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How to modified "edit fied (text)" from app design

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I need that the ''edit field text'', in my app, is limited to a maximum of 20 characters and a pop-up error message that appears if you enter more than 20 characters.
How could i do?

Accepted Answer

Mario Malic
Mario Malic on 7 Sep 2020
Edited: Mario Malic on 12 Sep 2020
Add this to the value changed callback, adjust the name of your field.
if length(app.EditField.Value) <= 20
Text = app.EditField.Value; % If you will use the text
else
% app.EditField.Value = ''; % you can clear out the text if needed
f = uifigure;
Error_Msg = "Error message"
Error_Title = "Error title";
uialert(f, Error_Msg, Error_Title,'CloseFcn',@(h,e) close(f));
end
It takes a little bit of time to display the message, if that is an issue, then you can use tooltip, I have no example with tooltip.
Above portion of code creates a new figure which takes a bit of time. Here's a better solution with help from Adam.
if length(app.EditField.Value) <= 20
Text = app.EditField.Value; % If you will use the text
else
% app.EditField.Value = ''; % you can clear out the text if needed
f = app.UIFigure; % f is handle to your app UI figure
Error_Msg = "Error message"
Error_Title = "Error title";
uialert(f, Error_Msg, Error_Title);
end
  2 Comments
Palma Errico
Palma Errico on 13 Sep 2020
@Mario Malic yes I had already made this change to my app, because I realized that the error message was slow. Your help on setting up the code was crucial though. Thanks again!

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