/*
Lightbox JS: Fullsize Image Overlays
by Lokesh Dhakar-http://www.huddletogether.com
For more information on this script, visit:
http://huddletogether.com/projects/lightbox/
Script featured on Dynamic Drive code library Jan 24th, 06':
http://www.dynamicdrive.com
Licensed under the Creative Commons Attribution 2.5 License-http://creativecommons.org/licenses/by/2.5/
(basically, do anything you want, just leave my name and link)
Table of Contents
-----------------
Configuration
Functions
-getPageScroll()
-getPageSize()
-pause()
-getKey()
-listenKey()
-showLightbox()
-hideLightbox()
-initLightbox()
-addLoadEvent()
Function Calls
-addLoadEvent(initLightbox)
*/
var loadingImage = 'images/lightbox/loading.gif';
var closeButton = 'images/lightbox/close.gif';
function getPageScroll(){
var yScroll;
if (self.pageYOffset) {
yScroll = self.pageYOffset;
} else if (document.documentElement && document.documentElement.scrollTop){	 // Explorer 6 Strict
yScroll = document.documentElement.scrollTop;
} else if (document.body) {// all other Explorers
yScroll = document.body.scrollTop;
}
arrayPageScroll = new Array('',yScroll)
return arrayPageScroll;
}
function getPageSize(){
var xScroll, yScroll;
if (window.innerHeight && window.scrollMaxY) {
xScroll = document.body.scrollWidth;
yScroll = window.innerHeight+window.scrollMaxY;
} else if (document.body.scrollHeight > document.body.offsetHeight){ // all but Explorer Mac
xScroll = document.body.scrollWidth;
yScroll = document.body.scrollHeight;
} else { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari
xScroll = document.body.offsetWidth;
yScroll = document.body.offsetHeight;
}
var windowWidth, windowHeight;
if (self.innerHeight) {	// all except Explorer
windowWidth = self.innerWidth;
windowHeight = self.innerHeight;
} else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict Mode
windowWidth = document.documentElement.clientWidth;
windowHeight = document.documentElement.clientHeight;
} else if (document.body) { // other Explorers
windowWidth = document.body.clientWidth;
windowHeight = document.body.clientHeight;
}
if(yScroll < windowHeight){
pageHeight = windowHeight;
} else {
pageHeight = yScroll;
}
if(xScroll < windowWidth){
pageWidth = windowWidth;
} else {
pageWidth = xScroll;
}
arrayPageSize = new Array(pageWidth,pageHeight,windowWidth,windowHeight)
return arrayPageSize;
}
function pause(numberMillis) {
var now = new Date();
var exitTime = now.getTime()+numberMillis;
while (true) {
now = new Date();
if (now.getTime() > exitTime)
return;
}
}
function getKey(e){
if (e == null) { // ie
keycode = event.keyCode;
} else { // mozilla
keycode = e.which;
}
key = String.fromCharCode(keycode).toLowerCase();
if(key == 'x'){ hideLightbox(); }
}
function listenKey () {	document.onkeypress = getKey; }
function showLightbox(objLink)
{
var objOverlay = document.getElementById('overlay');
var objLightbox = document.getElementById('lightbox');
var objCaption = document.getElementById('lightboxCaption');
var objImage = document.getElementById('lightboxImage');
var objLoadingImage = document.getElementById('loadingImage');
var objLightboxDetails = document.getElementById('lightboxDetails');
var arrayPageSize = getPageSize();
var arrayPageScroll = getPageScroll();
if (objLoadingImage) {
objLoadingImage.style.top = (arrayPageScroll[1]+((arrayPageSize[3]-35-objLoadingImage.height) / 2)+'px');
objLoadingImage.style.left = (((arrayPageSize[0]-20-objLoadingImage.width) / 2)+'px');
objLoadingImage.style.display = 'block';
}
objOverlay.style.height = (arrayPageScroll[1]+parseFloat(arrayPageSize[1])+'px');
objOverlay.style.display = 'block';
imgPreload = new Image();
imgPreload.onload=function(){
objImage.src = objLink.href;
var lightboxTop = arrayPageScroll[1]+((arrayPageSize[3]-35-imgPreload.height) / 2);
var lightboxLeft = ((arrayPageSize[0]-20-imgPreload.width) / 2);
objLightbox.style.top = (lightboxTop < 0) ? "0px" : lightboxTop+"px";
objLightbox.style.left = (lightboxLeft < 0) ? "0px" : lightboxLeft+"px";
objLightboxDetails.style.width = imgPreload.width+'px';
