Template:Edinburgh UG/lightboxJS
/*!
* Lightbox v2.8.1 * by Lokesh Dhakar * * More info: * http://lokeshdhakar.com/projects/lightbox2/ * * Copyright 2007, 2015 Lokesh Dhakar * Released under the MIT license * https://github.com/lokesh/lightbox2/blob/master/LICENSE */
// Uses Node, AMD or browser globals to create a module. (function (root, factory) {
if (typeof define === 'function' && define.amd) {
// AMD. Register as an anonymous module.
define(['jquery'], factory);
} else if (typeof exports === 'object') {
// Node. Does not work with strict CommonJS, but
// only CommonJS-like environments that support module.exports,
// like Node.
module.exports = factory(require('jquery'));
} else {
// Browser globals (root is window)
root.lightbox = factory(root.jQuery);
}
}(this, function ($) {
function Lightbox(options) {
this.album = [];
this.currentImageIndex = void 0;
this.init();
// options
this.options = $.extend({}, this.constructor.defaults);
this.option(options);
}
// Descriptions of all options available on the demo site: // http://lokeshdhakar.com/projects/lightbox2/index.html#options Lightbox.defaults = { albumLabel: 'Image %1 of %2', alwaysShowNavOnTouchDevices: false, fadeDuration: 500, fitImagesInViewport: true, // maxWidth: 800, // maxHeight: 600, positionFromTop: 50, resizeDuration: 700, showImageNumberLabel: true, wrapAround: false };
Lightbox.prototype.option = function(options) {
$.extend(this.options, options);
};
Lightbox.prototype.imageCountLabel = function(currentImageNum, totalImages) {
return this.options.albumLabel.replace(/%1/g, currentImageNum).replace(/%2/g, totalImages);
};
Lightbox.prototype.init = function() {
this.enable();
this.build();
};
// Loop through anchors and areamaps looking for either data-lightbox attributes or rel attributes
// that contain 'lightbox'. When these are clicked, start lightbox.
Lightbox.prototype.enable = function() {
var self = this;
$('body').on('click', 'a[rel^=lightbox], area[rel^=lightbox], a[data-lightbox], area[data-lightbox]', function(event) {
self.start($(event.currentTarget));
return false;
});
};
// Build html for the lightbox and the overlay.
// Attach event handlers to the new DOM elements. click click click
Lightbox.prototype.build = function() {
var self = this;
$('<img class="lb-image" src="data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACH5BAEAAAAALAAAAAABAAEAAAICRAEAOw==" />
<a class="lb-prev" href="" ></a><a class="lb-next" href="" ></a>
<a class="lb-cancel"></a>
<a class="lb-close"></a>
// Cache jQuery objects
this.$lightbox = $('#lightbox');
this.$overlay = $('#lightboxOverlay');
this.$outerContainer = this.$lightbox.find('.lb-outerContainer');
this.$container = this.$lightbox.find('.lb-container');
// Store css values for future lookup
this.containerTopPadding = parseInt(this.$container.css('padding-top'), 10);
this.containerRightPadding = parseInt(this.$container.css('padding-right'), 10);
this.containerBottomPadding = parseInt(this.$container.css('padding-bottom'), 10);
this.containerLeftPadding = parseInt(this.$container.css('padding-left'), 10);
// Attach event handlers to the newly minted DOM elements
this.$overlay.hide().on('click', function() {
self.end();
return false;
});
this.$lightbox.hide().on('click', function(event) {
if ($(event.target).attr('id') === 'lightbox') {
self.end();
}
return false;
});
this.$outerContainer.on('click', function(event) {
if ($(event.target).attr('id') === 'lightbox') {
self.end();
}
return false;
});
this.$lightbox.find('.lb-prev').on('click', function() {
if (self.currentImageIndex === 0) {
self.changeImage(self.album.length - 1);
} else {
self.changeImage(self.currentImageIndex - 1);
}
return false;
});
this.$lightbox.find('.lb-next').on('click', function() {
if (self.currentImageIndex === self.album.length - 1) {
self.changeImage(0);
} else {
self.changeImage(self.currentImageIndex + 1);
}
return false;
});
this.$lightbox.find('.lb-loader, .lb-close').on('click', function() {
self.end();
return false;
});
};
// Show overlay and lightbox. If the image is part of a set, add siblings to album array.
