try bagguettebox script for a lightbox

app/static/js/lightbox/baguetteBox.css

@@ -0,0 +1,198 @@
+/*!
+ * baguetteBox.js
+ * @author  feimosi
+ * @version 1.11.1
+ * @url https://github.com/feimosi/baguetteBox.js
+ */
+#baguetteBox-overlay {
+  display: none;
+  opacity: 0;
+  position: fixed;
+  overflow: hidden;
+  top: 0;
+  left: 0;
+  width: 100%;
+  height: 100%;
+  z-index: 1000000;
+  background-color: #222;
+  background-color: rgba(0, 0, 0, 0.8);
+  -webkit-transition: opacity .5s ease;
+  transition: opacity .5s ease; }
+  #baguetteBox-overlay.visible {
+    opacity: 1; }
+  #baguetteBox-overlay .full-image {
+    display: inline-block;
+    position: relative;
+    width: 100%;
+    height: 100%;
+    text-align: center; }
+    #baguetteBox-overlay .full-image figure {
+      display: inline;
+      margin: 0;
+      height: 100%; }
+    #baguetteBox-overlay .full-image img {
+      display: inline-block;
+      width: auto;
+      height: auto;
+      max-height: 100%;
+      max-width: 100%;
+      vertical-align: middle;
+      -webkit-box-shadow: 0 0 8px rgba(0, 0, 0, 0.6);
+         -moz-box-shadow: 0 0 8px rgba(0, 0, 0, 0.6);
+              box-shadow: 0 0 8px rgba(0, 0, 0, 0.6); }
+    #baguetteBox-overlay .full-image figcaption {
+      display: block;
+      position: absolute;
+      bottom: 0;
+      width: 100%;
+      text-align: center;
+      line-height: 1.8;
+      white-space: normal;
+      color: #ccc;
+      background-color: #000;
+      background-color: rgba(0, 0, 0, 0.6);
+      font-family: sans-serif; }
+    #baguetteBox-overlay .full-image:before {
+      content: "";
+      display: inline-block;
+      height: 50%;
+      width: 1px;
+      margin-right: -1px; }
+
+#baguetteBox-slider {
+  position: absolute;
+  left: 0;
+  top: 0;
+  height: 100%;
+  width: 100%;
+  white-space: nowrap;
+  -webkit-transition: left .4s ease, -webkit-transform .4s ease;
+  transition: left .4s ease, -webkit-transform .4s ease;
+  transition: left .4s ease, transform .4s ease;
+  transition: left .4s ease, transform .4s ease, -webkit-transform .4s ease, -moz-transform .4s ease; }
+  #baguetteBox-slider.bounce-from-right {
+    -webkit-animation: bounceFromRight .4s ease-out;
+            animation: bounceFromRight .4s ease-out; }
+  #baguetteBox-slider.bounce-from-left {
+    -webkit-animation: bounceFromLeft .4s ease-out;
+            animation: bounceFromLeft .4s ease-out; }
+
+@-webkit-keyframes bounceFromRight {
+  0% {
+    margin-left: 0; }
+  50% {
+    margin-left: -30px; }
+  100% {
+    margin-left: 0; } }
+
+@keyframes bounceFromRight {
+  0% {
+    margin-left: 0; }
+  50% {
+    margin-left: -30px; }
+  100% {
+    margin-left: 0; } }
+
+@-webkit-keyframes bounceFromLeft {
+  0% {
+    margin-left: 0; }
+  50% {
+    margin-left: 30px; }
+  100% {
+    margin-left: 0; } }
+
+@keyframes bounceFromLeft {
+  0% {
+    margin-left: 0; }
+  50% {
+    margin-left: 30px; }
+  100% {
+    margin-left: 0; } }
+
+.baguetteBox-button#next-button, .baguetteBox-button#previous-button {
+  top: 50%;
+  top: calc(50% - 30px);
+  width: 44px;
+  height: 60px; }
+
+.baguetteBox-button {
+  position: absolute;
+  cursor: pointer;
+  outline: none;
+  padding: 0;
+  margin: 0;
+  border: 0;
+  -moz-border-radius: 15%;
+       border-radius: 15%;
+  background-color: #323232;
+  background-color: rgba(50, 50, 50, 0.5);
+  color: #ddd;
+  font: 1.6em sans-serif;
+  -webkit-transition: background-color .4s ease;
+  transition: background-color .4s ease; }
+  .baguetteBox-button:focus, .baguetteBox-button:hover {
+    background-color: rgba(50, 50, 50, 0.9); }
+  .baguetteBox-button#next-button {
+    right: 2%; }
+  .baguetteBox-button#previous-button {
+    left: 2%; }
+  .baguetteBox-button#close-button {
+    top: 20px;
+    right: 2%;
+    right: calc(2% + 6px);
+    width: 30px;
+    height: 30px; }
+  .baguetteBox-button svg {
+    position: absolute;
+    left: 0;
+    top: 0; }
+
+/*
+    Preloader
+    Borrowed from http://tobiasahlin.com/spinkit/
+*/
+.baguetteBox-spinner {
+  width: 40px;
+  height: 40px;
+  display: inline-block;
+  position: absolute;
+  top: 50%;
+  left: 50%;
+  margin-top: -20px;
+  margin-left: -20px; }
+
+.baguetteBox-double-bounce1,
+.baguetteBox-double-bounce2 {
+  width: 100%;
+  height: 100%;
+  -moz-border-radius: 50%;
+       border-radius: 50%;
+  background-color: #fff;
+  opacity: .6;
+  position: absolute;
+  top: 0;
+  left: 0;
+  -webkit-animation: bounce 2s infinite ease-in-out;
+          animation: bounce 2s infinite ease-in-out; }
+
+.baguetteBox-double-bounce2 {
+  -webkit-animation-delay: -1s;
+          animation-delay: -1s; }
+
+@-webkit-keyframes bounce {
+  0%, 100% {
+    -webkit-transform: scale(0);
+            transform: scale(0); }
+  50% {
+    -webkit-transform: scale(1);
+            transform: scale(1); } }
+
+@keyframes bounce {
+  0%, 100% {
+    -webkit-transform: scale(0);
+       -moz-transform: scale(0);
+            transform: scale(0); }
+  50% {
+    -webkit-transform: scale(1);
+       -moz-transform: scale(1);
+            transform: scale(1); } }

app/static/js/lightbox/baguetteBox.js

@@ -0,0 +1,793 @@
+/*!
