I know that the jscrollpane fires a function when "isAtBottom" finally becomes true.
But what is the name of this function respectively how can I check if "isAtBottom" finally becomes true?
jScrollPane doesn't fire a function for that condition, it fires an event. You can bind to the event the same way you'd bind to any other jQuery event:
$('.your-scroll-pane').bind(
'jsp-arrow-change',
function(event, isAtTop, isAtBottom, isAtLeft, isAtRight) {
// Now look at the is* parameters and do what you
// need to do. All four of the is* parameters are
// booleans.
}
);