https://secure.accountsupport.com/secure/javascripts/lightbox.js

1/*
2	Lightbox JS: Fullsize Image Overlays 
3	by Lokesh Dhakar - http://www.huddletogether.com
4
5	For more information on this script, visit:
6	http://huddletogether.com/projects/lightbox/
7
8	Script featured on Dynamic Drive code library Jan 24th, 06':
9	http://www.dynamicdrive.com
10
11	Licensed under the Creative Commons Attribution 2.5 License - http://creativecommons.org/licenses/by/2.5/
12	(basically, do anything you want, just leave my name and link)
13	
14	Table of Contents
15	-----------------
16	Configuration
17	
18	Functions
19	- getPageScroll()
20	- getPageSize()
21	- pause()
22	- getKey()
23	- listenKey()
24	- showLightbox()
25	- hideLightbox()
26	- initLightbox()
27	- addLoadEvent()
28	
29	Function Calls
30	- addLoadEvent(initLightbox)
31
32*/
33
34
35
36//
37// Configuration
38//
39
40// If you would like to use a custom loading image or close button reference them in the next two lines.
41var loadingImage = '/secure/lightbox/loading.gif';		
42var closeButton = '/secure/lightbox/close.gif';		
43
44
45
46
47
48//
49// getPageScroll()
50// Returns array with x,y page scroll values.
51// Core code from - quirksmode.org
52//
53function getPageScroll(){
54
55	var yScroll;
56
57	if (self.pageYOffset) {
58		yScroll = self.pageYOffset;
59	} else if (document.documentElement && document.documentElement.scrollTop){	 // Explorer 6 Strict
60		yScroll = document.documentElement.scrollTop;
61	} else if (document.body) {// all other Explorers
62		yScroll = document.body.scrollTop;
63	}
64
65	arrayPageScroll = new Array('',yScroll) 
66	return arrayPageScroll;
67}
68
69
70
71//
72// getPageSize()
73// Returns array with page width, height and window width, height
74// Core code from - quirksmode.org
75// Edit for Firefox by pHaez
76//
77function getPageSize(){
78	
79	var xScroll, yScroll;
80	
81	if (window.innerHeight && window.scrollMaxY) {	
82		xScroll = document.body.scrollWidth;
83		yScroll = window.innerHeight + window.scrollMaxY;
84	} else if (document.body.scrollHeight > document.body.offsetHeight){ // all but Explorer Mac
85		xScroll = document.body.scrollWidth;
86		yScroll = document.body.scrollHeight;
87	} else { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari
88		xScroll = document.body.offsetWidth;
89		yScroll = document.body.offsetHeight;
90	}
91	
92	var windowWidth, windowHeight;
93	if (self.innerHeight) {	// all except Explorer
94		windowWidth = self.innerWidth;
95		windowHeight = self.innerHeight;
96	} else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict Mode
97		windowWidth = document.documentElement.clientWidth;
98		windowHeight = document.documentElement.clientHeight;
99	} else if (document.body) { // other Explorers
100		windowWidth = document.body.clientWidth;
101		windowHeight = document.body.clientHeight;
102	}	
103	
104	// for small pages with total height less then height of the viewport
105	if(yScroll < windowHeight){
106		pageHeight = windowHeight;
107	} else { 
108		pageHeight = yScroll;
109	}
110
111	// for small pages with total width less then width of the viewport
112	if(xScroll < windowWidth){	
113		pageWidth = windowWidth;
114	} else {
115		pageWidth = xScroll;
116	}
117
118
119	arrayPageSize = new Array(pageWidth,pageHeight,windowWidth,windowHeight) 
120	return arrayPageSize;
121}
122
123
124//
125// pause(numberMillis)
126// Pauses code execution for specified time. Uses busy code, not good.
127// Code from http://www.faqts.com/knowledge_base/view.phtml/aid/1602
128//
129function pause(numberMillis) {
130	var now = new Date();
131	var exitTime = now.getTime() + numberMillis;
132	while (true) {
133		now = new Date();
134		if (now.getTime() > exitTime)
135			return;
136	}
137}
138
139//
140// getKey(key)
141// Gets keycode. If 'x' is pressed then it hides the lightbox.
142//
143
144function getKey(e){
145	if (e == null) { // ie
146		keycode = event.keyCode;
147	} else { // mozilla
148		keycode = e.which;
149	}
150	key = String.fromCharCode(keycode).toLowerCase();
151	
152	if(key == 'x'){ hideLightbox(); }
153}
154
155
156//
157// listenKey()
158//
159function listenKey () {	document.onkeypress = getKey; }
160	
161
162//
163// showLightbox()
164// Preloads images. Pleaces new image in lightbox then centers and displays.
