Chronoforms V6 - Use dropdown data for onchange

Hello,
​
I am using dropdowns to collect data and based on change in that data, I need to calculate a value and display in another field. This needs to be done before the form is submitted.
​
But in the onchange function I wrote when I try to read the value of the selected dropdown field, I am getting undefined value.
​
Can you pls let me know how to get this done?
​
Regards,
Alladi

Hi Alladi,
​
If you still experimenting with this then I recommend that you download v7 beta2 and try it:
http://www.chronoengine.com/blog
​
Does it work better ?

Hi Max,
​
I need a fix urgently. If possible can I use PHP code to calculate and set the form data after submit and before DBsave?
​
But unfortunately, I am unable to find the proper syntax to access form data in Chronoforms v6.
​
This is the code I used. I want to calculate "tot" field from dp1 and dp2 (both dropdowns). The following is the code I used and the debug data.
​

$t = $this->data("dp1",0) + $this->data("dp2", 0);
$this->set("tot", $t); 
return 1;

Debug Data

Array
(
    [option] => com_chronoforms6
    [cont] => manager
    [chronoform] => Test Form
    [event] => submit
    [dp1] => 2
    [dp2] => 2
    [tot] => 
    [button3] => 
)

Array
(
    [submit_validate_fields] => Array
        (
            [log] => Automatic validation enabled.
            [var] => 1
        )

    [php10] => Array
        (
            [returned] => 1
            [var] => 1
        )

    [save_data8] => Array
        (
            [data] => Array
                (
                    [tot] => 
                    [dp1] => 2
                    [dp2] => 2
                )

            [_success] => Data saved successfully
            [log] => Array
                (
                    [0] => INSERT INTO `enjte_chronoforms_data_return_test` (`tot`, `dp1`, `dp2`)  values  ('', '2', '2');
                )

            [var] => Array
                (
                    [tot] => 
                    [dp1] => 2
                    [dp2] => 2
                    [aid] => 81
                )

        )

)

Kindly guide me as the requirement is urgent.

$this->set("tot", $t);

should be:

$this->data["tot"] = $t;