572 lines
20 KiB
JavaScript
572 lines
20 KiB
JavaScript
/*!
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* Lightbox v2.11.4
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* by Lokesh Dhakar
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*
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* More info:
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* http://lokeshdhakar.com/projects/lightbox2/
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*
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* Copyright Lokesh Dhakar
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* Released under the MIT license
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* https://github.com/lokesh/lightbox2/blob/master/LICENSE
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*
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* @preserve
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*/
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// Uses Node, AMD or browser globals to create a module.
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(function (root, factory) {
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if (typeof define === 'function' && define.amd) {
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// AMD. Register as an anonymous module.
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define(['jquery'], factory);
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} else if (typeof exports === 'object') {
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// Node. Does not work with strict CommonJS, but
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// only CommonJS-like environments that support module.exports,
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// like Node.
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module.exports = factory(require('jquery'));
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} else {
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// Browser globals (root is window)
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root.lightbox = factory(root.jQuery);
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}
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}(this, function ($) {
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function Lightbox(options) {
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this.album = [];
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this.currentImageIndex = void 0;
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this.init();
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// options
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this.options = $.extend({}, this.constructor.defaults);
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this.option(options);
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}
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// Descriptions of all options available on the demo site:
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// http://lokeshdhakar.com/projects/lightbox2/index.html#options
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Lightbox.defaults = {
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albumLabel: 'Image %1 of %2',
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alwaysShowNavOnTouchDevices: false,
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fadeDuration: 600,
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fitImagesInViewport: true,
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imageFadeDuration: 600,
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// maxWidth: 800,
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// maxHeight: 600,
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positionFromTop: 50,
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resizeDuration: 700,
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showImageNumberLabel: true,
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wrapAround: false,
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disableScrolling: false,
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/*
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Sanitize Title
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If the caption data is trusted, for example you are hardcoding it in, then leave this to false.
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This will free you to add html tags, such as links, in the caption.
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If the caption data is user submitted or from some other untrusted source, then set this to true
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to prevent xss and other injection attacks.
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*/
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sanitizeTitle: false
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};
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Lightbox.prototype.option = function(options) {
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$.extend(this.options, options);
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};
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Lightbox.prototype.imageCountLabel = function(currentImageNum, totalImages) {
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return this.options.albumLabel.replace(/%1/g, currentImageNum).replace(/%2/g, totalImages);
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};
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Lightbox.prototype.init = function() {
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var self = this;
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// Both enable and build methods require the body tag to be in the DOM.
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$(document).ready(function() {
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self.enable();
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self.build();
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});
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};
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// Loop through anchors and areamaps looking for either data-lightbox attributes or rel attributes
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// that contain 'lightbox'. When these are clicked, start lightbox.
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Lightbox.prototype.enable = function() {
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var self = this;
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$('body').on('click', 'a[rel^=lightbox], area[rel^=lightbox], a[data-lightbox], area[data-lightbox]', function(event) {
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self.start($(event.currentTarget));
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return false;
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});
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};
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// Build html for the lightbox and the overlay.
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// Attach event handlers to the new DOM elements. click click click
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Lightbox.prototype.build = function() {
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if ($('#lightbox').length > 0) {
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return;
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}
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var self = this;
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// The two root notes generated, #lightboxOverlay and #lightbox are given
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// tabindex attrs so they are focusable. We attach our keyboard event
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// listeners to these two elements, and not the document. Clicking anywhere
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// while Lightbox is opened will keep the focus on or inside one of these
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// two elements.
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//
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// We do this so we can prevent propogation of the Esc keypress when
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// Lightbox is open. This prevents it from intefering with other components
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// on the page below.
