447 lines
15 KiB
JavaScript
447 lines
15 KiB
JavaScript
/**
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* jQuery Lightbox
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* Version 0.5 - 11/29/2007
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* @author Warren Krewenki
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*
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* This package is distributed under the BSD license.
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* For full license information, see LICENSE.TXT
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*
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* Based on Lightbox 2 by Lokesh Dhakar (http://www.huddletogether.com/projects/lightbox2/)
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* Originally written to make use of the Prototype framework, and Script.acalo.us, now altered to use jQuery.
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*
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*
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**/
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(function($){
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$.fn.lightbox = function(options){
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// build main options
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var opts = $.extend({}, $.fn.lightbox.defaults, options);
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return this.each(function(){
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$(this).click(function(){
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// initalize the lightbox
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initialize();
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start(this);
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return false;
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});
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});
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/**
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* initalize()
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*
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* @return void
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* @author Warren Krewenki
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*/
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function initialize() {
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$('#overlay').remove();
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$('#lightbox').remove();
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opts.inprogress = false;
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// if jsonData, build the imageArray from data provided in JSON format
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if(opts.jsonData && opts.jsonData.length > 0) {
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var parser = opts.jsonDataParser ? opts.jsonDataParser : $.fn.lightbox.parseJsonData;
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opts.imageArray = [];
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opts.imageArray = parser(opts.jsonData);
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}
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var outerImage = '<div id="outerImageContainer"><div id="imageContainer"><iframe id="lightboxIframe" /><img id="lightboxImage"><div id="hoverNav"><a href="javascript://" title="' + opts.strings.prevLinkTitle + '" id="prevLink"></a><a href="javascript://" id="nextLink" title="' + opts.strings.nextLinkTitle + '"></a></div><div id="loading"><a href="javascript://" id="loadingLink"><img src="'+opts.fileLoadingImage+'"></a></div></div></div>';
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var imageData = '<div id="imageDataContainer" class="clearfix"><div id="imageData"><div id="imageDetails"><span id="caption"></span><span id="numberDisplay"></span></div><div id="bottomNav">';
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if (opts.displayHelp)
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imageData += '<span id="helpDisplay">' + opts.strings.help + '</span>';
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imageData += '<a href="javascript://" id="bottomNavClose" title="' + opts.strings.closeTitle + '"><img src="'+opts.fileBottomNavCloseImage+'"></a></div></div></div>';
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var string;
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if (opts.navbarOnTop) {
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string = '<div id="overlay"></div><div id="lightbox">' + imageData + outerImage + '</div>';
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$("body").append(string);
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$("#imageDataContainer").addClass('ontop');
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} else {
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string = '<div id="overlay"></div><div id="lightbox">' + outerImage + imageData + '</div>';
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$("body").append(string);
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}
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$("#overlay").click(function(){ end(); }).hide();
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$("#lightbox").click(function(){ end();}).hide();
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$("#loadingLink").click(function(){ end(); return false;});
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$("#bottomNavClose").click(function(){ end(); return false; });
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$('#outerImageContainer').width(opts.widthCurrent).height(opts.heightCurrent);
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$('#imageDataContainer').width(opts.widthCurrent);
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if (!opts.imageClickClose) {
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$("#lightboxImage").click(function(){ return false; });
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$("#hoverNav").click(function(){ return false; });
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}
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};
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function getPageSize() {
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var jqueryPageSize = new Array($(document).width(),$(document).height(), $(window).width(), $(window).height());
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return jqueryPageSize;
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};
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function getPageScroll() {
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var xScroll, yScroll;
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if (self.pageYOffset) {
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yScroll = self.pageYOffset;
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xScroll = self.pageXOffset;
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} else if (document.documentElement && document.documentElement.scrollTop){ // Explorer 6 Strict
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yScroll = document.documentElement.scrollTop;
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xScroll = document.documentElement.scrollLeft;
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} else if (document.body) {// all other Explorers
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yScroll = document.body.scrollTop;
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xScroll = document.body.scrollLeft;
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}
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var arrayPageScroll = new Array(xScroll,yScroll);
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return arrayPageScroll;
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};
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function pause(ms) {
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var date = new Date();
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var curDate = null;
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do{curDate = new Date();}
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while(curDate - date < ms);
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};
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function start(imageLink) {
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$("select, embed, object").hide();
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var arrayPageSize = getPageSize();
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$("#overlay").hide().css({width: '100%', height: arrayPageSize[1]+'px', opacity : opts.overlayOpacity}).fadeIn();
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imageNum = 0;
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// if data is not provided by jsonData parameter
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if(!opts.jsonData) {
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opts.imageArray = [];
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// if image is NOT part of a set..
