common.js

var commonApp = function () {

  /**
   * 页面图片展示
   * @param gallerySelector string class类名
   * @private
   */
  var _initPhotoSwipeFromDOM = function(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];

        if(figureEl.nodeType !== 1) {
          continue;
        }

        linkEl = figureEl.children[0];

        size = linkEl.getAttribute('data-size').split('x');

        item = {
          src: linkEl.getAttribute('href'),
          //msrc:$(linkEl).find('img').attr('src'),
          w: parseInt(size[0], 10),
          h: parseInt(size[1], 10)
        };



        if(figureEl.children.length > 1) {
          item.title = figureEl.children[1].innerHTML;
        }

        if(linkEl.children.length > 0) {
          item.msrc = linkEl.children[0].getAttribute('src');
        }

        item.el = figureEl;
        items.push(item);
      }

      return items;
    };

    var closest = function closest(el, fn) {
      return el && ( fn(el) ? el : closest(el.parentNode, fn) );
    };

    var onThumbnailsClick = function(e) {
      e = e || window.event;
      e.preventDefault ? e.preventDefault() : e.returnValue = false;

      var eTarget = e.target || e.srcElement;

      var clickedListItem = closest(eTarget, function(el) {
        return (el.tagName && el.tagName.toUpperCase() === 'FIGURE');
      });

      if(!clickedListItem) {
        return;
      }
      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) {
        openPhotoSwipe( index, clickedGallery );
      }
      return false;
    };

    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);
      options = {
        shareEl:false,
        errorMsg:'<div class="pswp__error-msg">无法加载<a href="%url%" target="_blank">图片</a>。</div>',
        galleryUID: galleryElement.getAttribute('data-pswp-uid'),
        getThumbBoundsFn: function(index) {
          var thumbnail = items[index].el.getElementsByTagName('img')[0],
            pageYScroll = window.pageYOffset || document.documentElement.scrollTop,
            rect = thumbnail.getBoundingClientRect();

          return {x:rect.left, y:rect.top + pageYScroll, w:rect.width};
        }
      };

      if(fromURL) {
        if(options.galleryPIDs) {
          for(var j = 0; j < items.length; j++) {
            if(items[j].pid === index) {
              options.index = j;
              break;
            }
          }
        } else {
          options.index = parseInt(index, 10) - 1;
        }
      } else {
        options.index = parseInt(index, 10);
      }

      if( isNaN(options.index) ) {
        return;
      }

      if(disableAnimation) {
        options.showAnimationDuration = 0;
      }
      gallery = new PhotoSwipe( pswpElement, PhotoSwipeUI_Default, items, options);
      gallery.init();
    };

    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;
    }

    var hashData = photoswipeParseHash();
    if(hashData.pid && hashData.gid) {
      openPhotoSwipe( hashData.pid ,  galleryElements[ hashData.gid - 1 ], true, true );
    }
  };

  return {
    photoSwipeFromDom:_initPhotoSwipeFromDOM
  }
}();