . "&kd=". $rows['kd'] ."\" target=\"_self\" onclick='return false;'>YA</a>
				</td>


				<td align='center' bgcolor='#ff7607'>

					<a href=\"../../osga/modul/pinjaman2/rejected.php?id=" . $rows['id'] . "&kd=". $rows['kd'] ."\" target=\"_self\" onclick='return false;'>TDK</a>
				</td>
				";
				}else{
				echo"
				<td align='center' bgcolor='#FFFFFF'>
					<a href=\"../../osga/modul/pinjaman2/approve.php?id=" . $rows['id'] . "&kd=". $rows['kd'] ."\" target=\"_self\">YA</a>
				</td>
				<td align='center' bgcolor='#FFFFFF'>

					<a href=\"../../osga/modul/pinjaman2/rejected.php?id=" . $rows['id'] . "&kd=". $rows['kd'] ."\" target=\"_self\" >TDK</a>

				</td>
				";
				}

				if ($rows['keterangan']=='Y') {

				echo "
				<td align='center' bgcolor='#00FF00'>
					<b>APPROVE</b>
				</td>
				";
				}elseif($rows['keterangan']=='N'){
				echo "
				<td align='center' bgcolor='#ff7607'>
					<b>REJECT</b>
				</td>
				";
				}
				/*
				elseif($rows['keterangan']=='N'){
				echo "
				<td align='center' bgcolor='#ff7607'>
					<b>REJECT</b>
				</td>
				";
				}*/else{
				echo "
				<td align='center' bgcolor='#FFFFFF'>
					<b>WAIT</b>
				</td>

				";
				}
				echo"</tr>";
				$no++;

	}
echo "
	</table>

	</div>

	";

}

?>