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layouts/bs4-default/_js/photoswipe.js

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+/*! PhotoSwipe
+* http://photoswipe.com
+* Copyright (c) 2017 Dmitry Semenov; */
+
+
+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]; // <figure> element
+
+					// include only element nodes
+					if(figureEl.nodeType !== 1) {
+							continue;
+					}
+
+					linkEl = figureEl.children[0]; // <a> 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) {
+							// <figcaption> content
+							item.title = figureEl.children[1].innerHTML;
+					}
+
+					if(linkEl.children.length > 0) {
+							// <img> 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-gallery')[0],
+					gallery,
+					options,
+					items;
+
+			items = parseThumbnailElements(galleryElement);
+
+			// define options (if needed)
+			options = {
+
+					// define gallery index (for URL)
+					galleryUID: galleryElement.getAttribute('data-pswp-uid'),
+
+
+			};
+
+			// 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 );
+	}
+};