Untitled

Passing value along with MySQL retrieved value as hidden value in JavaScript to AJAX function
<select name="update" onchange="updatequantity(this.value,<?php echo $row['products_id']; ?>)" >

<script src="http://ajax.googleapis.com/ajax/libs/dojo/1.7.2/dojo/dojo.js"></script>
<script type="text/javascript">
function updatequantity(input, id)
    dojo.xhrPost({
            url: "updatequantity.php",
            content: {
                  id: id,
                  quantity: input.value
            },
            load: function(result) {
                  result //this variable will hold the quantity
            }
    });
</script>

<?php
$id = $_POST['id'];
$quantity = $_POST['quantity'];
//some sql query like "update cart_items set quantity=".$quantity." where id=".$id.";"
echo $quantity;