Lightbox.prototype.start = function($link) {
var self = this;
var $window = $(window);
$window.on('resize', $.proxy(this.sizeOverlay, this));
$('select, object, embed').css({
visibility: 'hidden'
});
this.sizeOverlay();
this.album = []; var imageNumber = 0;
function addToAlbum($link) {
self.album.push({
link: $link.attr('href'),
title: $link.attr('data-title') || $link.attr('title')
});
}
// Support both data-lightbox attribute and rel attribute implementations
var dataLightboxValue = $link.attr('data-lightbox');
var $links;
if (dataLightboxValue) {
$links = $($link.prop('tagName') + '[data-lightbox="' + dataLightboxValue + '"]');
for (var i = 0; i < $links.length; i = ++i) {
addToAlbum($($links[i]));
if ($links[i] === $link[0]) {
imageNumber = i;
}
}
} else {
if ($link.attr('rel') === 'lightbox') {
// If image is not part of a set
addToAlbum($link);
} else {
// If image is part of a set
$links = $($link.prop('tagName') + '[rel="' + $link.attr('rel') + '"]');
for (var j = 0; j < $links.length; j = ++j) {
addToAlbum($($links[j]));
if ($links[j] === $link[0]) {
imageNumber = j;
}
}
}
}
// Position Lightbox
var top = $window.scrollTop() + this.options.positionFromTop;
var left = $window.scrollLeft();
this.$lightbox.css({
top: top + 'px',
left: left + 'px'
}).fadeIn(this.options.fadeDuration);
this.changeImage(imageNumber); };
// Hide most UI elements in preparation for the animated resizing of the lightbox.
Lightbox.prototype.changeImage = function(imageNumber) {
var self = this;
this.disableKeyboardNav();
var $image = this.$lightbox.find('.lb-image');
this.$overlay.fadeIn(this.options.fadeDuration);
$('.lb-loader').fadeIn('slow');
this.$lightbox.find('.lb-image, .lb-nav, .lb-prev, .lb-next, .lb-dataContainer, .lb-numbers, .lb-caption').hide();
this.$outerContainer.addClass('animating');
// When image to show is preloaded, we send the width and height to sizeContainer()
var preloader = new Image();
preloader.onload = function() {
var $preloader;
var imageHeight;
var imageWidth;
var maxImageHeight;
var maxImageWidth;
var windowHeight;
var windowWidth;
$image.attr('src', self.album[imageNumber].link);
$preloader = $(preloader);
$image.width(preloader.width);
$image.height(preloader.height);
if (self.options.fitImagesInViewport) {
// Fit image inside the viewport.
// Take into account the border around the image and an additional 10px gutter on each side.
windowWidth = $(window).width();
windowHeight = $(window).height();
maxImageWidth = windowWidth - self.containerLeftPadding - self.containerRightPadding - 20;
maxImageHeight = windowHeight - self.containerTopPadding - self.containerBottomPadding - 120;
// Check if image size is larger then maxWidth|maxHeight in settings
if (self.options.maxWidth && self.options.maxWidth < maxImageWidth) {
maxImageWidth = self.options.maxWidth;
}
if (self.options.maxHeight && self.options.maxHeight < maxImageWidth) {
maxImageHeight = self.options.maxHeight;
}
// Is there a fitting issue?
if ((preloader.width > maxImageWidth) || (preloader.height > maxImageHeight)) {
if ((preloader.width / maxImageWidth) > (preloader.height / maxImageHeight)) {
imageWidth = maxImageWidth;
imageHeight = parseInt(preloader.height / (preloader.width / imageWidth), 10);
$image.width(imageWidth);
$image.height(imageHeight);
} else {
imageHeight = maxImageHeight;
imageWidth = parseInt(preloader.width / (preloader.height / imageHeight), 10);
$image.width(imageWidth);
$image.height(imageHeight);
}
}
}
self.sizeContainer($image.width(), $image.height());
};
preloader.src = this.album[imageNumber].link; this.currentImageIndex = imageNumber; };
// Stretch overlay to fit the viewport
Lightbox.prototype.sizeOverlay = function() {
this.$overlay
.width($(window).width())
.height($(document).height());
};
// Animate the size of the lightbox to fit the image we are showing
Lightbox.prototype.sizeContainer = function(imageWidth, imageHeight) {
var self = this;
var oldWidth = this.$outerContainer.outerWidth(); var oldHeight = this.$outerContainer.outerHeight(); var newWidth = imageWidth + this.containerLeftPadding + this.containerRightPadding; var newHeight = imageHeight + this.containerTopPadding + this.containerBottomPadding;
function postResize() {
self.$lightbox.find('.lb-dataContainer').width(newWidth);
self.$lightbox.find('.lb-prevLink').height(newHeight);
self.$lightbox.find('.lb-nextLink').height(newHeight);
self.showImage();
}
if (oldWidth !== newWidth || oldHeight !== newHeight) {
this.$outerContainer.animate({
width: newWidth,
height: newHeight
}, this.options.resizeDuration, 'swing', function() {
postResize();
});
} else {
postResize();
}
};
// Display the image and its details and begin preload neighboring images.
