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CSS

Posted by Gerard Gaspard
Gerard Gaspard
2,473 Points

Side bar that scrolls and then gets fixed

I have got a fixed sidebar but I would like my sidebar to scroll and then get fixed like here http://jessicahische.is/working/. Can this be done just with CSS?

2 Answers

James Barnett
James Barnett
39,199 Points
James Barnett
James Barnett
39,199 Points

No CSS has no way of knowing the current position on the page you need JavaScript for that.

This code will do it for you:

$(function () {
    var sidebar = $('.sidebar');
    var top = sidebar.offset().top - parseFloat(sidebar.css('margin-top'));

    $(window).scroll(function (event) {
      var y = $(this).scrollTop();
      if (y >= top) {
        sidebar.addClass('fixed');
      } else {
        sidebar.removeClass('fixed');
      }
    });
});

That code came from this very helpful article on how to create fixed floating elements, the article walks through what each line of the code does.

I made a quick demo on codepen using this technique that seems to approximate what the sidebar is doing on Jessica Hische's site.

Gerard Gaspard
Gerard Gaspard
2,473 Points
Gerard Gaspard
Gerard Gaspard
2,473 Points

Thanks James. This is awesome!