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Created March 25, 2018 22:01
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ScrollyTelling Practice
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index.html
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<title>Scrollama Demo: Fixed CSS</title>
<meta name="description" content="Scrollama Demo: Fixed CSS">
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
/* default / demo page */
* {
box-sizing: border-box;
}
html,
body {
margin: 0;
padding: 0;
font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
}
body {
min-height: 1280px;
font-weight: 300;
color: #2a2a2a;
}
p,
h1,
h2,
h3,
h4,
a {
margin: 0;
font-weight: 300;
}
a,
a:visited,
a:hover {
color: #f30;
text-decoration: none;
border-bottom: 1px solid currentColor;
}
#intro {
max-width: 40rem;
margin: 1rem auto;
text-align: center;
}
.intro__overline {
font-size: 1.4rem;
}
.intro__hed {
font-size: 1.4rem;
margin: 1.5rem auto;
text-transform: uppercase;
font-weight: 900;
letter-spacing: 0.05em;
}
.intro__dek {
font-size: 1.4rem;
}
/* demo */
#intro {
margin-bottom: 320px;
}
#outro {
height: 640px;
}
/* scrollama */
#scroll {
position: relative;
border-top: 1px dashed #000;
border-bottom: 1px dashed #000;
}
.scroll__graphic {
position: absolute;
top: 0;
left: 0;
bottom: auto;
background-color: #fff;
-webkit-transform: translate3d(0, 0, 0);
-moz-transform: translate3d(0, 0, 0);
transform: translate3d(0, 0, 0);
}
.scroll__graphic.is-fixed {
position: fixed;
}
.scroll__graphic.is-bottom {
bottom: 0;
top: auto;
}
.chart {
position: absolute;
right: 1rem;
top: 50%;
-moz-transform: translateY(-50%);
-webkit-transform: translateY(-50%);
transform: translateY(-50%);
background-color: #ddd;
border: 1px solid #000;
}
.chart p {
text-align: center;
padding: 1rem;
position: absolute;
top: 50%;
left: 50%;
-moz-transform: translate(-50%, -50%);
-webkit-transform: translate(-50%, -50%);
transform: translate(-50%, -50%);
font-size: 8rem;
font-weight: 900;
color: #666;
}
.scroll__text {
position: relative;
padding: 0 1rem;
max-width: 30rem;
width: 33%;
}
.step {
margin: 2rem auto;
border: 1px solid #333;
}
.step.is-active {
background-color: lightgoldenrodyellow;
}
.step p {
text-align: center;
padding: 1rem;
font-size: 1.5rem;
}
</style>
</head>
<body>
<section id='intro'>
<p class='intro__overline'>
<a href='https://github.com/russellgoldenberg/scrollama'>scrollama.js</a>
</p>
<h1 class='intro__hed'>Demo: Sticky Graphic</h1>
<p class='intro__dek'>
Start scrolling to see how it works.
</p>
</section>
<section id='scroll'>
<div class='scroll__graphic'>
<div class='chart'>
<p>0</p>
</div>
</div>
<div class='scroll__text'>
<div class='step' data-step='1'>
<p>STEP 1</p>
</div>
<div class='step' data-step='2'>
<p>STEP 2</p>
</div>
<div class='step' data-step='3'>
<p>STEP 3</p>
</div>
<div class='step' data-step='4'>
<p>STEP 4</p>
</div>
</div>
</section>
<section id='outro'></section>
<div class='debug'></div>
<script src='https://d3js.org/d3.v4.min.js'></script>
<script src='https://unpkg.com/intersection-observer'></script>
<script src='https://cdnjs.cloudflare.com/ajax/libs/scrollama/1.4.1/scrollama.min.js'></script>
<script>
// using d3 for convenience
var container = d3.select('#scroll');
var graphic = container.select('.scroll__graphic');
var chart = graphic.select('.chart');
var text = container.select('.scroll__text');
var step = text.selectAll('.step');
// initialize the scrollama
var scroller = scrollama();
// generic window resize listener event
function handleResize() {
// 1. update height of step elements
var stepHeight = Math.floor(window.innerHeight * 0.75);
step.style('height', stepHeight + 'px');
// 2. update width/height of graphic element
var bodyWidth = d3.select('body').node().offsetWidth;
graphic
.style('width', bodyWidth + 'px')
.style('height', window.innerHeight + 'px');
var chartMargin = 32;
var textWidth = text.node().offsetWidth;
var chartWidth = graphic.node().offsetWidth - textWidth - chartMargin;
chart
.style('width', chartWidth + 'px')
.style('height', Math.floor(window.innerHeight / 2) + 'px');
// 3. tell scrollama to update new element dimensions
scroller.resize();
}
// scrollama event handlers
function handleStepEnter(response) {
// response = { element, direction, index }
// add color to current step only
step.classed('is-active', function (d, i) {
return i === response.index;
})
// update graphic based on step
chart.select('p').text(response.index + 1)
}
function handleContainerEnter(response) {
// response = { direction }
// sticky the graphic (old school)
graphic.classed('is-fixed', true);
graphic.classed('is-bottom', false);
}
function handleContainerExit(response) {
// response = { direction }
// un-sticky the graphic, and pin to top/bottom of container
graphic.classed('is-fixed', false);
graphic.classed('is-bottom', response.direction === 'down');
}
function init() {
// 1. force a resize on load to ensure proper dimensions are sent to scrollama
handleResize();
// 2. setup the scroller passing options
// this will also initialize trigger observations
// 3. bind scrollama event handlers (this can be chained like below)
scroller.setup({
container: '#scroll',
graphic: '.scroll__graphic',
text: '.scroll__text',
step: '.scroll__text .step',
debug: true,
})
.onStepEnter(handleStepEnter)
.onContainerEnter(handleContainerEnter)
.onContainerExit(handleContainerExit);
// setup resize event
window.addEventListener('resize', handleResize);
}
// kick things off
init();
</script>
</body>
</html>
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