ช่วยดู jquery json ทีครับ เหมือนข้อมูลมันส่งไม่มา ..แก้มาหลายวันแล้วครับ TT

 <div class="row">
        			<div class="form-group col-md-4">
        				<label for="barcodeMachine">Barcode</label>
    					<input type="text" class="form-control" id="barcodeMachine<?php echo $i; ?>" placeholder="Enter Barcode" name="barcodeMachine<?php echo $i; ?>" />
  					</div>
        						
        			<div class="form-group col-md-5 col-md-offset-1">
        				<label for="nameMachine">ชื่อหนัง</label>
    					<input type="text" class="form-control" id="nameMovie<?php echo $i; ?>" name="nameMovie<?php echo $i; ?>" />
  					</div>
            </div>

<script type="text/javascript">
$(document).ready(function(){

	$("input[name^='barcodeMachine']").change(function(){
			$.ajax({ 
				url: "autofill.php" ,
				type: "POST",
				data: 'barcode=' +$("input[name^='barcodeMachine']").val()
			})
			.success(function(result) 
			{ 

				var obj = $.parseJSON(result); //'{"na" : "John"}'
				//alert( obj.na === "John" );
					if(obj == '')
					{
						$('input[type=text]').val(''); //เหมือนเข้าเงื่อนไขนี้
					}
					else
					{
						  $.each(obj, function(key, inval) 
						  {

							   $("input[name^='barcodeMachine']").val(inval["barcode"]); //ตรงนี้จำเป็นตรงครบทุกฟิลด์มั้ยครับ
							   $("input[name^='nameMovie']").val(inval["title"]);
							   // $("#txtEmail").val(inval["Email"]);
							   // $("#txtCountryCode").val(inval["CountryCode"]);
							   // $("#txtBudget").val(inval["Budget"]);
							   // $("#txtUsed").val(inval["Used"]);

						  });
					}

			});

		});
	});
</script>

<?php
	include 'connect.php';

try {
	$_POST['barcode'] = 30006000020686;
	$barcode = trim($_POST['barcode']);

		$column = $db->prepare('SELECT * FROM tbl_result WHERE result_barcode = :barcode ');
		$column->bindParam(':barcode', $barcode, PDO::PARAM_STR);
		$column->execute();
		$Colcount = $column->columnCount(); //count column 
		//print("result set has $Colcount columns");

		$resultArray = array();

		//get field name
		//$rs = $db->query('SELECT * FROM tbl_result LIMIT 0');
		for ($i = 0; $i < $Colcount; $i++) //$column->columnCount()
		{
    		$col = $column->getColumnMeta($i);
    		$columns[] = $col['name'];
		}
		//print_r($columns);

		while ($row = $column->fetch()) 
		{
			//echo $row['count'];
			$arrCol = array();
			for($i=0; $i<$Colcount; $i++) 
			{
				$arrCol[$columns[$i]] = $row[$i];
			}
			array_push($resultArray, $arrCol);
		}

		$db = null;

		echo json_encode($resultArray);
	}

catch (PDOException $e) {
 echo 'ERROR: ' . $e->getMessage();
}
?>