How to check if the cursor is over an element? [duplicate]

Answer 1

For the sake of completeness I will add a couple of changes that I believe will help a bit for performance.

1. Use delegation to bind the event to one element, instead of binding it to all existent elements.

   $(document).on({
     mouseenter: function(evt) {
       $(evt.target).data('hovering', true);
     },
     mouseleave: function(evt) {
       $(evt.target).data('hovering', false);
     }
   }, "*");
   

2. Add a jQuery pseudo-expression :hovering.

   jQuery.expr[":"].hovering = function(elem) {
     return $(elem).data('hovering') ? true : false; 
   };
   

Usage:

var isHovering = $('#someDiv').is(":hovering");