Output argument (and possibly others) not assigned value in the execution with "choosedialog2" function

The code worked for all cell number selections except the first index of 1

Not sure where to correct and run the code?

specific_index = choosedialog2(num2cell(1:20))

[Walter Roberson]

dbtype choosedialog2

1     function [val] = choosedialog2 (menuitems)
2     
3     d = dialog('Position',[300 300 250 150],'Name','Select One');
4     
5     txt = uicontrol('Parent',d,...
6         'Style','text',...
7         'Position',[20 80 210 40],...
8         'String','Select a number of the test data to delete');
9     
10    obj = uicontrol('Parent',d,...
11        'Style','popup',...
12        'Position',[75 70 100 25],...
13        'String',menuitems,...
14        'Callback',@popupCallback);
15    
16    btn = uicontrol('Parent',d,...
17        'Position',[89 20 70 25],...
18        'String','Close',...
19        'Callback','delete(gcf)');
20    
21    
22    
23    % Wait for d to close before running to completion
24    uiwait(d);
25    
26    
27        function popupCallback ( obj, event )
28            str = get ( obj, 'string' );
29            val = get ( obj, 'value' );
30            
31        end
32    
33    end
34    %%

Answer 1

[Walter Roberson]

uicontrol() style popup only triggers the callback when the selection changes

When you create a uicontrol popup, the default selection Value is 1 -- first item already selected.

What you typically end up doing is adding a header item such as 'Select Item' as the first String, so that the user has to change selection in order to select "1" .

If you do that remember that the entries are now offset by 1 -- the entry for "1" is at Value 2, the entry for "2" is at Value 3, and so on.

And remember that your processing code has to handle the possibility that later the user will chose to switch back to the header.

... And remember that this does not solve the problem of the user wanting to select the same entry twice in a row -- not unless you reset the Value to 1 (the header)

[venkat ta]

thanks, :)