scrollama
Version:
Lightweight scrollytelling library using IntersectionObserver
132 lines (117 loc) • 4.37 kB
HTML
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<title>Scrollama: Progress Example</title>
<meta name="description" content="Scrollama: Progress Example">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel='stylesheet' href='../style.css'>
<style>
#scrolly {
position: relative;
}
article {
position: relative;
padding: 0 1rem;
margin: 0 auto;
width: 33%;
}
.step {
margin: 2rem auto 4rem auto;
padding: 1rem;
border: 2px solid #f3f3f3;
}
.step p {
text-align: center;
margin: 0.5rem auto;
font-size: 1.5rem;
}
</style>
</head>
<body>
<a href="https://github.com/russellgoldenberg/scrollama" target="_blank" class="github-corner"
aria-label="View source on GitHub"><svg width="80" height="80" viewBox="0 0 250 250"
style="fill:#151513; color:#fff; position: absolute; top: 0; border: 0; right: 0;" aria-hidden="true">
<path d="M0,0 L115,115 L130,115 L142,142 L250,250 L250,0 Z"></path>
<path
d="M128.3,109.0 C113.8,99.7 119.0,89.6 119.0,89.6 C122.0,82.7 120.5,78.6 120.5,78.6 C119.2,72.0 123.4,76.3 123.4,76.3 C127.3,80.9 125.5,87.3 125.5,87.3 C122.9,97.6 130.6,101.9 134.4,103.2"
fill="currentColor" style="transform-origin: 130px 106px;" class="octo-arm"></path>
<path
d="M115.0,115.0 C114.9,115.1 118.7,116.5 119.8,115.4 L133.7,101.6 C136.9,99.2 139.9,98.4 142.2,98.6 C133.8,88.0 127.5,74.4 143.8,58.0 C148.5,53.4 154.0,51.2 159.7,51.0 C160.3,49.4 163.2,43.6 171.4,40.1 C171.4,40.1 176.1,42.5 178.8,56.2 C183.1,58.6 187.2,61.8 190.9,65.4 C194.5,69.0 197.7,73.2 200.1,77.6 C213.8,80.2 216.3,84.9 216.3,84.9 C212.7,93.1 206.9,96.0 205.4,96.6 C205.1,102.4 203.0,107.8 198.3,112.5 C181.9,128.9 168.3,122.5 157.7,114.1 C157.9,116.9 156.7,120.9 152.7,124.9 L141.0,136.5 C139.8,137.7 141.6,141.9 141.8,141.8 Z"
fill="currentColor" class="octo-body"></path>
</svg></a>
<main>
<nav>
<a href='https://github.com/russellgoldenberg/scrollama'>scrollama.js</a>
<div class='nav__examples'>
<p>Examples:</p>
<a href='https://russellgoldenberg.github.io/scrollama/basic'>Basic</a>
<a href='https://russellgoldenberg.github.io/scrollama/progress'>Progress</a>
<a href='https://russellgoldenberg.github.io/scrollama/sticky-side'>Sticky Side</a>
<a href='https://russellgoldenberg.github.io/scrollama/sticky-overlay'>Sticky Overlay</a>
</div>
</nav>
<section id='intro'>
<h1 class='intro__hed'>Progress Example</h1>
<p class='intro__dek'>
Start scrolling to see how it works.
</p>
</section>
<section id='scrolly'>
<article>
<div class='step' data-step='218,165,32'>
<p>STEP 1</p>
<p class='progress'>0%</p>
</div>
<div class='step' data-step='0,128,128'>
<p>STEP 2</p>
<p class='progress'>0%</p>
</div>
</article>
</section>
<section id='outro'></section>
</main>
<script src='https://unpkg.com/d3@5.9.1/dist/d3.min.js'></script>
<script src='https://unpkg.com/intersection-observer@0.5.1/intersection-observer.js'></script>
<script src='../scrollama.min.js'></script>
<script>
// using d3 for convenience
var scrolly = d3.select('#scrolly');
var article = scrolly.select('article');
var step = article.selectAll('.step');
// initialize the scrollama
var scroller = scrollama();
function handleStepProgress(response) {
console.log(response)
var el = d3.select(response.element);
var val = el.attr('data-step');
var rgba = 'rgba(' + val + ', ' + response.progress + ')';
el.style('background-color', rgba);
el.select('.progress').text(d3.format('.1%')(response.progress))
}
function resize() {
var min = window.innerHeight * 0.5
var h = min + Math.random() * window.innerHeight * 0.25
step.style('height', Math.floor(h) + 'px')
scroller.resize()
}
function init() {
// 1. setup the scroller with the bare-bones settings
// this will also initialize trigger observations
// 3. bind scrollama event handlers (this can be chained like below)
scroller.setup({
step: '#scrolly article .step',
progress: true,
debug: true,
})
.onStepProgress(handleStepProgress);
// setup resize event
resize()
window.addEventListener('resize', resize);
}
// kick things off
init();
</script>
</body>
</html>