https://portal.mariacollege.edu/ICS/UI/Common/Scripts/jquery.lightbox.js

1
2(function($){
3	var opts;
4
5	$.fn.lightbox = function(options){
6		// build main options
7		opts = $.extend({}, $.fn.lightbox.defaults, options);
8
9		// initalize the lightbox
10		$.fn.lightbox.initialize();
11		return this.each(function(){
12			$(this).click(function(){
13				$(this).lightbox.start(this);
14				return false;
15			});
16		});
17	};
18
19	// lightbox functions
20	$.fn.lightbox.initialize = function(){
21		$('#overlay').remove();
22		$('#lightbox').remove();
23		opts.inprogress = false;
24		var outerImage = '<div id="outerImageContainer"><div id="imageContainer"><img id="lightboxImage" alt="Lightbox Image"><div id="hoverNav"><a href="javascript://" id="prevLink"><span class="sr-only">Previous image</span></a><a href="javascript://" id="nextLink"><span class="sr-only">Next image</span></a></div><div id="loading"><a href="javascript://" id="loadingLink"><img src="' + opts.fileLoadingImage + '" alt="Loading image"></a></div></div></div>';
25		var imageData = '<div id="imageDataContainer" class="clearfix"><div id="imageData"><div id="imageDetails"><span id="caption"></span><span id="numberDisplay"></span></div><div id="bottomNav">'
26
27		if (opts.displayHelp)
28			imageData += '<span id="helpDisplay">' + opts.strings.help + '</span>';
29
30		imageData += '<a href="javascript://" id="bottomNavClose" title="' + opts.strings.closeTitle + '"><img src="'+opts.fileBottomNavCloseImage+'" alt="Close image"></a></div></div></div>';
31
32		var string;
33
34		if (opts.navbarOnTop) {
35		  string = '<div id="overlay"></div><div id="lightbox">' + imageData + outerImage + '</div>';
36		  $("body").append(string);
37		  $("#imageDataContainer").addClass('ontop');
38		} else {
39		  string = '<div id="overlay"></div><div id="lightbox">' + outerImage + imageData + '</div>';
40		  $("body").append(string);
41		}
42
43		$("#overlay").click(function(){ $.fn.lightbox.end(); }).hide();
44		$("#lightbox").click(function(){ $.fn.lightbox.end();}).hide();
45		$("#loadingLink").click(function(){ $.fn.lightbox.end(); return false;});
46		$("#bottomNavClose").click(function(){ $.fn.lightbox.end(); return false; });
47		$('#outerImageContainer').width(opts.widthCurrent).height(opts.heightCurrent);
48		$('#imageDataContainer').width(opts.widthCurrent);
49	};
50
51	$.fn.lightbox.getPageSize = function(){
52		var xScroll, yScroll;
53
54		if (window.innerHeight && window.scrollMaxY) {
55			xScroll = window.innerWidth + window.scrollMaxX;
56			yScroll = window.innerHeight + window.scrollMaxY;
57		} else if (document.body.scrollHeight > document.body.offsetHeight){ // all but Explorer Mac
58			xScroll = document.body.scrollWidth;
59			yScroll = document.body.scrollHeight;
60		} else { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari
61			xScroll = document.body.offsetWidth;
62			yScroll = document.body.offsetHeight;
63		}
64
65		var windowWidth, windowHeight;
66
67		if (self.innerHeight) { // all except Explorer
68			if(document.documentElement.clientWidth){
69				windowWidth = document.documentElement.clientWidth;
70			} else {
71				windowWidth = self.innerWidth;
72			}
73			windowHeight = self.innerHeight;
74		} else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict Mode
75			windowWidth = document.documentElement.clientWidth;
76			windowHeight = document.documentElement.clientHeight;
77		} else if (document.body) { // other Explorers
78			windowWidth = document.body.clientWidth;
79			windowHeight = document.body.clientHeight;
80		}
81
82		// for small pages with total height less then height of the viewport
83		if(yScroll < windowHeight){
84			pageHeight = windowHeight;