+ * baguetteBox.js
+ * @author  feimosi
+ * @version 1.11.1
+ * @url https://github.com/feimosi/baguetteBox.js
+ */
+
+/* global define, module */
+
+(function (root, factory) {
+    'use strict';
+    if (typeof define === 'function' && define.amd) {
+        define(factory);
+    } else if (typeof exports === 'object') {
+        module.exports = factory();
+    } else {
+        root.baguetteBox = factory();
+    }
+}(this, function () {
+    'use strict';
+
+    // SVG shapes used on the buttons
+    var leftArrow = '<svg width="44" height="60">' +
+            '<polyline points="30 10 10 30 30 50" stroke="rgba(255,255,255,0.5)" stroke-width="4"' +
+              'stroke-linecap="butt" fill="none" stroke-linejoin="round"/>' +
+            '</svg>',
+        rightArrow = '<svg width="44" height="60">' +
+            '<polyline points="14 10 34 30 14 50" stroke="rgba(255,255,255,0.5)" stroke-width="4"' +
+              'stroke-linecap="butt" fill="none" stroke-linejoin="round"/>' +
+            '</svg>',
+        closeX = '<svg width="30" height="30">' +
+            '<g stroke="rgb(160,160,160)" stroke-width="4">' +
+            '<line x1="5" y1="5" x2="25" y2="25"/>' +
+            '<line x1="5" y1="25" x2="25" y2="5"/>' +
+            '</g></svg>';
+    // Global options and their defaults
+    var options = {},
+        defaults = {
+            captions: true,
+            buttons: 'auto',
+            fullScreen: false,
+            noScrollbars: false,
+            bodyClass: 'baguetteBox-open',
+            titleTag: false,
+            async: false,
+            preload: 2,
+            animation: 'slideIn',
+            afterShow: null,
+            afterHide: null,
+            onChange: null,
+            overlayBackgroundColor: 'rgba(0,0,0,.8)'
+        };
+    // Object containing information about features compatibility
+    var supports = {};
+    // DOM Elements references
+    var overlay, slider, previousButton, nextButton, closeButton;
+    // An array with all images in the current gallery
+    var currentGallery = [];
+    // Current image index inside the slider
+    var currentIndex = 0;
+    // Visibility of the overlay
+    var isOverlayVisible = false;
+    // Touch event start position (for slide gesture)
+    var touch = {};
+    // If set to true ignore touch events because animation was already fired
+    var touchFlag = false;
+    // Regex pattern to match image files
+    var regex = /.+\.(gif|jpe?g|png|webp)/i;
+    // Object of all used galleries
+    var data = {};
+    // Array containing temporary images DOM elements
+    var imagesElements = [];
+    // The last focused element before opening the overlay
+    var documentLastFocus = null;
+    var overlayClickHandler = function(event) {
+        // Close the overlay when user clicks directly on the background
+        if (event.target.id.indexOf('baguette-img') !== -1) {
+            hideOverlay();
+        }
+    };
+    var previousButtonClickHandler = function(event) {
+        event.stopPropagation ? event.stopPropagation() : event.cancelBubble = true; // eslint-disable-line no-unused-expressions
+        showPreviousImage();
+    };
+    var nextButtonClickHandler = function(event) {
+        event.stopPropagation ? event.stopPropagation() : event.cancelBubble = true; // eslint-disable-line no-unused-expressions
+        showNextImage();
+    };
+    var closeButtonClickHandler = function(event) {
+        event.stopPropagation ? event.stopPropagation() : event.cancelBubble = true; // eslint-disable-line no-unused-expressions
+        hideOverlay();
+    };
+    var touchstartHandler = function(event) {
+        touch.count++;
+        if (touch.count > 1) {
+            touch.multitouch = true;
+        }
+        // Save x and y axis position
+        touch.startX = event.changedTouches[0].pageX;
+        touch.startY = event.changedTouches[0].pageY;
+    };
+    var touchmoveHandler = function(event) {
+        // If action was already triggered or multitouch return
+        if (touchFlag || touch.multitouch) {
+            return;
+        }
+        event.preventDefault ? event.preventDefault() : event.returnValue = false; // eslint-disable-line no-unused-expressions
+        var touchEvent = event.touches[0] || event.changedTouches[0];
+        // Move at least 40 pixels to trigger the action
+        if (touchEvent.pageX - touch.startX > 40) {
+            touchFlag = true;
+            showPreviousImage();
+        } else if (touchEvent.pageX - touch.startX < -40) {
+            touchFlag = true;
+            showNextImage();
+        // Move 100 pixels up to close the overlay
+        } else if (touch.startY - touchEvent.pageY > 100) {
+            hideOverlay();
+        }
+    };
+    var touchendHandler = function() {
+        touch.count--;
+        if (touch.count <= 0) {
+            touch.multitouch = false;
+        }
+        touchFlag = false;
