angularjs infinite scroll directive

gistfile1.js

var mod = angular.module('ng-infinite', []);
mod.directive('ngInfinite', [ '$window', '$timeout', function($window, $timeout) {
	return {
		link : function(scope, elem, attrs) {
			scope.$on('$destroy', function() {
				return container.off('scroll', handler);
			});
			var calculate = function() {
				var body = $('body');
				var clientHeight = document.documentElement.clientHeight;
				var scrollTop = body.scrollTop();
				var height = body.height();
				var marginTop = parseInt(body.css('margin-top'));
				var paddingTop = parseInt(body.css('padding-top'));
				
				if (clientHeight + scrollTop - height - marginTop - paddingTop === 0) {
					return true;
				} else if (body.height() <= clientHeight) {
					return true;
				}
				return false;
			}
		    var predict = function() {
				if (calculate() && !scope.$$phase) {
					scope.$apply(attrs.ngInfinite);
				}
			}
			return setInterval(function() {
				predict();
			}, 1000);
		}
	}
} ]);