How do I change the options in a dropdown menu after a button is pressed in app designer?

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Carson 2023-3-16

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回答： Jinal 2023-3-16

To keep this short:

I have a dropdown menu with 7 options, and a button. In the buttons callback function I want to be able to remove some of the options to reduce the number of options to say 5.

How can I do this?

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Answer 1

Jinal 2023-3-16

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Hi Carson,

As per my understanding you wish to use the button you have created to reduce the number of available options in your dropdown menu.

You can do this using the following as the body of your button’s callback function.

app.DropDown.Items = {'Option 1', 'Option 2', 'Option 3','Option 4', 'Option 5'};

If you are using a state button, the callback function’s body would would look like following:

value = app.Button1.Value;
if value == 1
    app.DropDown.Items = {'Option 1', 'Option 2', 'Option 3','Option 4', 'Option 5'};
else
    app.DropDown.Items = {''Option 1', 'Option 2', 'Option 3','Option 4', 'Option 5', Option 6', 'Option 7'};
end