diff --git a/bl-plugins/viewerjs/css/viewer.css b/bl-plugins/viewerjs/css/viewer.css
new file mode 100644
index 0000000..673ac06
--- /dev/null
+++ b/bl-plugins/viewerjs/css/viewer.css
@@ -0,0 +1,450 @@
+/*!
+ * Viewer.js v1.3.2
+ * https://fengyuanchen.github.io/viewerjs
+ *
+ * Copyright 2015-present Chen Fengyuan
+ * Released under the MIT license
+ *
+ * Date: 2019-01-24T11:01:30.299Z
+ */
+
+.viewer-zoom-in::before,
+.viewer-zoom-out::before,
+.viewer-one-to-one::before,
+.viewer-reset::before,
+.viewer-prev::before,
+.viewer-play::before,
+.viewer-next::before,
+.viewer-rotate-left::before,
+.viewer-rotate-right::before,
+.viewer-flip-horizontal::before,
+.viewer-flip-vertical::before,
+.viewer-fullscreen::before,
+.viewer-fullscreen-exit::before,
+.viewer-close::before {
+  background-image: url('data:image/png;base64,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');
+  background-repeat: no-repeat;
+  color: transparent;
+  display: block;
+  font-size: 0;
+  height: 20px;
+  line-height: 0;
+  width: 20px;
+}
+
+.viewer-zoom-in::before {
+  background-position: 0 0;
+  content: 'Zoom In';
+}
+
+.viewer-zoom-out::before {
+  background-position: -20px 0;
+  content: 'Zoom Out';
+}
+
+.viewer-one-to-one::before {
+  background-position: -40px 0;
+  content: 'One to One';
+}
+
+.viewer-reset::before {
+  background-position: -60px 0;
+  content: 'Reset';
+}
+
+.viewer-prev::before {
+  background-position: -80px 0;
+  content: 'Previous';
+}
+
+.viewer-play::before {
+  background-position: -100px 0;
+  content: 'Play';
+}
+
+.viewer-next::before {
+  background-position: -120px 0;
+  content: 'Next';
+}
+
+.viewer-rotate-left::before {
+  background-position: -140px 0;
+  content: 'Rotate Left';
+}
+
+.viewer-rotate-right::before {
+  background-position: -160px 0;
+  content: 'Rotate Right';
+}
+
+.viewer-flip-horizontal::before {
+  background-position: -180px 0;
+  content: 'Flip Horizontal';
+}
+
+.viewer-flip-vertical::before {
+  background-position: -200px 0;
+  content: 'Flip Vertical';
+}
+
+.viewer-fullscreen::before {
+  background-position: -220px 0;
+  content: 'Enter Full Screen';
+}
+
+.viewer-fullscreen-exit::before {
+  background-position: -240px 0;
+  content: 'Exit Full Screen';
+}
+
+.viewer-close::before {
+  background-position: -260px 0;
+  content: 'Close';
+}
+
+.viewer-container {
+  bottom: 0;
+  direction: ltr;
+  font-size: 0;
+  left: 0;
+  line-height: 0;
+  overflow: hidden;
+  position: absolute;
+  right: 0;
+  -webkit-tap-highlight-color: transparent;
+  top: 0;
+  -ms-touch-action: none;
+  touch-action: none;
+  -webkit-touch-callout: none;
+  -webkit-user-select: none;
+  -moz-user-select: none;
+  -ms-user-select: none;
+  user-select: none;
+}
+
+.viewer-container::selection,
+.viewer-container *::selection {
+  background-color: transparent;
+}
+
+.viewer-container img {
+  display: block;
+  height: auto;
+  max-height: none !important;
+  max-width: none !important;
+  min-height: 0 !important;
+  min-width: 0 !important;
+  width: 100%;
+}
+
+.viewer-canvas {
+  bottom: 0;
+  left: 0;
+  overflow: hidden;
+  position: absolute;
+  right: 0;
+  top: 0;
+}
+
+.viewer-canvas > img {
+  height: auto;
+  margin: 15px auto;
+  max-width: 90% !important;
+  width: auto;
+}
+
+.viewer-footer {
+  bottom: 0;
+  left: 0;
+  overflow: hidden;
+  position: absolute;
+  right: 0;
+  text-align: center;
+}
+
+.viewer-navbar {
+  background-color: rgba(0, 0, 0, 0.5);
+  overflow: hidden;
+}
+
+.viewer-list {
+  -webkit-box-sizing: content-box;
+  box-sizing: content-box;
+  height: 50px;
+  margin: 0;
+  overflow: hidden;
+  padding: 1px 0;
+}
+
+.viewer-list > li {
+  color: transparent;
+  cursor: pointer;
+  float: left;
+  font-size: 0;
+  height: 50px;
+  line-height: 0;
+  opacity: 0.5;
+  overflow: hidden;
+  -webkit-transition: opacity 0.15s;
+  transition: opacity 0.15s;
+  width: 30px;
+}
+
+.viewer-list > li:hover {
+  opacity: 0.75;
+}
+
+.viewer-list > li + li {
+  margin-left: 1px;
+}
+
+.viewer-list > .viewer-loading {
+  position: relative;
+}
+
+.viewer-list > .viewer-loading::after {
+  border-width: 2px;
+  height: 20px;
+  margin-left: -10px;
+  margin-top: -10px;
+  width: 20px;
+}
+
+.viewer-list > .viewer-active,
+.viewer-list > .viewer-active:hover {
+  opacity: 1;
+}
+
+.viewer-player {
+  background-color: #000;
+  bottom: 0;
+  cursor: none;
+  display: none;
+  left: 0;
+  position: absolute;
+  right: 0;
+  top: 0;
+}
+
+.viewer-player > img {
+  left: 0;
+  position: absolute;
+  top: 0;
+}
+
+.viewer-toolbar > ul {
+  display: inline-block;
+  margin: 0 auto 5px;
+  overflow: hidden;
+  padding: 3px 0;
+}
+
+.viewer-toolbar > ul > li {
+  background-color: rgba(0, 0, 0, 0.5);
+  border-radius: 50%;
+  cursor: pointer;
+  float: left;
+  height: 24px;
+  overflow: hidden;
+  -webkit-transition: background-color 0.15s;
+  transition: background-color 0.15s;
+  width: 24px;
+}
+
+.viewer-toolbar > ul > li:hover {
+  background-color: rgba(0, 0, 0, 0.8);
+}
+
+.viewer-toolbar > ul > li::before {
+  margin: 2px;
+}
+
+.viewer-toolbar > ul > li + li {
+  margin-left: 1px;
+}
+
+.viewer-toolbar > ul > .viewer-small {
+  height: 18px;
+  margin-bottom: 3px;
+  margin-top: 3px;
+  width: 18px;
+}
+
+.viewer-toolbar > ul > .viewer-small::before {
+  margin: -1px;
+}
+
+.viewer-toolbar > ul > .viewer-large {
+  height: 30px;
+  margin-bottom: -3px;
+  margin-top: -3px;
+  width: 30px;
+}
+
+.viewer-toolbar > ul > .viewer-large::before {
+  margin: 5px;
+}
+
+.viewer-tooltip {
+  background-color: rgba(0, 0, 0, 0.8);
+  border-radius: 10px;
+  color: #fff;
+  display: none;
+  font-size: 12px;
+  height: 20px;
+  left: 50%;
+  line-height: 20px;
+  margin-left: -25px;
+  margin-top: -10px;
+  position: absolute;
+  text-align: center;
+  top: 50%;
+  width: 50px;
+}
+
+.viewer-title {
+  color: #ccc;
+  display: inline-block;
+  font-size: 12px;
+  line-height: 1;
+  margin: 0 5% 5px;
+  max-width: 90%;
+  opacity: 0.8;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  -webkit-transition: opacity 0.15s;
+  transition: opacity 0.15s;
+  white-space: nowrap;
+}
+
+.viewer-title:hover {
+  opacity: 1;
+}
+
+.viewer-button {
+  background-color: rgba(0, 0, 0, 0.5);
+  border-radius: 50%;
+  cursor: pointer;
+  height: 80px;
+  overflow: hidden;
+  position: absolute;
