Can I use restriction of selections in multiple mode in listdlg?

4 次查看（过去 30 天）
Varun Jadhav
Varun Jadhav 2016-8-19
回答： TED MOSBY 2025-8-21，6:12
Hi,
I am using listdlg to list out a file showing multiple currents outputs.
I always need to select only three currents at a time hence need to give restriction in 'SelectionMode' of 3 to avoid user errors.
This is the function I call when I need to do the assignment of the amplifier.
function listboxMIa_Callback(hObject, eventdata, handles)
CurrentArrayLabel = evalin('base', 'CurrentArrayLabel');
[MI_aheader,~] = listdlg('PromptString',{'Select the current outputs for Channel A:' '(Please select a maximum of 3 outputs)'},...
'Name', 'Amplifier Assignment',...
'ListSize', [250, 125],...
'ListString',CurrentArrayLabel);
assignin('base', 'MI_aheader', MI_aheader);
Is this possible?
Regards,
Varun Jadhav

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回答（1 个）

TED MOSBY
TED MOSBY 2025-8-21，6:12
Hi,
As of today, listdlg can only do single vs multiple - it cannot limit the number of selections by itself. You have to manually validate the number of selections.
need = 3;
[idx, ok] = listdlg('PromptString', {sprintf('Select exactly %d items:', need)}, ...
'SelectionMode','multiple', ...
'ListString', CurrentArrayLabel, ...
'ListSize', [250 125], ...
'Name','Amplifier Assignment');
if ~ok, idx = []; return; end
if numel(idx) == need, return; end
uiwait(warndlg(sprintf('Select exactly %d items (you picked %d).', need, numel(idx)), ...
'Invalid selection','modal'));
You may contact MathWorks Technical Support if you want this feature to be added!
Hope it helped.

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