Javascript - สอบถามการ Query ฐานข้อมูล โดยการเลือกจาก Checkbox แบบ Real Time

<script src="http://code.jquery.com/jquery-latest.js"></script>
<script type="text/javascript">
$(document).ready(function(){
    var cate;
    $("input.category").change(function(){
        cate = $(this).val();
        $.post("product_list.php",{category:cate},function(data){
                $("#container").html(data);
        });
    });
});
</script>

<input type='radio' class='category' value='iphone5s' />iPhone 5S&nbsp;&nbsp;
<input type='radio' class='category' value='G-note3' />Galaxy Note3&nbsp;&nbsp;<br />
<div id="container" style="width:500px;height:300px;border:1px solid black;overflow:auto;"></div>

<?php
include("connectdb.php");
$sql = "select * from tb1 where category='{$_POST["category"]}' ";
$res = mysqli_query($sql) or die(mysqli_error());
while($data = mysqli_fetch_assoc($res)){
 ......
.........
...........
}
?>