+  right: -40px;
+  top: -40px;
+  -webkit-transition: background-color 0.15s;
+  transition: background-color 0.15s;
+  width: 80px;
+}
+
+.viewer-button:focus,
+.viewer-button:hover {
+  background-color: rgba(0, 0, 0, 0.8);
+}
+
+.viewer-button::before {
+  bottom: 15px;
+  left: 15px;
+  position: absolute;
+}
+
+.viewer-fixed {
+  position: fixed;
+}
+
+.viewer-open {
+  overflow: hidden;
+}
+
+.viewer-show {
+  display: block;
+}
+
+.viewer-hide {
+  display: none;
+}
+
+.viewer-backdrop {
+  background-color: rgba(0, 0, 0, 0.5);
+}
+
+.viewer-invisible {
+  visibility: hidden;
+}
+
+.viewer-move {
+  cursor: move;
+  cursor: -webkit-grab;
+  cursor: grab;
+}
+
+.viewer-fade {
+  opacity: 0;
+}
+
+.viewer-in {
+  opacity: 1;
+}
+
+.viewer-transition {
+  -webkit-transition: all 0.3s;
+  transition: all 0.3s;
+}
+
+@-webkit-keyframes viewer-spinner {
+  0% {
+    -webkit-transform: rotate(0deg);
+    transform: rotate(0deg);
+  }
+
+  100% {
+    -webkit-transform: rotate(360deg);
+    transform: rotate(360deg);
+  }
+}
+
+@keyframes viewer-spinner {
+  0% {
+    -webkit-transform: rotate(0deg);
+    transform: rotate(0deg);
+  }
+
+  100% {
+    -webkit-transform: rotate(360deg);
+    transform: rotate(360deg);
+  }
+}
+
+.viewer-loading::after {
+  -webkit-animation: viewer-spinner 1s linear infinite;
+  animation: viewer-spinner 1s linear infinite;
+  border: 4px solid rgba(255, 255, 255, 0.1);
+  border-left-color: rgba(255, 255, 255, 0.5);
+  border-radius: 50%;
+  content: '';
+  display: inline-block;
+  height: 40px;
+  left: 50%;
+  margin-left: -20px;
+  margin-top: -20px;
+  position: absolute;
+  top: 50%;
+  width: 40px;
+  z-index: 1;
+}
+
+@media (max-width: 767px) {
+  .viewer-hide-xs-down {
+    display: none;
+  }
+}
+
+@media (max-width: 991px) {
+  .viewer-hide-sm-down {
+    display: none;
+  }
+}
+
+@media (max-width: 1199px) {
+  .viewer-hide-md-down {
+    display: none;
+  }
+}
diff --git a/bl-plugins/viewerjs/js/viewer.js b/bl-plugins/viewerjs/js/viewer.js
new file mode 100644
index 0000000..68d1649
--- /dev/null
+++ b/bl-plugins/viewerjs/js/viewer.js
@@ -0,0 +1,3041 @@
+/*!
+ * Viewer.js v1.3.2
+ * https://fengyuanchen.github.io/viewerjs
+ *
+ * Copyright 2015-present Chen Fengyuan
+ * Released under the MIT license
+ *
+ * Date: 2019-01-24T11:01:33.473Z
+ */
+
+(function (global, factory) {
+  typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
+  typeof define === 'function' && define.amd ? define(factory) :
+  (global.Viewer = factory());
+}(this, (function () { 'use strict';
+
+  function _typeof(obj) {
+    if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") {
+      _typeof = function (obj) {
+        return typeof obj;
+      };
+    } else {
+      _typeof = function (obj) {
+        return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj;
+      };
+    }
+
+    return _typeof(obj);
+  }
+
+  function _classCallCheck(instance, Constructor) {
+    if (!(instance instanceof Constructor)) {
+      throw new TypeError("Cannot call a class as a function");
+    }
+  }
+
+  function _defineProperties(target, props) {
+    for (var i = 0; i < props.length; i++) {
+      var descriptor = props[i];
+      descriptor.enumerable = descriptor.enumerable || false;
+      descriptor.configurable = true;
+      if ("value" in descriptor) descriptor.writable = true;
+      Object.defineProperty(target, descriptor.key, descriptor);
+    }
+  }
+
+  function _createClass(Constructor, protoProps, staticProps) {
+    if (protoProps) _defineProperties(Constructor.prototype, protoProps);
+    if (staticProps) _defineProperties(Constructor, staticProps);
+    return Constructor;
+  }
+
+  var DEFAULTS = {
+    /**
+     * Enable a modal backdrop, specify `static` for a backdrop
+     * which doesn't close the modal on click.
+     * @type {boolean}
+     */
+    backdrop: true,
+
+    /**
+     * Show the button on the top-right of the viewer.
+     * @type {boolean}
+     */
+    button: true,
+
+    /**
+     * Show the navbar.
+     * @type {boolean | number}
+     */
+    navbar: true,
+
+    /**
+     * Specify the visibility and the content of the title.
+     * @type {boolean | number | Function | Array}
+     */
+    title: true,
+
+    /**
+     * Show the toolbar.
+     * @type {boolean | number | Object}
+     */
+    toolbar: true,
+
+    /**
+     * Custom class name(s) to add to the viewer's root element.
+     * @type {string}
+     */
+    className: '',
+
+    /**
+     * Define where to put the viewer in modal mode.
+     * @type {string | Element}
+     */
+    container: 'body',
+
+    /**
+     * Filter the images for viewing. Return true if the image is viewable.
+     * @type {Function}
+     */
+    filter: null,
+
+    /**
+     * Enable to request fullscreen when play.
+     * @type {boolean}
+     */
+    fullscreen: true,
+
+    /**
+     * Define the initial index of image for viewing.
+     * @type {number}
+     */
+    initialViewIndex: 0,
+
+    /**
+     * Enable inline mode.
+     * @type {boolean}
+     */
+    inline: false,
+
+    /**
+     * The amount of time to delay between automatically cycling an image when playing.
+     * @type {number}
+     */
+    interval: 5000,
+
+    /**
+     * Enable keyboard support.
+     * @type {boolean}
+     */
+    keyboard: true,
+
+    /**
+     * Indicate if show a loading spinner when load image or not.
+     * @type {boolean}
+     */
+    loading: true,
+
+    /**
+     * Indicate if enable loop viewing or not.
+     * @type {boolean}
+     */
+    loop: true,
+
+    /**
+     * Min width of the viewer in inline mode.
+     * @type {number}
+     */
+    minWidth: 200,
+
+    /**
+     * Min height of the viewer in inline mode.
+     * @type {number}
+     */
+    minHeight: 100,
+
+    /**
+     * Enable to move the image.
+     * @type {boolean}
+     */
+    movable: true,
+
+    /**
+     * Enable to zoom the image.
+     * @type {boolean}
+     */
+    zoomable: true,
+
+    /**
+     * Enable to rotate the image.
+     * @type {boolean}
+     */
+    rotatable: true,
+
+    /**
+     * Enable to scale the image.
+     * @type {boolean}
+     */
+    scalable: true,
+
+    /**
+     * Indicate if toggle the image size between its natural size
+     * and initial size when double click on the image or not.
