Adding multiple items to a list box in app designer

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Simon Barnatt
Simon Barnatt 2020-5-4
编辑： Cris LaPierre 2020-5-7
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'};

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Cris LaPierre
Cris LaPierre 2020-5-5
编辑：Cris LaPierre 2020-5-5
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=[];
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Cris LaPierre
Cris LaPierre 2020-5-5
编辑：Cris LaPierre 2020-5-7
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.

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