MATLAB: How to use uicontrol and callback for a user-defined input flow

callbackguiuicontrol

I have being dealing with the following problem: in a GUI, user enters a number N. That creates two sets of N popupmenus. popup1 controls popup2: Let's say popup1 has options '1', '2' and '3'. If option '1' in popup1 is selected, popup2 menu should be 'A', 'B' and 'C', if '2' is selected in popup1, popup2 should be 'M', 'N' and 'P' and if option '3' is selected in popup1, popup2 should be 'X', 'Y' and 'Z'.

I have tried to use uicontrol and callback, and it creates the popups. The problem is that I don't know how to access the variables inside the popups. Does anyone know how to do this?

Best Answer

In the callback of popup1, you just want to modify the string in popup2.

I guess you need something like :

function popup1_callback(hObject,eventdata,handles)
Value1 = get(handles.popup1,'Value');
if Value1==1
    List = {'A';'B';'C'};
elseif Value1==2
    List = {'M';'N';'P'};
else
    List = {'X';'Y';'Z'};
end
set(handles.popup2,'String',List);

Related Solutions

MATLAB: Linking a pushbutton to two dropdown menus in GUIDE

vedesh - in the pushbutton callback, you would use the handles structure to get the selections from the two dropdown menus. Your code could look something like the following

function pushbutton1_Callback(hObject, eventdata, handles) 
% get the selection from the first drop down menu
popup1List = get(handles.popup1,'String'); % get the list of items of popup1
popup1Index = get(handles.popup1,'Value'); % get the index of the selected item of popup1
popup1Value = popup1List{idx};             % get the value of the selected item of popup1
% get the selection from the second drop down menu
popup2List = get(handles.popup2,'String'); % get the list of items of popup2
popup2Index = get(handles.popup2,'Value'); % get the index of the selected item of popup2
popup2Value = popup2List{idx};             % get the value of the selected item of popup2
% note that popup1Value and popup2Value are strings so you may need to convert to numbers is
% applicable
% do whatever work you need to and draw line on axes

MATLAB: Create a popup menu based on dynamic data

Hi I spoke to someone and eventually figured it out so thank for your reply anyway. The data is stored in a cell array and i had a push button to select the data. But the problem was in defining the string to be used and not putting the correct thing in the callback part of the code. The code below is what seems to work.

% --- Executes on button press in pushbutton3.
function pushbutton3_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton3 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB


% handles    structure with handles and user data (see GUIDATA)

% Extract curve information
ci = handles.wlog.curve_info(2:end, 1);
handles.ci = ci;
% Update handles structure
guidata(handles.figure1, handles);
% Set popupmenu1 string for list
set(handles.popupmenu1,'string',ci)
% --- Executes on selection change in popupmenu1.
function popupmenu1_Callback(hObject, eventdata, handles)
% hObject    handle to popupmenu1 (see GCBO)

% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
% Hints: contents = cellstr(get(hObject,'String')) returns popupmenu1 contents as cell array
%        contents{get(hObject,'Value')} returns selected item from popupmenu1
%data = evalin('base','ci');
data = guidata(handles.figure1);
set(hObject, 'String', data.handles.ci)
% --- Executes during object creation, after setting all properties.
function popupmenu1_CreateFcn(hObject, eventdata, handles)
% hObject    handle to popupmenu1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called
% Hint: popupmenu controls usually have a white background on Windows.
%       See ISPC and COMPUTER.
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor','white');
end

Best Answer

Related Solutions

MATLAB: Linking a pushbutton to two dropdown menus in GUIDE

MATLAB: Create a popup menu based on dynamic data

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