412 lines
14 KiB
JavaScript
412 lines
14 KiB
JavaScript
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/**
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* Lightbox v2.7.1
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* by Lokesh Dhakar - http://lokeshdhakar.com/projects/lightbox2/
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*
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* @license http://creativecommons.org/licenses/by/2.5/
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* - Free for use in both personal and commercial projects
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* - Attribution requires leaving author name, author link, and the license info intact
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*/
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(function() {
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// Use local alias
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var $ = jQuery;
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var LightboxOptions = (function() {
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function LightboxOptions() {
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this.fadeDuration = 500;
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this.fitImagesInViewport = true;
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this.resizeDuration = 700;
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this.positionFromTop = 50;
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this.showImageNumberLabel = true;
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this.alwaysShowNavOnTouchDevices = false;
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this.wrapAround = false;
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}
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// Change to localize to non-english language
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LightboxOptions.prototype.albumLabel = function(curImageNum, albumSize) {
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return "Image " + curImageNum + " of " + albumSize;
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};
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return LightboxOptions;
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})();
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var Lightbox = (function() {
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function Lightbox(options) {
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this.options = 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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}
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Lightbox.prototype.init = function() {
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this.enable();
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this.build();
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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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var self = this;
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$("<div id='lightboxOverlay' class='lightboxOverlay'></div><div id='lightbox' class='lightbox'><div class='lb-outerContainer'><div class='lb-container'><img class='lb-image' src='' /><div class='lb-nav'><a class='lb-prev' href='' ></a><a class='lb-next' href='' ></a></div><div class='lb-loader'><a class='lb-cancel'></a></div></div></div><div class='lb-dataContainer'><div class='lb-data'><div class='lb-details'><span class='lb-caption'></span><span class='lb-number'></span></div><div class='lb-closeContainer'><a class='lb-close'></a></div></div></div></div>").appendTo($('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.$lightbox.find('.lb-container');
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// Store css values for future lookup
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this.containerTopPadding = parseInt(this.$container.css('padding-top'), 10);
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this.containerRightPadding = parseInt(this.$container.css('padding-right'), 10);
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this.containerBottomPadding = parseInt(this.$container.css('padding-bottom'), 10);
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this.containerLeftPadding = parseInt(this.$container.css('padding-left'), 10);
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// Attach event handlers to the newly minted DOM elements
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this.$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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return false;
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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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this.$lightbox.find('.lb-loader, .lb-close').on('click', function() {
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self.end();
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return false;
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});
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};
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// Show overlay and lightbox. If the image is part of a set, add siblings to album array.
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Lightbox.prototype.start = function($link) {
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var self = this;
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var $window = $(window);
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$window.on('resize', $.proxy(this.sizeOverlay, this));
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$('select, object, embed').css({
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visibility: "hidden"
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});
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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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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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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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this.disableKeyboardNav();
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var $image = this.$lightbox.find('.lb-image');
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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 $preloader, imageHeight, imageWidth, maxImageHeight, maxImageWidth, windowHeight, windowWidth;
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$image.attr('src', self.album[imageNumber].link);
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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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if (self.options.fitImagesInViewport) {
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// Fit image inside the 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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windowWidth = $(window).width();
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windowHeight = $(window).height();
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maxImageWidth = windowWidth - self.containerLeftPadding - self.containerRightPadding - 20;
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maxImageHeight = windowHeight - self.containerTopPadding - self.containerBottomPadding - 120;
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// Is there a fitting issue?
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if ((preloader.width > maxImageWidth) || (preloader.height > maxImageHeight)) {
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if ((preloader.width / maxImageWidth) > (preloader.height / maxImageHeight)) {
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imageWidth = maxImageWidth;
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imageHeight = parseInt(preloader.height / (preloader.width / imageWidth), 10);
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$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(), $image.height());
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};
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preloader.src = this.album[imageNumber].link;
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this.currentImageIndex = imageNumber;
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};
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// Stretch overlay to fit the viewport
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Lightbox.prototype.sizeOverlay = function() {
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this.$overlay
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.width($(window).width())
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.height($(document).height());
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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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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.containerLeftPadding + this.containerRightPadding;
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var newHeight = imageHeight + this.containerTopPadding + this.containerBottomPadding;
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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.$lightbox.find('.lb-nextLink').height(newHeight);
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self.showImage();
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}
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if (oldWidth !== newWidth || oldHeight !== newHeight) {
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this.$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 it's details and begin preload neighboring images.
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Lightbox.prototype.showImage = function() {
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this.$lightbox.find('.lb-loader').hide();
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this.$lightbox.find('.lb-image').fadeIn('slow');
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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.$lightbox.find('.lb-next').css('opacity', '1');
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}
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}
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}
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}
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};
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// Display caption, image number, and closing button.
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Lightbox.prototype.updateDetails = function() {
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var self = this;
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// Enable anchor clicks in the injected caption html.
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// Thanks Nate Wright for the fix. @https://github.com/NateWr
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if (typeof this.album[this.currentImageIndex].title !== 'undefined' && this.album[this.currentImageIndex].title !== "") {
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this.$lightbox.find('.lb-caption')
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.html(this.album[this.currentImageIndex].title)
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.fadeIn('fast')
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.find('a').on('click', function(event){
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location.href = $(this).attr('href');
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});
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}
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if (this.album.length > 1 && this.options.showImageNumberLabel) {
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this.$lightbox.find('.lb-number').text(this.options.albumLabel(this.currentImageIndex + 1, this.album.length)).fadeIn('fast');
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} else {
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this.$lightbox.find('.lb-number').hide();
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}
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this.$outerContainer.removeClass('animating');
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this.$lightbox.find('.lb-dataContainer').fadeIn(this.options.resizeDuration, function() {
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return self.sizeOverlay();
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});
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};
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// Preload previous and next images in set.
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Lightbox.prototype.preloadNeighboringImages = function() {
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if (this.album.length > this.currentImageIndex + 1) {
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var preloadNext = new Image();
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preloadNext.src = this.album[this.currentImageIndex + 1].link;
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}
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if (this.currentImageIndex > 0) {
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var preloadPrev = new Image();
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preloadPrev.src = this.album[this.currentImageIndex - 1].link;
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}
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};
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Lightbox.prototype.enableKeyboardNav = function() {
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$(document).on('keyup.keyboard', $.proxy(this.keyboardAction, this));
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};
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Lightbox.prototype.disableKeyboardNav = function() {
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$(document).off('.keyboard');
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};
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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 Lightbox;
|
||
|
|
|
||
|
|
})();
|
||
|
|
|
||
|
|
$(function() {
|
||
|
|
var options = new LightboxOptions();
|
||
|
|
var lightbox = new Lightbox(options);
|
||
|
|
});
|
||
|
|
|
||
|
|
}).call(this);
|