List box items

How can i check if the new item which i want to add to list box if it is exist or not

i write this code but it is not working

[filename, pathname] = uigetfile( ...
  {'*.m', 'All matlab-Files (*.m)'; ...
      '*.*','All Files (*.*)'}, ...
  'Select Matlab File');
file = fullfile(pathname,filename);
filename = filename(1:end-2);
currentItems = get(handles.listbox1, 'String');
if pathname == 0
  return
else
for n = 1:length(newItems)

    if filename == currentItems(n);
        uiwait(msgbox('The algorithm you select are exist! Please selesct another.','Error','modal'));
        [filename, pathname] = uigetfile( ...
    {'*.m', 'All matlab-Files (*.m)'; ...
        '*.*','All Files (*.*)'}, ...
    'Select Matlab File');
file = fullfile(pathname,filename);
filename = filename(1:end-2);
    end
end
end

         currentItems{end+1} = filename;
set(handles.listbox1,'String',currentItems);

Answer 1

[Image Analyst]

Try using strcmpi(filename, currentItems(n))>0 instead of "filename == currentItems(n);"

Also, you need to set a flag for whether you should add the name. Currently you call currentItems{end+1} = filename; regardless if it's on the list already or not.

Answer 2

[Aldin]

All your Items which you have in listbox put in an array then with for loop check if your item for adding is in listbox For example if you have in listbox: 'Aldin' 'Amani' 'Image' 'Spike' put all these names in an array like this:

array = ['Aldin','Amani','Image','Spike'];

than check with for loop: (guess your name for adding in list box is 'Ricky'):

    for i = 1:length(array) 
    if strcmp(array(i),'Ricky')
    disp('Ricky is in listbox') 
    else 
    disp('Ricky is not in listbox'); 
    end 
  end