How can I define conditional units in App Designer?

This is my first attempt at App Designer, so pardon my ignorance. I want to provide the user with the option to change between unit systems using a radio button. The execution of that is simple enough, but I am at a loss how to display and change units to accompany the input fields. For example, if the user selects SI units, then the units of the Altitude input should be m, if they choose BG then it should be ft. I started off trying to create simple labels next to the inputs thinking I could make those conditional (if/then), but it's not working out for me. I would really appreciate a shove in the right direction.

Also, it seems from other questions I have reviewed that using super/subscripts in labels is not supported, for example area in m^2. Can anyone confirm if that has changed in R2021 or if that remains unsupported.

HELP!

Answer 1

[Reshma Nerella]

Hi

Add selectionChanged callback for the button group. Get the button text everytime the value is changed and accordingly change the labels

For instance,

function ButtonGroupSelectionChanged(app, event)
            selectedButton = app.ButtonGroup.SelectedObject.Text;
            if strcmp(selectedButton, "BG")
                % modify labels text according to BG units
                app.m2Label.Text = 'm^2'; 
                app.kgsLabel.Text = 'kg/s';
            else
                % modify labels text according to SI units
                app.m2Label.Text = 'x';
                app.kgsLabel.Text = 'y';
            end
           
end

Refer to the documentation page to know more about button group callbacks.

Hope this helps!