listbox cannot make it select single or none, it has to be single or multiple.

Question

raym 2023-2-26

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1919005-listbox-cannot-make-it-select-single-or-none-it-has-to-be-single-or-multiple

评论： raym 2023-2-26

采纳的回答： Simon Chan

在 MATLAB Online 中打开

Hi,I am using listbox to select item.

The aim is to select only one, or no select.

I set min to 0 and max to 1, but the ui does not allow select none.

If I set min to 0 and max to 2, now the ui can select none, but also enables multiple select.

% not allow select none.
figure;uicontrol('Style','listbox',...
    'String',{'rr','tt','gg'},...
    'position',[10,20,100,200],...
    'min',0,...
    'max',1) 
% allow select none, but also allow multiple select
figure;uicontrol('Style','listbox',...
    'String',{'rr','tt','gg'},...
    'position',[10,20,100,200],...
    'min',0,...
    'max',2) 

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Answer 1

Simon Chan 2023-2-26

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1919005-listbox-cannot-make-it-select-single-or-none-it-has-to-be-single-or-multiple#answer_1180085

在 MATLAB Online 中打开

To my understanding, multiple select does not allow select none, it has automatically select the first one unless you assign some other value in its 'Value' properties.

As a workaround, you can assign an empty item in the first selection and the listbox will automatically select the first one unless the user select some other item.

By doing that, the default selection, which is the empty one, can simulate select none in your case.

figure;uicontrol('Style','listbox',...
    'String',{'','rr','tt','gg'},...        % Assign an empty one as the first selection
    'position',[10,20,100,200],...
    'min',0,...
    'max',1) 