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//
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// Github issue: https://github.com/lokesh/lightbox2/issues/663
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$('<div id="lightboxOverlay" tabindex="-1" class="lightboxOverlay"></div><div id="lightbox" tabindex="-1" class="lightbox"><div class="lb-outerContainer"><div class="lb-container"><img class="lb-image" src="data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACH5BAEAAAAALAAAAAABAAEAAAICRAEAOw==" alt=""/><div class="lb-nav"><a class="lb-prev" role="button" tabindex="0" aria-label="Previous image" href="" ></a><a class="lb-next" role="button" tabindex="0" aria-label="Next image" href="" ></a></div><div class="lb-loader"><a class="lb-cancel" role="button" tabindex="0"></a></div></div></div><div class="lb-dataContainer"><div class="lb-data"><div class="lb-details"><span class="lb-caption"></span><span class="lb-number"></span></div><div class="lb-closeContainer"><a class="lb-close" role="button" tabindex="0"></a></div></div></div></div>').appendTo($('body'));
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// Cache jQuery objects
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this.$lightbox = $('#lightbox');
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this.$overlay = $('#lightboxOverlay');
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this.$outerContainer = this.$lightbox.find('.lb-outerContainer');
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this.$container = this.$lightbox.find('.lb-container');
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this.$image = this.$lightbox.find('.lb-image');
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this.$nav = this.$lightbox.find('.lb-nav');
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// Store css values for future lookup
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this.containerPadding = {
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top: parseInt(this.$container.css('padding-top'), 10),
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right: parseInt(this.$container.css('padding-right'), 10),
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bottom: parseInt(this.$container.css('padding-bottom'), 10),
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left: parseInt(this.$container.css('padding-left'), 10)
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};
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this.imageBorderWidth = {
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top: parseInt(this.$image.css('border-top-width'), 10),
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right: parseInt(this.$image.css('border-right-width'), 10),
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bottom: parseInt(this.$image.css('border-bottom-width'), 10),
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left: parseInt(this.$image.css('border-left-width'), 10)
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};
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// Attach event handlers to the newly minted DOM elements
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this.$overlay.hide().on('click', function() {
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self.end();
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return false;
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});
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this.$lightbox.hide().on('click', function(event) {
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if ($(event.target).attr('id') === 'lightbox') {
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self.end();
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}
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});
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this.$outerContainer.on('click', function(event) {
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if ($(event.target).attr('id') === 'lightbox') {
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self.end();
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}
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return false;
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});
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this.$lightbox.find('.lb-prev').on('click', function() {
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if (self.currentImageIndex === 0) {
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self.changeImage(self.album.length - 1);
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} else {
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self.changeImage(self.currentImageIndex - 1);
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}
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return false;
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});
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this.$lightbox.find('.lb-next').on('click', function() {
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if (self.currentImageIndex === self.album.length - 1) {
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self.changeImage(0);
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} else {
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self.changeImage(self.currentImageIndex + 1);
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}
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return false;
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});
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/*
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Show context menu for image on right-click
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There is a div containing the navigation that spans the entire image and lives above of it. If
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you right-click, you are right clicking this div and not the image. This prevents users from
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saving the image or using other context menu actions with the image.
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To fix this, when we detect the right mouse button is pressed down, but not yet clicked, we
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set pointer-events to none on the nav div. This is so that the upcoming right-click event on
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the next mouseup will bubble down to the image. Once the right-click/contextmenu event occurs
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we set the pointer events back to auto for the nav div so it can capture hover and left-click
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events as usual.
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*/
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this.$nav.on('mousedown', function(event) {
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if (event.which === 3) {
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self.$nav.css('pointer-events', 'none');
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self.$lightbox.one('contextmenu', function() {
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setTimeout(function() {
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this.$nav.css('pointer-events', 'auto');
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}.bind(self), 0);
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});
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}
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});
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this.$lightbox.find('.lb-loader, .lb-close').on('click keyup', function(e) {
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// If mouse click OR 'enter' or 'space' keypress, close LB
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if (
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e.type === 'click' || (e.type === 'keyup' && (e.which === 13 || e.which === 32))) {
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self.end();
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return false;
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}
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});
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};
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// Show overlay and lightbox. If the image is part of a set, add siblings to album array.