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if(!imageLink.rel || (imageLink.rel == '')){
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// add single image to Lightbox.imageArray
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opts.imageArray.push(new Array(imageLink.href, opts.displayTitle ? imageLink.title : ''));
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} else {
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// if image is part of a set..
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$("a").each(function(){
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if(this.href && (this.rel == imageLink.rel)){
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opts.imageArray.push(new Array(this.href, opts.displayTitle ? this.title : ''));
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}
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});
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}
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}
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if(opts.imageArray.length > 1) {
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for(i = 0; i < opts.imageArray.length; i++){
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for(j = opts.imageArray.length-1; j>i; j--){
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if(opts.imageArray[i][0] == opts.imageArray[j][0]){
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opts.imageArray.splice(j,1);
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}
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}
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}
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while(opts.imageArray[imageNum][0] != imageLink.href) { imageNum++;}
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}
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// calculate top and left offset for the lightbox
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var arrayPageScroll = getPageScroll();
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var lightboxTop = arrayPageScroll[1] + (arrayPageSize[3] / 10);
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var lightboxLeft = arrayPageScroll[0];
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$('#lightbox').css({top: lightboxTop+'px', left: lightboxLeft+'px'}).show();
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if (!opts.slideNavBar)
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$('#imageData').hide();
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changeImage(imageNum);
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};
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function changeImage(imageNum) {
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if(opts.inprogress == false){
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opts.inprogress = true;
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opts.activeImage = imageNum; // update global var
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// hide elements during transition
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$('#loading').show();
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$('#lightboxImage').hide();
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$('#hoverNav').hide();
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$('#prevLink').hide();
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$('#nextLink').hide();
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if (opts.slideNavBar) { // delay preloading image until navbar will slide up
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// $('#imageDataContainer').slideUp(opts.navBarSlideSpeed, $.fn.doChangeImage);
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$('#imageDataContainer').hide();
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$('#imageData').hide();
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doChangeImage();
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} else {
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doChangeImage();
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}
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}
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};
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function doChangeImage() {
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imgPreloader = new Image();
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// once image is preloaded, resize image container
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imgPreloader.onload=function(){
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var newWidth = imgPreloader.width;
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var newHeight = imgPreloader.height;
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if (opts.fitToScreen) {
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var arrayPageSize = getPageSize();
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var ratio;
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var initialPageWidth = arrayPageSize[2] - 2 * opts.borderSize;
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var initialPageHeight = arrayPageSize[3] - 200;
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if (imgPreloader.height > initialPageHeight)
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{
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newWidth = parseInt((initialPageHeight/imgPreloader.height) * imgPreloader.width);
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newHeight = initialPageHeight;
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}
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else if (imgPreloader.width > initialPageWidth)
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{
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newHeight = parseInt((initialPageWidth/imgPreloader.width) * imgPreloader.height);
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newWidth = initialPageWidth;
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}
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}
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$('#lightboxImage').attr('src', opts.imageArray[opts.activeImage][0])
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.width(newWidth).height(newHeight);
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resizeImageContainer(newWidth, newHeight);
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};
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imgPreloader.src = opts.imageArray[opts.activeImage][0];
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};
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function end() {
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disableKeyboardNav();
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$('#lightbox').hide();
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$('#overlay').fadeOut();
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$('select, object, embed').show();
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};
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function preloadNeighborImages(){
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if(opts.loopImages && opts.imageArray.length > 1) {
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preloadNextImage = new Image();
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preloadNextImage.src = opts.imageArray[(opts.activeImage == (opts.imageArray.length - 1)) ? 0 : opts.activeImage + 1][0]
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preloadPrevImage = new Image();
