How to enable and disable edit text box from a check box?

I'm trying to enable and disable editable text box from a checkbox. The ideia is: when checkbox is checked the editable text box must be enable and when not checked it must be disable. My code works well when the editable text box is empty, however, if I type any value in the textbox, when I press the checkbox I get an error.

Error while evaluating uicontrol Callback

Error using handle.handle/set
Invalid or deleted object.

Error in OC_SST>check_min_val_cut_Callback (line 1625)
      set(handles.min_val_cut,'enable','on');

Error in gui_mainfcn (line 96)
      feval(varargin{:});

Error in OC_SST (line 42)
  gui_mainfcn(gui_State, varargin{:});

Error in @(hObject,eventdata)OC_SST('check_min_val_cut_Callback',hObject,eventdata,guidata(hObject))

My code is:

%check box function
function check_min_val_cut_Callback(hObject, eventdata, handles)
  tmp = get(hObject,'Value');
  if tmp 
      handles.check_min_val_cut = tmp;
      set(handles.min_val_cut,'enable','on'); %editable textbox turns on
  else
      handles.check_min_val_cut = 0;
      set(handles.min_val_cut,'enable','off'); %editable textbox turns off
  end
guidata(hObject,handles);

%edit text box function
function min_val_cut_Callback(hObject, eventdata, handles)
  handles.min_val_cut = str2double(get(hObject,'String'));
guidata(hObject,handles);

Could anyone help me?

Thank you in advance.

Fabio

Answer 1

[Image Analyst]

Why are you doing this:

handles.check_min_val_cut = 0;

???? You're blowing away the handle ID of your checkbox by setting the ID number equal to it's check value? Why would you do that? Let's say that handles.check_min_val_cut was 78.1435, and now you're going to set it to true or false, essentially breaking the connection between your handle structure and your checkbox. What was your intent with those lines? What did you want to do or think you were going to do when you put them in there?

[Fabio]

The problem it is not with the checkbox. The checkbox works ok.

the following line: tmp = get(hObject,'Value'); gets the status of the checkbox and return 1 when checked and 0 otherwise. So, I define handles.check_min_val_cut = tmp; (1 or 0), and this part of the code works ok.

The problem occurs when I try to enable or disable the editable text box.

set(handles.min_val_cut,'enable','on')

or

set(handles.min_val_cut,'enable','off')

For simplicity you can consider the following code:

%check box function

function check_min_val_cut_Callback(hObject, eventdata, handles)

tmp = get(hObject,'Value');
if tmp 
   set(handles.min_val_cut,'enable','on'); %editable textbox turns on
else
   set(handles.min_val_cut,'enable','off'); %editable textbox turns off
end
guidata(hObject,handles);

%edit text box function

function min_val_cut_Callback(hObject, eventdata, handles)

handles.min_val_cut = str2double(get(hObject,'String'));
guidata(hObject,handles);

In previous code I saved the checkbox status because I need its status in other part of the program.

[Image Analyst]

"So, I define handles.check_min_val_cut = tmp" <- and that's your mistake. Don't do that.

Your simplified code looks like it should work, as long as the edit box's tag is "min_val_cut".

[Fabio]

No! There is no problem with the checkBOX! The checkbox works ok. The problem is when I try to enable a EDIT TEXT BOX from that checkBOX. Look at the above code. The function associated to the checkBOX is called check_min_val_cut_ Callback(hObject, eventdata, handles) and the function associated to the EDIT TEXT BOX is called min_val_cut_ Callback(hObject, eventdata, handles). So, again, if the checkbox is checked the EDIT TEXT BOX must become editable, otherwise the EDIT TEXT BOX must become not editable.

Answer 2

[houda]

Hi, I am facing the same problem, did anyone find the solution ? Thanks !

[Image Analyst]

He said he had a callback function for the edit field called min_val_cut_ Callback(). This means that the tag for the edit field was min_val_cut. He then had a line

handles.min_val_cut = str2double(get(hObject,'String'));

This blew away the handle for the edit field, making it no longer able to be accessed. To fix: Do not have a variable with the same name as the tag of a uicontrol, min_val_cut in his case.