Question

I wonder how to get e.pageX and e.pageY or its analogs on stop event? (in order to show pop up menu for example)

Answer 1

All jQueryUI events provide event as a callback argument

$( ".selector" ).selectable({
   stop: function(event, ui) {
       alert( event.pageX) ;
   }
});

Good learning trick with jQueryUI is to log event and ui to console on a few events. Especially ui. Gives you a good feel for what is available to work with