+     * @type {boolean}
+     */
+    toggleOnDblclick: true,
+
+    /**
+     * Show the tooltip with image ratio (percentage) when zoom in or zoom out.
+     * @type {boolean}
+     */
+    tooltip: true,
+
+    /**
+     * Enable CSS3 Transition for some special elements.
+     * @type {boolean}
+     */
+    transition: true,
+
+    /**
+     * Define the CSS `z-index` value of viewer in modal mode.
+     * @type {number}
+     */
+    zIndex: 2015,
+
+    /**
+     * Define the CSS `z-index` value of viewer in inline mode.
+     * @type {number}
+     */
+    zIndexInline: 0,
+
+    /**
+     * Define the ratio when zoom the image by wheeling mouse.
+     * @type {number}
+     */
+    zoomRatio: 0.1,
+
+    /**
+     * Define the min ratio of the image when zoom out.
+     * @type {number}
+     */
+    minZoomRatio: 0.01,
+
+    /**
+     * Define the max ratio of the image when zoom in.
+     * @type {number}
+     */
+    maxZoomRatio: 100,
+
+    /**
+     * Define where to get the original image URL for viewing.
+     * @type {string | Function}
+     */
+    url: 'src',
+
+    /**
+     * Event shortcuts.
+     * @type {Function}
+     */
+    ready: null,
+    show: null,
+    shown: null,
+    hide: null,
+    hidden: null,
+    view: null,
+    viewed: null,
+    zoom: null,
+    zoomed: null
+  };
+
+  var TEMPLATE = '<div class="viewer-container" touch-action="none">' + '<div class="viewer-canvas"></div>' + '<div class="viewer-footer">' + '<div class="viewer-title"></div>' + '<div class="viewer-toolbar"></div>' + '<div class="viewer-navbar">' + '<ul class="viewer-list"></ul>' + '</div>' + '</div>' + '<div class="viewer-tooltip"></div>' + '<div role="button" class="viewer-button" data-viewer-action="mix"></div>' + '<div class="viewer-player"></div>' + '</div>';
+
+  var IS_BROWSER = typeof window !== 'undefined';
+  var WINDOW = IS_BROWSER ? window : {};
+  var IS_TOUCH_DEVICE = IS_BROWSER ? 'ontouchstart' in WINDOW.document.documentElement : false;
+  var HAS_POINTER_EVENT = IS_BROWSER ? 'PointerEvent' in WINDOW : false;
+  var NAMESPACE = 'viewer'; // Actions
+
+  var ACTION_MOVE = 'move';
+  var ACTION_SWITCH = 'switch';
+  var ACTION_ZOOM = 'zoom'; // Classes
+
+  var CLASS_ACTIVE = "".concat(NAMESPACE, "-active");
+  var CLASS_CLOSE = "".concat(NAMESPACE, "-close");
+  var CLASS_FADE = "".concat(NAMESPACE, "-fade");
+  var CLASS_FIXED = "".concat(NAMESPACE, "-fixed");
+  var CLASS_FULLSCREEN = "".concat(NAMESPACE, "-fullscreen");
+  var CLASS_FULLSCREEN_EXIT = "".concat(NAMESPACE, "-fullscreen-exit");
+  var CLASS_HIDE = "".concat(NAMESPACE, "-hide");
+  var CLASS_HIDE_MD_DOWN = "".concat(NAMESPACE, "-hide-md-down");
+  var CLASS_HIDE_SM_DOWN = "".concat(NAMESPACE, "-hide-sm-down");
+  var CLASS_HIDE_XS_DOWN = "".concat(NAMESPACE, "-hide-xs-down");
+  var CLASS_IN = "".concat(NAMESPACE, "-in");
+  var CLASS_INVISIBLE = "".concat(NAMESPACE, "-invisible");
+  var CLASS_LOADING = "".concat(NAMESPACE, "-loading");
+  var CLASS_MOVE = "".concat(NAMESPACE, "-move");
+  var CLASS_OPEN = "".concat(NAMESPACE, "-open");
+  var CLASS_SHOW = "".concat(NAMESPACE, "-show");
+  var CLASS_TRANSITION = "".concat(NAMESPACE, "-transition"); // Events
+
+  var EVENT_CLICK = 'click';
+  var EVENT_DBLCLICK = 'dblclick';
+  var EVENT_DRAG_START = 'dragstart';
+  var EVENT_HIDDEN = 'hidden';
+  var EVENT_HIDE = 'hide';
+  var EVENT_KEY_DOWN = 'keydown';
+  var EVENT_LOAD = 'load';
+  var EVENT_TOUCH_START = IS_TOUCH_DEVICE ? 'touchstart' : 'mousedown';
+  var EVENT_TOUCH_MOVE = IS_TOUCH_DEVICE ? 'touchmove' : 'mousemove';
+  var EVENT_TOUCH_END = IS_TOUCH_DEVICE ? 'touchend touchcancel' : 'mouseup';
+  var EVENT_POINTER_DOWN = HAS_POINTER_EVENT ? 'pointerdown' : EVENT_TOUCH_START;
+  var EVENT_POINTER_MOVE = HAS_POINTER_EVENT ? 'pointermove' : EVENT_TOUCH_MOVE;
+  var EVENT_POINTER_UP = HAS_POINTER_EVENT ? 'pointerup pointercancel' : EVENT_TOUCH_END;
+  var EVENT_READY = 'ready';
+  var EVENT_RESIZE = 'resize';
+  var EVENT_SHOW = 'show';
+  var EVENT_SHOWN = 'shown';
+  var EVENT_TRANSITION_END = 'transitionend';
+  var EVENT_VIEW = 'view';
+  var EVENT_VIEWED = 'viewed';
+  var EVENT_WHEEL = 'wheel';
+  var EVENT_ZOOM = 'zoom';
+  var EVENT_ZOOMED = 'zoomed'; // Data keys
+
+  var DATA_ACTION = "".concat(NAMESPACE, "Action"); // RegExps
+
+  var REGEXP_SPACES = /\s\s*/; // Misc
+
+  var BUTTONS = ['zoom-in', 'zoom-out', 'one-to-one', 'reset', 'prev', 'play', 'next', 'rotate-left', 'rotate-right', 'flip-horizontal', 'flip-vertical'];
+
+  /**
+   * Check if the given value is a string.
+   * @param {*} value - The value to check.
+   * @returns {boolean} Returns `true` if the given value is a string, else `false`.
+   */
+
+  function isString(value) {
+    return typeof value === 'string';
+  }
+  /**
+   * Check if the given value is not a number.
+   */
+
+  var isNaN = Number.isNaN || WINDOW.isNaN;
+  /**
+   * Check if the given value is a number.
+   * @param {*} value - The value to check.
+   * @returns {boolean} Returns `true` if the given value is a number, else `false`.
+   */
+
+  function isNumber(value) {
+    return typeof value === 'number' && !isNaN(value);
+  }
+  /**
+   * Check if the given value is undefined.
+   * @param {*} value - The value to check.
+   * @returns {boolean} Returns `true` if the given value is undefined, else `false`.
+   */
+
+  function isUndefined(value) {
+    return typeof value === 'undefined';
+  }
+  /**
+   * Check if the given value is an object.
+   * @param {*} value - The value to check.
+   * @returns {boolean} Returns `true` if the given value is an object, else `false`.
+   */
+
+  function isObject(value) {
+    return _typeof(value) === 'object' && value !== null;
+  }
+  var hasOwnProperty = Object.prototype.hasOwnProperty;
+  /**
+   * Check if the given value is a plain object.
+   * @param {*} value - The value to check.
+   * @returns {boolean} Returns `true` if the given value is a plain object, else `false`.
