TrackAsia GL JS Docs
TrackAsiaTrackAsia GL JS DocsExamplesFly to a location based on scroll position

Fly to a location based on scroll position

Scroll down through the story and the map will fly to the chapter's location.

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>Fly to a location based on scroll position</title>
<meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no" />
<script src="https://unpkg.com/trackasia-gl@1.0.5/dist/trackasia-gl.js"></script>
<link href="https://unpkg.com/trackasia-gl@1.0.5/dist/trackasia-gl.css" rel="stylesheet" />
<style>
	body { margin: 0; padding: 0; }
	#map { position: absolute; top: 0; bottom: 0; width: 100%; }
</style>
</head>
<body>
<style>
#map {
position: fixed;
width: 50%;
}
#features {
width: 50%;
margin-left: 50%;
font-family: sans-serif;
overflow-y: scroll;
background-color: #fafafa;
}
section {
padding: 25px 50px;
line-height: 25px;
border-bottom: 1px solid #ddd;
opacity: 0.25;
font-size: 13px;
}
section.active {
opacity: 1;
}
section:last-child {
border-bottom: none;
margin-bottom: 200px;
}
</style>
 
<div id="map"></div>
<div id="features">
<section id="baker" class="active">
<h3>Heading 1</h3>
<p>
Demo content: Lorem ipsum dolor sit amet, consectetur adipiscing
elit. Sed porttitor risus leo, eget sodales felis maximus et. Donec
pulvinar, velit eu ultrices elementum, metus lacus posuere felis, in
elementum augue diam at risus. Phasellus tincidunt felis ut arcu
congue laoreet. Nam non tristique odio. Vestibulum ante ipsum primis
in faucibus orci luctus et ultrices posuere cubilia curae; Maecenas
molestie vitae enim in vehicula. Maecenas placerat nec erat
hendrerit commodo. Aenean gravida, libero et pulvinar euismod,..
</p>
</section>
<section id="aldgate">
<h3>Heading 2</h3>
<p>
Demo content: Lorem ipsum dolor sit amet, consectetur adipiscing
elit. Sed porttitor risus leo, eget sodales felis maximus et. Donec
pulvinar, velit eu ultrices elementum, metus lacus posuere felis, in
elementum augue diam at risus. Phasellus tincidunt felis ut arcu
congue laoreet. Nam non tristique odio. Vestibulum ante ipsum primis
in faucibus orci luctus et ultrices posuere cubilia curae; Maecenas
molestie vitae enim in vehicula. Maecenas placerat nec erat
hendrerit commodo. Aenean gravida, libero et pulvinar euismod,..
</p>
</section>
<section id="london-bridge">
<h3>Heading 3</h3>
<p>
Demo content: Lorem ipsum dolor sit amet, consectetur adipiscing
elit. Sed porttitor risus leo, eget sodales felis maximus et. Donec
pulvinar, velit eu ultrices elementum, metus lacus posuere felis, in
elementum augue diam at risus. Phasellus tincidunt felis ut arcu
congue laoreet. Nam non tristique odio. Vestibulum ante ipsum primis
in faucibus orci luctus et ultrices posuere cubilia curae; Maecenas
molestie vitae enim in vehicula. Maecenas placerat nec erat
hendrerit commodo. Aenean gravida, libero et pulvinar euismod,..
</p>
</section>
<section id="woolwich">
<h3>Heading 4</h3>
<p>
Demo content: Lorem ipsum dolor sit amet, consectetur adipiscing
elit. Sed porttitor risus leo, eget sodales felis maximus et. Donec
pulvinar, velit eu ultrices elementum, metus lacus posuere felis, in
elementum augue diam at risus. Phasellus tincidunt felis ut arcu
congue laoreet. Nam non tristique odio. Vestibulum ante ipsum primis
in faucibus orci luctus et ultrices posuere cubilia curae; Maecenas
molestie vitae enim in vehicula. Maecenas placerat nec erat
hendrerit commodo. Aenean gravida, libero et pulvinar euismod,..
</p>
</section>
<section id="gloucester">
<h3>Heading 5</h3>
<p>
Demo content: Lorem ipsum dolor sit amet, consectetur adipiscing
elit. Sed porttitor risus leo, eget sodales felis maximus et. Donec
pulvinar, velit eu ultrices elementum, metus lacus posuere felis, in
elementum augue diam at risus. Phasellus tincidunt felis ut arcu
congue laoreet. Nam non tristique odio. Vestibulum ante ipsum primis
in faucibus orci luctus et ultrices posuere cubilia curae; Maecenas
molestie vitae enim in vehicula. Maecenas placerat nec erat
hendrerit commodo. Aenean gravida, libero et pulvinar euismod,..
</p>
</section>
<section id="caulfield-gardens">
<h3>Heading 6</h3>
<p>
Demo content: Lorem ipsum dolor sit amet, consectetur adipiscing
elit. Sed porttitor risus leo, eget sodales felis maximus et. Donec
pulvinar, velit eu ultrices elementum, metus lacus posuere felis, in
elementum augue diam at risus. Phasellus tincidunt felis ut arcu
congue laoreet. Nam non tristique odio. Vestibulum ante ipsum primis
in faucibus orci luctus et ultrices posuere cubilia curae; Maecenas
molestie vitae enim in vehicula. Maecenas placerat nec erat
hendrerit commodo. Aenean gravida, libero et pulvinar euismod,..
</p>
</section>
<section id="telegraph">
<h3>Heading 7</h3>
<p>
Demo content: Lorem ipsum dolor sit amet, consectetur adipiscing
elit. Sed porttitor risus leo, eget sodales felis maximus et. Donec
pulvinar, velit eu ultrices elementum, metus lacus posuere felis, in
elementum augue diam at risus. Phasellus tincidunt felis ut arcu
congue laoreet. Nam non tristique odio. Vestibulum ante ipsum primis
in faucibus orci luctus et ultrices posuere cubilia curae; Maecenas
molestie vitae enim in vehicula. Maecenas placerat nec erat
hendrerit commodo. Aenean gravida, libero et pulvinar euismod,..
</p>
</section>
<section id="charing-cross">
<h3>Heading 8</h3>
<p>
Demo content: Lorem ipsum dolor sit amet, consectetur adipiscing
elit. Sed porttitor risus leo, eget sodales felis maximus et. Donec
pulvinar, velit eu ultrices elementum, metus lacus posuere felis, in
elementum augue diam at risus. Phasellus tincidunt felis ut arcu
congue laoreet. Nam non tristique odio. Vestibulum ante ipsum primis
in faucibus orci luctus et ultrices posuere cubilia curae; Maecenas
molestie vitae enim in vehicula. Maecenas placerat nec erat
hendrerit commodo. Aenean gravida, libero et pulvinar euismod,..
</p>
</section>
</div>
<script>
var map = new trackasiagl.Map({
container: 'map',
style: 'https://maps.track-asia.com/styles/v1/streets.json?key=public_key',
center: {"lat":10.762622,"lng":106.660172},
zoom: 15.5,
bearing: 27,
pitch: 45
});
 
