Check if target area is visible when scrolled From http://stackoverflow.com/questions/7182342/how-to-detect-when-the-user-has-scrolled-to-a-certain-area-on-the-page-using-jqu
// CHECK IF TARGET AREA IS VISIBLE WHEN SCROLLED
function isScrolledIntoView(elem)
{
var docViewTop = $(window).scrollTop();
var docViewBottom = docViewTop + $(window).height();
var elemTop = $(elem).offset().top;
var elemBottom = elemTop + $(elem).height();
return ((elemBottom >= docViewTop) && (elemTop <= docViewBottom) && (elemBottom <= docViewBottom) && (elemTop >= docViewTop));
}
// UPDATE OR REFERENCE ID "theTarget"
$(window).scroll(function() {
if(isScrolledIntoView($('#theTarget')))
{
alert('visible');
}
});