Is the term "scroll bar" really accurate? I want to create a scrollable feature where users can easily select a city using their mouse wheel (or swipe on a smartphone) and then choose from possible cities within that country in a second window. Something similar may have been done before, but I haven't found a good example yet.
https://i.sstatic.net/7Dggo.jpg
Does anyone know the specific name for this functionality and possibly have sample code?