progress.c-progress.js-progress(value="0" max="1")
article
h1 Mobile-friendly reading progress with minimal JS
each section in [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14 ]
p Lorem ipsum dolor sit amet, consectetur adipiscing elit. Proin porta risus urna, non molestie risus dignissim ut. Maecenas varius leo quis lectus rhoncus mollis. Donec condimentum, ipsum ac consectetur rhoncus, tellus dolor volutpat libero, vitae volutpat mi eros a metus. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Proin at dolor non enim pretium tempor id gravida dui. Pellentesque porta metus in felis molestie gravida. Sed in diam mi. Suspendisse vel odio dapibus, aliquam nisi ut, condimentum ante.
p In tincidunt dui ac ante efficitur posuere. Integer diam nisl, scelerisque sit amet est non, venenatis suscipit tortor. Integer ultricies bibendum ante et tempus. Donec nibh sem, tempor ac consequat at, rhoncus at elit. Fusce aliquam tempus ex, vitae venenatis ipsum mattis aliquet. Aliquam convallis lacinia lectus, sit amet consectetur augue aliquam eu. Morbi enim mi, scelerisque non viverra in, mattis vitae ligula. Donec nulla lacus, interdum ac tortor vitae, consectetur sodales lorem. Morbi iaculis ante sit amet lacus maximus, non elementum libero scelerisque. Vivamus id magna convallis, ullamcorper nisl eu, efficitur ipsum. Praesent eros ante, maximus et quam vitae, laoreet blandit neque.
View Compiled
$progress-color: lighten(#1e1935, 20)
.c-progress
position: fixed
top: 0
left: 0
width: 100%
height: 5px
appearance: none
background: transparent
border: none
color: $progress-color
z-index: 5
&::-webkit-progress-bar
background: transparent
&::-webkit-progress-value
background: $progress-color
&::-moz-progress-bar
background: $progress-color
article
margin: 0 auto
width: 65%
max-width: 700px
p
font: 16px/#{1.5} "Poppins", Arial, sans-serif
margin-bottom: 2em
h1
font: bold 46px/#{1.25} "Poppins", Arial, sans-serif
margin: 1.5em 0
*
-webkit-font-smoothing: antialisased
box-sizing: border-box
View Compiled
//- Reading Progress Indicator
{
const progress = document.querySelector('.js-progress');
const body = document.body;
const html = document.documentElement;
const updateSizes = () => ({
height: Math.max(body.scrollHeight, body.offsetHeight, html.clientHeight, html.scrollHeight, html.offsetHeight),
vh: Math.max(html.clientHeight, window.innerHeight || 0)
});
let scrollY = 0;
let sizes = updateSizes();
const update = () => progress.setAttribute('value', 100 - (sizes.height - scrollY - sizes.vh) / sizes.height * 100);
const onScroll = () => {
scrollY = (window.pageYOffset || document.scrollTop) - (document.clientTop || 0);
requestAnimationFrame(update);
}
const onResize = () => {
sizes = updateSizes();
requestAnimationFrame(update);
}
if(progress) {
progress.setAttribute('max', 100);
window.addEventListener('scroll', onScroll, false);
window.addEventListener('resize', onResize, false);
}
}
This Pen doesn't use any external JavaScript resources.