In-page nav, with smooth scrolling, update on scroll, and proper location.hash updating

In-Page Nav Functions.js

$(document).ready(function() {
    
    $("#in-page-nav-1 a").click(function(e){
		
		e.preventDefault();
		
		var dest = 0;

		if ($(this.hash).offset().top > $(document).height()-$(window).height()){

			dest = $(document).height()-$(window).height();

		} else {
		
			dest = $(this.hash).offset().top;
		
		};
		
		$('html,body').animate({scrollTop: dest}, 1000,'swing');
	
		location.hash = $(this).attr("href");
		
		updateInPageNav($(this).attr("href"));
		
	});
    
});

$(window).load(function() {

	updateInPageNav(document.location.hash);
    
});

$(window).scroll(function() {

	checkForNewSection();
    
});

function updateInPageNav(hash) {
	
	var expectedNavElement = $("#in-page-nav-1 a[href='" + hash + "']");
		
	if (expectedNavElement.length != -1) {
	
		$("#in-page-nav-1 li").removeClass("active");
		
		$(expectedNavElement).parent().addClass("active");
		
	};
	
};

function checkForNewSection() {
	
	var inview = "#" + $('.hero-photo:in-viewport:first').attr('id'),
		$link = $('#in-page-nav-1 li a').filter('[hash=' + inview + ']');
		
		console.log(inview);
	
	if (inview != "#undefined") {
		
		updateInPageNav(inview);
	
	};
	
};