App Designer : Text field making visible and invisible when select and re-select same option from drop down menu

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I am trying to make a text field visble when I select an option form the drop down and when I re-select that option, I want to make that text field hide. Please suggest me how to do this using drop dwon.


Mario Malic
Mario Malic 2020 年 9 月 13 日
編集済み: Mario Malic 2020 年 9 月 13 日
You can create a property called
Last_Selection = '';
In the DropDownMenu callback
function DropDownValueChanged(app,event)
if isempty(app.Last_Selection)
app.Last_Selection = app.DropDownMenu.Value % Initialises Last_Selection on first callback
if isequal(app.Last_Selection, app.DropDownMenu.Value)
% Hide something
% I am not sure how it goes with hiding/removing dropdown values
% First you have to assign to some other dropdown value and then remove it
% if you don't want errors
% ind = find (app.DropDownMenu.Value == app.DropDownMenu.Items); % get index of data to be removed
% app.DropDownMenu.Value = change_to_other_value
% app.DropDownMenu.Items{1,ind} = ''; % Test if it actually works
app.Last_Selection = app.DropDownMenu.Value
The question is, does the callback gets executed if the DropDownMenu.Value stays the same?
It might be more intuitive to the user what to do to remove the dropdown value, by adding the button instead.

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