scopesessions.org/js/custom.js

var scrolling = false;
var navigatorOpen = false;
var topButtonVisible = true;

$(document).ready(function(){

 $(function(){
  $.scrollIt();
 });


 $(".navigator-toggle").click(function() {
  if (navigatorOpen){
   closeTopMenu();
  }else{
   openTopMenu();
  }
  navigatorOpen = !navigatorOpen;
 });

 $(".topic").click(function() {
  closeTopMenu();
 });

 function openTopMenu(){
  if (!scrolling && !navigatorOpen){
   scrolling = true;
   $(".navigator").slideDown( "slow", function() {
    scrolling = false;
    navigatorOpen = true;
   });
  }
 }

 function closeTopMenu(){
  if (!scrolling && navigatorOpen){
   scrolling = true;
   $('.navigator').slideUp( "slow", function() {
    scrolling = false;
    navigatorOpen = false;
   });
  }
 }

 function showTopButton(){
  console.log('showTopButton');
  if (!topButtonVisible){
   $('.top-button').show( "slow", function() {
    topButtonVisible = true;
   });
  }
 }

 function hideTopButton(){
  console.log('hideTopButton');
  if (topButtonVisible){
   $('.top-button').hide( "slow", function() {
    topButtonVisible = false;
   });
  }
 }

 var timeout = null;
 var navbarHeight = $('.navbar').height();

 $(window).scroll(function () {
  if (!timeout) {
      timeout = setTimeout(function () {
          clearTimeout(timeout);
          timeout = null;
          if ($(window).scrollTop() >= navbarHeight) {
           closeTopMenu();
           showTopButton();
          }else{
           hideTopButton();
          }
      }, 250);
  }
 });

});