scrollama
Version:
Lightweight scrollytelling library using IntersectionObserver
194 lines (165 loc) • 3.87 kB
HTML
<html>
<head>
<meta charset="utf-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<title>Scrollama Demo: Basic</title>
<meta name="description" content="Scrollama Demo: Basic" />
<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;
}
.scroll__text {
position: relative;
padding: 0 1rem;
margin: 0 auto;
width: 33%;
}
.step {
margin: 2rem auto 4rem 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: Basic</h1>
<p class="intro__dek">
Start scrolling to see how it works.
</p>
</section>
<section id="scroll">
<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>
</section>
<section id="outro"></section>
<script src="../build/scrollama.js"></script>
<script src="d3.v4.min.js"></script>
<script>
var container = document.querySelector("#scroll");
var text = container.querySelector(".scroll__text");
var steps = text.querySelectorAll(".step");
// initialize the scrollama
var scroller = scrollama();
// scrollama event handlers
function handleStepEnter(response) {
// response = { element, direction, index }
console.log("enter", response);
// add to color to current step
response.element.classList.add("is-active");
}
function handleStepExit(response) {
// response = { element, direction, index }
console.log("exit", response);
// remove color from current step
response.element.classList.remove("is-active");
}
function handleStepProgress(response) {
console.log(response.progress);
d3.select(response.element)
.select("p")
.text(d3.format(".1%")(response.progress));
}
function init() {
// set random padding for different step heights (not required)
steps.forEach(function (step) {
var v = 100 + Math.floor((Math.random() * window.innerHeight) / 4);
step.style.padding = v + "px 0px";
});
// 1. setup the scroller with the bare-bones options
// this will also initialize trigger observations
// 3. bind scrollama event handlers (this can be chained like below)
scroller
.setup({
step: ".scroll__text .step",
debug: true,
progress: true,
offset: 0
})
.onStepEnter(handleStepEnter)
.onStepExit(handleStepExit)
.onStepProgress(handleStepProgress);
// setup resize event
window.addEventListener("resize", scroller.resize);
}
// kick things off
init();
</script>
</body>
</html>