+   */
+
+  function isPlainObject(value) {
+    if (!isObject(value)) {
+      return false;
+    }
+
+    try {
+      var _constructor = value.constructor;
+      var prototype = _constructor.prototype;
+      return _constructor && prototype && hasOwnProperty.call(prototype, 'isPrototypeOf');
+    } catch (error) {
+      return false;
+    }
+  }
+  /**
+   * Check if the given value is a function.
+   * @param {*} value - The value to check.
+   * @returns {boolean} Returns `true` if the given value is a function, else `false`.
+   */
+
+  function isFunction(value) {
+    return typeof value === 'function';
+  }
+  /**
+   * Iterate the given data.
+   * @param {*} data - The data to iterate.
+   * @param {Function} callback - The process function for each element.
+   * @returns {*} The original data.
+   */
+
+  function forEach(data, callback) {
+    if (data && isFunction(callback)) {
+      if (Array.isArray(data) || isNumber(data.length)
+      /* array-like */
+      ) {
+          var length = data.length;
+          var i;
+
+          for (i = 0; i < length; i += 1) {
+            if (callback.call(data, data[i], i, data) === false) {
+              break;
+            }
+          }
+        } else if (isObject(data)) {
+        Object.keys(data).forEach(function (key) {
+          callback.call(data, data[key], key, data);
+        });
+      }
+    }
+
+    return data;
+  }
+  /**
+   * Extend the given object.
+   * @param {*} obj - The object to be extended.
+   * @param {*} args - The rest objects which will be merged to the first object.
+   * @returns {Object} The extended object.
+   */
+
+  var assign = Object.assign || function assign(obj) {
+    for (var _len = arguments.length, args = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
+      args[_key - 1] = arguments[_key];
+    }
+
+    if (isObject(obj) && args.length > 0) {
+      args.forEach(function (arg) {
+        if (isObject(arg)) {
+          Object.keys(arg).forEach(function (key) {
+            obj[key] = arg[key];
+          });
+        }
+      });
+    }
+
+    return obj;
+  };
+  var REGEXP_SUFFIX = /^(?:width|height|left|top|marginLeft|marginTop)$/;
+  /**
+   * Apply styles to the given element.
+   * @param {Element} element - The target element.
+   * @param {Object} styles - The styles for applying.
+   */
+
+  function setStyle(element, styles) {
+    var style = element.style;
+    forEach(styles, function (value, property) {
+      if (REGEXP_SUFFIX.test(property) && isNumber(value)) {
+        value += 'px';
+      }
+
+      style[property] = value;
+    });
+  }
+  /**
+   * Check if the given element has a special class.
+   * @param {Element} element - The element to check.
+   * @param {string} value - The class to search.
+   * @returns {boolean} Returns `true` if the special class was found.
+   */
+
+  function hasClass(element, value) {
+    return element.classList ? element.classList.contains(value) : element.className.indexOf(value) > -1;
+  }
+  /**
+   * Add classes to the given element.
+   * @param {Element} element - The target element.
+   * @param {string} value - The classes to be added.
+   */
+
+  function addClass(element, value) {
+    if (!value) {
+      return;
+    }
+
+    if (isNumber(element.length)) {
+      forEach(element, function (elem) {
+        addClass(elem, value);
+      });
+      return;
+    }
+
+    if (element.classList) {
+      element.classList.add(value);
+      return;
+    }
+
+    var className = element.className.trim();
+
+    if (!className) {
+      element.className = value;
+    } else if (className.indexOf(value) < 0) {
+      element.className = "".concat(className, " ").concat(value);
+    }
+  }
+  /**
+   * Remove classes from the given element.
+   * @param {Element} element - The target element.
+   * @param {string} value - The classes to be removed.
+   */
+
+  function removeClass(element, value) {
+    if (!value) {
+      return;
+    }
+
+    if (isNumber(element.length)) {
+      forEach(element, function (elem) {
+        removeClass(elem, value);
+      });
+      return;
+    }
+
+    if (element.classList) {
+      element.classList.remove(value);
+      return;
+    }
+
+    if (element.className.indexOf(value) >= 0) {
+      element.className = element.className.replace(value, '');
+    }
+  }
+  /**
+   * Add or remove classes from the given element.
+   * @param {Element} element - The target element.
+   * @param {string} value - The classes to be toggled.
+   * @param {boolean} added - Add only.
+   */
+
+  function toggleClass(element, value, added) {
+    if (!value) {
+      return;
+    }
+
+    if (isNumber(element.length)) {
+      forEach(element, function (elem) {
+        toggleClass(elem, value, added);
+      });
+      return;
+    } // IE10-11 doesn't support the second parameter of `classList.toggle`
+
+
+    if (added) {
+      addClass(element, value);
+    } else {
+      removeClass(element, value);
+    }
+  }
+  var REGEXP_HYPHENATE = /([a-z\d])([A-Z])/g;
+  /**
+   * Transform the given string from camelCase to kebab-case
+   * @param {string} value - The value to transform.
+   * @returns {string} The transformed value.
+   */
+
+  function hyphenate(value) {
+    return value.replace(REGEXP_HYPHENATE, '$1-$2').toLowerCase();
+  }
+  /**
+   * Get data from the given element.
+   * @param {Element} element - The target element.
+   * @param {string} name - The data key to get.
+   * @returns {string} The data value.
+   */
+
+  function getData(element, name) {
+    if (isObject(element[name])) {
+      return element[name];
+    }
+
+    if (element.dataset) {
+      return element.dataset[name];
+    }
+
+    return element.getAttribute("data-".concat(hyphenate(name)));
+  }
+  /**
+   * Set data to the given element.
+   * @param {Element} element - The target element.
+   * @param {string} name - The data key to set.
+   * @param {string} data - The data value.
+   */
+
+  function setData(element, name, data) {
+    if (isObject(data)) {
+      element[name] = data;
+    } else if (element.dataset) {
+      element.dataset[name] = data;
+    } else {
+      element.setAttribute("data-".concat(hyphenate(name)), data);
+    }
+  }
+
+  var onceSupported = function () {
+    var supported = false;
+
+    if (IS_BROWSER) {
+      var once = false;
+
+      var listener = function listener() {};
+
+      var options = Object.defineProperty({}, 'once', {
+        get: function get() {
+          supported = true;
+          return once;
+        },
+
+        /**
+         * This setter can fix a `TypeError` in strict mode
+         * {@link https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Errors/Getter_only}
+         * @param {boolean} value - The value to set
+         */
+        set: function set(value) {
+          once = value;
+        }
+      });
+      WINDOW.addEventListener('test', listener, options);
+      WINDOW.removeEventListener('test', listener, options);
+    }
+
+    return supported;
+  }();
+  /**
+   * Remove event listener from the target element.
+   * @param {Element} element - The event target.
+   * @param {string} type - The event type(s).
+   * @param {Function} listener - The event listener.
+   * @param {Object} options - The event options.
+   */
+
+
+  function removeListener(element, type, listener) {
+    var options = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : {};
+    var handler = listener;
+    type.trim().split(REGEXP_SPACES).forEach(function (event) {
+      if (!onceSupported) {
+        var listeners = element.listeners;
+
+        if (listeners && listeners[event] && listeners[event][listener]) {
+          handler = listeners[event][listener];
+          delete listeners[event][listener];
+
+          if (Object.keys(listeners[event]).length === 0) {
+            delete listeners[event];
+          }
+
+          if (Object.keys(listeners).length === 0) {
+            delete element.listeners;
+          }
+        }
+      }
+
+      element.removeEventListener(event, handler, options);
+    });
+  }
+  /**
+   * Add event listener to the target element.
+   * @param {Element} element - The event target.
