MATLAB: How to get the value from the checboxes after push a Button

MATLABmatlab gui

Hi guys, i have a guide, that creates a several checkboxes and a Pushbutton "enter" in the dialog box. What i want is, when i choose one of the checkboxes and then push the button "enter", the state of the checkbox, that i have chosen, should be saved in the variable "checkboxValues" and the dialog box should be closed. You can see my code, it doesn't work and showed me an error. How can i solve this problem? Thanks!

handles.figure = dialog('position',[56 224 150 155]);

handles.label={'True Positiv' 'True Negative' 'False Negative' 'Irrelevant'};

for k=1:4

    h_checkbox(k) = uicontrol(handles.figure , 'Style','checkbox','String',handles.label(k), ...
                              'Position',[10 30*k 110 20]);
end

h.p = uicontrol(handles.figure ,'style','pushbutton','units','pixels',… 'position',[30 5 90 20],'string','OK',… 'callback',@enter_call);

function enter_call(hObject, eventdata, handles)

hCheckboxes = findobj(handles.figure, 'Style', 'checkbox');

checkboxValues = get(hCheckboxes, 'Value');

close(gcbf)

Best Answer

Hi Ma Le Thai,

Hope my solution help you

clear all
close all
% Create figure & its components
figure = dialog('position',[56 224 150 155]);
handles.label={'True Positiv' 'True Negative' 'False Negative' 'Irrelevant'};
for k=1:4
      handles.h_checkbox(k) = uicontrol(figure , 'Style','checkbox','String',handles.label(k), ...
                              'Position',[10 30*k 110 20]);
end 
handles.push = uicontrol(figure ,'style','pushbutton','units','pixels',... 
    'position',[30 5 90 20],'string','OK');
set(handles.push,'callback',@enter_call);
guidata(figure,handles);
% Call back function
function enter_call(hObject, eventdata, handles)
handles = guidata(hObject);
checkboxValues = get(handles.h_checkbox, 'Value')
close(gcf)
end

As per my knowledge, guide does not pass handles automatically, therefore, we have to save the handle in the startup and then load the handle in the callback. I'm not sure others have better explanation for it or not.

Related Solutions

MATLAB: GUI Edit Text Box Value Check

You can insert the check in the callbacks of the first 4 edit fields. The callbacks can check the validity of the contents at first:

% In the OpeningFcn:  [EDITED, was CreateFcn]
handles.EditOk = false(1, 4);
set(handles.Edit5, 'Enable', 'off');
...
guidata(ObjectH, handles);  % [EDITED] Store handles in the figure

function Edit1_Callback(ObjectH, EventData)
handles = guidata(ObjectH);
Str     = get(ObjectH, 'String');
Value   = sscanf(Str, '%f', 1);
if ~isempty(Value) && ~isnan(Value)
  StrNew  = sprintf('%.8g', Value);   % In the wanted format
  if ~strcmp(Str, StrNew)
    set(ObjectH, 'String', StrNew);
    % Perhaps a warning message?
  end
  handles.EditOk(1) = true;
else
  handles.EditOk(1) = false;
end
if all(handles.EditOk)
  set(handles.Edit5, 'Enable', 'on');
else
  set(handles.Edit5, 'Enable', 'off');
end
guidata(ObjectH, handles);  % [EDITED] Store handles in the figure

The same can be applied in all 4 edit fields - or you can use the same callback for all fields and some further trick to identify the index of the edit box.

Now the 5th edit field is activated only if the 4 edit boxes contain valid values.

MATLAB: How to create a checkbox in a new figure and control it from a GUI

http://matlab.wikia.com/wiki/FAQ#How_can_I_share_data_between_callback_functions_in_my_GUI.28s.29.3F

One way:

h.f = figure('units','pixels','position',[200,200,150,50],...
             'toolbar','none','menu','none');
% Create yes/no checkboxes
h.c(1) = uicontrol('style','checkbox','units','pixels',...
                'position',[10,30,50,15],'string','yes');
h.c(2) = uicontrol('style','checkbox','units','pixels',...
                'position',[90,30,50,15],'string','no');    
% Create OK pushbutton   
h.p = uicontrol('style','pushbutton','units','pixels',...
                'position',[40,5,70,20],'string','OK');
set(h.p, 'callback', @(src, event) p_call(src, event, h));

with

      % Pushbutton callback
      function p_call(src, event, h)
          vals = get(h.c,'Value');
          checked = find([vals{:}]);
          if isempty(checked)
              checked = 'none';
          end
          disp(checked)
      end

The h that will be passed to the callback will be a copy of the h as it existed at the time the callback was created. That is why I split it up into creation of a control and setting the callback -- in that way, h.p is populated before a copy of h is taken for the callback. If you combine them the way you had done, the h that would be passed in would be the version from before h.p had been assigned to.

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