+    };
+    var contextmenuHandler = function() {
+        touchendHandler();
+    };
+
+    var trapFocusInsideOverlay = function(event) {
+        if (overlay.style.display === 'block' && (overlay.contains && !overlay.contains(event.target))) {
+            event.stopPropagation();
+            initFocus();
+        }
+    };
+
+    // forEach polyfill for IE8
+    // http://stackoverflow.com/a/14827443/1077846
+    /* eslint-disable */
+    if (![].forEach) {
+        Array.prototype.forEach = function(callback, thisArg) {
+            for (var i = 0; i < this.length; i++) {
+                callback.call(thisArg, this[i], i, this);
+            }
+        };
+    }
+
+    // filter polyfill for IE8
+    // https://gist.github.com/eliperelman/1031656
+    if (![].filter) {
+        Array.prototype.filter = function(a, b, c, d, e) {
+            c = this;
+            d = [];
+            for (e = 0; e < c.length; e++)
+                a.call(b, c[e], e, c) && d.push(c[e]);
+            return d;
+        };
+    }
+    /* eslint-enable */
+
+    // Script entry point
+    function run(selector, userOptions) {
+        // Fill supports object
+        supports.transforms = testTransformsSupport();
+        supports.svg = testSvgSupport();
+        supports.passiveEvents = testPassiveEventsSupport();
+
+        buildOverlay();
+        removeFromCache(selector);
+        return bindImageClickListeners(selector, userOptions);
+    }
+
+    function bindImageClickListeners(selector, userOptions) {
+        // For each gallery bind a click event to every image inside it
+        var galleryNodeList = document.querySelectorAll(selector);
+        var selectorData = {
+            galleries: [],
+            nodeList: galleryNodeList
+        };
+        data[selector] = selectorData;
+
+        [].forEach.call(galleryNodeList, function(galleryElement) {
+            if (userOptions && userOptions.filter) {
+                regex = userOptions.filter;
+            }
+
+            // Get nodes from gallery elements or single-element galleries
+            var tagsNodeList = [];
+            if (galleryElement.tagName === 'A') {
+                tagsNodeList = [galleryElement];
+            } else {
+                tagsNodeList = galleryElement.getElementsByTagName('a');
+            }
+
+            // Filter 'a' elements from those not linking to images
+            tagsNodeList = [].filter.call(tagsNodeList, function(element) {
+                if (element.className.indexOf(userOptions && userOptions.ignoreClass) === -1) {
+                    return regex.test(element.href);
+                }
+            });
+            if (tagsNodeList.length === 0) {
+                return;
+            }
+
+            var gallery = [];
+            [].forEach.call(tagsNodeList, function(imageElement, imageIndex) {
+                var imageElementClickHandler = function(event) {
+                    event.preventDefault ? event.preventDefault() : event.returnValue = false; // eslint-disable-line no-unused-expressions
+                    prepareOverlay(gallery, userOptions);
+                    showOverlay(imageIndex);
+                };
+                var imageItem = {
+                    eventHandler: imageElementClickHandler,
+                    imageElement: imageElement
+                };
+                bind(imageElement, 'click', imageElementClickHandler);
+                gallery.push(imageItem);
+            });
+            selectorData.galleries.push(gallery);
+        });
+
+        return selectorData.galleries;
+    }
+
+    function clearCachedData() {
+        for (var selector in data) {
+            if (data.hasOwnProperty(selector)) {
+                removeFromCache(selector);
+            }
+        }
+    }
+
+    function removeFromCache(selector) {
+        if (!data.hasOwnProperty(selector)) {
+            return;
+        }
+        var galleries = data[selector].galleries;
+        [].forEach.call(galleries, function(gallery) {
+            [].forEach.call(gallery, function(imageItem) {
+                unbind(imageItem.imageElement, 'click', imageItem.eventHandler);
+            });
+
+            if (currentGallery === gallery) {
+                currentGallery = [];
+            }
+        });
+
+        delete data[selector];
+    }
+
+    function buildOverlay() {
+        overlay = getByID('baguetteBox-overlay');
+        // Check if the overlay already exists
+        if (overlay) {
+            slider = getByID('baguetteBox-slider');
+            previousButton = getByID('previous-button');
+            nextButton = getByID('next-button');
+            closeButton = getByID('close-button');
+            return;
+        }
+        // Create overlay element
+        overlay = create('div');
+        overlay.setAttribute('role', 'dialog');
+        overlay.id = 'baguetteBox-overlay';
+        document.getElementsByTagName('body')[0].appendChild(overlay);
