jQuery.picturefill

This is an implementation of Scott Jehl's scottjehl/picturefill wrapped as a jQuery plugin. It has been tested with jQuery 1.9 and utilizes Modernizr.mq() for testing media queries.

Why?

I decided to make this because I wasn't totally happy with the fact that the original picturefill looked for any div with a data-picture attribute. I often only had a handful of images that needed to be made responsive and I felt it would be better to target them individually or through any common selector. I usually use a class but data-attributes work just as well. Since most of my projects use jQuery and Modernizr, it made sense to work with those libraries.

Good to know

This plugin does not implement the listeners present in scottjehl/picturefill. It made more sense to me to allow these to be implemented on the developer's terms.

There is also a special query that can be passed to target high pixel density displays such as retina devices. By passing :highdensity as the media query, it will be replaced by (-webkit-min-device-pixel-ratio: 1.5), (min--moz-device-pixel-ratio: 1.5), (-o-min-device-pixel-ratio: 3/2), (min-device-pixel-ratio: 1.5), (min-resolution: 144dpi). Since it is such a long query with all the vendor specific properties, I thought it would be nice to not have to rewrite it.

Sample implementation

Your markup should be formatted the same as when using scottjehl/picturefill. The only difference is the above mentioned :highdensity "psuedo query" for when you want to target retina displays.

<div class="picture" data-alt="A giant stone face at The Bayon temple in Angkor Thom, Cambodia">
    <div data-src="small.jpg"></div>
    <div data-src="medium.jpg"     data-media="(min-width: 400px)"></div>
    <div data-src="large.jpg"      data-media="(min-width: 800px)"></div>
    <div data-src="extralarge.jpg" data-media="(min-width: 1000px)"></div>
    <div data-src="extralarge@2x.jpg" data-media=":highdensity"></div>

    <!-- Fallback content for non-JS browsers. Same img src as the initial, unqualified source element. -->
    <noscript>
        <img src="external/imgs/small.jpg" alt="A giant stone face at The Bayon temple in Angkor Thom, Cambodia">
    </noscript>
</div>

You can apply the picturefill with the following Javascript. It is up to you to decide when it's appropriate to call the function.

$('.client-logo').picturefill();