+   * @param {string} type - The event type(s).
+   * @param {Function} listener - The event listener.
+   * @param {Object} options - The event options.
+   */
+
+  function addListener(element, type, listener) {
+    var options = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : {};
+    var _handler = listener;
+    type.trim().split(REGEXP_SPACES).forEach(function (event) {
+      if (options.once && !onceSupported) {
+        var _element$listeners = element.listeners,
+            listeners = _element$listeners === void 0 ? {} : _element$listeners;
+
+        _handler = function handler() {
+          delete listeners[event][listener];
+          element.removeEventListener(event, _handler, options);
+
+          for (var _len2 = arguments.length, args = new Array(_len2), _key2 = 0; _key2 < _len2; _key2++) {
+            args[_key2] = arguments[_key2];
+          }
+
+          listener.apply(element, args);
+        };
+
+        if (!listeners[event]) {
+          listeners[event] = {};
+        }
+
+        if (listeners[event][listener]) {
+          element.removeEventListener(event, listeners[event][listener], options);
+        }
+
+        listeners[event][listener] = _handler;
+        element.listeners = listeners;
+      }
+
+      element.addEventListener(event, _handler, options);
+    });
+  }
+  /**
+   * Dispatch event on the target element.
+   * @param {Element} element - The event target.
+   * @param {string} type - The event type(s).
+   * @param {Object} data - The additional event data.
+   * @returns {boolean} Indicate if the event is default prevented or not.
+   */
+
+  function dispatchEvent(element, type, data) {
+    var event; // Event and CustomEvent on IE9-11 are global objects, not constructors
+
+    if (isFunction(Event) && isFunction(CustomEvent)) {
+      event = new CustomEvent(type, {
+        detail: data,
+        bubbles: true,
+        cancelable: true
+      });
+    } else {
+      event = document.createEvent('CustomEvent');
+      event.initCustomEvent(type, true, true, data);
+    }
+
+    return element.dispatchEvent(event);
+  }
+  /**
+   * Get the offset base on the document.
+   * @param {Element} element - The target element.
+   * @returns {Object} The offset data.
+   */
+
+  function getOffset(element) {
+    var box = element.getBoundingClientRect();
+    return {
+      left: box.left + (window.pageXOffset - document.documentElement.clientLeft),
+      top: box.top + (window.pageYOffset - document.documentElement.clientTop)
+    };
+  }
+  /**
+   * Get transforms base on the given object.
+   * @param {Object} obj - The target object.
+   * @returns {string} A string contains transform values.
+   */
+
+  function getTransforms(_ref) {
+    var rotate = _ref.rotate,
+        scaleX = _ref.scaleX,
+        scaleY = _ref.scaleY,
+        translateX = _ref.translateX,
+        translateY = _ref.translateY;
+    var values = [];
+
+    if (isNumber(translateX) && translateX !== 0) {
+      values.push("translateX(".concat(translateX, "px)"));
+    }
+
+    if (isNumber(translateY) && translateY !== 0) {
+      values.push("translateY(".concat(translateY, "px)"));
+    } // Rotate should come first before scale to match orientation transform
+
+
+    if (isNumber(rotate) && rotate !== 0) {
+      values.push("rotate(".concat(rotate, "deg)"));
+    }
+
+    if (isNumber(scaleX) && scaleX !== 1) {
+      values.push("scaleX(".concat(scaleX, ")"));
+    }
+
+    if (isNumber(scaleY) && scaleY !== 1) {
+      values.push("scaleY(".concat(scaleY, ")"));
+    }
+
+    var transform = values.length ? values.join(' ') : 'none';
+    return {
+      WebkitTransform: transform,
+      msTransform: transform,
+      transform: transform
+    };
+  }
+  /**
+   * Get an image name from an image url.
+   * @param {string} url - The target url.
+   * @example
+   * // picture.jpg
+   * getImageNameFromURL('http://domain.com/path/to/picture.jpg?size=1280×960')
+   * @returns {string} A string contains the image name.
+   */
+
+  function getImageNameFromURL(url) {
+    return isString(url) ? url.replace(/^.*\//, '').replace(/[?&#].*$/, '') : '';
+  }
+  var IS_SAFARI = WINDOW.navigator && /(Macintosh|iPhone|iPod|iPad).*AppleWebKit/i.test(WINDOW.navigator.userAgent);
+  /**
+   * Get an image's natural sizes.
+   * @param {string} image - The target image.
+   * @param {Function} callback - The callback function.
+   * @returns {HTMLImageElement} The new image.
+   */
+
+  function getImageNaturalSizes(image, callback) {
+    var newImage = document.createElement('img'); // Modern browsers (except Safari)
+
+    if (image.naturalWidth && !IS_SAFARI) {
+      callback(image.naturalWidth, image.naturalHeight);
+      return newImage;
+    }
+
+    var body = document.body || document.documentElement;
+
+    newImage.onload = function () {
+      callback(newImage.width, newImage.height);
+
+      if (!IS_SAFARI) {
+        body.removeChild(newImage);
+      }
+    };
+
+    newImage.src = image.src; // iOS Safari will convert the image automatically
+    // with its orientation once append it into DOM
+
+    if (!IS_SAFARI) {
+      newImage.style.cssText = 'left:0;' + 'max-height:none!important;' + 'max-width:none!important;' + 'min-height:0!important;' + 'min-width:0!important;' + 'opacity:0;' + 'position:absolute;' + 'top:0;' + 'z-index:-1;';
+      body.appendChild(newImage);
+    }
+
+    return newImage;
+  }
+  /**
+   * Get the related class name of a responsive type number.
+   * @param {string} type - The responsive type.
+   * @returns {string} The related class name.
+   */
+
+  function getResponsiveClass(type) {
+    switch (type) {
+      case 2:
+        return CLASS_HIDE_XS_DOWN;
+
+      case 3:
+        return CLASS_HIDE_SM_DOWN;
+
+      case 4:
+        return CLASS_HIDE_MD_DOWN;
+
+      default:
+        return '';
+    }
+  }
+  /**
+   * Get the max ratio of a group of pointers.
+   * @param {string} pointers - The target pointers.
+   * @returns {number} The result ratio.
+   */
+
+  function getMaxZoomRatio(pointers) {
+    var pointers2 = assign({}, pointers);
+    var ratios = [];
+    forEach(pointers, function (pointer, pointerId) {
+      delete pointers2[pointerId];
+      forEach(pointers2, function (pointer2) {
+        var x1 = Math.abs(pointer.startX - pointer2.startX);
+        var y1 = Math.abs(pointer.startY - pointer2.startY);
+        var x2 = Math.abs(pointer.endX - pointer2.endX);
+        var y2 = Math.abs(pointer.endY - pointer2.endY);
+        var z1 = Math.sqrt(x1 * x1 + y1 * y1);
+        var z2 = Math.sqrt(x2 * x2 + y2 * y2);
+        var ratio = (z2 - z1) / z1;
+        ratios.push(ratio);
+      });
+    });
+    ratios.sort(function (a, b) {
+      return Math.abs(a) < Math.abs(b);
+    });
+    return ratios[0];
+  }
+  /**
+   * Get a pointer from an event object.
+   * @param {Object} event - The target event object.
+   * @param {boolean} endOnly - Indicates if only returns the end point coordinate or not.
+   * @returns {Object} The result pointer contains start and/or end point coordinates.
+   */
+
+  function getPointer(_ref2, endOnly) {
+    var pageX = _ref2.pageX,
+        pageY = _ref2.pageY;
+    var end = {
+      endX: pageX,
+      endY: pageY
+    };
+    return endOnly ? end : assign({
+      timeStamp: Date.now(),
+      startX: pageX,
+      startY: pageY
+    }, end);
+  }
+  /**
+   * Get the center point coordinate of a group of pointers.
