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/**
* jQuery Lightbox
* Version 0.5 - 11/29/2007
* @author Warren Krewenki
*
* Changes by:
* @author Krzysztof Kotowicz <koto at webworkers dot pl>:
* - bugfix: multiple instances of Lightbox galleries allowed
* (using opts variable instead of $.fn.lightbox.defaults)
* - bugfix: use var for local variables in a few functions
* - added support for navbarOnTop setting
* - added support for displayTitle setting
* - added support for slideNavBar setting (with slideNavBarSpeed)
* - added support for displayHelp setting
* - added support for fitToScreen setting (ported Lightbox VinDSL hack)
* (see http://www.huddletogether.com/forum/comments.php?DiscussionID=307)
* - plugin now uses jQuery.width() and jQuery.height()
* - removed eval() calls
* - removed destroyElement - uses jQuery.remove()
* - use of prevLinkText, nextLinkText and help
* - all strings are now placed in opts.strings to allow for customization/translation
*
* Based on Lightbox 2 by Lokesh Dhakar (http://www.huddletogether.com/projects/lightbox2/)
* Originally written to make use of the Prototype framework, and Script.acalo.us, now altered to use jQuery.
*
**/
(function($){
var opts;
$.fn.lightbox = function(options){
// build main options
opts = $.extend({}, $.fn.lightbox.defaults, options);
// initalize the lightbox
$.fn.lightbox.initialize();
return this.each(function(){
$(this).click(function(){
$(this).lightbox.start(this);
return false;
});
});
};
// lightbox functions
$.fn.lightbox.initialize = function(){
$('#overlay').remove();
$('#lightbox').remove();
opts.inprogress = false;
var outerImage = '<div id="outerImageContainer"><div id="imageContainer"><img id="lightboxImage"><div id="hoverNav"><a href="javascript://" title="' + opts.strings.prevLinkTitle + '" id="prevLink"></a><a href="javascript://" id="nextLink" title="' + opts.strings.nextLinkTitle + '"></a></div><div id="loading"><a href="javascript://" id="loadingLink"><img src="'+opts.fileLoadingImage+'"></a></div></div></div>';
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">'
if (opts.displayHelp)
imageData += '<span id="helpDisplay">' + opts.strings.help + '</span>';
imageData += '<a href="javascript://" id="bottomNavClose" title="' + opts.strings.closeTitle + '"><img src="'+opts.fileBottomNavCloseImage+'"></a></div></div></div>';
var string;
if (opts.navbarOnTop) {
string = '<div id="overlay"></div><div id="lightbox">' + imageData + outerImage + '</div>';
$("body").append(string);
$("#imageDataContainer").addClass('ontop');
} else {
string = '<div id="overlay"></div><div id="lightbox">' + outerImage + imageData + '</div>';
$("body").append(string);
}
$("#overlay").click(function(){ $.fn.lightbox.end(); }).hide();
$("#lightbox").click(function(){ $.fn.lightbox.end();}).hide();
$("#loadingLink").click(function(){ $.fn.lightbox.end(); return false;});
$("#bottomNavClose").click(function(){ $.fn.lightbox.end(); return false; });
$('#outerImageContainer').width(opts.widthCurrent).height(opts.heightCurrent);
$('#imageDataContainer').width(opts.widthCurrent);
};
$.fn.lightbox.getPageSize = function(){
var xScroll, yScroll;
if (window.innerHeight && window.scrollMaxY) {
xScroll = window.innerWidth + window.scrollMaxX;
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
if(document.documentElement.clientWidth){
windowWidth = document.documentElement.clientWidth;
} else {
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;
}
// for small pages with total height less then height of the viewport
if(yScroll < windowHeight){
pageHeight = windowHeight;
} else {
pageHeight = yScroll;
}
// for small pages with total width less then width of the viewport
if(xScroll < windowWidth){
pageWidth = xScroll;
} else {
pageWidth = windowWidth;
}
var arrayPageSize = new Array(pageWidth,pageHeight,windowWidth,windowHeight);
return arrayPageSize;
};
$.fn.lightbox.getPageScroll = function(){
var xScroll, yScroll;
if (self.pageYOffset) {
yScroll = self.pageYOffset;
xScroll = self.pageXOffset;
} else if (document.documentElement && document.documentElement.scrollTop){ // Explorer 6 Strict
yScroll = document.documentElement.scrollTop;
xScroll = document.documentElement.scrollLeft;
} else if (document.body) {// all other Explorers
yScroll = document.body.scrollTop;
xScroll = document.body.scrollLeft;
}
var arrayPageScroll = new Array(xScroll,yScroll);
return arrayPageScroll;
};
$.fn.lightbox.pause = function(ms){
var date = new Date();
var curDate = null;
do{curDate = new Date();}
while( curDate - date < ms);
};
$.fn.lightbox.start = function(imageLink){
$("select, embed, object").hide();
var arrayPageSize = $.fn.lightbox.getPageSize();
$("#overlay").hide().css({width: '100%', height: arrayPageSize[1]+'px', opacity : opts.overlayOpacity}).fadeIn();
opts.imageArray = [];
imageNum = 0;
var anchors = document.getElementsByTagName( imageLink.tagName);
// if image is NOT part of a set..
if(!imageLink.rel || (imageLink.rel == '')){
// add single image to Lightbox.imageArray
opts.imageArray.push(new Array(imageLink.href, opts.displayTitle ? imageLink.title : ''));
} else {
// if image is part of a set..
