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v_3_scroll_to_trigger_video.html
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<!doctype html>
<html lang="en">
<head>
<!-- Required meta tags -->
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<title>Scrolled Video 03: scroll to trigger video</title>
<!-- Bootstrap CSS -->
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css"
integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">
<style>
#video1,
#video2 {
width: 100vw;
/* height:50vh; */
z-index: -1;
}
/* #v1frame, #v2frame{
height:100vh;
overflow:hidden;
} */
</style>
<title>Hello, world!</title>
</head>
<body>
<div style="height: 100vh; background-color:dodgerblue;"></div>
<div id="v1frame" style="height:500vh">
<div class="sticky-top">
<video id="video1" src="mov/forward.mp4" class="video"></video>
</div>
</div>
<div style="height:100vh;background:grey;"></div>
<div id="v2frame" style="height:500vh">
<div class="sticky-top">
<video id="video2" src="mov/backward.mp4"></video>
</div>
</div>
<div style="height:100vh;background:grey;"></div>
<!-- Optional JavaScript -->
<!-- jQuery first, then Popper.js, then Bootstrap JS -->
<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js"
integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous">
</script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js"
integrity="sha384-UO2eT0CpHqdSJQ6hJty5KVphtPhzWj9WO1clHTMGa3JDZwrnQq4sF86dIHNDz0W1" crossorigin="anonymous">
</script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js"
integrity="sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM" crossorigin="anonymous">
</script>
<script>
$(document).ready(function () {
var video1_pos = $("#video1").offset().top;
console.log(video1_pos);
var video2_pos = $("#video2").offset().top;
var video1_end = $("#video1").offset().top + $("#v1frame").height();
var video2_end = $("#video2").offset().top + $("#v2frame").height();
$(window).scroll(function () {
var scrolled = $(window).scrollTop();
var winh = $(window).height();
if (scrolled > video1_pos && scrolled < video1_end) {
$("#video1")[0].play();
} else {
$("#video1")[0].pause();
}
if (scrolled > video2_pos && scrolled < video2_end) {
$("#video2")[0].play();
} else {
$("#video2")[0].pause();
}
});
});
</script>
</body>
</html>