use of dropdownlist code

I have this code.

S={'NH4Cl'; 'MgCl2'; 'CaCl2'; 'KCl'; 'ZnSO4'; 'NaCl'; 'ZnBr2'; 'CH3CO2K';'HCOOK';'HCOONa'; 'CaBr2'};

str={'Choose minimum two salts and maximum three salts available'};

result=listdlg('Promptstring',str, 'ListSize', [100,100], 'ListString', S, 'SelectionMode', 'multiple');

% As I dont want the user to select all salts, I dont want the 'select all' option to come up on the screen. What version of this code can I use so that option doesnt come up..

[Voss]

Consider the fact that if they are allowed to select more than one item, then they can select all the items, regardless of whether there is a button to do so or not.

[Muazma Ali]

But I have written it in the headline that they either have to sekect two or three. You mean I shd make an if statement for instance , where I say incorrect nr of salts are chosen?

[Voss]

Yes, I think that is what you have to do. As far as I know you cannot control how many items are selected (beyond specifying whether only one or more than one is allowed) using listdlg. So you would either have to (1) write your own listdlg-type function that constrains the number of items selected, or (2) check how many items were selected in listdlg and throw an error or otherwise handle the case when an incorrect number were selected.

[Image Analyst]

@Muazma Ali did you overlook my Answer below in the official "Answers" section? Anything wrong with that?

[Muazma Ali]

No, I saw it for a few min ago. Probably nothing wrong with it, I have just not tried to implement it yet..

Answer 1

[Image Analyst]

I don't see anyway to get rid of hte Select All unless you write your own custom GUI for it. But you can loop until they choose 2 or 3 items:

numSelected = 0;
choices = {'NH4Cl'; 'MgCl2'; 'CaCl2'; 'KCl'; 'ZnSO4'; 'NaCl'; 'ZnBr2'; 'CH3CO2K'; 'HCOOK';'HCOONa'; 'CaBr2'};
promptString = {'Choose salts available (minimum of two and maximum of three)'};
while numSelected < 2 || numSelected > 3
    result = listdlg('Promptstring',promptString, 'ListSize', [350,200], 'ListString', choices, 'SelectionMode', 'multiple');
    numSelected = length(result);
    if isempty(result)
        % User clicked cancel.  Decide what to do in this case after we exit the loop.
        break;
    end
    if numSelected < 2 || numSelected > 3
        warningMessage = 'Please select only 2 or 3 items';
        uiwait(warndlg(warningMessage));
    end
end
if isempty(result)
    return; % Exit the whole program.
end