$("a").each(function(){
if(this.href && (this.rel == imageLink.rel)){
opts.imageArray.push(new Array(this.href, opts.displayTitle ? this.title : ''));
}
})
for(i = 0; i < opts.imageArray.length; i++){
for(j = opts.imageArray.length-1; j>i; j--){
if(opts.imageArray[i][0] == opts.imageArray[j][0]){
opts.imageArray.splice(j,1);
}
}
}
while(opts.imageArray[imageNum][0] != imageLink.href) { imageNum++;}
}
// calculate top and left offset for the lightbox
var arrayPageScroll = $.fn.lightbox.getPageScroll();
var lightboxTop = arrayPageScroll[1] + (arrayPageSize[3] / 10);
var lightboxLeft = arrayPageScroll[0];
$('#lightbox').css({top: lightboxTop+'px', left: lightboxLeft+'px'}).show();
if (!opts.slideNavBar)
$('#imageData').hide();
$.fn.lightbox.changeImage(imageNum);
};
$.fn.lightbox.changeImage = function(imageNum){
if(opts.inprogress == false){
opts.inprogress = true;
opts.activeImage = imageNum; // update global var
// hide elements during transition
$('#loading').show();
$('#lightboxImage').hide();
$('#hoverNav').hide();
$('#prevLink').hide();
$('#nextLink').hide();
if (opts.slideNavBar) { // delay preloading image until navbar will slide up
// $('#imageDataContainer').slideUp(opts.navBarSlideSpeed, $.fn.doChangeImage);
$('#imageDataContainer').hide();
$('#imageData').hide();
$.fn.doChangeImage();
} else {
$.fn.doChangeImage();
}
}
};
$.fn.doChangeImage = function(){
imgPreloader = new Image();
// once image is preloaded, resize image container
imgPreloader.onload=function(){
var newWidth = imgPreloader.width;
var newHeight = imgPreloader.height;
if (opts.fitToScreen) {
var arrayPageSize = $.fn.lightbox.getPageSize();
var ratio;
var initialPageWidth = arrayPageSize[2] - 2 * opts.borderSize;
var initialPageHeight = arrayPageSize[3] - 200;
if (imgPreloader.height > initialPageHeight)
{
newWidth = parseInt((initialPageHeight/imgPreloader.height) * imgPreloader.width);
newHeight = initialPageHeight;
}
else if (imgPreloader.width > initialPageWidth)
{
newHeight = parseInt((initialPageWidth/imgPreloader.width) * imgPreloader.height);
newWidth = initialPageWidth;
}
}
$('#lightboxImage').attr('src', opts.imageArray[opts.activeImage][0])
.width(newWidth).height(newHeight);
$.fn.lightbox.resizeImageContainer(newWidth, newHeight);
}
imgPreloader.src = opts.imageArray[opts.activeImage][0];
}
$.fn.lightbox.end = function(){
$.fn.lightbox.disableKeyboardNav();
$('#lightbox').hide();
$('#overlay').fadeOut();
$('select, object, embed').show();
};
$.fn.lightbox.preloadNeighborImages = function(){
if((opts.imageArray.length - 1) > opts.activeImage){
preloadNextImage = new Image();
preloadNextImage.src = opts.imageArray[opts.activeImage + 1][0];
}
if(opts.activeImage > 0){
preloadPrevImage = new Image();
preloadPrevImage.src = opts.imageArray[opts.activeImage - 1][0];
}
};
$.fn.lightbox.keyboardAction = function(e){
if (e == null) { // ie
var keycode = event.keyCode;
var escapeKey = 27;
} else { // mozilla
var keycode = e.keyCode;
var escapeKey = e.DOM_VK_ESCAPE;
}
var key = String.fromCharCode(keycode).toLowerCase();
if((key == 'x') || (key == 'o') || (key == 'c') || (keycode == escapeKey)){ // close lightbox
$.fn.lightbox.end();
} else if((key == 'p') || (keycode == 37)){ // display previous image
if(opts.activeImage != 0){
$.fn.lightbox.disableKeyboardNav();
$.fn.lightbox.changeImage(opts.activeImage - 1);
}
} else if((key == 'n') || (keycode == 39)){ // display next image
if(opts.activeImage != (opts.imageArray.length - 1)){
$.fn.lightbox.disableKeyboardNav();
$.fn.lightbox.changeImage(opts.activeImage + 1);
}
}
};
$.fn.lightbox.resizeImageContainer = function(imgWidth, imgHeight){
// get current width and height
opts.widthCurrent = document.getElementById('outerImageContainer').offsetWidth;
opts.heightCurrent = document.getElementById('outerImageContainer').offsetHeight;
// get new width and height
var widthNew = (imgWidth + (opts.borderSize * 2));
var heightNew = (imgHeight + (opts.borderSize * 2));
// scalars based on change from old to new
opts.xScale = ( widthNew / opts.widthCurrent) * 100;
opts.yScale = ( heightNew / opts.heightCurrent) * 100;
// calculate size difference between new and old image, and resize if necessary
wDiff = opts.widthCurrent - widthNew;
hDiff = opts.heightCurrent - heightNew;
$('#imageDataContainer').animate({width: widthNew},opts.resizeSpeed,'linear');
$('#outerImageContainer').animate({width: widthNew},opts.resizeSpeed,'linear',function(){
$('#outerImageContainer').animate({height: heightNew},opts.resizeSpeed,'linear',function(){
$.fn.lightbox.showImage();
});
});
// if new and old image are same size and no scaling transition is necessary,
// do a quick pause to prevent image flicker.
