Sticky & Anchored

[email protected]

by Ryan Brackett

HTML

<header><b>I am the header</b>
  <p>Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod.</p>
</header>
<div class="container">
  <div class="sticky-container">
    <div class="sticky">
      <div class="inner">

        <b>I am the sticky</b>
        <br/>
        <br/>Code author: <a href="mailto:[email protected]">[email protected]</a>
        <br/>
        <br/> Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore. sea takimata
      </div>
    </div>
  </div>
  <section class="content">
    <div class="inner">


      <p><b>I am the content.</b></p>
      <p>Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea
        takimata sanctus est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores
        et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua.
        At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet.</p>

      <p>Duis autem vel eum iriure dolor in hendrerit in vulputate velit esse molestie consequat, vel illum dolore eu feugiat nulla facilisis at vero eros et accumsan et iusto odio dignissim qui blandit praesent luptatum zzril delenit augue duis dolore te
        feugait nulla facilisi. Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna...

CSS

html,
body {
  padding: 0;
  margin: 0px;
  font-family: Arial;
  font-size: 1.2em;
  line-height: 1.5em;
  height: 100%;
}

header {
  text-align: center;
  padding: 5% 20%;
  background-color: #ededed;
}

.container {
  position: relative;
}

.container section {
  width: 50%;
  float: left;
}

.sticky-container {
  width: 50%;
  float: right;
}

.sticky {
  text-align: center;
  background-color: #f5462f;
  color: white;
}

.sticky a {
  color: white;
}

.inner {
  padding: 40px;
}

.sticky.fixed {
  position: fixed;
}

.sticky.anchored {
  position: absolute;
}

.sticky.top {
  top: 0px;
}

.sticky.bottom {
  bottom: 0px;
}

footer {
  text-align: center;
  padding: 5% 20%;
  background-color: #ededed;
}

.clearall {
  clear: both;
}

JavaScript

$(window).bind('scroll', function() {
  var
    hH = $('header').outerHeight(),
    sH = $('.sticky').outerHeight(),
    cH = $('.content').outerHeight(),
    wS = $(window).scrollTop();

  if (wS > hH) { // When you scroll past the header
    $(".sticky").addClass("fixed top").removeClass("bottom anchored");
    console.log("Sticky is fixed");

    if (wS > hH + cH - sH) { // Anchor sticky when bottom is reached
      $(".sticky").removeClass("top fixed").addClass("anchored bottom");
      console.log("Sticky is anchored");
    }

  } else { // Normal state before scrolling
    $(".sticky").removeClass("top bottom anchored fixed");
  }

});