Returns whether this event is
onChanging
, and caused by
user's selecting a list of predefined values (a.k.a., items).
It is always false if it is caused by the onChange
event.
Currently, only combobox might set it to true for the onChanging
event. It is useful when you implement autocomplete.
To have better response, you usually don't filter out unmatched items
if this method returns true. In other words, you simply ignore
the onChanging
event if this method return true, when
implementing autocomplete.