85		} else {
86			pageHeight = yScroll;
87		}
88
89
90		// for small pages with total width less then width of the viewport
91		if(xScroll < windowWidth){
92			pageWidth = xScroll;
93		} else {
94			pageWidth = windowWidth;
95		}
96
97		var arrayPageSize = new Array(pageWidth,pageHeight,windowWidth,windowHeight);
98		return arrayPageSize;
99	};
100
101
102	$.fn.lightbox.getPageScroll = function(){
103		var xScroll, yScroll;
104
105		if (self.pageYOffset) {
106			yScroll = self.pageYOffset;
107			xScroll = self.pageXOffset;
108		} else if (document.documentElement && document.documentElement.scrollTop){  // Explorer 6 Strict
109			yScroll = document.documentElement.scrollTop;
110			xScroll = document.documentElement.scrollLeft;
111		} else if (document.body) {// all other Explorers
112			yScroll = document.body.scrollTop;
113			xScroll = document.body.scrollLeft;
114		}
115
116		var arrayPageScroll = new Array(xScroll,yScroll);
117		return arrayPageScroll;
118	};
119
120	$.fn.lightbox.pause = function(ms){
121		var date = new Date();
122		var curDate = null;
123		do{curDate = new Date();}
124		while( curDate - date < ms);
125	};
126
127	$.fn.lightbox.start = function(imageLink){
128
129		$("select, embed, object").hide();
130		var arrayPageSize = $.fn.lightbox.getPageSize();
131		$("#overlay").hide().css({width: '100%', height: arrayPageSize[1]+'px', opacity : opts.overlayOpacity}).fadeIn();
132		opts.imageArray = [];
133		imageNum = 0;
134
135		var anchors = document.getElementsByTagName( imageLink.tagName);
136
137		// if image is NOT part of a set..
138		if(!imageLink.rel || (imageLink.rel == '')){
139			// add single image to Lightbox.imageArray
140			opts.imageArray.push(new Array(imageLink.href, opts.displayTitle ? imageLink.title : ''));
141		} else {
142		// if image is part of a set..
143			$("a").each(function(){
144				if(this.href && (this.rel == imageLink.rel)){
145					opts.imageArray.push(new Array(this.href, opts.displayTitle ? this.title : ''));
146				}
147			})
148
149
150			for(i = 0; i < opts.imageArray.length; i++){
151				for(j = opts.imageArray.length-1; j>i; j--){
152					if(opts.imageArray[i][0] == opts.imageArray[j][0]){
153						opts.imageArray.splice(j,1);
154					}
155				}
156			}
157			while(opts.imageArray[imageNum][0] != imageLink.href) { imageNum++;}
158		}
159
160		// calculate top and left offset for the lightbox
161		var arrayPageScroll = $.fn.lightbox.getPageScroll();
162		var lightboxTop = arrayPageScroll[1] + (arrayPageSize[3] / 10);
163		var lightboxLeft = arrayPageScroll[0];
164		$('#lightbox').css({top: lightboxTop+'px', left: lightboxLeft+'px'}).show();
165
166
167		if (!opts.slideNavBar)
168			$('#imageData').hide();
169
170		$.fn.lightbox.changeImage(imageNum);
171
172	};
173
174	$.fn.lightbox.changeImage = function(imageNum){
175		if(opts.inprogress == false){
176			opts.inprogress = true;
177			opts.activeImage = imageNum;	// update global var
178
179			// hide elements during transition
180			$('#loading').show();
181			$('#lightboxImage').hide();
182			$('#hoverNav').hide();
183			$('#prevLink').hide();
184			$('#nextLink').hide();
185
186			if (opts.slideNavBar) { // delay preloading image until navbar will slide up
187				// $('#imageDataContainer').slideUp(opts.navBarSlideSpeed, $.fn.doChangeImage);
188				$('#imageDataContainer').hide();
189				$('#imageData').hide();
190				$.fn.doChangeImage();
191			} else {
192			    $.fn.doChangeImage();
193			}
194		}
195	};
196
197	$.fn.doChangeImage = function(){
198
199		imgPreloader = new Image();
200
201		// once image is preloaded, resize image container
202		imgPreloader.onload=function(){
203		    var newWidth = imgPreloader.width;