+        // Create gallery slider element
+        slider = create('div');
+        slider.id = 'baguetteBox-slider';
+        overlay.appendChild(slider);
+        // Create all necessary buttons
+        previousButton = create('button');
+        previousButton.setAttribute('type', 'button');
+        previousButton.id = 'previous-button';
+        previousButton.setAttribute('aria-label', 'Previous');
+        previousButton.innerHTML = supports.svg ? leftArrow : '&lt;';
+        overlay.appendChild(previousButton);
+
+        nextButton = create('button');
+        nextButton.setAttribute('type', 'button');
+        nextButton.id = 'next-button';
+        nextButton.setAttribute('aria-label', 'Next');
+        nextButton.innerHTML = supports.svg ? rightArrow : '&gt;';
+        overlay.appendChild(nextButton);
+
+        closeButton = create('button');
+        closeButton.setAttribute('type', 'button');
+        closeButton.id = 'close-button';
+        closeButton.setAttribute('aria-label', 'Close');
+        closeButton.innerHTML = supports.svg ? closeX : '&times;';
+        overlay.appendChild(closeButton);
+
+        previousButton.className = nextButton.className = closeButton.className = 'baguetteBox-button';
+
+        bindEvents();
+    }
+
+    function keyDownHandler(event) {
+        switch (event.keyCode) {
+        case 37: // Left arrow
+            showPreviousImage();
+            break;
+        case 39: // Right arrow
+            showNextImage();
+            break;
+        case 27: // Esc
+            hideOverlay();
+            break;
+        case 36: // Home
+            showFirstImage(event);
+            break;
+        case 35: // End
+            showLastImage(event);
+            break;
+        }
+    }
+
+    function bindEvents() {
+        var passiveEvent = supports.passiveEvents ? { passive: false } : null;
+        var nonPassiveEvent = supports.passiveEvents ? { passive: true } : null;
+
+        bind(overlay, 'click', overlayClickHandler);
+        bind(previousButton, 'click', previousButtonClickHandler);
+        bind(nextButton, 'click', nextButtonClickHandler);
+        bind(closeButton, 'click', closeButtonClickHandler);
+        bind(slider, 'contextmenu', contextmenuHandler);
+        bind(overlay, 'touchstart', touchstartHandler, nonPassiveEvent);
+        bind(overlay, 'touchmove', touchmoveHandler, passiveEvent);
+        bind(overlay, 'touchend', touchendHandler);
+        bind(document, 'focus', trapFocusInsideOverlay, true);
+    }
+
+    function unbindEvents() {
+        var passiveEvent = supports.passiveEvents ? { passive: false } : null;
+        var nonPassiveEvent = supports.passiveEvents ? { passive: true } : null;
+
+        unbind(overlay, 'click', overlayClickHandler);
+        unbind(previousButton, 'click', previousButtonClickHandler);
+        unbind(nextButton, 'click', nextButtonClickHandler);
+        unbind(closeButton, 'click', closeButtonClickHandler);
+        unbind(slider, 'contextmenu', contextmenuHandler);
+        unbind(overlay, 'touchstart', touchstartHandler, nonPassiveEvent);
+        unbind(overlay, 'touchmove', touchmoveHandler, passiveEvent);
+        unbind(overlay, 'touchend', touchendHandler);
+        unbind(document, 'focus', trapFocusInsideOverlay, true);
+    }
+
+    function prepareOverlay(gallery, userOptions) {
+        // If the same gallery is being opened prevent from loading it once again
+        if (currentGallery === gallery) {
+            return;
+        }
+        currentGallery = gallery;
+        // Update gallery specific options
+        setOptions(userOptions);
+        // Empty slider of previous contents (more effective than .innerHTML = "")
+        while (slider.firstChild) {
+            slider.removeChild(slider.firstChild);
+        }
+        imagesElements.length = 0;
+
+        var imagesFiguresIds = [];
+        var imagesCaptionsIds = [];
+        // Prepare and append images containers and populate figure and captions IDs arrays
+        for (var i = 0, fullImage; i < gallery.length; i++) {
+            fullImage = create('div');
+            fullImage.className = 'full-image';
+            fullImage.id = 'baguette-img-' + i;
+            imagesElements.push(fullImage);
+
+            imagesFiguresIds.push('baguetteBox-figure-' + i);
+            imagesCaptionsIds.push('baguetteBox-figcaption-' + i);
+            slider.appendChild(imagesElements[i]);
+        }
+        overlay.setAttribute('aria-labelledby', imagesFiguresIds.join(' '));
+        overlay.setAttribute('aria-describedby', imagesCaptionsIds.join(' '));
+    }
+
+    function setOptions(newOptions) {
+        if (!newOptions) {
+            newOptions = {};
+        }
+        // Fill options object
+        for (var item in defaults) {
+            options[item] = defaults[item];
+            if (typeof newOptions[item] !== 'undefined') {