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Lightbox.prototype.start = function($link) {
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var self = this;
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var $window = $(window);
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$window.on('resize', $.proxy(this.sizeOverlay, this));
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this.sizeOverlay();
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this.album = [];
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var imageNumber = 0;
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function addToAlbum($link) {
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self.album.push({
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alt: $link.attr('data-alt'),
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link: $link.attr('href'),
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title: $link.attr('data-title') || $link.attr('title')
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});
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}
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// Support both data-lightbox attribute and rel attribute implementations
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var dataLightboxValue = $link.attr('data-lightbox');
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var $links;
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if (dataLightboxValue) {
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$links = $($link.prop('tagName') + '[data-lightbox="' + dataLightboxValue + '"]');
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for (var i = 0; i < $links.length; i = ++i) {
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addToAlbum($($links[i]));
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if ($links[i] === $link[0]) {
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imageNumber = i;
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}
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}
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} else {
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if ($link.attr('rel') === 'lightbox') {
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// If image is not part of a set
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addToAlbum($link);
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} else {
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// If image is part of a set
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$links = $($link.prop('tagName') + '[rel="' + $link.attr('rel') + '"]');
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for (var j = 0; j < $links.length; j = ++j) {
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addToAlbum($($links[j]));
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if ($links[j] === $link[0]) {
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imageNumber = j;
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}
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}
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}
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}
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// Position Lightbox
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var top = $window.scrollTop() + this.options.positionFromTop;
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var left = $window.scrollLeft();
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this.$lightbox.css({
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top: top + 'px',
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left: left + 'px'
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}).fadeIn(this.options.fadeDuration);
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// Disable scrolling of the page while open
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if (this.options.disableScrolling) {
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$('body').addClass('lb-disable-scrolling');
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}
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this.changeImage(imageNumber);
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};
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// Hide most UI elements in preparation for the animated resizing of the lightbox.
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Lightbox.prototype.changeImage = function(imageNumber) {
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var self = this;
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var filename = this.album[imageNumber].link;
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var filetype = filename.split('.').slice(-1)[0];
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var $image = this.$lightbox.find('.lb-image');
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// Disable keyboard nav during transitions
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this.disableKeyboardNav();
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// Show loading state
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this.$overlay.fadeIn(this.options.fadeDuration);
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$('.lb-loader').fadeIn('slow');
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this.$lightbox.find('.lb-image, .lb-nav, .lb-prev, .lb-next, .lb-dataContainer, .lb-numbers, .lb-caption').hide();
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this.$outerContainer.addClass('animating');
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// When image to show is preloaded, we send the width and height to sizeContainer()
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var preloader = new Image();
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preloader.onload = function() {
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var $preloader;
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var imageHeight;
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var imageWidth;
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var maxImageHeight;
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var maxImageWidth;
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var windowHeight;
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var windowWidth;
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$image.attr({
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'alt': self.album[imageNumber].alt,
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'src': filename
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});
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$preloader = $(preloader);
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$image.width(preloader.width);
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$image.height(preloader.height);
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var aspectRatio = preloader.width / preloader.height;
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windowWidth = $(window).width();
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windowHeight = $(window).height();
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// Calculate the max image dimensions for the current viewport.
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// Take into account the border around the image and an additional 10px gutter on each side.
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maxImageWidth = windowWidth - self.containerPadding.left - self.containerPadding.right - self.imageBorderWidth.left - self.imageBorderWidth.right - 20;
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maxImageHeight = windowHeight - self.containerPadding.top - self.containerPadding.bottom - self.imageBorderWidth.top - self.imageBorderWidth.bottom - self.options.positionFromTop - 70;
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/*
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Since many SVGs have small intrinsic dimensions, but they support scaling
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up without quality loss because of their vector format, max out their
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size inside the viewport.
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*/
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if (filetype === 'svg') {
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if (aspectRatio >= 1) {
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imageWidth = maxImageWidth;
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imageHeight = parseInt(maxImageWidth / aspectRatio, 10);
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} else {
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imageWidth = parseInt(maxImageHeight / aspectRatio, 10);
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imageHeight = maxImageHeight;
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}
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$image.width(imageWidth);
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$image.height(imageHeight);
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} else {
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// Fit image inside the viewport.