Lightbox.prototype.showImage = function() {
this.$lightbox.find('.lb-loader').stop(true).hide();
this.$lightbox.find('.lb-image').fadeIn('slow');
this.updateNav(); this.updateDetails(); this.preloadNeighboringImages(); this.enableKeyboardNav(); };
// Display previous and next navigation if appropriate.
Lightbox.prototype.updateNav = function() {
// Check to see if the browser supports touch events. If so, we take the conservative approach
// and assume that mouse hover events are not supported and always show prev/next navigation
// arrows in image sets.
var alwaysShowNav = false;
try {
document.createEvent('TouchEvent');
alwaysShowNav = (this.options.alwaysShowNavOnTouchDevices) ? true : false;
} catch (e) {}
this.$lightbox.find('.lb-nav').show();
if (this.album.length > 1) {
if (this.options.wrapAround) {
if (alwaysShowNav) {
this.$lightbox.find('.lb-prev, .lb-next').css('opacity', '1');
}
this.$lightbox.find('.lb-prev, .lb-next').show();
} else {
if (this.currentImageIndex > 0) {
this.$lightbox.find('.lb-prev').show();
if (alwaysShowNav) {
this.$lightbox.find('.lb-prev').css('opacity', '1');
}
}
if (this.currentImageIndex < this.album.length - 1) {
this.$lightbox.find('.lb-next').show();
if (alwaysShowNav) {
this.$lightbox.find('.lb-next').css('opacity', '1');
}
}
}
}
};
// Display caption, image number, and closing button.
Lightbox.prototype.updateDetails = function() {
var self = this;
// Enable anchor clicks in the injected caption html. // Thanks Nate Wright for the fix. @https://github.com/NateWr if (typeof this.album[this.currentImageIndex].title !== 'undefined' && this.album[this.currentImageIndex].title !== ) { this.$lightbox.find('.lb-caption') .html(this.album[this.currentImageIndex].title) .fadeIn('fast') .find('a').on('click', function(event) { if ($(this).attr('target') !== undefined) { window.open($(this).attr('href'), $(this).attr('target')); } else { location.href = $(this).attr('href'); } }); }
if (this.album.length > 1 && this.options.showImageNumberLabel) {
var labelText = this.imageCountLabel(this.currentImageIndex + 1, this.album.length);
this.$lightbox.find('.lb-number').text(labelText).fadeIn('fast');
} else {
this.$lightbox.find('.lb-number').hide();
}
this.$outerContainer.removeClass('animating');
this.$lightbox.find('.lb-dataContainer').fadeIn(this.options.resizeDuration, function() {
return self.sizeOverlay();
});
};
// Preload previous and next images in set.
Lightbox.prototype.preloadNeighboringImages = function() {
if (this.album.length > this.currentImageIndex + 1) {
var preloadNext = new Image();
preloadNext.src = this.album[this.currentImageIndex + 1].link;
}
if (this.currentImageIndex > 0) {
var 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 = 27;
var KEYCODE_LEFTARROW = 37;
var KEYCODE_RIGHTARROW = 39;
var keycode = event.keyCode;
var 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 (this.options.wrapAround && this.album.length > 1) {
this.changeImage(this.album.length - 1);
}
} else if (key === 'n' || keycode === KEYCODE_RIGHTARROW) {
if (this.currentImageIndex !== this.album.length - 1) {
this.changeImage(this.currentImageIndex + 1);
} else if (this.options.wrapAround && this.album.length > 1) {
this.changeImage(0);
}
}
};
// Closing time. :-(
Lightbox.prototype.end = function() {
this.disableKeyboardNav();
$(window).off('resize', this.sizeOverlay);
this.$lightbox.fadeOut(this.options.fadeDuration);
this.$overlay.fadeOut(this.options.fadeDuration);
$('select, object, embed').css({
visibility: 'visible'
});
};
return new Lightbox();
}));
