onChanged property

ValueChanged<T?>? onChanged
final

Called when the user selects an item.

If the onChanged callback is null or the list of ComboBox.items is null then the combo box button will be disabled, i.e. its arrow will be displayed in grey and it will not respond to input. A disabled button will display the ComboBox.disabledPlaceholder widget if it is non-null. If ComboBox.disabledPlaceholder is also null but ComboBox.placeholder is non-null, ComboBox.placeholder will instead be displayed.

Implementation

final ValueChanged<T?>? onChanged;