drag and drop to a list but drop on a item of this list

Webix JS
1

I have a ui.list and i want to drop an objet on a item of this list (not to add an item to this list). Each item is a kind of basket. I’m looking for the index (or id) of the item (target) i drag on to drop.
And how can i change the background of the dragover item ?

2

please ignore this. I think it works…