Team:University College London/js/lightbox

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/* Lightbox v2.51 by Lokesh Dhakar - http://www.lokeshdhakar.com

For more information, visit: http://lokeshdhakar.com/projects/lightbox2/

Licensed under the Creative Commons Attribution 2.5 License - http://creativecommons.org/licenses/by/2.5/ - free for use in both personal and commercial projects - attribution requires leaving author name, author link, and the license info intact

Thanks - Scott Upton(uptonic.com), Peter-Paul Koch(quirksmode.com), and Thomas Fuchs(mir.aculo.us) for ideas, libs, and snippets. - Artemy Tregubenko (arty.name) for cleanup and help in updating to latest proto-aculous in v2.05.

Table of Contents

=====

LightboxOptions

Lightbox - constructor - init - enable - build - start - changeImage - sizeContainer - showImage - updateNav - updateDetails - preloadNeigbhoringImages - enableKeyboardNav - disableKeyboardNav - keyboardAction - end

options = new LightboxOptions lightbox = new Lightbox options

/

(function() {

 var $, Lightbox, LightboxOptions;

 $ = jQuery;

 LightboxOptions = (function() {

   function LightboxOptions() {
     this.fileLoadingImage = 'images/loading.gif';
     this.fileCloseImage = 'images/close.png';
     this.resizeDuration = 700;
     this.fadeDuration = 500;
     this.labelImage = "Image";
     this.labelOf = "of";
   }

   return LightboxOptions;

 })();

 Lightbox = (function() {

   function Lightbox(options) {
     this.options = options;
     this.album = [];
     this.currentImageIndex = void 0;
     this.init();
   }

   Lightbox.prototype.init = function() {
     this.enable();
     return this.build();
   };

   Lightbox.prototype.enable = function() {
     var _this = this;
     return $('body').on('click', 'a[rel^=lightbox], area[rel^=lightbox]', function(e) {
       _this.start($(e.currentTarget));
       return false;
     });
   };

   Lightbox.prototype.build = function() {
     var $lightbox,
       _this = this;

$("

", {

       id: 'lightboxOverlay'
     }).after($('<div/>', {
       id: 'lightbox'
     }).append($('<div/>', {
       "class": 'lb-outerContainer'
     }).append($('<div/>', {
       "class": 'lb-container'
     }).append($('<img/>', {
       "class": 'lb-image'
     }), $('<div/>', {
       "class": 'lb-nav'
     }).append($('<a/>', {
       "class": 'lb-prev'
     }), $('<a/>', {
       "class": 'lb-next'
     })), $('<div/>', {
       "class": 'lb-loader'
     }).append($('<a/>', {
       "class": 'lb-cancel'
     }).append($('<img/>', {
       src: this.options.fileLoadingImage
     }))))), $('<div/>', {
       "class": 'lb-dataContainer'
     }).append($('<div/>', {
       "class": 'lb-data'
     }).append($('<div/>', {
       "class": 'lb-details'
     }).append($('<span/>', {
       "class": 'lb-caption'
     }), $('<span/>', {
       "class": 'lb-number'
     })), $('<div/>', {
       "class": 'lb-closeContainer'
     }).append($('<a/>', {
       "class": 'lb-close'
     }).append($('<img/>', {
       src: this.options.fileCloseImage
     }))))))).appendTo($('body'));
     $('#lightboxOverlay').hide().on('click', function(e) {
       _this.end();
       return false;
     });
     $lightbox = $('#lightbox');
     $lightbox.hide().on('click', function(e) {
       if ($(e.target).attr('id') === 'lightbox') _this.end();
       return false;
     });
     $lightbox.find('.lb-outerContainer').on('click', function(e) {
       if ($(e.target).attr('id') === 'lightbox') _this.end();
       return false;
     });
     $lightbox.find('.lb-prev').on('click', function(e) {
       _this.changeImage(_this.currentImageIndex - 1);
       return false;
     });
     $lightbox.find('.lb-next').on('click', function(e) {
       _this.changeImage(_this.currentImageIndex + 1);
       return false;
     });
     $lightbox.find('.lb-loader, .lb-close').on('click', function(e) {
       _this.end();
       return false;
     });
   };