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if (self.options.fitImagesInViewport) {
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// Check if image size is larger then maxWidth|maxHeight in settings
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if (self.options.maxWidth && self.options.maxWidth < maxImageWidth) {
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maxImageWidth = self.options.maxWidth;
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}
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if (self.options.maxHeight && self.options.maxHeight < maxImageHeight) {
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maxImageHeight = self.options.maxHeight;
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}
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} else {
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maxImageWidth = self.options.maxWidth || preloader.width || maxImageWidth;
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maxImageHeight = self.options.maxHeight || preloader.height || maxImageHeight;
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}
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// Is the current image's width or height is greater than the maxImageWidth or maxImageHeight
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// option than we need to size down while maintaining the aspect ratio.
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if ((preloader.width > maxImageWidth) || (preloader.height > maxImageHeight)) {
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if ((preloader.width / maxImageWidth) > (preloader.height / maxImageHeight)) {
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imageWidth = maxImageWidth;
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imageHeight = parseInt(preloader.height / (preloader.width / imageWidth), 10);
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$image.width(imageWidth);
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$image.height(imageHeight);
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} else {
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imageHeight = maxImageHeight;
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imageWidth = parseInt(preloader.width / (preloader.height / imageHeight), 10);
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$image.width(imageWidth);
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$image.height(imageHeight);
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}
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}
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}
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self.sizeContainer($image.width(), $image.height());
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};
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// Preload image before showing
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preloader.src = this.album[imageNumber].link;
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this.currentImageIndex = imageNumber;
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};
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// Stretch overlay to fit the viewport
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Lightbox.prototype.sizeOverlay = function() {
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var self = this;
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/*
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We use a setTimeout 0 to pause JS execution and let the rendering catch-up.
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Why do this? If the `disableScrolling` option is set to true, a class is added to the body
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tag that disables scrolling and hides the scrollbar. We want to make sure the scrollbar is
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hidden before we measure the document width, as the presence of the scrollbar will affect the
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number.
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*/
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setTimeout(function() {
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self.$overlay
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.width($(document).width())
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.height($(document).height());
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}, 0);
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};
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// Animate the size of the lightbox to fit the image we are showing
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// This method also shows the the image.
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Lightbox.prototype.sizeContainer = function(imageWidth, imageHeight) {
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var self = this;
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var oldWidth = this.$outerContainer.outerWidth();
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var oldHeight = this.$outerContainer.outerHeight();
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var newWidth = imageWidth + this.containerPadding.left + this.containerPadding.right + this.imageBorderWidth.left + this.imageBorderWidth.right;
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var newHeight = imageHeight + this.containerPadding.top + this.containerPadding.bottom + this.imageBorderWidth.top + this.imageBorderWidth.bottom;
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function postResize() {
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self.$lightbox.find('.lb-dataContainer').width(newWidth);
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self.$lightbox.find('.lb-prevLink').height(newHeight);
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self.$lightbox.find('.lb-nextLink').height(newHeight);
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// Set focus on one of the two root nodes so keyboard events are captured.
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self.$overlay.trigger('focus');
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self.showImage();
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}
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if (oldWidth !== newWidth || oldHeight !== newHeight) {
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this.$outerContainer.animate({
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width: newWidth,
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height: newHeight
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}, this.options.resizeDuration, 'swing', function() {
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postResize();
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});
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} else {
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postResize();
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}
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};
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// Display the image and its details and begin preload neighboring images.
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Lightbox.prototype.showImage = function() {
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this.$lightbox.find('.lb-loader').stop(true).hide();
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this.$lightbox.find('.lb-image').fadeIn(this.options.imageFadeDuration);
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this.updateNav();
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this.updateDetails();
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this.preloadNeighboringImages();
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this.enableKeyboardNav();
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};
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// Display previous and next navigation if appropriate.
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Lightbox.prototype.updateNav = function() {
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// Check to see if the browser supports touch events. If so, we take the conservative approach
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// and assume that mouse hover events are not supported and always show prev/next navigation
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// arrows in image sets.
