cssAudio - Activefile-genericCSS - ActiveGeneric - ActiveHTML - ActiveImage - ActiveJS - ActiveSVG - ActiveText - Activefile-genericVideo - ActiveLovehtmlicon-new-collectionicon-personicon-teamlog-outoctocatpop-outspinnerstartv

Pen Settings

CSS Base

Vendor Prefixing

Add External Stylesheets/Pens

Any URL's added here will be added as <link>s in order, and before the CSS in the editor. If you link to another Pen, it will include the CSS from that Pen. If the preprocessor matches, it will attempt to combine them before processing.

Quick-add: + add another resource

Add External Scripts/Pens

Any URL's added here will be added as <script>s in order, and run before the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.

Quick-add: + add another resource

Code Indentation

     

Save Automatically?

If active, Pens will autosave every 30 seconds after being saved once.

Auto-Updating Preview

If enabled, the preview panel updates automatically as you code. If disabled, use the "Run" button to update.

            
              <main class="Loop js-loop">
  <section class="green">
    <h1>One</h1>
  </section>
  <section class="red">
    <h1>For</h1>
  </section>
  <section class="blue">
    <h1>All</h1>
  </section>
  <section class="orange">
    <h1>And</h1>
  </section>
  <section class="blue">
    <h1>All</h1>
  </section>
  <section class="red">
    <h1>For</h1>
  </section>

  <!--
  These blocks are the same as the first blocks to get that looping illusion going.
  You need to add clones to fill out a full viewport height.
  -->
  <section class="green is-clone">
    <h1>One</h1>
  </section>
  <section class="red is-clone">
    <h1>For</h1>
  </section>
</main>
            
          
!
            
              html,
body {
  height: 100%;
  overflow: hidden;
}

.Loop {
  position: relative;
  height: 100%;
  overflow: auto;
  -webkit-overflow-scrolling: touch;
}

section {
  position: relative;
  text-align: center;
  min-height: 300px;
  max-height: 700px;
  height: 80%;
}

::scrollbar {
  display: none;
}







body {
  font-family: "Avenir Next", Helvetica, sans-serif;
  font-weight: normal;
  font-size: 100%;
}

.red {
  background: #FF4136;
}
.green {
  background: #2ECC40;
}
.blue {
  background: #0074D9;
}
.orange {
  background: rebeccapurple;
}

h1 {
  margin: 0;
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 100%;
  font-size: 80px;
  letter-spacing: 5px;
  color: #fff;
  text-transform: uppercase;
}
            
          
!
            
              var doc = window.document,
  context = doc.querySelector('.js-loop'),
  clones = context.querySelectorAll('.is-clone'),
  disableScroll = false,
  scrollHeight = 0,
  scrollPos = 0,
  clonesHeight = 0,
  i = 0;

function getScrollPos () {
  return (context.pageYOffset || context.scrollTop) - (context.clientTop || 0);
}

function setScrollPos (pos) {
  context.scrollTop = pos;
}

function getClonesHeight () {
  clonesHeight = 0;

  for (i = 0; i < clones.length; i += 1) {
    clonesHeight = clonesHeight + clones[i].offsetHeight;
  }

  return clonesHeight;
}

function reCalc () {
  scrollPos = getScrollPos();
  scrollHeight = context.scrollHeight;
  clonesHeight = getClonesHeight();

  if (scrollPos <= 0) {
    setScrollPos(1); // Scroll 1 pixel to allow upwards scrolling
  }
}

function scrollUpdate () {
  if (!disableScroll) {
    scrollPos = getScrollPos();

    if (clonesHeight + scrollPos >= scrollHeight) {
      // Scroll to the top when you’ve reached the bottom
      setScrollPos(1); // Scroll down 1 pixel to allow upwards scrolling
      disableScroll = true;
    } else if (scrollPos <= 0) {
      // Scroll to the bottom when you reach the top
      setScrollPos(scrollHeight - clonesHeight);
      disableScroll = true;
    }
  }

  if (disableScroll) {
    // Disable scroll-jumping for a short time to avoid flickering
    window.setTimeout(function () {
      disableScroll = false;
    }, 40);
  }
}

window.requestAnimationFrame(reCalc);

context.addEventListener('scroll', function () {
  window.requestAnimationFrame(scrollUpdate);
}, false);

window.addEventListener('resize', function () {
  window.requestAnimationFrame(reCalc);
}, false);








// Just for this demo: Center the middle block on page load
window.onload = function () {
  setScrollPos(Math.round(clones[0].getBoundingClientRect().top + getScrollPos() - (context.offsetHeight - clones[0].offsetHeight) / 2));
};
            
          
!
999px
Loading ..................

Console