MATLAB: Guide: alphabet and symbols

alphabetjavajavacomponentjtextfieldswingsymbols

Hi,

I have edittext and pushbutton.

If I write any letter from alphabet {a,A,b,B,c,C…..y,Y,z,Z}, then I want to enable pushbutton.

If I write any other symbols for example {" ? * & # !}, then I want to disable pushbutton.

Please, how Can I do this? . It is any different between alphabet a,b,c,d and symbols?.

Thank you

Best Answer

Try this GUI

function myGUI
  % Create figure
  S.fh = figure('units','pixels',...
                'position',[500 500 200 100],...
                'menubar','none',...
                'name','myGUI',...
                'numbertitle','off',...
                'resize','off');
    % Create java edit text box
    % I avoid he MATLAB uicontrol because the KeyPressFunction has a bug which
    % doesn't update in real time the string 
    S.ed = javax.swing.JTextField();
    S.ed.setHorizontalAlignment(javax.swing.JTextField.CENTER)
    javacomponent(S.ed, [10 60 180 35]);
    % Create push button
    S.pb = uicontrol('style','push',...
                     'units','pix',...
                     'position',[10 10 180 40],...
                     'fontsize',14,...
                     'string','Do smt');
    % Add check of the string in the edit text box
    set(S.ed, 'KeyReleasedCallback', @ed_krc);
      function ed_krc(varargin)
          % If the string contains symbols
          if any(regexp(char(S.ed.getText),'\W+'))
              % Disable push button
              set(S.pb,'Enable','off')
          else
              % Otherwise enable it
              set(S.pb,'Enable','on')
          end
      end
  end

Why I use java edit text box: http://www.mathworks.com/matlabcentral/newsreader/view_thread/151905

Related Solutions

MATLAB: How to make a push button that will change its text when I click on it

In order to cyclically change the text string on the push button, you need to determine what the current 'String' property value is, and set it to the other value.

Below is an example of a push button that switches the push button's String between ''Pause" and ''Resume" :

function Test_Button(hObject, eventdata, handles, varargin)
%Create the GUI
Fig = figure;
% Create the Push button using uicontrol, using callback function push_Callback, initially the text displayed for the button is "Pause"
PushCtrl = uicontrol( Fig,'Style' ,'pushbutton',...
                            'String', 'Pause',...
                            'Position', [20 20 100 60],...
                            'Callback', @push_Callback);
% Create the handles structure
handles = guihandles(Fig);
handles.strings = {'Pause';'Resume'};
% Save the handles structure to the fig file
guidata(Fig, handles);
%%This function checks the current string of push button and changes it.
function varargout = push_Callback(h, eventdata)
% Get the handles structure
handles = guidata(h);
% Get the current string
str = get(h,'String');
% See which string the current string matches with
ind = find(strcmp(str,handles.strings));
% Switch to the other string
if ind == 1
      set(h,'String',handles.strings{2});
else
      set(h,'String',handles.strings{1});
end

MATLAB: How to change a string field in an edit text box using a pop-up menu

I found it! the code should be in the Callback function not in the CreateFcn of the pop-up menu. Thanks

Best Answer

Related Solutions

MATLAB: How to make a push button that will change its text when I click on it

MATLAB: How to change a string field in an edit text box using a pop-up menu

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