print menggunakan checkbox

mau nannya master kira kira dimana kesalahhannya ko gk bisaa jalan mentog terus form

  <!-- REPORT issue -->
                            <div class="panel panel-default">
                                <div class="panel-heading">
                                    <h3 class="panel-title">REPORT ISSUE</h3>
                                    <ul class="panel-controls">

<!---------tombol prinnya disisi----------------------------------------------------------------------------->
<li><a href="#" id="hapus_record" class="panel-default"><span class=""> <span id="jumlah_pilih">print</span></span></a></li>

<li><a href="#" class="panel-collapse"><span class="fa fa-angle-down"></span></a></li>
<li><a href="#" class="panel-refresh"><span class="fa fa-refresh"></span></a></li>
<li><a href="#" class="panel-fullscreen"><span class="glyphicon-fullscreen"></span></a></li>
<li><a href="#" class="panel-remove"><span class="fa fa-times"></span></a></li>

                                    </ul>
                                </div>


<?php
include '../connection.php';

if(isset($_POST['cari'])){

//menangkap nilai form
$tgl_awal=$_POST['tgl_awal'];
$tgl_akhir=$_POST['tgl_akhir'];
echo '<div class="panel-body">';
if (empty($tgl_awal) and empty($tgl_akhir))  {
$result1 = mysql_query("SELECT * from stock_out");
}else{

$result1 = mysql_query("select * from stock_out where date between '$tgl_awal' and '$tgl_akhir'");
}


echo '<table class="table table-striped table-bordered dono">';

                                echo '<thead>';
                                echo '<tr>';
<!---------all checkbox----------------------------------------------------------------------------->
                                echo '<th width="4%"><input type="checkbox" id="pilih_semua"></th>';
                                echo '<th width="4%">ID</th>';
                                echo '<th width="10%">ITEM CODE</th>';
                                echo '<th width="30%">DESCRIPTIONS</th> ';
                                echo '<th width="5%">QTY</th> ';
								echo '<th width="5%">UNIT</th> ';
								echo '<th width="8%">DATE</th> ';
								echo '<th width="8%">DOC.NO</th> ';
								echo '<th width="8%">RECEIVED</th> ';
								echo '<th width="8%">ACTION</th> ';




                                            echo '</tr>';
											echo '</thead>';
                                            echo '<tbody  id="myTable" >';
                                            ?>
	                                       <?php
											while($row=mysql_fetch_array($result1)){


  <!--------- checkbox----------------------------------------------------------------------------->
                                            echo '<tr id="'.$row["id"].'">';
											echo '<td><input type="checkbox" class="pgw_checkbox" data-pwg-id="'.$row["id"].'"></td>';
											 echo "<td>" .$row["id"]. "</td>";
                                            echo "<td>" .$row["item_code"]. "</td>";
                                            echo "<td>" .$row["description"]. "</td>";
                                            echo "<td>" .$row["qty"]. "</td>";
                                            echo "<td>" .$row["unit"]. "</td>";
                                            echo "<td>" .$row["date"]. "</td>";
											echo "<td>" .$row["doc_no"]. "</td>";
											echo "<td>" .$row["rec"]. "</td>";

											$item_code=''.$row["item_code"].'';

echo "<td><a href='return.php?stockno=".$row['item_code']."'class='btn btn-info btn-xs'>DETAIL</a> <a href='return.php?stockno=".$row['item_code']."'class='btn btn-info btn-xs'>RETURN</a></td>";

                                            echo'</tr>';
                                        }
                                        echo'</tbody>';
                                        echo'</table>';




                        } else{
unset($_POST['cari']);
}

								   echo'</div>';

                            echo'</div>';
                         echo'</div>';


                 ?>

java script

 $('document').ready(function() {
	// checkbox untuk mencentang semua
	jQuery('#pilih_semua').on('click', function(e) {
		if($(this).is(':checked',true)) {
			$(".pgw_checkbox").prop('checked', true);
		}
		else {
			$(".pgw_checkbox").prop('checked',false);
		}
		// mengatur semua jumlah checkbox yang dicentang
		$("#jumlah_pilih").html($("input.pgw_checkbox:checked").length+"");