+   * @param {Object} pointers - The target pointers.
+   * @returns {Object} The center point coordinate.
+   */
+
+  function getPointersCenter(pointers) {
+    var pageX = 0;
+    var pageY = 0;
+    var count = 0;
+    forEach(pointers, function (_ref3) {
+      var startX = _ref3.startX,
+          startY = _ref3.startY;
+      pageX += startX;
+      pageY += startY;
+      count += 1;
+    });
+    pageX /= count;
+    pageY /= count;
+    return {
+      pageX: pageX,
+      pageY: pageY
+    };
+  }
+
+  var render = {
+    render: function render() {
+      this.initContainer();
+      this.initViewer();
+      this.initList();
+      this.renderViewer();
+    },
+    initContainer: function initContainer() {
+      this.containerData = {
+        width: window.innerWidth,
+        height: window.innerHeight
+      };
+    },
+    initViewer: function initViewer() {
+      var options = this.options,
+          parent = this.parent;
+      var viewerData;
+
+      if (options.inline) {
+        viewerData = {
+          width: Math.max(parent.offsetWidth, options.minWidth),
+          height: Math.max(parent.offsetHeight, options.minHeight)
+        };
+        this.parentData = viewerData;
+      }
+
+      if (this.fulled || !viewerData) {
+        viewerData = this.containerData;
+      }
+
+      this.viewerData = assign({}, viewerData);
+    },
+    renderViewer: function renderViewer() {
+      if (this.options.inline && !this.fulled) {
+        setStyle(this.viewer, this.viewerData);
+      }
+    },
+    initList: function initList() {
+      var _this = this;
+
+      var element = this.element,
+          options = this.options,
+          list = this.list;
+      var items = [];
+      forEach(this.images, function (image, i) {
+        var src = image.src;
+        var alt = image.alt || getImageNameFromURL(src);
+        var url = options.url;
+
+        if (isString(url)) {
+          url = image.getAttribute(url);
+        } else if (isFunction(url)) {
+          url = url.call(_this, image);
+        }
+
+        if (src || url) {
+          items.push('<li>' + '<img' + " src=\"".concat(src || url, "\"") + ' role="button"' + ' data-viewer-action="view"' + " data-index=\"".concat(i, "\"") + " data-original-url=\"".concat(url || src, "\"") + " alt=\"".concat(alt, "\"") + '>' + '</li>');
+        }
+      });
+      list.innerHTML = items.join('');
+      this.items = list.getElementsByTagName('li');
+      forEach(this.items, function (item) {
+        var image = item.firstElementChild;
+        setData(image, 'filled', true);
+
+        if (options.loading) {
+          addClass(item, CLASS_LOADING);
+        }
+
+        addListener(image, EVENT_LOAD, function (event) {
+          if (options.loading) {
+            removeClass(item, CLASS_LOADING);
+          }
+
+          _this.loadImage(event);
+        }, {
+          once: true
+        });
+      });
+
+      if (options.transition) {
+        addListener(element, EVENT_VIEWED, function () {
+          addClass(list, CLASS_TRANSITION);
+        }, {
+          once: true
+        });
+      }
+    },
+    renderList: function renderList(index) {
+      var i = index || this.index;
+      var width = this.items[i].offsetWidth || 30;
+      var outerWidth = width + 1; // 1 pixel of `margin-left` width
+      // Place the active item in the center of the screen
+
+      setStyle(this.list, assign({
+        width: outerWidth * this.length
+      }, getTransforms({
+        translateX: (this.viewerData.width - width) / 2 - outerWidth * i
+      })));
+    },
+    resetList: function resetList() {
+      var list = this.list;
+      list.innerHTML = '';
+      removeClass(list, CLASS_TRANSITION);
+      setStyle(list, getTransforms({
+        translateX: 0
+      }));
+    },
+    initImage: function initImage(done) {
+      var _this2 = this;
+
+      var options = this.options,
+          image = this.image,
+          viewerData = this.viewerData;
+      var footerHeight = this.footer.offsetHeight;
+      var viewerWidth = viewerData.width;
+      var viewerHeight = Math.max(viewerData.height - footerHeight, footerHeight);
+      var oldImageData = this.imageData || {};
+      var sizingImage;
+      this.imageInitializing = {
+        abort: function abort() {
+          sizingImage.onload = null;
+        }
+      };
+      sizingImage = getImageNaturalSizes(image, function (naturalWidth, naturalHeight) {
+        var aspectRatio = naturalWidth / naturalHeight;
+        var width = viewerWidth;
+        var height = viewerHeight;
+        _this2.imageInitializing = false;
+
+        if (viewerHeight * aspectRatio > viewerWidth) {
+          height = viewerWidth / aspectRatio;
+        } else {
+          width = viewerHeight * aspectRatio;
+        }
+
+        width = Math.min(width * 0.9, naturalWidth);
+        height = Math.min(height * 0.9, naturalHeight);
+        var imageData = {
+          naturalWidth: naturalWidth,
+          naturalHeight: naturalHeight,
+          aspectRatio: aspectRatio,
+          ratio: width / naturalWidth,
+          width: width,
+          height: height,
+          left: (viewerWidth - width) / 2,
+          top: (viewerHeight - height) / 2
+        };
+        var initialImageData = assign({}, imageData);
+
+        if (options.rotatable) {
+          imageData.rotate = oldImageData.rotate || 0;
+          initialImageData.rotate = 0;
+        }
+
+        if (options.scalable) {
+          imageData.scaleX = oldImageData.scaleX || 1;
+          imageData.scaleY = oldImageData.scaleY || 1;
+          initialImageData.scaleX = 1;
+          initialImageData.scaleY = 1;
+        }
+
+        _this2.imageData = imageData;
+        _this2.initialImageData = initialImageData;
+
+        if (done) {
+          done();
+        }
+      });
+    },
+    renderImage: function renderImage(done) {
+      var _this3 = this;
+
+      var image = this.image,
+          imageData = this.imageData;
+      setStyle(image, assign({
+        width: imageData.width,
+        height: imageData.height,
+        // XXX: Not to use translateX/Y to avoid image shaking when zooming
+        marginLeft: imageData.left,
+        marginTop: imageData.top
+      }, getTransforms(imageData)));
+
+      if (done) {
+        if ((this.viewing || this.zooming) && this.options.transition) {
+          var onTransitionEnd = function onTransitionEnd() {
+            _this3.imageRendering = false;
+            done();
+          };
+
+          this.imageRendering = {
+            abort: function abort() {
+              removeListener(image, EVENT_TRANSITION_END, onTransitionEnd);
+            }
+          };
+          addListener(image, EVENT_TRANSITION_END, onTransitionEnd, {
+            once: true
+          });
+        } else {
+          done();
+        }
+      }
+    },
+    resetImage: function resetImage() {
+      // this.image only defined after viewed
+      if (this.viewing || this.viewed) {
+        var image = this.image;
+
+        if (this.viewing) {
+          this.viewing.abort();
+        }
+
+        image.parentNode.removeChild(image);
+        this.image = null;
+      }
+    }
+  };
+
+  var events = {
+    bind: function bind() {
+      var options = this.options,
+          viewer = this.viewer,
+          canvas = this.canvas;
+      var document = this.element.ownerDocument;
+      addListener(viewer, EVENT_CLICK, this.onClick = this.click.bind(this));
+      addListener(viewer, EVENT_WHEEL, this.onWheel = this.wheel.bind(this), {
+        passive: false,
+        capture: true
+      });
+      addListener(viewer, EVENT_DRAG_START, this.onDragStart = this.dragstart.bind(this));
+      addListener(canvas, EVENT_POINTER_DOWN, this.onPointerDown = this.pointerdown.bind(this));
+      addListener(document, EVENT_POINTER_MOVE, this.onPointerMove = this.pointermove.bind(this));
+      addListener(document, EVENT_POINTER_UP, this.onPointerUp = this.pointerup.bind(this));
+      addListener(document, EVENT_KEY_DOWN, this.onKeyDown = this.keydown.bind(this));
+      addListener(window, EVENT_RESIZE, this.onResize = this.resize.bind(this));
+
+      if (options.toggleOnDblclick) {
+        addListener(canvas, EVENT_DBLCLICK, this.onDblclick = this.dblclick.bind(this));
+      }
+    },
+    unbind: function unbind() {
+      var options = this.options,
+          viewer = this.viewer,
+          canvas = this.canvas;
+      var document = this.element.ownerDocument;
+      removeListener(viewer, EVENT_CLICK, this.onClick);
+      removeListener(viewer, EVENT_WHEEL, this.onWheel, {
+        passive: false,
+        capture: true
+      });
+      removeListener(viewer, EVENT_DRAG_START, this.onDragStart);
+      removeListener(canvas, EVENT_POINTER_DOWN, this.onPointerDown);
+      removeListener(document, EVENT_POINTER_MOVE, this.onPointerMove);
+      removeListener(document, EVENT_POINTER_UP, this.onPointerUp);
+      removeListener(document, EVENT_KEY_DOWN, this.onKeyDown);
+      removeListener(window, EVENT_RESIZE, this.onResize);
+
+      if (options.toggleOnDblclick) {
+        removeListener(canvas, EVENT_DBLCLICK, this.onDblclick);
+      }
+    }
+  };
+
+  var handlers = {
+    click: function click(event) {
+      var target = event.target;
+      var options = this.options,
+          imageData = this.imageData;
+      var action = getData(target, DATA_ACTION); // Cancel the emulated click when the native click event was triggered.
