jquery.imagesloaded.js

/*!
 * jQuery imagesLoaded plugin v2.1.1
 * http://github.com/desandro/imagesloaded
 *
 * MIT License. by Paul Irish et al.
 */

/*jshint curly: true, eqeqeq: true, noempty: true, strict: true, undef: true, browser: true */
/*global jQuery: false */

;(function($, undefined) {
'use strict';

// blank image data-uri bypasses webkit log warning (thx doug jones)
var BLANK = 'data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///ywAAAAAAQABAAACAUwAOw==';

$.fn.imagesLoaded = function( callback ) {
	var $this = this,
		deferred = $.isFunction($.Deferred) ? $.Deferred() : 0,
		hasNotify = $.isFunction(deferred.notify),
		$images = $this.find('img').add( $this.filter('img') ),
		loaded = [],
		proper = [],
		broken = [];

	// Register deferred callbacks
	if ($.isPlainObject(callback)) {
		$.each(callback, function (key, value) {
			if (key === 'callback') {
				callback = value;
			} else if (deferred) {
				deferred[key](value);
			}
		});
	}

	function doneLoading() {
		var $proper = $(proper),
			$broken = $(broken);

		if ( deferred ) {
			if ( broken.length ) {
				deferred.reject( $images, $proper, $broken );
			} else {
				deferred.resolve( $images );
			}
		}

		if ( $.isFunction( callback ) ) {
			callback.call( $this, $images, $proper, $broken );
		}
	}

	function imgLoadedHandler( event ) {
		imgLoaded( event.target, event.type === 'error' );
	}

	function imgLoaded( img, isBroken ) {
		// don't proceed if BLANK image, or image is already loaded
		if ( img.src === BLANK || $.inArray( img, loaded ) !== -1 ) {
			return;
		}

		// store element in loaded images array
		loaded.push( img );

		// keep track of broken and properly loaded images
		if ( isBroken ) {
			broken.push( img );
		} else {
			proper.push( img );
		}

		// cache image and its state for future calls
		$.data( img, 'imagesLoaded', { isBroken: isBroken, src: img.src } );

		// trigger deferred progress method if present
		if ( hasNotify ) {
			deferred.notifyWith( $(img), [ isBroken, $images, $(proper), $(broken) ] );
		}

		// call doneLoading and clean listeners if all images are loaded
		if ( $images.length === loaded.length ) {
			setTimeout( doneLoading );
			$images.unbind( '.imagesLoaded', imgLoadedHandler );
		}
	}

	// if no images, trigger immediately
	if ( !$images.length ) {
		doneLoading();
	} else {
		$images.bind( 'load.imagesLoaded error.imagesLoaded', imgLoadedHandler )
		.each( function( i, el ) {
			var src = el.src;

			// find out if this image has been already checked for status
			// if it was, and src has not changed, call imgLoaded on it
			var cached = $.data( el, 'imagesLoaded' );
			if ( cached && cached.src === src ) {
				imgLoaded( el, cached.isBroken );
				return;
			}

			// if complete is true and browser supports natural sizes, try
			// to check for image status manually
			if ( el.complete && el.naturalWidth !== undefined ) {
				imgLoaded( el, el.naturalWidth === 0 || el.naturalHeight === 0 );
				return;
			}

			// cached images don't fire load sometimes, so we reset src, but only when
			// dealing with IE, or image is complete (loaded) and failed manual check
			// webkit hack from http://groups.google.com/group/jquery-dev/browse_thread/thread/eee6ab7b2da50e1f
			if ( el.readyState || el.complete ) {
				el.src = BLANK;
				el.src = src;
			}
		});
	}

	return deferred ? deferred.promise( $this ) : $this;
};

})(jQuery);