I think I figured out what's happening. It appears that entering data into the GUI object has no immediate effect. However, there's a button that reads the contents of a bunch of these objects and takes action accordingly. It seems slightly backwards to me, but maybe it's OK?
GUI callbacks empty?
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I inherited a GUI from an ex-colleague. It was made with GUIDE and has 30 or so items, including a lot of boxes to enter numbers. This is my first foray into GUI programming (in any language), and I thought I was getting the hang of it until I realized that many of the callbacks contain no code. Is it possible that there's some other magic code getting executed somewhere that I can't see?
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Walter Roberson
le 6 Jan 2022
There is certainly merit to having GUIs do field validation upon entering information -- verifying that a numeric field is convertable to a number for example.
The newer App Designer numeric edit fields are inherently for numeric values, and so reduce the need for validation.
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