Callback function not found for dynamically created app UI component
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I would like to dynamically/programmtically create a uidropdown component that calls a function when its value is changed. However, even though I provide a function handle as the ValueChangedFcn property, the uidropdown is unable to find the function. I receive the error below.
Undefined function 'DropDownChange' for input arguments of type 'matlab.ui.control.DropDown'.
Error using matlab.ui.control.internal.controller.ComponentController/executeUserCallback (line 305)
Error while evaluating DropDown PrivateValueChangedFcn
I am attaching a simple app created in R2016b that exhibits this behavior. Why can't the function be found? How should I define it to resolve the issue?
More Answers (2)
Jan on 20 Mar 2021
Edited: Jan on 20 Mar 2021
As far as I can see, Matlab searchs for a matching function with the input (app, event), but your callback accepts (app) only. So try to append a 2nd (unused...) input to your CropDownChange function.
[EDITED] No, this does not work.
Bear on 15 Nov 2021
I have a similar issue.
I'm creating a submenu voice with a file path and I want to associate a function. The idea is the add a voice every time the user selects a directory in order to have a history of selected folders.
I would like to catch also the event when the user selects a folder in order to retrieve the selected path and move to that folder.
mitem = uimenu(app.RecentpathsMenu,"Text",user_dir,"MenuSelectedFcn",@(~,~)app.ChangePath);
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