Scroll Indicator

link source

    $(document).ready(function() {
        // When the user scrolls the page, execute myFunction 
        window.onscroll = function() { myFunction() };

        function myFunction() {
            var winScroll = document.body.scrollTop || document.documentElement.scrollTop;
            var height = document.documentElement.scrollHeight - document.documentElement.clientHeight;
            var scrolled = (winScroll / height) * 100;
            document.getElementById("progressBar").style.width = scrolled + "%";
        }
    });