+                options[item] = newOptions[item];
+            }
+        }
+        /* Apply new options */
+        // Change transition for proper animation
+        slider.style.transition = slider.style.webkitTransition = (options.animation === 'fadeIn' ? 'opacity .4s ease' :
+            options.animation === 'slideIn' ? '' : 'none');
+        // Hide buttons if necessary
+        if (options.buttons === 'auto' && ('ontouchstart' in window || currentGallery.length === 1)) {
+            options.buttons = false;
+        }
+        // Set buttons style to hide or display them
+        previousButton.style.display = nextButton.style.display = (options.buttons ? '' : 'none');
+        // Set overlay color
+        try {
+            overlay.style.backgroundColor = options.overlayBackgroundColor;
+        } catch (e) {
+            // Silence the error and continue
+        }
+    }
+
+    function showOverlay(chosenImageIndex) {
+        if (options.noScrollbars) {
+            document.documentElement.style.overflowY = 'hidden';
+            document.body.style.overflowY = 'scroll';
+        }
+        if (overlay.style.display === 'block') {
+            return;
+        }
+
+        bind(document, 'keydown', keyDownHandler);
+        currentIndex = chosenImageIndex;
+        touch = {
+            count: 0,
+            startX: null,
+            startY: null
+        };
+        loadImage(currentIndex, function() {
+            preloadNext(currentIndex);
+            preloadPrev(currentIndex);
+        });
+
+        updateOffset();
+        overlay.style.display = 'block';
+        if (options.fullScreen) {
+            enterFullScreen();
+        }
+        // Fade in overlay
+        setTimeout(function() {
+            overlay.className = 'visible';
+            if (options.bodyClass && document.body.classList) {
+                document.body.classList.add(options.bodyClass);
+            }
+            if (options.afterShow) {
+                options.afterShow();
+            }
+        }, 50);
+        if (options.onChange) {
+            options.onChange(currentIndex, imagesElements.length);
+        }
+        documentLastFocus = document.activeElement;
+        initFocus();
+        isOverlayVisible = true;
+    }
+
+    function initFocus() {
+        if (options.buttons) {
+            previousButton.focus();
+        } else {
+            closeButton.focus();
+        }
+    }
+
+    function enterFullScreen() {
+        if (overlay.requestFullscreen) {
+            overlay.requestFullscreen();
+        } else if (overlay.webkitRequestFullscreen) {
+            overlay.webkitRequestFullscreen();
+        } else if (overlay.mozRequestFullScreen) {
+            overlay.mozRequestFullScreen();
+        }
+    }
+
+    function exitFullscreen() {
+        if (document.exitFullscreen) {
+            document.exitFullscreen();
+        } else if (document.mozCancelFullScreen) {
+            document.mozCancelFullScreen();
+        } else if (document.webkitExitFullscreen) {
+            document.webkitExitFullscreen();
+        }
+    }
+
+    function hideOverlay() {
+        if (options.noScrollbars) {
+            document.documentElement.style.overflowY = 'auto';
+            document.body.style.overflowY = 'auto';
+        }
+        if (overlay.style.display === 'none') {
+            return;
+        }
+
+        unbind(document, 'keydown', keyDownHandler);
+        // Fade out and hide the overlay
+        overlay.className = '';
+        setTimeout(function() {
+            overlay.style.display = 'none';
+            if (document.fullscreen) {
+                exitFullscreen();
+            }
+            if (options.bodyClass && document.body.classList) {
+                document.body.classList.remove(options.bodyClass);
+            }
+            if (options.afterHide) {
+                options.afterHide();
+            }
+            documentLastFocus && documentLastFocus.focus();
+            isOverlayVisible = false;
+        }, 500);
+    }
+
+    function loadImage(index, callback) {
+        var imageContainer = imagesElements[index];
+        var galleryItem = currentGallery[index];
+
+        // Return if the index exceeds prepared images in the overlay
+        // or if the current gallery has been changed / closed
+        if (typeof imageContainer === 'undefined' || typeof galleryItem === 'undefined') {
+            return;
+        }
+
+        // If image is already loaded run callback and return
+        if (imageContainer.getElementsByTagName('img')[0]) {
+            if (callback) {
+                callback();
+            }
+            return;
+        }
+
+        // Get element reference, optional caption and source path
+        var imageElement = galleryItem.imageElement;
+        var thumbnailElement = imageElement.getElementsByTagName('img')[0];
+        var imageCaption = typeof options.captions === 'function' ?
