Calculation of fields in Chronoforms7

My first post on this forum.
I'm currently working on a migration of Joomla 3 towards Joomla 4. On Joomla 3 I used Breezingforms, but since its not developed anymore I am looking for an alternative so I came to ChronoForms.
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I've recreated my form but there are a couple of things which I am not able to get it working on ChronoForms. For example, I use calculation on fields in the form.
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In breezingforms I used the following;
function ff_fd_volwassenen_action(element, action)
{
ff_getElementByName('fd_bedrag').value =
Number(ff_getElementByName('fd_volwassenen').value) * 24 +
Number(ff_getElementByName('fd_kinderen').value) * 15;
}
// ff_fd_volwassenen_action
​
Basicly it get the input of 2 fields, multiply it and sum it to a total.
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Is this possible to get it working on ChronoForms?

Hi jevago,
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if you use the Advanced form type then there are Actions available where you can add Custom PHP or JavaScript to do tasks like this.
​
Bob

IN a PHP Action use this:
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To get a CF7 variable {var:my_var} in a PHP variable:
$varPhp1=$this->get("cf7_var", "");
​
To get a CF7 data {data:my_data] in a PHP variable:
$varPhp2=$this->data("data_field_name", default_value);
default_value may be 0 (numeric), "" (string), [ ] (array), ...
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So you can use php o calculate, like this, for example
$varPhp3= $varPhp1 + 15 *$varPhp2;
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Then to set a var CF7 with the result:
$this->set("cf7_var", $varPhp3);
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To set a data CF7 with the result:
$this->data("data_field_name", $varPhp3,true);