+
+      if (IS_TOUCH_DEVICE && event.isTrusted && target === this.canvas) {
+        clearTimeout(this.clickCanvasTimeout);
+      }
+
+      switch (action) {
+        case 'mix':
+          if (this.played) {
+            this.stop();
+          } else if (options.inline) {
+            if (this.fulled) {
+              this.exit();
+            } else {
+              this.full();
+            }
+          } else {
+            this.hide();
+          }
+
+          break;
+
+        case 'hide':
+          this.hide();
+          break;
+
+        case 'view':
+          this.view(getData(target, 'index'));
+          break;
+
+        case 'zoom-in':
+          this.zoom(0.1, true);
+          break;
+
+        case 'zoom-out':
+          this.zoom(-0.1, true);
+          break;
+
+        case 'one-to-one':
+          this.toggle();
+          break;
+
+        case 'reset':
+          this.reset();
+          break;
+
+        case 'prev':
+          this.prev(options.loop);
+          break;
+
+        case 'play':
+          this.play(options.fullscreen);
+          break;
+
+        case 'next':
+          this.next(options.loop);
+          break;
+
+        case 'rotate-left':
+          this.rotate(-90);
+          break;
+
+        case 'rotate-right':
+          this.rotate(90);
+          break;
+
+        case 'flip-horizontal':
+          this.scaleX(-imageData.scaleX || -1);
+          break;
+
+        case 'flip-vertical':
+          this.scaleY(-imageData.scaleY || -1);
+          break;
+
+        default:
+          if (this.played) {
+            this.stop();
+          }
+
+      }
+    },
+    dblclick: function dblclick(event) {
+      event.preventDefault();
+
+      if (this.viewed && event.target === this.image) {
+        // Cancel the emulated double click when the native dblclick event was triggered.
+        if (IS_TOUCH_DEVICE && event.isTrusted) {
+          clearTimeout(this.doubleClickImageTimeout);
+        }
+
+        this.toggle();
+      }
+    },
+    load: function load() {
+      var _this = this;
+
+      if (this.timeout) {
+        clearTimeout(this.timeout);
+        this.timeout = false;
+      }
+
+      var element = this.element,
+          options = this.options,
+          image = this.image,
+          index = this.index,
+          viewerData = this.viewerData;
+      removeClass(image, CLASS_INVISIBLE);
+
+      if (options.loading) {
+        removeClass(this.canvas, CLASS_LOADING);
+      }
+
+      image.style.cssText = 'height:0;' + "margin-left:".concat(viewerData.width / 2, "px;") + "margin-top:".concat(viewerData.height / 2, "px;") + 'max-width:none!important;' + 'position:absolute;' + 'width:0;';
+      this.initImage(function () {
+        toggleClass(image, CLASS_MOVE, options.movable);
+        toggleClass(image, CLASS_TRANSITION, options.transition);
+
+        _this.renderImage(function () {
+          _this.viewed = true;
+          _this.viewing = false;
+
+          if (isFunction(options.viewed)) {
+            addListener(element, EVENT_VIEWED, options.viewed, {
+              once: true
+            });
+          }
+
+          dispatchEvent(element, EVENT_VIEWED, {
+            originalImage: _this.images[index],
+            index: index,
+            image: image
+          });
+        });
+      });
+    },
+    loadImage: function loadImage(event) {
+      var image = event.target;
+      var parent = image.parentNode;
+      var parentWidth = parent.offsetWidth || 30;
+      var parentHeight = parent.offsetHeight || 50;
+      var filled = !!getData(image, 'filled');
+      getImageNaturalSizes(image, function (naturalWidth, naturalHeight) {
+        var aspectRatio = naturalWidth / naturalHeight;
+        var width = parentWidth;
+        var height = parentHeight;
+
+        if (parentHeight * aspectRatio > parentWidth) {
+          if (filled) {
+            width = parentHeight * aspectRatio;
+          } else {
+            height = parentWidth / aspectRatio;
+          }
+        } else if (filled) {
+          height = parentWidth / aspectRatio;
+        } else {
+          width = parentHeight * aspectRatio;
+        }
+
+        setStyle(image, assign({
+          width: width,
+          height: height
+        }, getTransforms({
+          translateX: (parentWidth - width) / 2,
+          translateY: (parentHeight - height) / 2
+        })));
+      });
+    },
+    keydown: function keydown(event) {
+      var options = this.options;
+
+      if (!this.fulled || !options.keyboard) {
+        return;
+      }
+
+      switch (event.keyCode || event.which || event.charCode) {
+        // Escape
+        case 27:
+          if (this.played) {
+            this.stop();
+          } else if (options.inline) {
+            if (this.fulled) {
+              this.exit();
+            }
+          } else {
+            this.hide();
+          }
+
+          break;
+        // Space
+
+        case 32:
+          if (this.played) {
+            this.stop();
+          }
+
+          break;
+        // ArrowLeft
+
+        case 37:
+          this.prev(options.loop);
+          break;
+        // ArrowUp
+
+        case 38:
+          // Prevent scroll on Firefox
+          event.preventDefault(); // Zoom in
+
+          this.zoom(options.zoomRatio, true);
+          break;
+        // ArrowRight
+
+        case 39:
+          this.next(options.loop);
+          break;
+        // ArrowDown
+
+        case 40:
+          // Prevent scroll on Firefox
+          event.preventDefault(); // Zoom out
+
+          this.zoom(-options.zoomRatio, true);
+          break;
+        // Ctrl + 0
+
+        case 48: // Fall through
+        // Ctrl + 1
+        // eslint-disable-next-line no-fallthrough
+
+        case 49:
+          if (event.ctrlKey) {
+            event.preventDefault();
+            this.toggle();
+          }
+
+          break;
+
+        default:
+      }
+    },
+    dragstart: function dragstart(event) {
+      if (event.target.tagName.toLowerCase() === 'img') {
+        event.preventDefault();
+      }
+    },
+    pointerdown: function pointerdown(event) {
+      var options = this.options,
+          pointers = this.pointers;
+      var buttons = event.buttons,
+          button = event.button;
+
+      if (!this.viewed || this.showing || this.viewing || this.hiding // No primary button (Usually the left button)
+      // Note that touch events have no `buttons` or `button` property
+      || isNumber(buttons) && buttons !== 1 || isNumber(button) && button !== 0 // Open context menu
+      || event.ctrlKey) {
+        return;
+      } // Prevent default behaviours as page zooming in touch devices.
