Sticky Bootstrap navbar on scroll for Bootstrap 4

index.html

<nav class="navbar" data-toggle="sticky-onscroll">
   <div class="container">
       <div class="navbar-header">
            <a class="navbar-brand" href="http://bootbites.com">BootBites.com</a>
        </div>
   </div>
</nav>

scripts.js

$(document).ready(function() {
  // Custom 
  var stickyToggle = function(sticky, stickyWrapper, scrollElement) {
    var stickyHeight = sticky.outerHeight();
    var stickyTop = stickyWrapper.offset().top;
    if (scrollElement.scrollTop() >= stickyTop){
      stickyWrapper.height(stickyHeight);
      sticky.addClass("is-sticky");
    }
    else{
      sticky.removeClass("is-sticky");
      stickyWrapper.height('auto');
    }
  };
  
  // Find all data-toggle="sticky-onscroll" elements
  $('[data-toggle="sticky-onscroll"]').each(function() {
    var sticky = $(this);
    var stickyWrapper = $('<div>').addClass('sticky-wrapper'); // insert hidden element to maintain actual top offset on page
    sticky.before(stickyWrapper);
    sticky.addClass('sticky');
    
    // Scroll & resize events
    $(window).on('scroll.sticky-onscroll resize.sticky-onscroll', function() {
      stickyToggle(sticky, stickyWrapper, $(this));
    });
    
    // On page load
    stickyToggle(sticky, stickyWrapper, $(window));
  });
});

style.css

.sticky.is-sticky {
  position: fixed;
  left: 0;
  right: 0;
  top: 0;
  z-index: 1000;
  width: 100%;
}

Good work!

Line 6 should be simply > in the comparison otherwise the action sticky.removeClass("is-sticky"); is never called on desktop when you scroll back to the top at 0 units offset (do any browsers hit a negative scroll?)

I needed the class removed because I was using CSS styling to scale the Brand element smaller on scroll via a transition effect. and wanted ti restored when back to the top of the page.