+            options.captions.call(currentGallery, imageElement) :
+            imageElement.getAttribute('data-caption') || imageElement.title;
+        var imageSrc = getImageSrc(imageElement);
+
+        // Prepare figure element
+        var figure = create('figure');
+        figure.id = 'baguetteBox-figure-' + index;
+        figure.innerHTML = '<div class="baguetteBox-spinner">' +
+            '<div class="baguetteBox-double-bounce1"></div>' +
+            '<div class="baguetteBox-double-bounce2"></div>' +
+            '</div>';
+        // Insert caption if available
+        if (options.captions && imageCaption) {
+            var figcaption = create('figcaption');
+            figcaption.id = 'baguetteBox-figcaption-' + index;
+            figcaption.innerHTML = imageCaption;
+            figure.appendChild(figcaption);
+        }
+        imageContainer.appendChild(figure);
+
+        // Prepare gallery img element
+        var image = create('img');
+        image.onload = function() {
+            // Remove loader element
+            var spinner = document.querySelector('#baguette-img-' + index + ' .baguetteBox-spinner');
+            figure.removeChild(spinner);
+            if (!options.async && callback) {
+                callback();
+            }
+        };
+        image.setAttribute('src', imageSrc);
+        image.alt = thumbnailElement ? thumbnailElement.alt || '' : '';
+        if (options.titleTag && imageCaption) {
+            image.title = imageCaption;
+        }
+        figure.appendChild(image);
+
+        // Run callback
+        if (options.async && callback) {
+            callback();
+        }
+    }
+
+    // Get image source location, mostly used for responsive images
+    function getImageSrc(image) {
+        // Set default image path from href
+        var result = image.href;
+        // If dataset is supported find the most suitable image
+        if (image.dataset) {
+            var srcs = [];
+            // Get all possible image versions depending on the resolution
+            for (var item in image.dataset) {
+                if (item.substring(0, 3) === 'at-' && !isNaN(item.substring(3))) {
+                    srcs[item.replace('at-', '')] = image.dataset[item];
+                }
+            }
+            // Sort resolutions ascending
+            var keys = Object.keys(srcs).sort(function(a, b) {
+                return parseInt(a, 10) < parseInt(b, 10) ? -1 : 1;
+            });
+            // Get real screen resolution
+            var width = window.innerWidth * window.devicePixelRatio;
+            // Find the first image bigger than or equal to the current width
+            var i = 0;
+            while (i < keys.length - 1 && keys[i] < width) {
+                i++;
+            }
+            result = srcs[keys[i]] || result;
+        }
+        return result;
+    }
+
+    // Return false at the right end of the gallery
+    function showNextImage() {
+        return show(currentIndex + 1);
+    }
+
+    // Return false at the left end of the gallery
+    function showPreviousImage() {
+        return show(currentIndex - 1);
+    }
+
+    // Return false at the left end of the gallery
+    function showFirstImage(event) {
+        if (event) {
+            event.preventDefault();
+        }
+        return show(0);
+    }
+
+    // Return false at the right end of the gallery
+    function showLastImage(event) {
+        if (event) {
+            event.preventDefault();
+        }
+        return show(currentGallery.length - 1);
+    }
+
+    /**
+     * Move the gallery to a specific index
+     * @param `index` {number} - the position of the image
+     * @param `gallery` {array} - gallery which should be opened, if omitted assumes the currently opened one
+     * @return {boolean} - true on success or false if the index is invalid
+     */
+    function show(index, gallery) {
+        if (!isOverlayVisible && index >= 0 && index < gallery.length) {
+            prepareOverlay(gallery, options);
+            showOverlay(index);
+            return true;
+        }
+        if (index < 0) {
+            if (options.animation) {
+                bounceAnimation('left');
+            }
+            return false;
+        }
+        if (index >= imagesElements.length) {
+            if (options.animation) {
+                bounceAnimation('right');
+            }
+            return false;
+        }
+
+        currentIndex = index;
+        loadImage(currentIndex, function() {
+            preloadNext(currentIndex);
+            preloadPrev(currentIndex);
+        });
+        updateOffset();
+
+        if (options.onChange) {
+            options.onChange(currentIndex, imagesElements.length);
+        }
+
+        return true;
+    }
+
+    /**
+     * Triggers the bounce animation
+     * @param {('left'|'right')} direction - Direction of the movement
+     */
+    function bounceAnimation(direction) {
+        slider.className = 'bounce-from-' + direction;
+        setTimeout(function() {
+            slider.className = '';
+        }, 400);
+    }
+
+    function updateOffset() {
+        var offset = -currentIndex * 100 + '%';
+        if (options.animation === 'fadeIn') {
+            slider.style.opacity = 0;
+            setTimeout(function() {
+                supports.transforms ?
+                    slider.style.transform = slider.style.webkitTransform = 'translate3d(' + offset + ',0,0)'
+                    : slider.style.left = offset;
+                slider.style.opacity = 1;
+            }, 400);
+        } else {
+            supports.transforms ?
