drop down return to the first option

Hello, I have created drop down menu using GUI, using {option 1, ......4}

each option play a sound How to go back to first option, "option 1" after the sound ends. I want be always to go back to the first option once the sound ends, or how to rest the drop down menu to the first the option at the top of the menu

   value = app.PickASoundDropDown_Black_Sp.Value;

            if strcmp(value, 'Click')
                clear all ; close all
                app.chan_Black_Sp = 0;
            elseif strcmp(value, 'Browse a File')

                file = uigetfile('*wav','Select Channel 2 Audio File');

end

so, I want to go back to "Click" after I have picked an audio file is done playing.

[Jan]

What does this mean: "go back to the first option"? What is going to where?

[Abdullah Andergeery]

the drop down menu go to the first option 1 after I pick up for example option 4, I do not the app hang on option 4 and its value.

[Jan]

Please post the code of the callback. Maybe a screenshot clarifies, what "go to the first option" means.

[Abdullah Andergeery]

here is an image so now the dropdown menu is on "click" which is give a command of make red channel = 0 if i pick for example the sound of rain then it going to play sound of rain and the drop down menu will stay on sound of rain option without going back to "click" I hope you can understand what I mean

Answer 1

[Guillaume]

If you're using a uidropdown in app designer, at the end of your callback, after you've emitted your sound, set the dropdown Value property to your uidropdown ItemData(1) value.

If you're using a uicontrol of style 'popupmenu', set its Value property to 1 instead.

[Abdullah Andergeery]

this not working.

if true
  % code
value = app.PickASoundDropDown_Black_Sp.Value;

            if strcmp(value, 'Click')
                clear all ; close all
                app.chan_Black_Sp = 0;
            elseif strcmp(value, 'Browse a File')

                file = uigetfile('*wav','Select Channel 2 Audio File');
[y,Fs] = audioread(file)
value= DataItems(1);
  end 
I also tried 
value= DataItems('Click');

[Jan]

Please explain "is not working" with details, preferably the error message.

What is "DataItems"?

Do you mean:

app.PickASoundDropDown_Black_Sp.Value = 1

?

[Abdullah Andergeery]

ops! I tried this

 if s.IsDone

 value=ItemsData(1)  ;
            end

[Guillaume]

Setting the variable value to whatever is never going to affect the dropdown itself. You need to tell matlab it's the dropdown value you want to change, so:

app.PickASoundDropDown_Black_Sp.Value = app.PickASoundDropDown_Black_Sp.DataItems(1);

[Abdullah Andergeery]

thank you A looot that did work, but i used "Items" rather than "DataItems". Do you what is the different between "Items" ,and "DataItems" ?

[Guillaume]

DataItems is used to associate values to the drop down selection that is different from what is displayed to the user. If you've left DataItems empty, the Value property will be the Items selected, otherwise it will be the corresponding DataItems.