MATLAB R2017b UIListBox possible bug (ItemsData)

5 次查看（过去 30 天）
Liron Stettiner
Liron Stettiner 2019-9-16
回答： Manas Meena 2020-9-30
Hello, My name is Liron. I use MATLAB R2017b.
I’m currently working on an App Designer GUI, in which I use a UIListBox and assign data to each Item in the list. The three properties related to my bug/issue are ‘Value’, ‘Items’ and ‘ItemsData’. As far as I know:
The ‘Items’ property is a cell/string Array which determines the titles of the user’s possible choices.
The ‘Value’ property is the current chosen Item, highlighted in blue. Obviously, This ‘Value’ has to be the same as one of the ‘Items’.
The ‘ItemsData’ property is a 1-n cell/double array (where n = length(Items)) which allows us to assign additional, hidden data to each item in the list.
PROBLEM: After setting ‘ItemsData’ to be anything else than an empty array, MATLAB mistakenly thinks the ‘Value’ is supposed to be one of the values of the ’ItemsData’(!) array, instead of the ‘Items’ array. In my specific case I’ve set the following:
% BEFORE ASSIGNING THE ‘ITEMSDATA’ PROPERTY:
>> App.nameListBox.ItemsData -> {} % check
>> App.nameListBox.Items = {‘option 1’};
>> App.nameListBox.Value = ‘option 1’; % Works good
% ASSIGNING THE ‘ITEMSDATA’ PROPERTY:
>> S = struct;
>> S.a = 1; % For instance
>> App.nameListBox.ItemsData = S;
>> App.nameListBox.Items -> {‘option 1’} % check
>> App.nameListBox.Value -> (the struct, S, even though I haven’t changed the ’Items’ property at all).
Does anyone have any idea why this happens? Is this a bug of this version of MATLAB? Have I done something wrong? Any suggestions?
Thank you very much. Sincerely, Liron Stettiner

请先登录，再回答此问题。

采纳的回答

Manas Meena
Manas Meena 2020-9-30
The ListBox is working as intended and this is not a bug. It is a defined property of ListBox which states that “If ItemsData is not empty, then Value must be set to an element of ItemsData, and the list box will select the associated item in the list.”
You may refer to the documentation link below to learn more about the ListBox, Properties which control the appearance and behaviour of a ListBox.
https://www.mathworks.com/help/matlab/ref/matlab.ui.control.listbox-properties.html?s_tid=srchtitle

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Migrate GUIDE Apps 的更多信息

标签

产品


版本

R2017b

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by