165//
166function showLightbox(objLink)
167{
168	// prep objects
169	var objOverlay = document.getElementById('overlay');
170	var objLightbox = document.getElementById('lightbox');
171	var objCaption = document.getElementById('lightboxCaption');
172	var objImage = document.getElementById('lightboxImage');
173	var objLoadingImage = document.getElementById('loadingImage');
174	var objLightboxDetails = document.getElementById('lightboxDetails');
175
176	
177	var arrayPageSize = getPageSize();
178	var arrayPageScroll = getPageScroll();
179
180	// center loadingImage if it exists
181	if (objLoadingImage) {
182		objLoadingImage.style.top = (arrayPageScroll[1] + ((arrayPageSize[3] - 35 - objLoadingImage.height) / 2) + 'px');
183		objLoadingImage.style.left = (((arrayPageSize[0] - 20 - objLoadingImage.width) / 2) + 'px');
184		objLoadingImage.style.display = 'block';
185	}
186
187	// set height of Overlay to take up whole page and show
188	objOverlay.style.height = (arrayPageSize[1] + 'px');
189	objOverlay.style.display = 'block';
190
191	// preload image
192	imgPreload = new Image();
193
194	imgPreload.onload=function(){
195		objImage.src = objLink.href;
196
197		// center lightbox and make sure that the top and left values are not negative
198		// and the image placed outside the viewport
199		var lightboxTop = arrayPageScroll[1] + ((arrayPageSize[3] - 35 - imgPreload.height) / 2);
200		var lightboxLeft = ((arrayPageSize[0] - 20 - imgPreload.width) / 2);
201		
202		objLightbox.style.top = (lightboxTop < 0) ? "0px" : lightboxTop + "px";
203		objLightbox.style.left = (lightboxLeft < 0) ? "0px" : lightboxLeft + "px";
204
205
206		objLightboxDetails.style.width = imgPreload.width + 'px';
207		
208		if(objLink.getAttribute('title')){
209			objCaption.style.display = 'block';
210			//objCaption.style.width = imgPreload.width + 'px';
211			objCaption.innerHTML = objLink.getAttribute('title');
212		} else {
213			objCaption.style.display = 'none';
214		}
215		
216		// A small pause between the image loading and displaying is required with IE,
217		// this prevents the previous image displaying for a short burst causing flicker.
218		if (navigator.appVersion.indexOf("MSIE")!=-1){
219			pause(250);
220		} 
221
222		if (objLoadingImage) {	objLoadingImage.style.display = 'none'; }
223		objLightbox.style.display = 'block';
224
225		// After image is loaded, update the overlay height as the new image might have
226		// increased the overall page height.
227		arrayPageSize = getPageSize();
228		objOverlay.style.height = (arrayPageSize[1] + 'px');
229		
230		// Check for 'x' keypress
231		listenKey();
232
233		return false;

234	}
235
236	imgPreload.src = objLink.href;
237	
238}
239
240
241
242
243
244//
245// hideLightbox()
246//
247function hideLightbox()
248{
249	// get objects
250	objOverlay = document.getElementById('overlay');
251	objLightbox = document.getElementById('lightbox');
252
253	// hide lightbox and overlay
254	objOverlay.style.display = 'none';
255	objLightbox.style.display = 'none';
256	
257	// disable keypress listener
258	document.onkeypress = '';
259}
260
261
262
263
264//
265// initLightbox()
266// Function runs on window load, going through link tags looking for rel="lightbox".
267// These links receive onclick events that enable the lightbox display for their targets.
268// The function also inserts html markup at the top of the page which will be used as a
269// container for the overlay pattern and the inline image.
