Get value from popup menu and use it in different function

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Samer Husam
Samer Husam 2012-5-15
评论： Yash Vaid 2019-1-16
Hi; I am doing GUI which has a popup menu that allow the user to choose from several options, lets say I have three options each one has different values for (I,V,P) current, voltage and power. my coding is like this (for example):
function popupmenu1_Callback(hObject, eventdata, handles)
switch get(handles.popupmenu,'Value')
case 1
I=7;
V=20;
p=130;
case 2
I=5;
V=30;
p=170;
otherwise
end
then I need to use these values in some calculation in pushbutton_callback, which it coding as below(for example):
function pushbutton1_Callback(hObject, eventdata, handles)
what code can I use to get these values from the popup menu ?? I need your help please.
  1 个评论
sourabh jain
sourabh jain 2015-6-6
i am tring to use the value of first popupmenu1 in another popupmenu2 but the problem is,it is not updating the value of S (7 20 130). always showing S (5 30 170) how can we use the value of popupmenu1 case 1 i.e I=7; V=20;p=130; in another popupmenu2 case 1,case 2 ... and generate the result and the same case for popmenu1 case 2 value i.e I=5; V=30;p=170; in another popupmenu2 case 1,case 2...and so on and generate the result

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回答（4 个）

Jan
Jan 2012-5-15
Either store the values in the popup's UserData:
function popupmenu1_Callback(hObject, eventdata, handles)
switch get(handles.popupmenu,'Value')
case 1
S.I=7;
S.V=20;
S.p=130;
case 2
S.I=5;
S.V=30;
S.p=170;
otherwise
end
set(handles.popupmenu, 'UserData', S);
Then you can access the values by:
S = get(handles.popupmenu, 'UserData');
Or use the handles struct:
function popupmenu1_Callback(hObject, eventdata, handles)
handles = guidata(hObject); % Update!
switch get(handles.popupmenu,'Value')
case 1
S.I=7;
S.V=20;
S.p=130;
case 2
S.I=5;
S.V=30;
S.p=170;
otherwise
end
handles.S = S;
guidata(hObject, handles); % Update!
  8 个评论
显示 6更早的评论
Atif Rafiq
Atif Rafiq 2015-4-8
Thanks Jam Simon, 1st method worked for me, but to use the variables of popupmenu_callback (i.e S.V, S.P, S.I) in pushbutton_callback I had to use the following commands as well:
V=S.V;
P=S.P;
I=S.I;
but thanks a lot for your answer.
Yash Vaid
Yash Vaid 2019-1-16
If I write
V=S.V;
P=S.P;
I=S.I;
type of code. I get an error 'Dot indexing is not supported for variables of this type.'
Please help me

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sourabh jain
sourabh jain 2015-6-6
编辑：Walter Roberson 2015-6-6
i am tring to use the value of first popupmenu1 in another popupmenu2 but the problem is,it is not updating the value of S (7 20 130). always showing S (5 30 170)
see the code
function popupmenu1_Callback(hObject, eventdata, handles)
switch get(handles.popupmenu,'Value')
case 1
S.I=7;
S.V=20;
S.p=130;
case 2
S.I=5;
S.V=30;
S.p=170;
otherwise
end
set(handles.popupmenu, 'UserData', S);
function popupmenu2_Callback(hObject, eventdata, handles)
switch get(handles.popupmenu,'Value')
case 1
set(handles.popupmenu, 'UserData', S);
i=S.I
v=S.V
p=i*v
case 2
set(handles.popupmenu, 'UserData', S);
i=S.I
v=S.V
p=i*v
otherwise
end
  2 个评论
Image Analyst
Image Analyst 2015-6-6
Then quit referring to "handles.popupmenu" - use either handles.popupmenu1 or handles.popupmenu2, whichever you want.
KALYAN KUMAR
KALYAN KUMAR 2015-7-1
编辑：KALYAN KUMAR 2015-7-1
can you help me on this issue
function popupmenu8_Callback(hObject, eventdata, handles) handles = guidata(hObject); contents = get(handles.popupmenu8,'Value') switch contents case 1
S.M=7;
S.P=20;
case 2
S.M=5;
S.P=30;
otherwise
end
set(handles.popupmenu8, 'UserData', S);
guidata(hObject, handles);

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Walter Roberson
Walter Roberson 2015-6-6
In the second popup you need
S = get(handles.popupmenu, 'UserData')
  1 个评论
KALYAN KUMAR
KALYAN KUMAR 2015-7-1
can u please resolve this issue for me as i have tried the above code i am getting error function popupmenu8_Callback(hObject, eventdata, handles) % hObject handle to popupmenu8 (see GCBO) % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA) handles = guidata(hObject); % Update! contents = get(handles.popupmenu8,'Value') switch contents case 1
S.M=7;
S.P=20;
case 2
S.M=5;
S.P=30;
otherwise
end
%handles.S = S; set(handles.popupmenu8, 'UserData', S); guidata(hObject, handles);

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Deepa AS
Deepa AS 2015-7-29
How should the variable declared in popup menu be called in pushbutton call back function . Can anybody help me out with this? Please.
Thank you Deepa

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