Change active menu on page scroll

CSS styling for active menu item

<style>

#mega-menu-primary .active a{

color:  #47c2ff ;

}

</style>

—————-

Script to enable menu change when the page scrolls

<script>

jQuery.noConflict();

(function( $ ) {

  $(function() {

  

   // Cache selectors

var lastId,

    topMenu = $("#mega-menu-primary"),

    topMenuHeight = topMenu.outerHeight()+15,

    // All list items

menuItems = topMenu.find('a[href^="#"]'),

    // Anchors corresponding to menu items

    scrollItems = menuItems.map(function(){

      var item = $($(this).attr("href"));

      if (item.length) { return item; }

   });




// Bind click handler to menu items

// so we can get a fancy scroll animation

menuItems.click(function(e){

  var href = $(this).attr("href"),

      offsetTop = href === "#" ? 0 : $(href).offset().top-topMenuHeight+1;

  $('html, body').stop().animate({ 

      scrollTop: offsetTop

  }, 300);

  e.preventDefault();

});




// Bind to scroll

$(window).scroll(function(){

   // Get container scroll position

   var fromTop = $(this).scrollTop()+topMenuHeight;

   

   // Get id of current scroll item

   var cur = scrollItems.map(function(){

     if ($(this).offset().top < fromTop)

       return this;

   });

   // Get the id of the current element

   cur = cur[cur.length-1];

   var id = cur && cur.length ? cur[0].id : "";

   

   if (lastId !== id) {

       lastId = id;

       // Set/remove active class

       menuItems

         .parent().removeClass("active")

         .end().filter("[href='#"+id+"']").parent().addClass("active");

   }                   

});

  });

})(jQuery);

</script>