The DropDownList widget is designed to infer the data from the SELECT options and to create data items persisted in the widget's data source
. Currently, data attributes are ignored when widget infers data from the SELECT options. Note also, that widget recreates the option elements of the widget on init even when the element is defined declaratively. You can overcome this behavior if you define the data source of the widget instead of using a SELECT element with options. Check this demo
for more information.
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