Adding multiple items to a list box in app designer

Hi,

I am trying to add multiple items to the list box. However, it only displays the first item. The screen shot of the result and the code are below. I am in 2019a.

Thank you in advance for any help! :)

app.TrainClassListBox.Items={'30','40'};    
app.TrainClassListBox.Items(3)={'60'};

Answer 1

[Cris LaPierre]

Your code adds the new field. Are you getting an error message, or is it just not displaying? Perhaps look into what is entered in app.ListBox.ItemsData? This controls what is displayed in the ListBox. It seems like it is set to 1. Try setting it back to the default (empty brackets).

app.TrainClassListBox.ItemsData=[];

[Simon Barnatt]

Hi,

Sorry for the late response. I am in the UK.

The attributes are as follows.

There is no error message, it just won't display the 40 or 60.

Thanks :)

[Cris LaPierre]

The issue is with how you have entered ItemsData. You are using a 1x1 cell array. Try using the setting I originally mentioned

app.TrainClassListBox.ItemsData = [];

or, if you have a reason to use numbers (users do not see these values), try something like this

app.TrainClassListBox.ItemsData = {1 2 3}; 
% or
app.TrainClassListBox.ItemsData = [1 2 3];

I also tested the following

app.TrainClassListBox.ItemsData = [1:1000]; % this worked
app.TrainClassListBox.ItemsData = {1:1000}; % This did not

The best thing, then, is to read up more on the ItemsData field so that you can use it as intended.

[Simon Barnatt]

Working! Thank you! :)