+                slider.style.transform = slider.style.webkitTransform = 'translate3d(' + offset + ',0,0)'
+                : slider.style.left = offset;
+        }
+    }
+
+    // CSS 3D Transforms test
+    function testTransformsSupport() {
+        var div = create('div');
+        return typeof div.style.perspective !== 'undefined' || typeof div.style.webkitPerspective !== 'undefined';
+    }
+
+    // Inline SVG test
+    function testSvgSupport() {
+        var div = create('div');
+        div.innerHTML = '<svg/>';
+        return (div.firstChild && div.firstChild.namespaceURI) === 'http://www.w3.org/2000/svg';
+    }
+
+    // Borrowed from https://github.com/seiyria/bootstrap-slider/pull/680/files
+    /* eslint-disable getter-return */
+    function testPassiveEventsSupport() {
+        var passiveEvents = false;
+        try {
+            var opts = Object.defineProperty({}, 'passive', {
+                get: function() {
+                    passiveEvents = true;
+                }
+            });
+            window.addEventListener('test', null, opts);
+        } catch (e) { /* Silence the error and continue */ }
+
+        return passiveEvents;
+    }
+    /* eslint-enable getter-return */
+
+    function preloadNext(index) {
+        if (index - currentIndex >= options.preload) {
+            return;
+        }
+        loadImage(index + 1, function() {
+            preloadNext(index + 1);
+        });
+    }
+
+    function preloadPrev(index) {
+        if (currentIndex - index >= options.preload) {
+            return;
+        }
+        loadImage(index - 1, function() {
+            preloadPrev(index - 1);
+        });
+    }
+
+    function bind(element, event, callback, options) {
+        if (element.addEventListener) {
+            element.addEventListener(event, callback, options);
+        } else {
+            // IE8 fallback
+            element.attachEvent('on' + event, function(event) {
+                // `event` and `event.target` are not provided in IE8
+                event = event || window.event;
+                event.target = event.target || event.srcElement;
+                callback(event);
+            });
+        }
+    }
+
+    function unbind(element, event, callback, options) {
+        if (element.removeEventListener) {
+            element.removeEventListener(event, callback, options);
+        } else {
+            // IE8 fallback
+            element.detachEvent('on' + event, callback);
+        }
+    }
+
+    function getByID(id) {
+        return document.getElementById(id);
+    }
+
+    function create(element) {
+        return document.createElement(element);
+    }
+
+    function destroyPlugin() {
+        unbindEvents();
+        clearCachedData();
+        unbind(document, 'keydown', keyDownHandler);
+        document.getElementsByTagName('body')[0].removeChild(document.getElementById('baguetteBox-overlay'));
+        data = {};
+        currentGallery = [];
+        currentIndex = 0;
+    }
+
+    return {
+        run: run,
+        show: show,
+        showNext: showNextImage,
+        showPrevious: showPreviousImage,
+        hide: hideOverlay,
+        destroy: destroyPlugin
+    };
+}));

app/static/js/scripts.js

@@ -12,8 +12,37 @@ document.addEventListener("DOMContentLoaded", function () {
     setupTopicChooser();
     setupConversationChooser();
     setupMarkdownEditorEnabler();
+    setupLightboxGallery();
 });
 
+function setupLightboxGallery() {
+    // Check if there are elements with either "post_list_masonry_wide" or "post_list_masonry" class
+    var widePosts = document.querySelectorAll('.post_list_masonry_wide');
+    var regularPosts = document.querySelectorAll('.post_list_masonry');
+
+    // Enable lightbox on masonry images
+    if (widePosts.length > 0) {
+        baguetteBox.run('.post_list_masonry_wide', {
+            fullScreen: false,
+            titleTag: true,
+            buttons: true,
+            captions: function(element) {
+                return element.getElementsByTagName('img')[0].title;
+            }
+        });
+    }
+    if (regularPosts.length > 0) {
+        baguetteBox.run('.post_list_masonry', {
+            fullScreen: false,
+            titleTag: true,
+            buttons: true,
+            captions: function(element) {
+                return element.getElementsByTagName('img')[0].title;
+            }
+        });
+    }
+}
+
 
 // fires after all resources have loaded, including stylesheets and js files
 window.addEventListener("load", function () {

app/templates/base.html

@@ -43,6 +43,7 @@
             <link href="{{ url_for('static', filename='themes/high_contrast/styles.css') }}" type="text/css" rel="alternate stylesheet" title="High contrast" />
             {% if not low_bandwidth %}
                 <link href="{{ url_for('static', filename='js/markdown/downarea.css') }}" type="text/css" rel="stylesheet" />
+                <link href="{{ url_for('static', filename='js/lightbox/baguetteBox.css') }}" type="text/css" rel="stylesheet" />
             {% endif %}
             {% if theme() and file_exists('app/templates/themes/' + theme() + '/styles.css') %}
