I am trying to display a table summary row containing the total number of elements and the the number of selected items if appropriate.
No Items selected: "324 entries"
3 Items selected: "324 entries, 3 selected"
The number of items is straightforward and works but I am unable to display the number of selected items. I tried to create a custom summary and also to override the summary renderer, both without success. Can you point me to a direction how to achieve what I want?