270//
271function initLightbox()
272{
273	
274	if (!document.getElementsByTagName){ return; }
275	var anchors = document.getElementsByTagName("a");
276
277	// loop through all anchor tags
278	for (var i=0; i<anchors.length; i++){
279		var anchor = anchors[i];
280
281		if (anchor.getAttribute("href") && (anchor.getAttribute("rel") == "lightbox")){
282			anchor.onclick = function () {showLightbox(this); return false;}
283		}
284	}
285
286	// the rest of this code inserts html at the top of the page that looks like this:
287	//
288	// <div id="overlay">
289	//		<a href="#" onclick="hideLightbox(); return false;"><img id="loadingImage" /></a>
290	//	</div>
291	// <div id="lightbox">
292	//		<a href="#" onclick="hideLightbox(); return false;" title="Click anywhere to close image">
293	//			<img id="closeButton" />		
294	//			<img id="lightboxImage" />
295	//		</a>
296	//		<div id="lightboxDetails">
297	//			<div id="lightboxCaption"></div>
298	//			<div id="keyboardMsg"></div>
299	//		</div>
300	// </div>
301	
302	var objBody = document.getElementsByTagName("body").item(0);
303	
304	// create overlay div and hardcode some functional styles (aesthetic styles are in CSS file)
305	var objOverlay = document.createElement("div");
306	objOverlay.setAttribute('id','overlay');
307	objOverlay.onclick = function () {hideLightbox(); return false;}
308	objOverlay.style.display = 'none';
309	objOverlay.style.position = 'absolute';
310	objOverlay.style.top = '0';
311	objOverlay.style.left = '0';
312	objOverlay.style.zIndex = '90';
313 	objOverlay.style.width = '100%';
314	objBody.insertBefore(objOverlay, objBody.firstChild);
315	
316	var arrayPageSize = getPageSize();
317	var arrayPageScroll = getPageScroll();
318
319	// preload and create loader image
320	var imgPreloader = new Image();
321	
322	// if loader image found, create link to hide lightbox and create loadingimage
323	imgPreloader.onload=function(){
324
325		var objLoadingImageLink = document.createElement("a");
326		objLoadingImageLink.setAttribute('href','#');
327		objLoadingImageLink.onclick = function () {hideLightbox(); return false;}
328		objOverlay.appendChild(objLoadingImageLink);
329		
330		var objLoadingImage = document.createElement("img");
331		objLoadingImage.src = loadingImage;
332		objLoadingImage.setAttribute('id','loadingImage');
333		objLoadingImage.style.position = 'absolute';
334		objLoadingImage.style.zIndex = '150';
335		objLoadingImageLink.appendChild(objLoadingImage);
336
337		imgPreloader.onload=function(){};	//	clear onLoad, as IE will flip out w/animated gifs
338
339		return false;
340	}
341
342	imgPreloader.src = loadingImage;
343
344	// create lightbox div, same note about styles as above
345	var objLightbox = document.createElement("div");
346	objLightbox.setAttribute('id','lightbox');
347	objLightbox.style.display = 'none';
348	objLightbox.style.position = 'absolute';
349	objLightbox.style.zIndex = '100';	
350	objBody.insertBefore(objLightbox, objOverlay.nextSibling);
351	
352	// create link
353	var objLink = document.createElement("a");
354	objLink.setAttribute('href','#');
355	objLink.setAttribute('title','Click to close');
356	objLink.onclick = function () {hideLightbox(); return false;}
357	objLightbox.appendChild(objLink);
358
359	// preload and create close button image
360	var imgPreloadCloseButton = new Image();
361
362	// if close button image found, 
363	imgPreloadCloseButton.onload=function(){
364
365		var objCloseButton = document.createElement("img");
366		objCloseButton.src = closeButton;
367		objCloseButton.setAttribute('id','closeButton');
368		objCloseButton.style.position = 'absolute';
369		objCloseButton.style.zIndex = '200';
370		objLink.appendChild(objCloseButton);
371
372		return false;

373	}
374
375	imgPreloadCloseButton.src = closeButton;
376
377	// create image
378	var objImage = document.createElement("img");
379	objImage.setAttribute('id','lightboxImage');
380	objLink.appendChild(objImage);
381	
382	// create details div, a container for the caption and keyboard message
383	var objLightboxDetails = document.createElement("div");
384	objLightboxDetails.setAttribute('id','lightboxDetails');
385	objLightbox.appendChild(objLightboxDetails);
386
387	// create caption
388	var objCaption = document.createElement("div");
389	objCaption.setAttribute('id','lightboxCaption');
390	objCaption.style.display = 'none';
391	objLightboxDetails.appendChild(objCaption);
392
393	// create keyboard message
394	var objKeyboardMsg = document.createElement("div");
395	objKeyboardMsg.setAttribute('id','keyboardMsg');
396	objKeyboardMsg.innerHTML = 'press <kbd>X</kbd> to close';
397	objLightboxDetails.appendChild(objKeyboardMsg);
398
399
400}
401
402
403
404
405//
406// addLoadEvent()
407// Adds event to window.onload without overwriting currently assigned onload functions.
408// Function found at Simon Willison's weblog - http://simon.incutio.com/
409//
410function addLoadEvent(func)
411{	
412	var oldonload = window.onload;
413	if (typeof window.onload != 'function'){
414    	window.onload = func;
415	} else {
416		window.onload = function(){
417		oldonload();
418		func();
419		}
420	}
421
422}
423
424
425
426addLoadEvent(initLightbox);	// run initLightbox onLoad