How to automatically update the value in a string in an edit box with a value in another edit box but still allow the user to overwrite this value?

I have a gui guide where I ask the user if it knows a value (number) in an edit box.

If the user knows this value I want the value in another edit box to automatically update. However, I want the user to be able to update/overwrite the value in the second edit box.

Any help is welcome. Thanks in advance.

[Rik]

For general advice and examples for how to create a GUI (and avoid using GUIDE), have look at this thread.

You will need to rely on the user to trigger a callback after filling the edit box and/or use a timer to perdiodically check the first box for changes.

[Maria]

Thanks for the comment. However, we have an already working guide...

[Rik]

Then it should be easy to generate the code and clean up the mess that GUIDE made, after which you no longer rely on a fragile system with two separate files, one of which easily breaks when edited in a wrong version of Matlab.

But the second part of my comment should still be worth a try regardless.

Answer 1

[Jan]

Without GUIDE but a working demonstration:

handles.FigH  = figure;
handles.Edit1 = uicontrol('Style', 'Edit', ...
   'Units', 'Normalized', ...
   'Position', [0.1, 0.55, 0.8, 0.4], ...
   'Callback', @Edit1CB);
handles.Edit2 = uicontrol('Style', 'Edit', ...
   'Units', 'Normalized', ...
   'Position', [0.1, 0.05, 0.8, 0.4]);
guidata(handles.FigH, handles);

function Edit1CB(Edit1, EventData)
handles = guidata(Edit1);
set(handles.Edit2, 'String', get(Edit1, 'String'));
end

The callback of the first edit field copies its contents to the second one, but you can still edit the second one manually.

In your GUIDE code you omit the explicit guidata() calls. Insert the corresponding Callback to the first edit field.