I am interested in setting up an HTML page with multiple video clips such that each video clip plays only while visible and then pauses when out of view.
I have found this great example of how this can be implemented with one clip, but I have been unable to modify the code to work with multiple clips. Perhaps I need to convert this code into a function for easy re-usability?
Here is what I have so far (JS Bin linked above modified for 2 clips instead of one).
This code seems to work for only one of the two clips.
<!DOCTYPE html>
<html>
<!-- Created using jsbin.com Source can be edited via http://jsbin.com/ocupor/1/edit
-->
<head>
<meta charset=utf-8 />
<title>JS Bin</title>
<style>
#right {
position: absolute;
top: 2000px;
}
#video1 {
position: absolute;
left: 2000px;
top: 2000px;
}
#video2 {
position: absolute;
left: 2000px;
top: 3000px;
}
</style>
<style id="jsbin-css">
</style>
</head>
#
<body style="width: 4000px; height: 4000px;">
<div id="info"></div>
<div id="down">
scroll down please...
</div>
<div id="right">
scroll right please...
</div>
<video id="video1">
<source src="http://video-js.zencoder.com/oceans-clip.mp4"/>
</video>
<script>
var video = document.getElementById('video1'), fraction = 0.8;
function checkScroll() {
var x = video.offsetLeft, y = video.offsetTop, w = video.offsetWidth, h = video.offsetHeight, r = x + w, //right
b = y + h, //bottom
visibleX, visibleY, visible;
visibleX = Math.max(0, Math.min(w, window.pageXOffset + window.innerWidth - x, r - window.pageXOffset));
visibleY = Math.max(0, Math.min(h, window.pageYOffset + window.innerHeight - y, b - window.pageYOffset));
visible = visibleX * visibleY / (w * h);
if (visible > fraction) {
video.play();
} else {
video.pause();
}
}
checkScroll();
window.addEventListener('scroll', checkScroll, false);
window.addEventListener('resize', checkScroll, false);
</script>
<video id="video2">
<source src="http://video-js.zencoder.com/oceans-clip.mp4"/>
</video>
<script>
var video = document.getElementById('video2'), fraction = 0.8;
function checkScroll() {
var x = video.offsetLeft, y = video.offsetTop, w = video.offsetWidth, h = video.offsetHeight, r = x + w, //right
b = y + h, //bottom
visibleX, visibleY, visible;
visibleX = Math.max(0, Math.min(w, window.pageXOffset + window.innerWidth - x, r - window.pageXOffset));
visibleY = Math.max(0, Math.min(h, window.pageYOffset + window.innerHeight - y, b - window.pageYOffset));
visible = visibleX * visibleY / (w * h);
if (visible > fraction) {
video.play();
} else {
video.pause();
}
} checkScroll();
window.addEventListener('scroll', checkScroll, false);
window.addEventListener('resize', checkScroll, false);
</script>
</body>
</html>
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