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var initPhotoSwipeFromDOM = function(gallerySelector) {

    // parse slide data (url, title, size ...) from DOM elements 
    // (children of gallerySelector)
    var parseThumbnailElements = function(el) {
        var thumbElements = el.childNodes,
            numNodes = thumbElements.length,
            items = [],
            figureEl,
            linkEl,
            size,
            item;

        for(var i = 0; i < numNodes; i++) {

            figureEl = thumbElements[i]; // 
element // include only element nodes if(figureEl.nodeType !== 1) { continue; } linkEl = figureEl.children[0]; // element size = linkEl.getAttribute('data-size').split('x'); // create slide object item = { src: linkEl.getAttribute('href'), w: parseInt(size[0], 10), h: parseInt(size[1], 10) }; if(figureEl.children.length > 1) { //
content item.title = figureEl.children[1].innerHTML; } if(linkEl.children.length > 0) { // thumbnail element, retrieving thumbnail url item.msrc = linkEl.children[0].getAttribute('src'); } item.el = figureEl; // save link to element for getThumbBoundsFn items.push(item); } return items; }; // find nearest parent element var closest = function closest(el, fn) { return el && ( fn(el) ? el : closest(el.parentNode, fn) ); }; // triggers when user clicks on thumbnail var onThumbnailsClick = function(e) { e = e || window.event; e.preventDefault ? e.preventDefault() : e.returnValue = false; var eTarget = e.target || e.srcElement; // find root element of slide var clickedListItem = closest(eTarget, function(el) { return (el.tagName && el.tagName.toUpperCase() === 'FIGURE'); }); if(!clickedListItem) { return; } // find index of clicked item by looping through all child nodes // alternatively, you may define index via data- attribute var clickedGallery = clickedListItem.parentNode, childNodes = clickedListItem.parentNode.childNodes, numChildNodes = childNodes.length, nodeIndex = 0, index; for (var i = 0; i < numChildNodes; i++) { if(childNodes[i].nodeType !== 1) { continue; } if(childNodes[i] === clickedListItem) { index = nodeIndex; break; } nodeIndex++; } if(index >= 0) { // open PhotoSwipe if valid index found openPhotoSwipe( index, clickedGallery ); } return false; }; // parse picture index and gallery index from URL (#&pid=1&gid=2) var photoswipeParseHash = function() { var hash = window.location.hash.substring(1), params = {}; if(hash.length < 5) { return params; } var vars = hash.split('&'); for (var i = 0; i < vars.length; i++) { if(!vars[i]) { continue; } var pair = vars[i].split('='); if(pair.length < 2) { continue; } params[pair[0]] = pair[1]; } if(params.gid) { params.gid = parseInt(params.gid, 10); } return params; }; var openPhotoSwipe = function(index, galleryElement, disableAnimation, fromURL) { var pswpElement = document.querySelectorAll('.pswp')[0], gallery, options, items; items = parseThumbnailElements(galleryElement); // define options (if needed) options = { // define gallery index (for URL) galleryUID: galleryElement.getAttribute('data-pswp-uid'), getThumbBoundsFn: function(index) { // See Options -> getThumbBoundsFn section of documentation for more info var thumbnail = items[index].el.getElementsByTagName('img')[0], // find thumbnail pageYScroll = window.pageYOffset || document.documentElement.scrollTop, rect = thumbnail.getBoundingClientRect(); return {x:rect.left, y:rect.top + pageYScroll, w:rect.width}; } }; // PhotoSwipe opened from URL if(fromURL) { if(options.galleryPIDs) { // parse real index when custom PIDs are used // http://photoswipe.com/documentation/faq.html#custom-pid-in-url for(var j = 0; j < items.length; j++) { if(items[j].pid == index) { options.index = j; break; } } } else { // in URL indexes start from 1 options.index = parseInt(index, 10) - 1; } } else { options.index = parseInt(index, 10); } // exit if index not found if( isNaN(options.index) ) { return; } if(disableAnimation) { options.showAnimationDuration = 0; } // Pass data to PhotoSwipe and initialize it gallery = new PhotoSwipe( pswpElement, PhotoSwipeUI_Default, items, options); gallery.init(); }; // loop through all gallery elements and bind events var galleryElements = document.querySelectorAll( gallerySelector ); for(var i = 0, l = galleryElements.length; i < l; i++) { galleryElements[i].setAttribute('data-pswp-uid', i+1); galleryElements[i].onclick = onThumbnailsClick; } // Parse URL and open gallery if it contains #&pid=3&gid=1 var hashData = photoswipeParseHash(); if(hashData.pid && hashData.gid) { openPhotoSwipe( hashData.pid , galleryElements[ hashData.gid - 1 ], true, true ); } }; // execute above function initPhotoSwipeFromDOM('.my-gallery');