if(objLink.getAttribute('title')){
objCaption.style.display = 'block';
objCaption.innerHTML = objLink.getAttribute('title');
} else {
objCaption.style.display = 'none';
}
if (navigator.appVersion.indexOf("MSIE")!=-1){
pause(250);
}
if (objLoadingImage) {	objLoadingImage.style.display = 'none'; }
objLightbox.style.display = 'block';
arrayPageSize = getPageSize();
objOverlay.style.height = (arrayPageScroll[1]+parseFloat(arrayPageSize[1])+'px');
listenKey();
return false;
}
imgPreload.src = objLink.href;
}
function hideLightbox()
{
objOverlay = document.getElementById('overlay');
objLightbox = document.getElementById('lightbox');
objOverlay.style.display = 'none';
objLightbox.style.display = 'none';
document.onkeypress = '';
}
function initLightbox()
{
if (!document.getElementsByTagName){ return; }
var anchors = document.getElementsByTagName("a");
for (var i=0; i<anchors.length; i++){
var anchor = anchors[i];
if (anchor.getAttribute("href") && (anchor.getAttribute("rel") == "lightbox")){
anchor.onclick = function () {showLightbox(this); return false;}
}
}
var objBody = document.getElementsByTagName("body").item(0);
var objOverlay = document.createElement("div");
objOverlay.setAttribute('id','overlay');
objOverlay.onclick = function () {hideLightbox(); return false;}
objOverlay.style.display = 'none';
objOverlay.style.position = 'absolute';
objOverlay.style.top = '0';
objOverlay.style.left = '0';
objOverlay.style.zIndex = '90';
objOverlay.style.width = '100%';
objBody.insertBefore(objOverlay, objBody.firstChild);
var arrayPageSize = getPageSize();
var arrayPageScroll = getPageScroll();
var imgPreloader = new Image();
imgPreloader.onload=function(){
var objLoadingImageLink = document.createElement("a");
objLoadingImageLink.setAttribute('href','#');
objLoadingImageLink.onclick = function () {hideLightbox(); return false;}
objOverlay.appendChild(objLoadingImageLink);
var objLoadingImage = document.createElement("img");
objLoadingImage.src = loadingImage;
objLoadingImage.setAttribute('id','loadingImage');
objLoadingImage.style.position = 'absolute';
objLoadingImage.style.zIndex = '150';
objLoadingImageLink.appendChild(objLoadingImage);
imgPreloader.onload=function(){};	//	clear onLoad, as IE will flip out w/animated gifs
return false;
}
imgPreloader.src = loadingImage;
var objLightbox = document.createElement("div");
objLightbox.setAttribute('id','lightbox');
objLightbox.style.display = 'none';
objLightbox.style.position = 'absolute';
objLightbox.style.zIndex = '100';
objBody.insertBefore(objLightbox, objOverlay.nextSibling);
var objLink = document.createElement("a");
objLink.setAttribute('href','#');
objLink.setAttribute('title','Click to close');
objLink.onclick = function () {hideLightbox(); return false;}
objLightbox.appendChild(objLink);
var imgPreloadCloseButton = new Image();
imgPreloadCloseButton.onload=function(){
var objCloseButton = document.createElement("img");
objCloseButton.src = closeButton;
objCloseButton.setAttribute('id','closeButton');
objCloseButton.style.position = 'absolute';
objCloseButton.style.zIndex = '200';
objLink.appendChild(objCloseButton);
return false;
}
imgPreloadCloseButton.src = closeButton;
var objImage = document.createElement("img");
objImage.setAttribute('id','lightboxImage');
objLink.appendChild(objImage);
var objLightboxDetails = document.createElement("div");
objLightboxDetails.setAttribute('id','lightboxDetails');
objLightbox.appendChild(objLightboxDetails);
var objCaption = document.createElement("div");
objCaption.setAttribute('id','lightboxCaption');
objCaption.style.display = 'none';
objLightboxDetails.appendChild(objCaption);
var objKeyboardMsg = document.createElement("div");
objKeyboardMsg.setAttribute('id','keyboardMsg');
objKeyboardMsg.innerHTML = 'press <b>X</b> to close';
objLightboxDetails.appendChild(objKeyboardMsg);
}
function addLoadEvent(func)
{
var oldonload = window.onload;
if (typeof window.onload != 'function'){
window.onload = func;
} else {
window.onload = function(){
oldonload();
func();
}
}
}
addLoadEvent(initLightbox);	// run initLightbox onLoad