Enhanced isScrolledIntoView

gistfile1.js

$.fn.isInViewport = function(containerSelector, partial) {
	var $element = this;
	
	if($element.length) {
		var el = $element[0];
		var rect = el.getBoundingClientRect();
		
		if(containerSelector && $(containerSelector).length) {
			var parentRect = $(containerSelector)[0].getBoundingClientRect();
		} else {
			var parentRect = {top: 0, left: 0, bottom: $(window).height(), right: $(window).width()};
		}
		
		if(partial) {
			return (
				rect.left >= parentRect.left &&
				rect.right <= parentRect.right &&
				( 
				(rect.top >= parentRect.top && rect.top <= parentRect.bottom) ||
				(rect.bottom >= parentRect.top && rect.bottom <= parentRect.bottom)
				)
			);
		} else {
			return (
				rect.top >= parentRect.top &&
				rect.left >= parentRect.left &&
				rect.bottom <= parentRect.bottom &&
				rect.right <= parentRect.right
			);
		}
	}
}