May seem odd to check if the page scroll is at bottom, but can be useful if you need to hide something or show something else, as in a back to top button for example.
$('#back-to-top').hide(); $(window).scroll(function(){ if ( document.body.scrollHeight - $(this).scrollTop() <= $(this).height() ){ $('#back-to-top').show(); } else { $('#back-to-top').hide(); } });