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amp-position-observer.amp.html
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<!doctype html>
<html ⚡>
<head>
<meta charset="utf-8">
<title>amp-position-observer</title>
<link rel="canonical" href="amps.html">
<meta name="viewport" content="width=device-width,minimum-scale=1,initial-scale=1">
<script async custom-element="amp-animation" src="https://cdn.ampproject.org/v0/amp-animation-0.1.js"></script>
<script async custom-element="amp-position-observer" src="https://cdn.ampproject.org/v0/amp-position-observer-0.1.js"></script>
<style amp-custom>
main {
font-family: Helvetica, sans-serif;
padding: 10px;
max-width: 412px;
margin: auto;
}
h1, h2, h3, h4 {
font-weight: normal;
}
amp-img img {
object-fit: cover;
}
.clock-hand {
position: absolute;
width: 2vw;
height: 20vw;
max-height: 90px;
max-width: 10px;
top: 50%;
left: 50%;
z-index: 2;
background: #FAFAFA;
transform-origin: 50% 0%;
border-radius: 10px;
transform: rotate(-180deg)
}
.spacer {
height: 70vh;
width: 100%;
background-image: -webkit-linear-gradient(#EEE 50%, white 50%);
background-image: linear-gradient(#EEE 50%, white 50%);
background-size: 100% 3em;
}
pre {
display: inline;
}
</style>
<style amp-boilerplate>body{-webkit-animation:-amp-start 8s steps(1,end) 0s 1 normal both;-moz-animation:-amp-start 8s steps(1,end) 0s 1 normal both;-ms-animation:-amp-start 8s steps(1,end) 0s 1 normal both;animation:-amp-start 8s steps(1,end) 0s 1 normal both}@-webkit-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@-moz-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@-ms-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@-o-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}</style><noscript><style amp-boilerplate>body{-webkit-animation:none;-moz-animation:none;-ms-animation:none;animation:none}</style></noscript>
<script async src="https://cdn.ampproject.org/v0.js"></script>
</head>
<body>
<amp-animation id="clockAnim1" layout="nodisplay">
<script type="application/json">
{
"duration": "3s",
"fill": "both",
"direction": "alternate",
"animations": [
{
"selector": "#clock-scene-1 .clock-hand",
"keyframes": [
{ "transform": "rotate(-180deg)" },
{ "transform": "rotate(0deg)" }
]
}
]
}
</script>
</amp-animation>
<amp-animation id="clockAnim2" layout="nodisplay">
<script type="application/json">
{
"duration": "6s",
"fill": "both",
"iterations": "infinity",
"animations": [
{
"selector": "#clock-scene-2 .clock-hand",
"keyframes": [
{ "transform": "rotate(-180deg)" },
{ "transform": "rotate(180deg)" }
]
}
]
}
</script>
</amp-animation>
<main>
<div class="spacer"></div>
<h2>Scrollbound animations with amp-position-observer and amp-animation</h2>
<h3>The following animation does one round (12pm-6pm) via scrolling when fully visible between the middle 80% of the viewport</h3>
<div id="clock-scene-1" class="clock-scene">
<amp-position-observer
intersection-ratios="1"
viewport-margins="10vh"
on="scroll:clockAnim1.seekTo(percent=event.percent)"
layout="nodisplay">
</amp-position-observer>
<amp-img layout="responsive" width=2 height=1.5 src="./img/clock.jpg">
<div class="clock-hand"></div>
</amp-img>
</div>
<div class="spacer"></div>
<h2>Custom visibility start-end with amp-position-observer and amp-animation</h2>
<h3>The following animation will start when the scene is 50% visible and pauses when 50% invisible</h3>
<div id="clock-scene-2" class="clock-scene">
<amp-position-observer
intersection-ratios="0.5"
on="enter:clockAnim2.start;exit:clockAnim2.pause"
layout="nodisplay">
</amp-position-observer>
<amp-img layout="responsive" width=2 height=1.5 src="./img/clock.jpg">
<div class="clock-hand"></div>
</amp-img>
</div>
<div class="spacer"></div>
<h2>Custom visibility end with amp-position-observer and amp-video</h2>
<h3>If played, the following video will pause when 20% invisible</h3>
<div>
<amp-position-observer
intersection-ratios="0.8"
on="exit:myVideo.pause"
layout="nodisplay">
</amp-position-observer>
<amp-video
id=myVideo
title="Big Buck Bunny"
artist="Blender Foundation"
poster="img/bigbuckbunny.jpg"
album="The Peach Open Movie Project"
src="https://commondatastorage.googleapis.com/gtv-videos-bucket/sample/BigBuckBunny.mp4"
width="720"
height="405"
layout="responsive"
controls>
</amp-video>
</div>
<div class="spacer"></div>
<div class="spacer"></div>
</main>
</body>
</html>