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67 lines
2.0 KiB
JavaScript
67 lines
2.0 KiB
JavaScript
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/*! Picturefill - Responsive Images that work today. (and mimic the proposed Picture element with span elements). Author: Scott Jehl, Filament Group, 2012 | License: MIT/GPLv2 */
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(function( w ){
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// Enable strict mode
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"use strict";
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w.picturefill = function() {
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var ps = w.document.getElementsByTagName( "span" );
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// Loop the pictures
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for( var i = 0, il = ps.length; i < il; i++ ){
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if( ps[ i ].getAttribute( "data-picture" ) !== null ){
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var sources = ps[ i ].getElementsByTagName( "span" ),
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matches = [];
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// See if which sources match
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for( var j = 0, jl = sources.length; j < jl; j++ ){
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var media = sources[ j ].getAttribute( "data-media" );
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// if there's no media specified, OR w.matchMedia is supported
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if( !media || ( w.matchMedia && w.matchMedia( media ).matches ) ){
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matches.push( sources[ j ] );
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}
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}
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// Find any existing img element in the picture element
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var picImg = ps[ i ].getElementsByTagName( "img" )[ 0 ];
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if( matches.length ){
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var matchedEl = matches.pop();
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if( !picImg || picImg.parentNode.nodeName === "NOSCRIPT" ){
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picImg = w.document.createElement( "img" );
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picImg.alt = ps[ i ].getAttribute( "data-alt" );
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}
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else if( matchedEl === picImg.parentNode ){
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// Skip further actions if the correct image is already in place
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continue;
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}
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picImg.src = matchedEl.getAttribute( "data-src" );
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matchedEl.appendChild( picImg );
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picImg.removeAttribute("width");
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picImg.removeAttribute("height");
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}
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else if( picImg ){
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picImg.parentNode.removeChild( picImg );
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}
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}
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}
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};
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// Run on resize and domready (w.load as a fallback)
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if( w.addEventListener ){
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w.addEventListener( "resize", w.picturefill, false );
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w.addEventListener( "DOMContentLoaded", function(){
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w.picturefill();
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// Run once only
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w.removeEventListener( "load", w.picturefill, false );
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}, false );
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w.addEventListener( "load", w.picturefill, false );
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}
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else if( w.attachEvent ){
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w.attachEvent( "onload", w.picturefill );
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}
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}( this ));
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