   Lightbox.prototype.start = function($link) {
     var $lightbox, $window, a, i, imageNumber, left, top, _len, _ref;
     $(window).on("resize", this.sizeOverlay);
     $('select, object, embed').css({
       visibility: "hidden"
     });
     $('#lightboxOverlay').width($(document).width()).height($(document).height()).fadeIn(this.options.fadeDuration);
     this.album = [];
     imageNumber = 0;
     if ($link.attr('rel') === 'lightbox') {
       this.album.push({
         link: $link.attr('href'),
         title: $link.attr('title')
       });
     } else {
       _ref = $($link.prop("tagName") + '[rel="' + $link.attr('rel') + '"]');
       for (i = 0, _len = _ref.length; i < _len; i++) {
         a = _ref[i];
         this.album.push({
           link: $(a).attr('href'),
           title: $(a).attr('title')
         });
         if ($(a).attr('href') === $link.attr('href')) imageNumber = i;
       }
     }
     $window = $(window);
     top = $window.scrollTop() + $window.height() / 10;
     left = $window.scrollLeft();
     $lightbox = $('#lightbox');
     $lightbox.css({
       top: top + 'px',
       left: left + 'px'
     }).fadeIn(this.options.fadeDuration);
     this.changeImage(imageNumber);
   };

   Lightbox.prototype.changeImage = function(imageNumber) {
     var $image, $lightbox, preloader,
       _this = this;
     this.disableKeyboardNav();
     $lightbox = $('#lightbox');
     $image = $lightbox.find('.lb-image');
     this.sizeOverlay();
     $('#lightboxOverlay').fadeIn(this.options.fadeDuration);
     $('.loader').fadeIn('slow');
     $lightbox.find('.lb-image, .lb-nav, .lb-prev, .lb-next, .lb-dataContainer, .lb-numbers, .lb-caption').hide();
     $lightbox.find('.lb-outerContainer').addClass('animating');
     preloader = new Image;
     preloader.onload = function() {
       $image.attr('src', _this.album[imageNumber].link);
       $image.width = preloader.width;
       $image.height = preloader.height;
       return _this.sizeContainer(preloader.width, preloader.height);
     };
     preloader.src = this.album[imageNumber].link;
     this.currentImageIndex = imageNumber;
   };

   Lightbox.prototype.sizeOverlay = function() {
     return $('#lightboxOverlay').width($(document).width()).height($(document).height());
   };

   Lightbox.prototype.sizeContainer = function(imageWidth, imageHeight) {
     var $container, $lightbox, $outerContainer, containerBottomPadding, containerLeftPadding, containerRightPadding, containerTopPadding, newHeight, newWidth, oldHeight, oldWidth,
       _this = this;
     $lightbox = $('#lightbox');
     $outerContainer = $lightbox.find('.lb-outerContainer');
     oldWidth = $outerContainer.outerWidth();
     oldHeight = $outerContainer.outerHeight();
     $container = $lightbox.find('.lb-container');
     containerTopPadding = parseInt($container.css('padding-top'), 10);
     containerRightPadding = parseInt($container.css('padding-right'), 10);
     containerBottomPadding = parseInt($container.css('padding-bottom'), 10);
     containerLeftPadding = parseInt($container.css('padding-left'), 10);
     newWidth = imageWidth + containerLeftPadding + containerRightPadding;
     newHeight = imageHeight + containerTopPadding + containerBottomPadding;
     if (newWidth !== oldWidth && newHeight !== oldHeight) {
       $outerContainer.animate({
         width: newWidth,
         height: newHeight
       }, this.options.resizeDuration, 'swing');
     } else if (newWidth !== oldWidth) {
       $outerContainer.animate({
         width: newWidth
       }, this.options.resizeDuration, 'swing');
     } else if (newHeight !== oldHeight) {
       $outerContainer.animate({
         height: newHeight
       }, this.options.resizeDuration, 'swing');
     }
     setTimeout(function() {
       $lightbox.find('.lb-dataContainer').width(newWidth);
       $lightbox.find('.lb-prevLink').height(newHeight);
       $lightbox.find('.lb-nextLink').height(newHeight);
       _this.showImage();
     }, this.options.resizeDuration);
   };