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var alwaysShowNav = false;
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try {
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document.createEvent('TouchEvent');
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alwaysShowNav = (this.options.alwaysShowNavOnTouchDevices) ? true : false;
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} catch (e) {}
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this.$lightbox.find('.lb-nav').show();
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if (this.album.length > 1) {
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if (this.options.wrapAround) {
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if (alwaysShowNav) {
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this.$lightbox.find('.lb-prev, .lb-next').css('opacity', '1');
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}
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this.$lightbox.find('.lb-prev, .lb-next').show();
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} else {
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if (this.currentImageIndex > 0) {
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this.$lightbox.find('.lb-prev').show();
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if (alwaysShowNav) {
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this.$lightbox.find('.lb-prev').css('opacity', '1');
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}
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}
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if (this.currentImageIndex < this.album.length - 1) {
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this.$lightbox.find('.lb-next').show();
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if (alwaysShowNav) {
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this.$lightbox.find('.lb-next').css('opacity', '1');
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}
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}
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}
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}
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};
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// Display caption, image number, and closing button.
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Lightbox.prototype.updateDetails = function() {
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var self = this;
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// Enable anchor clicks in the injected caption html.
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// Thanks Nate Wright for the fix. @https://github.com/NateWr
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if (typeof this.album[this.currentImageIndex].title !== 'undefined' &&
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this.album[this.currentImageIndex].title !== '') {
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var $caption = this.$lightbox.find('.lb-caption');
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if (this.options.sanitizeTitle) {
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$caption.text(this.album[this.currentImageIndex].title);
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} else {
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$caption.html(this.album[this.currentImageIndex].title);
|
|
}
|
|
$caption.fadeIn('fast');
|
|
}
|
|
|
|
if (this.album.length > 1 && this.options.showImageNumberLabel) {
|
|
var labelText = this.imageCountLabel(this.currentImageIndex + 1, this.album.length);
|
|
this.$lightbox.find('.lb-number').text(labelText).fadeIn('fast');
|
|
} else {
|
|
this.$lightbox.find('.lb-number').hide();
|
|
}
|
|
|
|
this.$outerContainer.removeClass('animating');
|
|
|
|
this.$lightbox.find('.lb-dataContainer').fadeIn(this.options.resizeDuration, function() {
|
|
return self.sizeOverlay();
|
|
});
|
|
};
|
|
|
|
// Preload previous and next images in set.
|
|
Lightbox.prototype.preloadNeighboringImages = function() {
|
|
if (this.album.length > this.currentImageIndex + 1) {
|
|
var preloadNext = new Image();
|
|
preloadNext.src = this.album[this.currentImageIndex + 1].link;
|
|
}
|
|
if (this.currentImageIndex > 0) {
|
|
var preloadPrev = new Image();
|
|
preloadPrev.src = this.album[this.currentImageIndex - 1].link;
|
|
}
|
|
};
|
|
|
|
Lightbox.prototype.enableKeyboardNav = function() {
|
|
this.$lightbox.on('keyup.keyboard', $.proxy(this.keyboardAction, this));
|
|
this.$overlay.on('keyup.keyboard', $.proxy(this.keyboardAction, this));
|
|
};
|
|
|
|
Lightbox.prototype.disableKeyboardNav = function() {
|
|
this.$lightbox.off('.keyboard');
|
|
this.$overlay.off('.keyboard');
|
|
};
|
|
|
|
Lightbox.prototype.keyboardAction = function(event) {
|
|
var KEYCODE_ESC = 27;
|
|
var KEYCODE_LEFTARROW = 37;
|
|
var KEYCODE_RIGHTARROW = 39;
|
|
|
|
var keycode = event.keyCode;
|
|
if (keycode === KEYCODE_ESC) {
|
|
// Prevent bubbling so as to not affect other components on the page.
|
|
event.stopPropagation();
|
|
this.end();
|
|
} else if (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 (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);
|
|
|
|
if (this.options.disableScrolling) {
|
|
$('body').removeClass('lb-disable-scrolling');
|
|
}
|
|
};
|
|
|
|
return new Lightbox();
|
|
}));
|