scrollama
Version:
Lightweight scrollytelling library using IntersectionObserver
119 lines (104 loc) • 2.66 kB
HTML
<html>
<head>
<meta charset="utf-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<title>Scrollama: Basic Example</title>
<meta name="description" content="Scrollama: Basic Example" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<link rel="stylesheet" href="../docs/style.css" />
<style>
#scrolly {
position: relative;
}
article {
position: relative;
padding: 0 1rem;
margin: 0 auto;
width: 33%;
}
.step {
margin: 2rem auto 4rem auto;
background-color: #3b3b3b;
color: #fff;
}
.step.is-active {
background-color: goldenrod;
color: #3b3b3b;
}
.step p {
text-align: center;
padding: 1rem;
font-size: 1.5rem;
}
</style>
</head>
<body>
<main>
<section id="intro">
<h1 class="intro__hed">Basic Example</h1>
<p class="intro__dek">
Start scrolling to see how it works.
</p>
</section>
<section id="scrolly">
<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>
</section>
<section id="outro"></section>
</main>
<script src="../build/scrollama.js"></script>
<script>
var scrolly = document.querySelector("#scrolly");
var article = scrolly.querySelector("article");
var step = article.querySelectorAll(".step");
// initialize the scrollama
var scroller = scrollama();
// scrollama event handlers
function handleStepEnter(response) {
// response = { element, direction, index }
console.log(response);
// add to color to current step
response.element.classList.add("is-active");
}
function handleStepExit(response) {
// response = { element, direction, index }
console.log(response);
// remove color from current step
response.element.classList.remove("is-active");
}
function init() {
// set random padding for different step heights (not required)
step.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
// 2. bind scrollama event handlers (this can be chained like below)
scroller
.setup({
step: "#scrolly article .step",
debug: false,
offset: 0.5
})
.onStepEnter(handleStepEnter)
.onStepExit(handleStepExit);
}
// kick things off
init();
</script>
</body>
</html>