# Bootstrap Photo Swipe

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Pro Component

JavaScript image gallery for mobile and desktop, modular, framework independent.

## Initialization

### JS

In order to use this plugin on your page you will need to include the following scripts in the “Optional JS” area from the page’s footer:

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    <script src="../../../assets/js/plugins/photoswipe.min.js"></script>
    <script src="../../../assets/js/plugins/photoswipe-ui-default.min.js"></script>

## Example

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    // Products gallery

      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')[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 free 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 free/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');