Is it possible to have a hidden field or a display field?

[wyxcoder]

I want to show a Total somewhere, for example, I have two Select and a summary to show the total of the two selected value, like

horizontalSelect 1 (attribute:a) => 20
horizontalSelect 2 (attribute:b) => 30
The total is 50

How can I have a widget to show the three line, the ideal way is have a third form field with attribute c and value set to 50, so when I submt, I can submit value like
{ "a":20, "b":30", "c":50}

Thanks

[danvick]

Hi @wyxcoder,
You could build your own custom FormBuilderField for this scenario.
Kindly refer here on how to construct a custom field

[atiqsamtia]

The Easy way would be to add a TextField with readOnly flag to true.

FormBuilderTextField(
            readOnly: true,
            attribute: "c",
            decoration: InputDecoration(labelText: "Total"),
          ),