自动完成显示一个未定义的列表

我一直在使用jQuery UI自动完成，从数据库和自动完成字段的其余部分提出建议。这是我的代码。

HTML:

<form action="#" method="post">
 <p><label for="kdbr">KDBR</label><br />
     <input type="text" name="kdbr" id="kdbr" value="" /></p>
 <p><label for="nmbr">NMBR</label><br />
     <input type="text" name="nmbr" id="nmbr" value="" /></p>
</form>

Javascript:

$(function() {
        //clear values on refresh
        $('#nmbr').val("");
        $("#kdbr").autocomplete({
            source: "<?php echo base_url();?>js/coba3.php",
            minLength: 3,
            select: function(event, ui) {
                $('#nmbr').val(ui.item.nmbr);
            }
        });
    });

PHP:

<?php 
$dbhost = 'HOST';
$dbuser = 'USERNAME';
$dbpass = 'PASSWORD';
$dbname = 'TBNAME';
$conn = mysql_connect($dbhost, $dbuser, $dbpass) or die ('Error connecting to mysql');
mysql_select_db($dbname);
$return_arr = array();
/* If connection to database, run sql statement. */
if ($conn)
{
    $fetch = mysql_query("SELECT * FROM tb_master_barang where kdbr like '%" .mysql_real_escape_string($_GET['term']) . "%'");
/* Retrieve and store in array the results of the query.*/
while ($row = mysql_fetch_array($fetch, MYSQL_ASSOC)) {
    $row_array['kdbr'] = htmlentities(stripslashes($row['kdbr']));
    $row_array['nmbr'] = $row['nmbr'];
    array_push($return_arr,$row_array);
}
}
mysql_close($conn);
echo json_encode($return_arr);
?>

下拉列表显示了kdbr中未定义的值。我已经单独运行了php，它返回了这个值:

[{"kdbr":"950.00.0002","nmbr":"PAKAIAN DINAS KS"},{"kdbr":"950.01.0000","nmbr":"BARANG SCURITY LSNG.PAKAI"},{"kdbr":"950.01.0001","nmbr":"PECI"},{"kdbr":"950.01.0002","nmbr":"KOPEL REM HITAM"},{"kdbr":"950.01.0003","nmbr":"SEPATU PDH"},{"kdbr":"950.01.0005","nmbr":"ROMPI SATPAM"},{"kdbr":"950.01.0006","nmbr":"SEPATU PDL"},{"kdbr":"950.01.0007","nmbr":"TALI KOOR & PLUIT"},{"kdbr":"950.01.0008","nmbr":"PAKAIAN TAHAN API"},{"kdbr":"950.01.0009","nmbr":"HELM TAHAN API"},{"kdbr":"950.02.0001","nmbr":"KAOS SCURITI PNJG'/BED'/LOG DLL"}]

谁能告诉我我哪里做错了?

 $("#kdbr").autocomplete({
        source: function (request,  {
            var ajax_url = "<?php echo base_url();?>js/coba3.php?term=" + request.term;
            $.ajax({
                url: ajax_url,
                success: function (response) {
                    // assuming valid json
                    var data = $.parseJSON(response);
                    response($.map(data, function (obj) {
                        return {
                            label: obj.name + ': ' + obj.description,
                            value: obj.name,
                            id: obj.name
                        };
                    }));
                }
            });
        },
        minLength: 3,
        select: function (event, ui) {
            $('#nmbr').val(ui.item.nmbr);
        }
    });

  select: function(event, ui) {
          jQuery.get(ui.item.nmbr);
        }