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I need to populate ListBox_2 when an item in ListBox_1 is selected

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Maura Monville
Maura Monville 2022-5-31
评论： Jon 2022-5-31
I have 4 ListBoxes in my GUI created through App Designer.
I need to populate Listbox_2 according to which item in ListBox_1 has been selected.
Basically I need an event "Item_Selected" ad relative callback that does not seem to ba available for the ListBox.
The only cllback available is "ValueChanged". Is such an event triggered when an item is selected?
How can I generate such an evet myself?
Thank you very much

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Jon
Jon 2022-5-31
I have attached an example of how to do what I think you are asking
  2 个评论
Jon
Jon 2022-5-31
Basically you provide a Value Changed callback function for the first list. In this function you look at the selection, e.g. app.ListBoxA.Value, and define the Items property of the second list based on this choice.
% Value changed function: ListBoxA
function ListBoxAValueChanged(app, event)
value = app.ListBoxA.Value;
% Build second drop down based on selection in first drop down
switch value
case 'Vegetable'
app.ListBoxB.Items = {'carrots','peas','brocolli'};
case 'Grain'
app.ListBoxB.Items = {'wheat','millet','barley'};
case 'Cheese'
app.ListBoxB.Items = {'camembert','cheddar','brie'};
end

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