if((hDiff == 0) && (wDiff == 0)){
if (jQuery.browser.msie){ $.fn.lightbox.pause(250); } else { $.fn.lightbox.pause(100);}
}
$('#prevLink').height(imgHeight);
$('#nextLink').height(imgHeight);
};
$.fn.lightbox.showImage = function(){
$('#loading').hide();
$('#lightboxImage').fadeIn("fast");
$.fn.lightbox.updateDetails();
$.fn.lightbox.preloadNeighborImages();
opts.inprogress = false;
};
$.fn.lightbox.updateDetails = function(){
if(opts.imageArray[opts.activeImage][1]){
$('#caption').html(opts.imageArray[opts.activeImage][1]).show();
}
// if image is part of set display 'Image x of x'
if(opts.imageArray.length > 1){
var nav_html;
nav_html = opts.strings.image + (opts.activeImage + 1) + opts.strings.of + opts.imageArray.length;
// display previous / next text links
if ((opts.activeImage) > 0) {
nav_html = '<a title="' + opts.strings.prevLinkTitle + '" href="#" id="prevLinkText">' + opts.strings.prevLinkText + "</a>" + nav_html;
}
if ((opts.activeImage + 1) < opts.imageArray.length) {
nav_html += '<a title="' + opts.strings.nextLinkTitle + '" href="#" id="nextLinkText">' + opts.strings.nextLinkText + "</a>";
}
$('#numberDisplay').html(nav_html).show();
}
if (opts.slideNavBar) {
$("#imageData").slideDown(opts.navBarSlideSpeed);
} else {
$("#imageData").show();
}
var arrayPageSize = $.fn.lightbox.getPageSize();
$('#overlay').height(arrayPageSize[1]);
$.fn.lightbox.updateNav();
};
$.fn.lightbox.updateNav = function(){
$('#hoverNav').show();
// if not first image in set, display prev image button
if(opts.activeImage != 0){
$('#prevLink,#prevLinkText').show().click(function(){
$.fn.lightbox.changeImage(opts.activeImage - 1); return false;
});
}
// if not last image in set, display next image button
if(opts.activeImage != (opts.imageArray.length - 1)){
$('#nextLink,#nextLinkText').show().click(function(){
$.fn.lightbox.changeImage(opts.activeImage +1); return false;
});
}
$.fn.lightbox.enableKeyboardNav();
};
$.fn.lightbox.enableKeyboardNav = function(){
document.onkeydown = $.fn.lightbox.keyboardAction;
};
$.fn.lightbox.disableKeyboardNav = function(){
document.onkeydown = '';
};
$.fn.lightbox.defaults = {
fileLoadingImage : 'images/loading.gif',
fileBottomNavCloseImage : 'images/closelabel.gif',
overlayOpacity : 0.8,
borderSize : 10,
imageArray : new Array,
activeImage : null,
inprogress : false,
resizeSpeed : 350,
widthCurrent: 250,
heightCurrent: 250,
xScale : 1,
yScale : 1,
displayTitle: true,
navbarOnTop: false,
slideNavBar: false, // slide nav bar up/down between image resizing transitions
navBarSlideSpeed: 350,
displayHelp: false,
strings : {
help: ' \u2190 / P - previous image\u00a0\u00a0\u00a0\u00a0\u2192 / N - next image\u00a0\u00a0\u00a0\u00a0ESC / X - close image gallery',
prevLinkTitle: 'previous image',
nextLinkTitle: 'next image',
prevLinkText: '« Previous',
nextLinkText: 'Next »',
closeTitle: 'close image gallery',
image: 'Image ',
of: ' of '
},
fitToScreen: false // resize images if they are bigger than window
};
})(jQuery);
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