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preloadPrevImage.src = opts.imageArray[(opts.activeImage == 0) ? (opts.imageArray.length - 1) : opts.activeImage - 1][0]
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} else {
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if((opts.imageArray.length - 1) > opts.activeImage){
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preloadNextImage = new Image();
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preloadNextImage.src = opts.imageArray[opts.activeImage + 1][0];
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}
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if(opts.activeImage > 0){
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preloadPrevImage = new Image();
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preloadPrevImage.src = opts.imageArray[opts.activeImage - 1][0];
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}
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}
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};
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function resizeImageContainer(imgWidth, imgHeight) {
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// get current width and height
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opts.widthCurrent = $("#outerImageContainer").outerWidth();
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opts.heightCurrent = $("#outerImageContainer").outerHeight();
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// get new width and height
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var widthNew = Math.max(350, imgWidth + (opts.borderSize * 2));
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var heightNew = (imgHeight + (opts.borderSize * 2));
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// scalars based on change from old to new
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opts.xScale = ( widthNew / opts.widthCurrent) * 100;
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opts.yScale = ( heightNew / opts.heightCurrent) * 100;
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// calculate size difference between new and old image, and resize if necessary
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wDiff = opts.widthCurrent - widthNew;
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hDiff = opts.heightCurrent - heightNew;
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$('#imageDataContainer').animate({width: widthNew},opts.resizeSpeed,'linear');
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$('#outerImageContainer').animate({width: widthNew},opts.resizeSpeed,'linear',function(){
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$('#outerImageContainer').animate({height: heightNew},opts.resizeSpeed,'linear',function(){
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showImage();
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});
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});
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// if new and old image are same size and no scaling transition is necessary,
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// do a quick pause to prevent image flicker.
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if((hDiff == 0) && (wDiff == 0)){
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if (jQuery.browser.msie){ pause(250); } else { pause(100);}
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}
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$('#prevLink').height(imgHeight);
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$('#nextLink').height(imgHeight);
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};
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function showImage() {
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$('#loading').hide();
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$('#lightboxImage').fadeIn("fast");
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updateDetails();
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preloadNeighborImages();
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opts.inprogress = false;
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};
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function updateDetails() {
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$('#numberDisplay').html('');
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if(opts.imageArray[opts.activeImage][1]){
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$('#caption').html(opts.imageArray[opts.activeImage][1]).show();
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}
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// if image is part of set display 'Image x of x'
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if(opts.imageArray.length > 1){
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var nav_html;
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nav_html = opts.strings.image + (opts.activeImage + 1) + opts.strings.of + opts.imageArray.length;
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if (!opts.disableNavbarLinks) {
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// display previous / next text links
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if ((opts.activeImage) > 0 || opts.loopImages) {
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nav_html = '<a title="' + opts.strings.prevLinkTitle + '" href="#" id="prevLinkText">' + opts.strings.prevLinkText + "</a>" + nav_html;
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}
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if (((opts.activeImage + 1) < opts.imageArray.length) || opts.loopImages) {
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nav_html += '<a title="' + opts.strings.nextLinkTitle + '" href="#" id="nextLinkText">' + opts.strings.nextLinkText + "</a>";
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}
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}
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$('#numberDisplay').html(nav_html).show();
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}
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if (opts.slideNavBar) {
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$("#imageData").slideDown(opts.navBarSlideSpeed);
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} else {
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$("#imageData").show();
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}
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var arrayPageSize = getPageSize();
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$('#overlay').height(arrayPageSize[1]);
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updateNav();
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};
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function updateNav() {
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if(opts.imageArray.length > 1){
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$('#hoverNav').show();
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// if loopImages is true, always show next and prev image buttons
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if(opts.loopImages) {
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$('#prevLink,#prevLinkText').show().click(function(){
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changeImage((opts.activeImage == 0) ? (opts.imageArray.length - 1) : opts.activeImage - 1); return false;
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});
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$('#nextLink,#nextLinkText').show().click(function(){
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changeImage((opts.activeImage == (opts.imageArray.length - 1)) ? 0 : opts.activeImage + 1); return false;
