jquery.lightbox.js
上传用户:stephen_wu
上传日期:2008-07-05
资源大小:1757k
文件大小:14k
- /**
- * jQuery Lightbox
- * Version 0.5 - 11/29/2007
- * @author Warren Krewenki
- * @url http://code.google.com/p/jquery-lightbox/
- * @license New BSD (http://www.opensource.org/licenses/bsd-license.php)
- *
- * 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"><span id="lightboxloadingspindle"> </span></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 + '"><span id="lightboxcloseimg"> </span></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, 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 = {
- overlayOpacity : 0.8,
- borderSize : 10,
- imageArray : new Array,
- activeImage : null,
- inprogress : false,
- resizeSpeed : 350,
- widthCurrent: 250,
- heightCurrent: 250,
- xScale : 1,
- yScale : 1,
- displayTitle: false,
- navbarOnTop: false,
- slideNavBar: true, // slide nav bar up/down between image resizing transitions
- navBarSlideSpeed: 350,
- displayHelp: true,
- strings : {
- help: ' u2190 / P - previous imageu00a0u00a0u00a0u00a0u2192 / N - next imageu00a0u00a0u00a0u00a0ESC / 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);