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Display Nav on scroll up

I’m wondering if someone could help me or offer advice on how I would create an interaction so that the Navigation bar is displayed when a user starts to scroll back up the page.

Essentially i’m trying to imitate this effect -

many thanks

example: :wink:



    $('body').bind('mousewheel', function(e){

        if(e.originalEvent.wheelDelta < 0) {
        } else {

    function userScrollDown() {
        $('.navbar').css('top', '-103px')
    function userScrollUp() {
        $('.navbar').css('top', '0')