	});
	// mengatur jumlah checkbox tertentu yang dicentang
	$(".pgw_checkbox").on('click', function(e) {
		$("#jumlah_pilih").html($("input.pgw_checkbox:checked").length+"");
	});

	// hapus record yang dicentang
	jQuery('#hapus_record').on('click', function(e) {
		var pegawai = [];
		$(".pgw_checkbox:checked").each(function() {
			pegawai.push($(this).data('pwg-id'));
		});
		if(pegawai.length <=0)  {
			alert("No Data Selected.");
		}
		else {
			var message = "Sure you want remove this data.?";
			var checked = confirm(message);
			if(checked == true) {
				var selected_values = pegawai.join(",");
				$.ajax({
					type: "POST",
					url: "printissue.php",
					cache:false,
					data: 'pwg_id='+selected_values,
					success: function(response) {

					}

				});
			}
		}
	});
});

prosessss print

 <?php
include_once("konek_db.php");

if(isset($_POST['pwg_id'])) {
$pwg_id = trim($_POST['pwg_id']);
$id=$pwg_id;
require('assets/pdf/fpdf.php');

$pdf = new FPDF("L","cm","A4");

$pdf->SetMargins(2,1,1);
$pdf->AliasNbPages();
$pdf->AddPage();
$pdf->SetFont('Times','B',11);
$pdf->Image('logo/logo.png',1,1,2,2);
$pdf->SetX(4);
$pdf->MultiCell(19.5,0.5,'SPARE PARTS',0,'L');
$pdf->SetX(4);
$pdf->MultiCell(19.5,0.5,'REPORT ISSUE SPAREPARTS',0,'L');
$pdf->SetFont('Arial','B',10);
$pdf->SetX(4);
$pdf->MultiCell(19.5,0.5,'Priode : '.date("D-d/m/Y"),0,'L');
$pdf->SetX(4);
$pdf->MultiCell(19.5,0.5,'warung kopi',0,'L');
$pdf->Line(1,3.1,28.5,3.1);
$pdf->SetLineWidth(0.1);
$pdf->Line(1,3.2,28.5,3.2);
$pdf->SetLineWidth(0);
$pdf->ln(1);
$pdf->SetFont('Arial','B',14);
$pdf->Cell(25.5,0.7,"Report Data Issue",0,10,'C');
$pdf->ln(1);
$pdf->SetFont('Arial','B',10);
$pdf->Cell(5,0.7,"POST : ".date("D-d/m/Y"),0,0,'C');
$pdf->ln(1);
$pdf->SetFont('Arial','B',10);
$pdf->Cell(1, 0.8, 'NO', 1, 0, 'C');
$pdf->Cell(3, 0.8, 'Item Code', 1, 0, 'C');
$pdf->Cell(15, 0.8, 'Descriptions', 1, 0, 'C');
$pdf->Cell(2, 0.8, 'Qty', 1, 0, 'C');
$pdf->Cell(2.5, 0.8, 'Unit', 1, 0, 'C');
$pdf->Cell(2.5, 0.8, 'Price', 1, 1, 'C');
$pdf->SetFont('Arial','',10);
$no=1;
$query=mysql_query("select * from stock_out  WHERE id='$id'");
while($lihat=mysql_fetch_array($query)){
	$pdf->Cell(1, 0.8, $no , 1, 0, 'C');
	$pdf->Cell(3, 0.8, $lihat['item_code'],1, 0, 'C');
	$pdf->Cell(15, 0.8, $lihat['description'], 1, 0,'C');
	$pdf->Cell(2, 0.8, $lihat['act'],1, 0, 'C');
	$pdf->Cell(2.5, 0.8, $lihat['unit'], 1, 0,'C');
	$pdf->Cell(2.5, 0.8, $lihat['price'],1, 1, 'C');

	$no++;
}

}
$pdf->Output("Report Issue.pdf","I");

?>