Add 2 numbers in MATLAB, answer to appear in edit text box moment, the numbers are entered in 2 text boxes, without using pushbutton

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Avinav Kumar
Avinav Kumar 2021-3-14
评论： Avinav Kumar 2021-3-14
I am trying to get value in edit3 textbox without using pushbutton
function edit3_Callback(hObject, eventdata, handles)
% hObject handle to edit3 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
% Hints: get(hObject,'String') returns contents of edit3 as text
% str2double(get(hObject,'String')) returns contents of edit3 as a double
a = str2num(get(handles.edit1,'String'));
b = str2num(get(handles.edit2,'String'));
c = a + b;
set(handles.edit3,'String',num2str(c));

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Walter Roberson
Walter Roberson 2021-3-14
编辑：Walter Roberson 2021-3-14
Create the same Callback property for both edit boxes https://www.mathworks.com/help/matlab/ref/matlab.ui.control.uicontrol-properties.html#bt6ck7c-1-Callback
function edit2_Callback(hObject, eventdata, handles)
a = str2double(get(handles.edit1,'String'));
b = str2double(get(handles.edit2,'String'));
if isnan(a) || isnan(b) %empty or not number
return;
end
c = a + b;
set(handles.edit3,'String',num2str(c));
end
This callback will be invoked without needing a pushbutton. It does, however, require that the user presses Return in the edit box, or that the user clicks outside the edit box after having entered text in the box.
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