204		    var newHeight = imgPreloader.height;
205
206
207			if (opts.fitToScreen) {
208		        var arrayPageSize = $.fn.lightbox.getPageSize();
209				var ratio;
210				var initialPageWidth = arrayPageSize[2] - 2 * opts.borderSize;
211				var initialPageHeight = arrayPageSize[3] - 200;
212
213				if (imgPreloader.height > initialPageHeight)
214				{
215					newWidth = parseInt((initialPageHeight/imgPreloader.height) * imgPreloader.width);
216					newHeight = initialPageHeight;
217				}
218				else if (imgPreloader.width > initialPageWidth)
219				{
220					newHeight = parseInt((initialPageWidth/imgPreloader.width) * imgPreloader.height);
221					newWidth = initialPageWidth;
222				}
223			}
224
225			$('#lightboxImage').attr('src', opts.imageArray[opts.activeImage][0])
226							   .width(newWidth).height(newHeight);

227			$.fn.lightbox.resizeImageContainer(newWidth, newHeight);
228		}
229
230		imgPreloader.src = opts.imageArray[opts.activeImage][0];
231	}
232	
233	$.fn.lightbox.end = function(){
234		$.fn.lightbox.disableKeyboardNav();
235		$('#lightbox').hide();
236		$('#overlay').fadeOut();
237		$('select, object, embed').show();
238	};
239
240	$.fn.lightbox.preloadNeighborImages = function(){
241		if((opts.imageArray.length - 1) > opts.activeImage){
242			preloadNextImage = new Image();
243			preloadNextImage.src = opts.imageArray[opts.activeImage + 1][0];
244		}
245		if(opts.activeImage > 0){
246			preloadPrevImage = new Image();
247			preloadPrevImage.src = opts.imageArray[opts.activeImage - 1][0];
248		}
249	};
250
251	$.fn.lightbox.keyboardAction = function(e){
252		if (e == null) { // ie
253			var keycode = event.keyCode;
254			var escapeKey = 27;
255		} else { // mozilla
256			var keycode = e.keyCode;
257			var escapeKey = e.DOM_VK_ESCAPE;
258		}
259
260		var key = String.fromCharCode(keycode).toLowerCase();
261
262		if((key == 'x') || (key == 'o') || (key == 'c') || (keycode == escapeKey)){ // close lightbox
263			$.fn.lightbox.end();
264		} else if((key == 'p') || (keycode == 37)){ // display previous image
265			if(opts.activeImage != 0){
266				$.fn.lightbox.disableKeyboardNav();
267				$.fn.lightbox.changeImage(opts.activeImage - 1);
268			}
269		} else if((key == 'n') || (keycode == 39)){ // display next image
270			if(opts.activeImage != (opts.imageArray.length - 1)){
271				$.fn.lightbox.disableKeyboardNav();
272				$.fn.lightbox.changeImage(opts.activeImage + 1);
273			}
274		}
275	};
276
277	$.fn.lightbox.resizeImageContainer = function(imgWidth, imgHeight){
278		// get current width and height
279		opts.widthCurrent = document.getElementById('outerImageContainer').offsetWidth;
280		opts.heightCurrent = document.getElementById('outerImageContainer').offsetHeight;
281
282		// get new width and height
283		var widthNew = (imgWidth  + (opts.borderSize * 2));
284		var heightNew = (imgHeight  + (opts.borderSize * 2));
285
286		// scalars based on change from old to new
287		opts.xScale = ( widthNew / opts.widthCurrent) * 100;
288		opts.yScale = ( heightNew / opts.heightCurrent) * 100;
289
290		// calculate size difference between new and old image, and resize if necessary
291		wDiff = opts.widthCurrent - widthNew;
292		hDiff = opts.heightCurrent - heightNew;
293
294		$('#imageDataContainer').animate({width: widthNew},opts.resizeSpeed,'linear');
295		$('#outerImageContainer').animate({width: widthNew},opts.resizeSpeed,'linear',function(){
296			$('#outerImageContainer').animate({height: heightNew},opts.resizeSpeed,'linear',function(){
297				$.fn.lightbox.showImage();
298			});
299		});
300
301
302		// if new and old image are same size and no scaling transition is necessary,
303		// do a quick pause to prevent image flicker.
