Question: I have a little problem with the jQuery - In jquery ui confirm dialog i have 2 inputs:
first - hidden with precise value=""
second - input text - and here is the problem. 

When I click "ok" the script sending me only first value, second is empty. But when I write the value="123" there two are sending. 

HTML:

```
<input type="text" value="" class="MyIn" id="MyIn" name="MyIn" >
<input type="hidden" value="<?=$r['order_id'];?>" class="orderid" id="orderid" >

```

JavaScript:

```
  $("a.opener").click(function (e) {
        $("#dialog-message").dialog({

            buttons: {
                Ok: function () {
                    var sendNumber = $("input#MyIn").val();
                    var orderid = $("input#orderid").val();

                    var dataString = 'orderid=' + orderid + '&sendNumber=' + sendNumber;

                    $.ajax({
                        type: "POST",
                        url: "moduls/send.php",
                        data: dataString,
                        success: function () {
                            $("#dialog-message").dialog("close");
                        }
                    });
                    return false;

                }
            }
        });
    });

```

Answer: 
I very much suspect that `<?=$r['order_id'];?>` is returning an empty string. If this is the case it will not be sent through. Also dataString is not the preferred way of handing params in jQuery. Bellow is with a catch for this scenario:

```
$("a.opener").click(function (e) {
    $("#dialog-message").dialog({

        buttons: {
            Ok: function () {

                // if sendNumber fails or evaluates to false, 
                // it will be replaced with 'null', insuring its sent anyway
                // and you can trap on the serverside.
                var sendNumber = $("input#MyIn").val() || 'null';
                var orderid = $("input#orderid").val();

                var postData = { orderid : orderid, sendNumber : sendNumber};

                //shorthand of extra niceness
                $.post('moduls/send.php', postData, function(){
                     $("#dialog-message").dialog("close");
                });
                return false;

            }
        }
    });
});

```
Your current jQuery code should be working as the refence of the hidden input element's value is valid.

Demo: <http://jsfiddle.net/3qpV4/>

Try alerting the value to ensure it is being set properly. If it isn't, then you know that the problem is in your PHP variable expansion. If it does alert, then the issue is with your PHP file `send.php`.