Tutorial How to Install Lazy Load Image And Responsive Youtube Embed Video

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Lazy Load Image And Responsive Youtube Embed Video With Javascript LazySize.js | Tutorial blog today we will make pure javascript to automatically add class = "lazyload" and change the src attribute into data-src attribute of the image and iframe Youtube and automatically convert Youtube video iframe be responsive.

With pure javascript, then do not need jquery library so that blogs that do not use the library jquey can use lazy load with lazysize.js because lazysize.js itself does not require jquery library.

Who wants to try it please copy the code below and save the above code </body>. 

<script async='async' src='https://cdn.rawgit.com/aFarkas/lazysizes/gh-pages/lazysizes.min.js' type='text/javascript'></script>
<script>
//<![CDATA[
for(var imgEl=document.getElementsByTagName("img"),i=0;i<imgEl.length;i++)imgEl[i].getAttribute("src")&&(imgEl[i].setAttribute("data-src",imgEl[i].getAttribute("src")),imgEl[i].className+=" lazyload",imgEl[i].setAttribute("src","data:image/png;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs="));

function wrap(top, selector, bottom) {
var videos = document.querySelectorAll(selector);
    for (var i = 0; i < videos.length; i++) {
        if (videos[i].getAttribute('src')) {
            videos[i].setAttribute('data-src', videos[i].getAttribute('src'));
            videos[i].removeAttribute('src');
        }
        videos[i].setAttribute("class","lazyload");
        videos[i].setAttribute("style", "position: absolute; top: 0px; left: 0px; width: 100%; height: 100%; border: 0px;");
        var modified = top + videos[i].outerHTML + bottom;
        videos[i].outerHTML = modified;
    }
}
wrap("<div style='position:relative;padding-bottom:56.25%;height:0;overflow:hidden;margin:0 auto;width:100%'>", "iframe[src*='youtube.com']", "</div>");
//]]>
</script>

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