scrollama
Version:
Lightweight scrollytelling library using IntersectionObserver
214 lines (180 loc) • 5.39 kB
HTML
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<title>Scrollama Demo: Enable/Disable</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;
}
#eventsToggle {
margin: 30px;
font-size: 1.5rem;
}
#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: Enable & Disable Events</h1>
<p class='intro__dek'>
Start scrolling to see how it works. Click below to enable or disable the scroller.
</p>
<button id="eventsToggle">Click to Disable Events</button>
</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='https://unpkg.com/intersection-observer@0.5.0/intersection-observer.js'></script>
<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');
var enableDisableButton = document.querySelector('#eventsToggle');
var isEnabled = true;
// 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 handleEnableStateChange() {
if (isEnabled) {
scroller.disable();
enableDisableButton.innerHTML = 'Click to Enable Events';
} else {
scroller.enable();
enableDisableButton.innerHTML = 'Click to Disable Events';
}
isEnabled = !isEnabled;
}
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,
})
.onStepEnter(handleStepEnter)
.onStepExit(handleStepExit)
.onStepProgress(handleStepProgress);
// setup resize event
window.addEventListener('resize', scroller.resize);
// handle enable/disable button clicks
enableDisableButton.addEventListener('click', handleEnableStateChange);
}
// kick things off
init();
</script>
</body>
</html>