Guide: alphabet and symbols

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

Answer 1

[Oleg Komarov]

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

[john]

Hi, about your code: If I write symbol "_", then is enable on. Could you change your code, to code if I write symbol "_", then is enable off.

Please, can you expand your code,... if I write symbol dot "." or any letter from alphabet, then is enable on.

[Oleg Komarov]

Is the set '[A-z0-9.]' what you need? (where '-' means 'to')

It reads the set composed by all the letters from 'A to Z' and 'a to z' and all the numbers from '0 to 9' and the '.'

What would you use this set for? Creating names for variables? (just a guess)

[john]

Yes, for variables.

Do you mean '[A-z0-9.]' or '[^A-z0-9.]'. I think it works with '[^A-z0-9.]'

[Walter Roberson]

[A-z] includes some characters that are not in 'A' to Z' or 'a' to 'z'. In particular, it includes [\]^_` between the two alphabetic ranges. The upper-case letters are not immediately beside the lower-case letters in the charts.

[Oleg Komarov]

It works with '[^A-z09.]' since it checks for characters outside the permitted set to disable the button.

Be careful, '.' is used to access structure fields.

[Walter Roberson]

The user wants the control disabled if [ or ] or \ or ^ or _ or ` are pressed, but that pattern will permit those characters.

[^A-Za-z0-9.]

[john]

this is my code:

if any(regexp(char(get(handles.edit,'String')),'[^a-zA-Z0-9.]'));

set(handles.edit,'String','Error');

set(handles.pushbutton4,'enable','off');

else

set(handles.pushbutton4,'enable','on');

end;

[Walter Roberson]

I think I would have used ismember:

T = char(get(handles.edit, 'String'));

if ~all(ismember(T(:), ['a':'z', 'A':'Z', '0':'9', '.', ' '])

<error>

This formulation does, though, require the introduction of the bogus space, since char() of a cell array pads end of lines with spaces.

[john]

Hi Oleg,

I made copy of you code to me GUI code

function varargout = menu_OutputFcn(hObject, eventdata, handles)

varargout{1} = handles.output;

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

.

.

.

.

.But I got error: " ??? Undefined variable "S" or class "S.ed.getText".

Error in ==> menu>ed_krc at 107

if any(regexp(char(S.ed.getText),'\W+'))".

.

.

.where is the problem?

[Walter Roberson]

Use nested functions.

function varargout = menu_OutputFcn(hObject, eventdata, handles)

S.ed = javax.swing.JTextField(); %must initialize S before defining ed_krc

[...]

function ed_krc(varargin)

[...]

end %of ed_krc

end %of menu_OutputFcn

so ed_krc is defined entirely within the menu function; it can then share variables with it under some circumstances.

[Oleg Komarov]

Otherwise ou have to change:

...

set(S.ed, 'KeyReleasedCallback', {@ed_krc,S});

end

function ed_krc(varargin)

S = varargin{end};

...

end

[john]

I don't understand. Java code is located between line 87 - 111. I added "end end", but I got error .

.

.

"??? Error: File: menu.m Line: 695 Column: 1

Unexpected MATLAB operator."

And on the line 695 is :"function edit9_Callback(hObject, eventdata, handles)"

[Oleg Komarov]

Example with subfunctions:

function mainGUI

end

function callback

end

Example with nested functions

function mainGUI

function callback

end

end

[john]

Hi, can I define typ of the number? if permissible numbers are: 4,3 or 3*10^3 or 4.3*10^(-4) or 3.5e2 or 4.6e(-2).

.

.

all others are not permissible.

.

.

if any(regexp(char(get(handles.edit7,'String')),'[^0-9.*^()-]'))

set(handles.edit,'String','Error');

else

set(handles.edit, 'String','OK');

end;