Currently only Microflows are supported for Events on input elements (on change, on enter, on leave). It would be logical to have an option to choose Nanoflows for these events, too.
A pop-up window is opened which contains a dropdown. The dropdown controls an attribute of a non-persistent page-parameter object. Changing a value in the dropdown, automatically updates the content on the page. So it would make sense to be able to link a nanoflow to the on-change event, to close the pop-up when the user selects a new value for the filter.