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});
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} else {
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// if not first image in set, display prev image button
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if(opts.activeImage != 0){
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$('#prevLink,#prevLinkText').show().click(function(){
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changeImage(opts.activeImage - 1); return false;
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});
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}
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// if not last image in set, display next image button
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if(opts.activeImage != (opts.imageArray.length - 1)){
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$('#nextLink,#nextLinkText').show().click(function(){
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changeImage(opts.activeImage +1); return false;
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});
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}
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}
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enableKeyboardNav();
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}
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};
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function keyboardAction(e) {
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var o = e.data.opts
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var keycode = e.keyCode;
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var escapeKey = 27;
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var key = String.fromCharCode(keycode).toLowerCase();
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if((key == 'x') || (key == 'o') || (key == 'c') || (keycode == escapeKey)){ // close lightbox
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end();
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} else if((key == 'p') || (keycode == 37)){ // display previous image
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if(o.loopImages) {
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disableKeyboardNav();
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changeImage((o.activeImage == 0) ? (o.imageArray.length - 1) : o.activeImage - 1);
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}
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else if(o.activeImage != 0){
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disableKeyboardNav();
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changeImage(o.activeImage - 1);
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}
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} else if((key == 'n') || (keycode == 39)){ // display next image
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if (opts.loopImages) {
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disableKeyboardNav();
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changeImage((o.activeImage == (o.imageArray.length - 1)) ? 0 : o.activeImage + 1);
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}
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else if(o.activeImage != (o.imageArray.length - 1)){
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disableKeyboardNav();
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changeImage(o.activeImage + 1);
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}
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}
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};
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function enableKeyboardNav() {
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$(document).bind('keydown', {opts: opts}, keyboardAction);
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};
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function disableKeyboardNav() {
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$(document).unbind('keydown');
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};
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};
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$.fn.lightbox.parseJsonData = function(data) {
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var imageArray = [];
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$.each(data, function(){
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imageArray.push(new Array(this.url, this.title));
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});
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return imageArray;
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};
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$.fn.lightbox.defaults = {
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fileLoadingImage : 'images/loading.gif',
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fileBottomNavCloseImage : 'images/closelabel.gif',
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overlayOpacity : 0.8,
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borderSize : 10,
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imageArray : new Array,
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activeImage : null,
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inprogress : false,
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resizeSpeed : 350,
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widthCurrent: 250,
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heightCurrent: 250,
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xScale : 1,
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yScale : 1,
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displayTitle: true,
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navbarOnTop: false,
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slideNavBar: false, // slide nav bar up/down between image resizing transitions
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navBarSlideSpeed: 350,
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displayHelp: false,
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strings : {
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help: ' \u2190 / P - previous image\u00a0\u00a0\u00a0\u00a0\u2192 / N - next image\u00a0\u00a0\u00a0\u00a0ESC / X - close image gallery',
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prevLinkTitle: 'previous image',
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nextLinkTitle: 'next image',
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prevLinkText: '« Previous',
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nextLinkText: 'Next »',
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closeTitle: 'close image gallery',
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image: 'Image ',
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of: ' of '
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},
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fitToScreen: false, // resize images if they are bigger than window
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disableNavbarLinks: false,
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loopImages: false,
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imageClickClose: true,
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jsonData: null,
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jsonDataParser: null
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};
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})(jQuery);
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