   Lightbox.prototype.showImage = function() {
     var $lightbox;
     $lightbox = $('#lightbox');
     $lightbox.find('.lb-loader').hide();
     $lightbox.find('.lb-image').fadeIn('slow');
     this.updateNav();
     this.updateDetails();
     this.preloadNeighboringImages();
     this.enableKeyboardNav();
   };

   Lightbox.prototype.updateNav = function() {
     var $lightbox;
     $lightbox = $('#lightbox');
     $lightbox.find('.lb-nav').show();
     if (this.currentImageIndex > 0) $lightbox.find('.lb-prev').show();
     if (this.currentImageIndex < this.album.length - 1) {
       $lightbox.find('.lb-next').show();
     }
   };

   Lightbox.prototype.updateDetails = function() {
     var $lightbox,
       _this = this;
     $lightbox = $('#lightbox');
     if (typeof this.album[this.currentImageIndex].title !== 'undefined' && this.album[this.currentImageIndex].title !== "") {
       $lightbox.find('.lb-caption').html(this.album[this.currentImageIndex].title).fadeIn('fast');
     }
     if (this.album.length > 1) {
       $lightbox.find('.lb-number').html(this.options.labelImage + ' ' + (this.currentImageIndex + 1) + ' ' + this.options.labelOf + '  ' + this.album.length).fadeIn('fast');
     } else {
       $lightbox.find('.lb-number').hide();
     }
     $lightbox.find('.lb-outerContainer').removeClass('animating');
     $lightbox.find('.lb-dataContainer').fadeIn(this.resizeDuration, function() {
       return _this.sizeOverlay();
     });
   };

   Lightbox.prototype.preloadNeighboringImages = function() {
     var preloadNext, preloadPrev;
     if (this.album.length > this.currentImageIndex + 1) {
       preloadNext = new Image;
       preloadNext.src = this.album[this.currentImageIndex + 1].link;
     }
     if (this.currentImageIndex > 0) {
       preloadPrev = new Image;
       preloadPrev.src = this.album[this.currentImageIndex - 1].link;
     }
   };

   Lightbox.prototype.enableKeyboardNav = function() {
     $(document).on('keyup.keyboard', $.proxy(this.keyboardAction, this));
   };

   Lightbox.prototype.disableKeyboardNav = function() {
     $(document).off('.keyboard');
   };

   Lightbox.prototype.keyboardAction = function(event) {
     var KEYCODE_ESC, KEYCODE_LEFTARROW, KEYCODE_RIGHTARROW, key, keycode;
     KEYCODE_ESC = 27;
     KEYCODE_LEFTARROW = 37;
     KEYCODE_RIGHTARROW = 39;
     keycode = event.keyCode;
     key = String.fromCharCode(keycode).toLowerCase();
     if (keycode === KEYCODE_ESC || key.match(/x|o|c/)) {
       this.end();
     } else if (key === 'p' || keycode === KEYCODE_LEFTARROW) {
       if (this.currentImageIndex !== 0) {
         this.changeImage(this.currentImageIndex - 1);
       }
     } else if (key === 'n' || keycode === KEYCODE_RIGHTARROW) {
       if (this.currentImageIndex !== this.album.length - 1) {
         this.changeImage(this.currentImageIndex + 1);
       }
     }
   };

   Lightbox.prototype.end = function() {
     this.disableKeyboardNav();
     $(window).off("resize", this.sizeOverlay);
     $('#lightbox').fadeOut(this.options.fadeDuration);
     $('#lightboxOverlay').fadeOut(this.options.fadeDuration);
     return $('select, object, embed').css({
       visibility: "visible"
     });
   };

   return Lightbox;

 })();

 $(function() {
   var lightbox, options;
   options = new LightboxOptions;
   return lightbox = new Lightbox(options);
 });

}).call(this);