var chapters = {
'baker': {
bearing: 27,
center: [106.660172,10.762622],
zoom: 15.5,
pitch: 20
},
'aldgate': {
duration: 6000,
center: [106.756548,10.681964],
bearing: 150,
zoom: 15,
pitch: 0
},
'london-bridge': {
bearing: 90,
center: [106.74565,10.745506],
zoom: 13,
speed: 0.6,
pitch: 40
},
'woolwich': {
bearing: 90,
center: [106.819906,10.78383],
zoom: 12.3
},
'gloucester': {
bearing: 45,
center: [106.397652,11.386609],
zoom: 15.3,
pitch: 20,
speed: 0.5
},
'caulfield-gardens': {
bearing: 180,
center: [105.583993,10.788252],
zoom: 12.3
},
'telegraph': {
bearing: 90,
center: [106.669818,10.770708],
zoom: 17.3,
pitch: 40
},
'charing-cross': {
bearing: 90,
center: [106.669228,10.771124],
zoom: 14.3,
pitch: 20
}
};
 
// On every scroll event, check which element is on screen
window.onscroll = function () {
var chapterNames = Object.keys(chapters);
for (var i = 0; i < chapterNames.length; i++) {
var chapterName = chapterNames[i];
if (isElementOnScreen(chapterName)) {
setActiveChapter(chapterName);
break;
}
}
};
 
var activeChapterName = 'baker';
function setActiveChapter(chapterName) {
if (chapterName === activeChapterName) return;
 
map.flyTo(chapters[chapterName]);
 
document.getElementById(chapterName).setAttribute('class', 'active');
document.getElementById(activeChapterName).setAttribute('class', '');
 
activeChapterName = chapterName;
}
 
function isElementOnScreen(id) {
var element = document.getElementById(id);
var bounds = element.getBoundingClientRect();
return bounds.top < window.innerHeight && bounds.bottom > 0;
}
</script>
 
</body>
</html>