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badabingbreda/youtube_defer_loading.html

Created November 10, 2018 08:28
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Youtube defer loading to click
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youtube_defer_loading.html
<html>
<head>
<title>Youtube defer loading</title>
<!-- CSS -->
<style>
.youtube {
background-color: #000;
margin-bottom: 30px;
position: relative;
padding-top: 56.25%;
overflow: hidden;
cursor: pointer;
}
.youtube img {
width: 100%;
top: -16.84%;
left: 0;
opacity: 0.7;
}
.youtube .play-button {
width: 90px;
height: 60px;
background-color: #333;
box-shadow: 0 0 30px rgba( 0,0,0,0.6 );
z-index: 1;
opacity: 0.8;
border-radius: 6px;
}
.youtube .play-button:before {
content: "";
border-style: solid;
border-width: 15px 0 15px 26.0px;
border-color: transparent transparent transparent #fff;
}
.youtube img,
.youtube .play-button {
cursor: pointer;
}
.youtube img,
.youtube iframe,
.youtube .play-button,
.youtube .play-button:before {
position: absolute;
}
.youtube .play-button,
.youtube .play-button:before {
top: 50%;
left: 50%;
transform: translate3d( -50%, -50%, 0 );
}
.youtube iframe {
height: 100%;
width: 100%;
top: 0;
left: 0;
}
</style>
</head>
<body>
<!-- HTML TEMPLATE -->
<!-- (1) video wrapper -->
<div style="max-width:400px;">
<div class="youtube" data-embed="DLzxrzFCyOs">
<!-- (2) the "play" button -->
<div class="play-button"></div>
</div>
</div>
<!-- JAVASCRIPT -->
<script type="text/javascript">
/* Timing is important! load on document.ready or just before body closes otherwise the js won't load anything */
( function() {
var youtube = document.querySelectorAll( ".youtube" );
for (var i = 0; i < youtube.length; i++) {
var source = "https://img.youtube.com/vi/"+ youtube[i].dataset.embed +"/default.jpg"; // default | medium | high | standard | maxres
console.log(source);
var image = new Image();
image.src = source;
image.addEventListener( "load", function() {
youtube[ i ].appendChild( image );
}( i ) );
youtube[i].addEventListener( "click", function() {
var iframe = document.createElement( "iframe" );
iframe.setAttribute( "frameborder", "0" );
iframe.setAttribute( "allowfullscreen", "" );
iframe.setAttribute( "src", "https://www.youtube.com/embed/"+ this.dataset.embed +"?rel=0&showinfo=0&autoplay=1" );
this.innerHTML = "";
this.appendChild( iframe );
} );
};
} )();
</script>
</body>
</html>
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