Responsive image replacement

Check out the example here.

resonsive-img.js is a lightweight plugin for fast, clean and easy responsive image replacement using to the viewport your visitor's browser. This way you can reduce the payload for your users by only letting them download the appropriate images for their device.

Have a look at the blog post here for a more in-depth description.

Usage

####Setting it up

To start using the plugin we only have to include the script in the footer of our document.

<script src='responsive-img.min.js'></script>

####HTML Structure

In the data-src attribute we specify the different breakpoints in combination with the image source it should use. In the data-src-base(optional) attribute we specify the base of our source urls.

<img alt='kitten!' data-src-base='demo/images/' data-src='<480:smallest.jpg,
													 	  <768:small.jpg,
													 	  <960:medium.jpg,
													 	  >960:big.jpg' />

Using the HTML above the browser would load demo/images/smallest.jpg if the size of the viewport is below 480 pixels, demo/images/small.jpg if the size of the viewport is above 480 pixels and below 768 pixels, demo/images/medium.jpg if the size of viewport above 768 pixels and below 960 pixels and demo/images/big.jpg if the size of viewport above 960 pixels.

Let's also create a fallback for non-javascript browsers:

<noscript><img alt='kitten!' src='demo/images/medium.jpg' /></noscript>

That's all! We're up and running! ;)

Options

The only required option is the data-src attribute. All of the options below can be used additionally.

Name	Type	Description
data-src-base	attribute	Adds a specified path before every image source path
data-src2x	attribute	Can be used instead of data-src if devicePixelRatio is above 1.2 (retina displays). Syntax is the same as data-src.
data-src-base2x	attribute	Can be used instead of data-src-base to specify a custom base path for devices were devicePixelRatio is above 1.2 (retina displays). Can be used in combination with both data-src and data-src-base or either one

Browser support

There are no known unsupported browsers. The plugin has currently been tested in the following browsers:

####Desktop

Browser	Status
IE 11 Desktop	Works!
IE 11 Release Preview	Works!
IE 10	Works!
IE 9	Works!
IE 8	Works!
IE 7	Works!
IE 6	Works!
IE 5 (IE 10 desktop documentmode)	Works!
Opera 10.6	Works!
Opera 12.16	Works!
Opera 15.0	Works!
Opera 18.0 dev	Works!
Safari 4.0	Works!
Safari 5.0	Works!
Safari 5.1	Works!
Firefox 3	Works!
Firefox 12	Works!
Firefox 24	Works!
Firefox 26 aurora	Works!
Chome 14	Works!
Chome 19	Works!
Chome 30	Works!
Chome 31 dev	Works!

####Mobile

OS	Status
Windows Phone 8.0 (IE 10 desktop documentmode)	Works!
Windows Phone 7.0 (IE 10 desktop documentmode)	Works!
Android 1.5	Works!
Android 1.6	Works!
Android 2.2	Works!
Android 2.3	Works!
Android 4.0	Works!
Android 4.0 (tablet)	Works!
Android 4.1	Works!
Opera Mobile	Works!
iOS 3.0	Works!
iOS 3.2 (tablet)	Works!
iOS 4.0	Works!
iOS 4.3.2 (tablet)	Works!
iOS 5.1	Works!
iOS 6.0	Works!
iOS 7.0	Works!

####Notes

######iOS Without meta width=device-width; some mobile devices will apply a standard width to it's viewport of 960px and return this to the javascript. This might cause the script to load an image which is to big for your visitors screen. Make sure to set a meta tag with width=device-width; in your website's head.

Comments

Let me know if you have idea’s or notice something, I would love to hear your feedback!