scrollama
Version:
Lightweight scrollytelling library using IntersectionObserver
244 lines (210 loc) • 5.87 kB
HTML
<html>
<head>
<meta charset="utf-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<title>Scrollama Demo: Fixed JS</title>
<meta name="description" content="Scrollama Demo: Fixed JS" />
<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: 1200px;
}
/* scrollama */
#scroll {
position: relative;
border-top: 2px dashed #000;
border-bottom: 2px dashed #000;
display: -webkit-box;
display: -ms-flexbox;
display: flex;
}
figure {
position: sticky;
width: 100%;
top: 0;
right: 2rem;
-webkit-transform: translate3d(0, 0, 0);
-moz-transform: translate3d(0, 0, 0);
transform: translate3d(0, 0, 0);
background-color: #ddd;
border: 1px solid #000;
}
article 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;
}
article {
position: relative;
padding: 0 1rem;
width: 30rem;
}
.step {
margin: 0 auto 2rem auto;
border: 1px solid #333;
position: relative;
/* border-bottom: none; */
}
.step:last-child {
border-bottom: 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 Position</h1>
<p class="intro__dek">
Start scrolling to see how it works.
</p>
</section>
<section id="scroll">
<article>
<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>
</article>
<figure>
<p>0</p>
</figure>
</section>
<section id="outro"></section>
<script src="d3.v4.min.js"></script>
<script src="https://unpkg.com/intersection-observer"></script>
<script src="../build/scrollama.js"></script>
<script>
// using d3 for convenience
var container = d3.select("#scroll");
var figure = container.select("figure");
var article = container.select("article");
var step = article.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;
var figureHeight = Math.floor(window.innerHeight * 0.5);
figure.style("height", figureHeight + "px");
// 3. tell scrollama to update new element dimensions
scroller.resize();
}
// scrollama event handlers
function handleStepEnter(response) {
console.log(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
figure.select("p").text(response.index + 1);
}
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({
step: "article .step",
debug: true,
offset: 0.75
})
.onStepEnter(handleStepEnter);
// setup resize event
window.addEventListener("resize", handleResize);
}
// kick things off
init();
</script>
</body>
</html>