                 <link href="{{ url_for('static', filename='themes/' + theme() + '/styles.css') }}" type="text/css" rel="stylesheet" />
@@ -234,6 +235,7 @@
     {% endblock %}
     {% if not low_bandwidth %}
         {{ str(bootstrap.load_js()).replace('<script ', '<script nonce="' + session['nonce'] + '" ')|safe }}
+        <script src="{{ url_for('static', filename='js/lightbox/baguetteBox.js') }}" nonce="{{ session['nonce'] }}"></script>
     {% endif %}
     <script type="text/javascript" src="{{ url_for('static', filename='js/htmx.min.js') }}"></script>
     <script type="text/javascript" src="{{ url_for('static', filename='js/scripts.js', changed=getmtime('js/scripts.js')) }}"></script>

app/templates/post/_post_teaser_masonry.html

@@ -13,18 +13,21 @@
             <div class="masonry_thumb" title="{{ post.title }}">
                 {% if post.type == POST_TYPE_LINK %}
                     {% if post.image.medium_url() %}
-                        <a href="{{ post.url }}" rel="nofollow ugc" target="_blank" data-fslightbox data-type="image"  aria-label="{{ _('View image') }}"><img src="{{ post.image.medium_url() }}"
+                        <a href="{{ post.url }}" data-at-450="{{ post.image.medium_url() }}" rel="nofollow ugc" target="_blank" aria-label="{{ _('View image') }}"><img src="{{ post.image.medium_url() }}"
-                           alt="{{ post.image.alt_text if post.image.alt_text else '' }}" loading="lazy" width="{{ post.image.width }}" height="{{ post.image.height }}" /></a>
+                           alt="{{ post.image.alt_text if post.image.alt_text else '' }}" title="{{ post.title }}"
+                           loading="lazy" width="{{ post.image.width }}" height="{{ post.image.height }}" /></a>
                     {% elif post.image.source_url %}
-                        <a href="{{ post.url }}" rel="nofollow ugc" target="_blank" data-fslightbox data-type="image"  aria-label="{{ _('View image') }}"><img src="{{ post.image.source_url }}"
+                        <a href="{{ post.url }}" data-at-450="{{ post.image.medium_url() }}" rel="nofollow ugc" target="_blank" aria-label="{{ _('View image') }}"><img src="{{ post.image.source_url }}"
-                           alt="{{ post.title }}" loading="lazy" /></a>
+                           alt="{{ post.title }}" title="{{ post.title }}" loading="lazy" /></a>
                     {% else %}
-                        <a href="{{ post.url }}" rel="nofollow ugc" target="_blank" data-fslightbox data-type="image" aria-label="{{ _('View image') }}"><img src="{{ post.url }}"
+                        <a href="{{ post.url }}" data-at-450="{{ post.image.medium_url() }}" rel="nofollow ugc" target="_blank" aria-label="{{ _('View image') }}"><img src="{{ post.url }}"
-                           alt="{{ post.title }}" loading="{{ 'lazy' if low_bandwidth else 'eager' }}" /></a>
+                           alt="{{ post.title }}" title="{{ post.title }}"
+                           loading="{{ 'lazy' if low_bandwidth else 'eager' }}" /></a>
                     {% endif %}
                 {% elif post.type == POST_TYPE_IMAGE %}
-                        <a href="{{ post.image.view_url() }}" rel="nofollow ugc" data-fslightbox data-type="image"  target="_blank"><img src="{{ post.image.medium_url() }}"
+                        <a href="{{ post.image.view_url() }}" data-at-450="{{ post.image.medium_url() }}" rel="nofollow ugc" target="_blank"><img src="{{ post.image.medium_url() }}"
-                        alt="{{ post.image.alt_text if post.image.alt_text else '' }}" loading="lazy" width="{{ post.image.width }}" height="{{ post.image.height }}" /></a>
+                        alt="{{ post.image.alt_text if post.image.alt_text else '' }}" title="{{ post.title }}"
+                        loading="lazy" width="{{ post.image.width }}" height="{{ post.image.height }}" /></a>
                 {% else %}
                     <a href="{{ url_for('activitypub.post_ap', post_id=post.id) }}"><img src="{{ post.image.thumbnail_url() }}"
                         alt="{{ post.image.alt_text if post.image.alt_text else '' }}" loading="lazy" /></a>
@@ -49,8 +52,9 @@
         {% else %}
             {% if post.url and (post.url.endswith('.jpg') or post.url.endswith('.webp') or post.url.endswith('.png') or post.url.endswith('.gif') or post.url.endswith('.avif')  or post.url.endswith('.jpeg')) %}
                 <div class="masonry_thumb" title="{{ post.title }}">
-                    <a href="{{ post.url }}" rel="nofollow ugc" target="_blank" aria-label="{{ _('See image') }}"><img src="{{ post.url }}"
+                    <a href="{{ post.url }}" rel="nofollow ugc" target="_blank" aria-label="{{ _('View image') }}"><img src="{{ post.url }}"
-                           alt="{{ post.title }}" loading="{{ 'lazy' if low_bandwidth else 'eager' }}" /></a>
+                           alt="{{ post.title }}" title="{{ post.title }}"
+                           loading="{{ 'lazy' if low_bandwidth else 'eager' }}" /></a>
                 </div>
                 <div class="masonry_info">
                     <div class="row">