javascript - How to to addClass() to the active link of two different navs based on scroll position in jQuery? -

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i have 2 navs, both class of .fixed-nav , add class active link of each nav (i.e. .menu__item--current #main-nav , .is-selected #cd-vertical-nav), based on scroll position (snippet below).

this part seems wrong: 

updatemainnavigation(), updateverticalnavigation(); $(window).on('scroll', function() {     updatemainnavigation(), updateverticalnavigation(); });

my first try doesn't work:

updatemainnavigation(); $(window).on('scroll', function() {     updatemainnavigation(); });  updateverticalnavigation() $(window).on('scroll', function() {     updateverticalnavigation(); });

here snippet

you can add function listen scrolling. calculate div @ , select element , change css. can tweak number calculation if want change earlier. add class vertical-navs. in case, class="vert-nav".

function changedots(distancefromtop) {     var number = math.ceil(distancefromtop / 400);      $('.cd-dot').css({background: "#fff"});     $('.is-selected').removeclass("is-selected");     if (distancefromtop === 0) {          $($('.cd-dot')[0]).css({background: "#000"});         $($('.vert-nav')[0]).addclass("is-selected");     } else  {         $($('.cd-dot')[number - 1]).css({background: "#000"})         $($('.vert-nav')[number - 1]).addclass("is-selected");     }        } $(window).scroll(function() {     var distancefromtop = $(this).scrolltop();     changedots(distancefromtop); });

here's example: codepen


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