How to make an interactive drop down in App Designer?

I want to make an application for App Designer that uses a drop down button, a button group, and a pushbutton to display different images on a UIAxes. The user should be able to select a drop down value, then based on that value, be allowed to choose only from a selection of the radio buttons available in the button group. Then click the push button and a certain image will display.

For example:

UIdropdown has the items: 'A', 'B', 'C'

UIButtongroup has the uiradiobuttons: app.Red, app.Blue, app.Green, app.Yellow

If the user selects the item 'A', then I want the uiradiobuttons app.Yellow and app.Blue to have the 'Enable' property set to 'off', such that the user will only be able to select either uiradiobuttons app.Red or app.Green.

So I how to disable the uiradiobutton if I have a callback on pushbutton:

eg./ app.Blue.Enable = 'off'; app.Yellow.Enable = 'off';

My problem is I do not know how to apply this for a drop down component based on the items the user selects. I tried to write a callback on the drop down component using conditionals (if...else) but for every other item after the 1st item in the drop down component, I get this error:

Error using uiradiobutton (line 58) There is no on property on the RadioButton class.

It also only works after I click the pushbutton.

Answer 1

[Elias Gule]

Add a 'DropDownValueChanged' callback to your uidropdown;

[Raees Mohammed]

I added a 'ValueChangedFcn' callback on the uidropdown when I right clicked it and selected callbacks. Is there a specific callback named 'DropDownValueChanged'? If so, how do I get it?

[Raees Mohammed]

Thanks, I got it to work.

If the dropdown was named Letter and the RadioButton group was named Colour.

L = app.Letter.Value;
if strcmp(L,'A')
  %code for letter A
  app.Red.Enable = 'on';
  app.Blue.Enable = 'off';
  app.Green.Enable = 'on';
  app.Yellow.Enable = 'off';
elseif strcmp(L,'B')
  %code for letter B
elseif strcmp(L,'C')
  %code for letter C
else
  %Default
  app.Red.Enable = 'on';
  app.Blue.Enable = 'on';
  app.Green.Enable = 'on';
  app.Yellow.Enable = 'on';
end

[Francheska Payongayong]

Hi, I'm currently working on an application that needs an interactive drop down button; and your code really helped. However, I just want to know, is it possible to create an interaction between two drop down buttons?