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Why do the popupmenus/ listbox disappear if i use pushbutton callback ?

Asked by Vasishta Bhargava on 22 Jul 2018
Latest activity Commented on by Image Analyst
on 22 Jul 2018
I have GUI, which has few pushbuttons that loads some data into popupmenus and listbox When I click on pushbutton, to reset the content to empty, it makes the popupmenu /listbox disappear. why does it happen? how can I avoid it ?

  2 Comments

Please do not close questions that have an answer.
Your question is not unclear: you are just asking to do something that cannot be done in MATLAB.
If you're got your answer, and are all done, then you can "Accept" the answer (to give the answerer reputation points and let everyone know it's solved) rather than Close the question.

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1 Answer

Answer by Walter Roberson
on 22 Jul 2018

When you set the String property of the popup or listbox to empty, you need to set the Value property to [] at the same time, or else the Value will be greater than the number of strings and it will consider that an error and refuse to draw the box.

  2 Comments

when I do that I get a warning message Warning: 'popupmenu' control requires a scalar Value. Control will not be rendered until all of its parameter values are valid Still the popupmenus disappear.
Basically, you cannot have an empty popup. You can have an empty listbox though.

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