304		if((hDiff == 0) && (wDiff == 0)){
305			if (jQuery.browser.msie){ $.fn.lightbox.pause(250); } else { $.fn.lightbox.pause(100);}
306		}
307
308		$('#prevLink').height(imgHeight);
309		$('#nextLink').height(imgHeight);
310	};
311
312	$.fn.lightbox.showImage = function(){
313		$('#loading').hide();
314		$('#lightboxImage').fadeIn("fast");
315		$.fn.lightbox.updateDetails();
316		$.fn.lightbox.preloadNeighborImages();
317
318		opts.inprogress = false;
319	};
320
321	$.fn.lightbox.updateDetails = function(){
322
323		if(opts.imageArray[opts.activeImage][1]){
324			$('#caption').html(opts.imageArray[opts.activeImage][1]).show();
325		}
326
327		// if image is part of set display 'Image x of x'
328		if(opts.imageArray.length > 1){
329			var nav_html;
330
331			nav_html = opts.strings.image + (opts.activeImage + 1) + opts.strings.of + opts.imageArray.length;
332
333			// display previous / next text links
334			if ((opts.activeImage) > 0) {
335				nav_html = '<a title="' + opts.strings.prevLinkTitle + '" href="#" id="prevLinkText">' + opts.strings.prevLinkText + "</a>" + nav_html;
336			}
337
338			if ((opts.activeImage + 1) < opts.imageArray.length) {
339				nav_html += '<a title="' + opts.strings.nextLinkTitle + '" href="#" id="nextLinkText">' + opts.strings.nextLinkText + "</a>";
340			}
341
342			$('#numberDisplay').html(nav_html).show();
343		}
344
345		if (opts.slideNavBar) {
346		    $("#imageData").slideDown(opts.navBarSlideSpeed);
347		} else {
348			$("#imageData").show();
349		}
350
351		var arrayPageSize = $.fn.lightbox.getPageSize();
352		$('#overlay').height(arrayPageSize[1]);
353		$.fn.lightbox.updateNav();
354	};
355
356	$.fn.lightbox.updateNav = function(){
357		$('#hoverNav').show();
358
359		// if not first image in set, display prev image button
360		if(opts.activeImage != 0){
361			$('#prevLink,#prevLinkText').show().click(function(){
362				$.fn.lightbox.changeImage(opts.activeImage - 1); return false;
363			});
364		}
365
366		// if not last image in set, display next image button
367		if(opts.activeImage != (opts.imageArray.length - 1)){
368			$('#nextLink,#nextLinkText').show().click(function(){
369
370				$.fn.lightbox.changeImage(opts.activeImage +1); return false;
371			});
372		}
373
374		$.fn.lightbox.enableKeyboardNav();
375	};
376
377
378	$.fn.lightbox.enableKeyboardNav = function(){
379		document.onkeydown = $.fn.lightbox.keyboardAction;
380	};
381
382	$.fn.lightbox.disableKeyboardNav = function(){
383		document.onkeydown = '';
384	};
385
386	$.fn.lightbox.defaults = {
387		fileLoadingImage : 'images/loading.gif',
388		fileBottomNavCloseImage : 'images/closelabel.gif',
389		overlayOpacity : 0.8,
390		borderSize : 10,
391		imageArray : new Array,
392		activeImage : null,
393		inprogress : false,
394		resizeSpeed : 350,
395		widthCurrent: 250,
396		heightCurrent: 250,
397		xScale : 1,
398		yScale : 1,
399		displayTitle: true,
400		navbarOnTop: false,
401		slideNavBar: false, // slide nav bar up/down between image resizing transitions
402		navBarSlideSpeed: 350,
403		displayHelp: false,
404		strings : {
405			help: ' \u2190 / P - previous image\u00a0\u00a0\u00a0\u00a0\u2192 / N - next image\u00a0\u00a0\u00a0\u00a0ESC / X - close image gallery',
406			prevLinkTitle: 'previous image',
407			nextLinkTitle: 'next image',
408			prevLinkText:  '&laquo; Previous',
409			nextLinkText:  'Next &raquo;',
410			closeTitle: 'close image gallery',
411			image: 'Image ',
412			of: ' of '
413		},
414		fitToScreen: false		// resize images if they are bigger than window
415	};
416})(jQuery);