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Lazy Load YouTube And Other Videos In Website | StackCoder


Lazy Load YouTube And Other Videos In Website


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In this article lets learn simple steps to lazy load YouTube videos or any other videos. Once your website loads and if contains any YouTube or any other videos then the website loads longer than usual which has a huge impact on your users.


Solution


We will include the video thumbnail and on click of the thumbnail we will load the video. This drastically improves website loading and retaining most of your users


We will cover the following

  1. HTML
  2. CSS
  3. Javascript
  4. Any YouTube Video Thumbnail Code


NOTE: Code available at GitHub Lazy Load YouTube And Other Videos In Website

Step 1 - HTML


First let's add the HTML template with YouTube video thumbnail.


<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Lazy Load YouTube Videos</title>
    <!-- Video loading CSS style -->
    <link rel="stylesheet" href="video-loader.css">
</head>
<body>
    <div class="container">
        <!-- Adding original source in data-src -->
        <div class="video-wrapper" data-src="https://www.youtube.com/embed/R5ntdxOZ70E">
            <!-- Loading video thumbnail -->
            <img class="video-image" src="https://img.youtube.com/vi/R5ntdxOZ70E/hqdefault.jpg" />
        </div>
    </div>

    <!-- Video loading JS script -->
    <script src="video-loader.js"></script>
</body>
</html>

Step 2 - CSS


Responsive CSS to load youtube videos.


video-loader.css

.container {
    width: 480px;
    margin: 0 auto;
}
.video-wrapper {
    position: relative;
    padding-bottom: 56.25%;
    padding-top: 30px;
    height: 100%;
    overflow: hidden;
}
.video-image {
    cursor: pointer;
}
.video-play-btn {
    position: absolute;
    
}
.video {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

Step 3 - Javascript


We are looping through all the video wrapper and listening for the click event to occur. When the click event happens we will load the parent set data-src actual video source.


video-loader.js

function loadVideo(e){
    var parent = this.parentNode;
    var dataSrc = parent.getAttribute('data-src');
    parent.innerHTML = '<iframe class="video" src="'+ dataSrc +'" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>';
}
var videoImage = document.querySelectorAll('.video-wrapper .video-image');
for(var i = 0; i < videoImage.length; i++){
    videoImage[i].addEventListener('click', loadVideo);
}

Step 4 - Any YouTube Video Thumbnail Code


If you need any YouTube video thumbnail then you can use the following URLs. Make sure to just replace your YouTube video-id.


Default image thumbnail

https://img.youtube.com/vi/<insert-youtube-video-id-here>/default.jpg


High quality thumbnail

https://img.youtube.com/vi/<insert-youtube-video-id-here>/hqdefault.jpg


Medium quality thumbnail

https://img.youtube.com/vi/<insert-youtube-video-id-here>/mqdefault.jpg

Conclusion


NOTE: Code available at GitHub Lazy Load YouTube And Other Videos In Website


I hope this article helped you. Please share it with your friends.







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AUTHOR

Channaveer Hakari

I am a full-stack developer working at WifiDabba India Pvt Ltd. I started this blog so that I can share my knowledge and enhance my skills with constant learning.

Never stop learning. If you stop learning, you stop growing