https://www.rvsq.com/wp-content/themes/rvsq-md-new/js/preloadCssImages.jQuery_v5.js?ver=6.9.8

1/**
2 * jQuery-Plugin "preloadCssImages"
3 * by Scott Jehl, [email protected]
4 * http://www.filamentgroup.com
5 * reference article: http://www.filamentgroup.com/lab/update_automatically_preload_images_from_css_with_jquery/
6 * demo page: http://www.filamentgroup.com/examples/preloadImages/index_v2.php
7 * 
8 * Copyright (c) 2008 Filament Group, Inc
9 * Dual licensed under the MIT (filamentgroup.com/examples/mit-license.txt) and GPL (filamentgroup.com/examples/gpl-license.txt) licenses.
10 *
11 * Version: 5.0, 10.31.2008
12 * Changelog:
13 * 	02.20.2008 initial Version 1.0
14 *    06.04.2008 Version 2.0 : removed need for any passed arguments. Images load from any and all directories.
15 *    06.21.2008 Version 3.0 : Added options for loading status. Fixed IE abs image path bug (thanks Sam Pohlenz).
16 *    07.24.2008 Version 4.0 : Added support for @imported CSS (credit: http://marcarea.com/). Fixed support in Opera as well. 
17 *    10.31.2008 Version: 5.0 : Many feature and performance enhancements from trixta
18 * --------------------------------------------------------------------
19 */
20
21;jQuery.preloadCssImages = function(settings){
22	settings = jQuery.extend({
23		statusTextEl: null,
24		statusBarEl: null,
25		errorDelay: 999, // handles 404-Errors in IE
26		simultaneousCacheLoading: 2
27	}, settings);
28	var allImgs = [],
29		loaded = 0,
30		imgUrls = [],
31		thisSheetRules,	
32		errorTimer;
33	
34	function onImgComplete(){
35		clearTimeout(errorTimer);
36		if (imgUrls && imgUrls.length && imgUrls[loaded]) {
37			loaded++;
38			if (settings.statusTextEl) {
39				var nowloading = (imgUrls[loaded]) ? 
40					'Now Loading: <span>' + imgUrls[loaded].split('/')[imgUrls[loaded].split('/').length - 1] : 
41					'Loading complete'; // wrong status-text bug fixed
42				jQuery(settings.statusTextEl).html('<span class="numLoaded">' + loaded + '</span> of <span class="numTotal">

42' + imgUrls.length + '</span> loaded (<span class="percentLoaded">' + (loaded / imgUrls.length * 100).toFixed(0) + '%</span>) <span class="currentImg">' + nowloading + '</span></span>');
43			}
44			if (settings.statusBarEl) {
45				var barWidth = jQuery(settings.statusBarEl).width();
46				jQuery(settings.statusBarEl).css('background-position', -(barWidth - (barWidth * loaded / imgUrls.length).toFixed(0)) + 'px 50%');
47			}
48			loadImgs();
49		}
50	}
51	
52	function loadImgs(){
53		//only load 1 image at the same time / most browsers can only handle 2 http requests, 1 should remain for user-interaction (Ajax, other images, normal page requests...)
54		// otherwise set simultaneousCacheLoading to a higher number for simultaneous downloads
55		if(imgUrls && imgUrls.length && imgUrls[loaded]){
56			var img = new Image(); //new img obj
57			img.src = imgUrls[loaded];	//set src either absolute or rel to css dir
58			if(!img.complete){
59				jQuery(img).bind('error load onreadystatechange', onImgComplete);
60			} else {
61				onImgComplete();
62			}
63			errorTimer = setTimeout(onImgComplete, settings.errorDelay); // handles 404-Errors in IE
64		}
65	}
66	
67	function parseCSS(sheets, urls) {
68		var w3cImport = false,
69			imported = [],
70			importedSrc = [],
71			baseURL;
72		var sheetIndex = sheets.length;
73		while(sheetIndex--){//loop through each stylesheet
74			
75			var cssPile = '';//create large string of all css rules in sheet
76			
77			if(urls && urls[sheetIndex]){
78				baseURL = urls[sheetIndex];
79			} else {
80				var csshref = (sheets[sheetIndex].href) ? sheets[sheetIndex].href : 'window.location.href';
81				var baseURLarr = csshref.split('/');//split href at / to make array
82				baseURLarr.pop();//remove file path from baseURL array
83				baseURL = baseURLarr.join('/');//create base url for the images in this sheet (css file's dir)
84				if (baseURL) {
85					baseURL += '/'; //tack on a / if needed
86				}
87			}
88			if(sheets[sheetIndex].cssRules || sheets[sheetIndex].rules){
89				thisSheetRules = (sheets[sheetIndex].cssRules) ? //->>> http://www.quirksmode.org/dom/w3c_css.html
90					sheets[sheetIndex].cssRules : //w3
91					sheets[sheetIndex].rules; //ie 
92				var ruleIndex = thisSheetRules.length;
93				while(ruleIndex--){
94					if(thisSheetRules[ruleIndex].style && thisSheetRules[ruleIndex].style.cssText){
95						var text = thisSheetRules[ruleIndex].style.cssText;
96						if(text.toLowerCase().indexOf('url') != -1){ // only add rules to the string if you can assume, to find an image, speed improvement
97							cssPile += text; // thisSheetRules[ruleIndex].style.cssText instead of thisSheetRules[ruleIndex].cssText is a huge speed improvement
98						}
99					} else if(thisSheetRules[ruleIndex].styleSheet) {
100						imported.push(thisSheetRules[ruleIndex].styleSheet);
101						w3cImport = true;
102					}
103					
104				}
105			}
106			//parse cssPile for image urls
107			var tmpImage = cssPile.match(/[^\("]+\.(gif|jpg|jpeg|png)/g);//reg ex to get a string of between a "(" and a ".filename" / '"' for opera-bugfix
108			if(tmpImage){
109				var i = tmpImage.length;
110				while(i--){ // handle baseUrl here for multiple stylesheets in different folders bug
111					var imgSrc = (tmpImage[i].charAt(0) == '/' || tmpImage[i].match('://')) ? // protocol-bug fixed
112						tmpImage[i] : 
113						baseURL + tmpImage[i];
114					
115					if(jQuery.inArray(imgSrc, imgUrls) == -1){
116						imgUrls.push(imgSrc);
117					}
118				}
119			}
120			
121			if(!w3cImport && sheets[sheetIndex].imports && sheets[sheetIndex].imports.length) {
122				for(var iImport = 0, importLen = sheets[sheetIndex].imports.length; iImport < importLen; iImport++){
123					var iHref = sheets[sheetIndex].imports[iImport].href;
124					iHref = iHref.split('/');
125					iHref.pop();
126					iHref = iHref.join('/');
127					if (iHref) {
128						iHref += '/'; //tack on a / if needed
129					}
130					var iSrc = (iHref.charAt(0) == '/' || iHref.match('://')) ? // protocol-bug fixed
131						iHref : 
132						baseURL + iHref;
133					
134					importedSrc.push(iSrc);
135					imported.push(sheets[sheetIndex].imports[iImport]);
136				}
137				
138				
139			}
140		}//loop
141		if(imported.length){
142			parseCSS(imported, importedSrc);
143			return false;
144		}
145		var downloads = settings.simultaneousCacheLoading;
146		while( downloads--){
147			setTimeout(loadImgs, downloads);
148		}
149	}
150	parseCSS(document.styleSheets);
151	return imgUrls;
152};