Lazy Loading and Multi-serving Image Plugin with jQuery - lazyResp

lazyResp is a jQuery plugin designed for responsive web layout that deals with responsive image delivery depending on screen width, with Retina and image lazy load support.

How to use it:

1. Load jQuery library and the jQuery lazyResp plugin in the document.

<script src="//code.jquery.com/jquery-1.11.1.min.js"></script>
<script src="jquery.lazyresp.min.js"></script>

2. Insert an image into your document and use data-* attributes to specify the image sources for different screen widths.

<img src="480x360.jpg" height="250" width="250" class="lazyResp"
     data-small-retina="960x720.jpg" 
     data-medium="1024x768.jpg" 
     data-medium-retina="2048x1536.jpg" 
     data-large="1920x1440.jpg" 
     data-large-retina="2560x1920.jpg"
>

3. Call the plugin on the image. The plugin will automatically swap out the src of the image depending on screen widths (breakpoints) defined in the plugin settings.

$(window).load( function() { 
  $('img').lazyResp({
    medium: 640,
    large: 1024,
    retina: 1.01,
    tolerance: 0,
    lazy: true,
    beforeLoad: function (img, preloaded) {},
    afterLoad: function (img, preloaded) {}
});
});

Change logs:

2014-12-13

• Added a new call to getRightImageSize when the plugin is called more than once on the same element and lazyload set to false
• Added a new call to both beforeLoad and afterLoad with a custom preloaded attr when the image has already been loaded

2014-11-27

• multiple fix

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This awesome jQuery plugin is developed by micc83. For more Advanced Usages, please check the demo page or visit the official website.