+
+
+      event.preventDefault();
+
+      if (event.changedTouches) {
+        forEach(event.changedTouches, function (touch) {
+          pointers[touch.identifier] = getPointer(touch);
+        });
+      } else {
+        pointers[event.pointerId || 0] = getPointer(event);
+      }
+
+      var action = options.movable ? ACTION_MOVE : false;
+
+      if (Object.keys(pointers).length > 1) {
+        action = ACTION_ZOOM;
+      } else if ((event.pointerType === 'touch' || event.type === 'touchstart') && this.isSwitchable()) {
+        action = ACTION_SWITCH;
+      }
+
+      if (options.transition && (action === ACTION_MOVE || action === ACTION_ZOOM)) {
+        removeClass(this.image, CLASS_TRANSITION);
+      }
+
+      this.action = action;
+    },
+    pointermove: function pointermove(event) {
+      var pointers = this.pointers,
+          action = this.action;
+
+      if (!this.viewed || !action) {
+        return;
+      }
+
+      event.preventDefault();
+
+      if (event.changedTouches) {
+        forEach(event.changedTouches, function (touch) {
+          assign(pointers[touch.identifier] || {}, getPointer(touch, true));
+        });
+      } else {
+        assign(pointers[event.pointerId || 0] || {}, getPointer(event, true));
+      }
+
+      this.change(event);
+    },
+    pointerup: function pointerup(event) {
+      var _this2 = this;
+
+      var options = this.options,
+          action = this.action,
+          pointers = this.pointers;
+      var pointer;
+
+      if (event.changedTouches) {
+        forEach(event.changedTouches, function (touch) {
+          pointer = pointers[touch.identifier];
+          delete pointers[touch.identifier];
+        });
+      } else {
+        pointer = pointers[event.pointerId || 0];
+        delete pointers[event.pointerId || 0];
+      }
+
+      if (!action) {
+        return;
+      }
+
+      event.preventDefault();
+
+      if (options.transition && (action === ACTION_MOVE || action === ACTION_ZOOM)) {
+        addClass(this.image, CLASS_TRANSITION);
+      }
+
+      this.action = false; // Emulate click and double click in touch devices to support backdrop and image zooming (#210).
+
+      if (IS_TOUCH_DEVICE && action !== ACTION_ZOOM && pointer && Date.now() - pointer.timeStamp < 500) {
+        clearTimeout(this.clickCanvasTimeout);
+        clearTimeout(this.doubleClickImageTimeout);
+
+        if (options.toggleOnDblclick && this.viewed && event.target === this.image) {
+          if (this.imageClicked) {
+            this.imageClicked = false; // This timeout will be cleared later when a native dblclick event is triggering
+
+            this.doubleClickImageTimeout = setTimeout(function () {
+              dispatchEvent(_this2.image, EVENT_DBLCLICK);
+            }, 50);
+          } else {
+            this.imageClicked = true; // The default timing of a double click in Windows is 500 ms
+
+            this.doubleClickImageTimeout = setTimeout(function () {
+              _this2.imageClicked = false;
+            }, 500);
+          }
+        } else {
+          this.imageClicked = false;
+
+          if (options.backdrop && options.backdrop !== 'static' && event.target === this.canvas) {
+            // This timeout will be cleared later when a native click event is triggering
+            this.clickCanvasTimeout = setTimeout(function () {
+              dispatchEvent(_this2.canvas, EVENT_CLICK);
+            }, 50);
+          }
+        }
+      }
+    },
+    resize: function resize() {
+      var _this3 = this;
+
+      if (!this.isShown || this.hiding) {
+        return;
+      }
+
+      this.initContainer();
+      this.initViewer();
+      this.renderViewer();
+      this.renderList();
+
+      if (this.viewed) {
+        this.initImage(function () {
+          _this3.renderImage();
+        });
+      }
+
+      if (this.played) {
+        if (this.options.fullscreen && this.fulled && !(document.fullscreenElement || document.webkitFullscreenElement || document.mozFullScreenElement || document.msFullscreenElement)) {
+          this.stop();
+          return;
+        }
+
+        forEach(this.player.getElementsByTagName('img'), function (image) {
+          addListener(image, EVENT_LOAD, _this3.loadImage.bind(_this3), {
+            once: true
+          });
+          dispatchEvent(image, EVENT_LOAD);
+        });
+      }
+    },
+    wheel: function wheel(event) {
+      var _this4 = this;
+
+      if (!this.viewed) {
+        return;
+      }
+
+      event.preventDefault(); // Limit wheel speed to prevent zoom too fast
+
+      if (this.wheeling) {
+        return;
+      }
+
+      this.wheeling = true;
+      setTimeout(function () {
+        _this4.wheeling = false;
+      }, 50);
+      var ratio = Number(this.options.zoomRatio) || 0.1;
+      var delta = 1;
+
+      if (event.deltaY) {
+        delta = event.deltaY > 0 ? 1 : -1;
+      } else if (event.wheelDelta) {
+        delta = -event.wheelDelta / 120;
+      } else if (event.detail) {
+        delta = event.detail > 0 ? 1 : -1;
+      }
+
+      this.zoom(-delta * ratio, true, event);
+    }
+  };
+
+  var methods = {
+    /** Show the viewer (only available in modal mode)
+     * @param {boolean} [immediate=false] - Indicates if show the viewer immediately or not.
+     * @returns {Viewer} this
+     */
+    show: function show() {
+      var immediate = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : false;
+      var element = this.element,
+          options = this.options;
+
+      if (options.inline || this.showing || this.isShown || this.showing) {
+        return this;
+      }
+
+      if (!this.ready) {
+        this.build();
+
+        if (this.ready) {
+          this.show(immediate);
+        }
+
+        return this;
+      }
+
+      if (isFunction(options.show)) {
+        addListener(element, EVENT_SHOW, options.show, {
+          once: true
+        });
+      }
+
+      if (dispatchEvent(element, EVENT_SHOW) === false || !this.ready) {
+        return this;
+      }
+
+      if (this.hiding) {
+        this.transitioning.abort();
+      }
+
+      this.showing = true;
+      this.open();
+      var viewer = this.viewer;
+      removeClass(viewer, CLASS_HIDE);
+
+      if (options.transition && !immediate) {
+        var shown = this.shown.bind(this);
+        this.transitioning = {
+          abort: function abort() {
+            removeListener(viewer, EVENT_TRANSITION_END, shown);
+            removeClass(viewer, CLASS_IN);
+          }
+        };
+        addClass(viewer, CLASS_TRANSITION); // Force reflow to enable CSS3 transition
+        // eslint-disable-next-line
+
+        viewer.offsetWidth;
+        addListener(viewer, EVENT_TRANSITION_END, shown, {
+          once: true
+        });
+        addClass(viewer, CLASS_IN);
+      } else {
+        addClass(viewer, CLASS_IN);
+        this.shown();
+      }
+
+      return this;
+    },
+
+    /**
+     * Hide the viewer (only available in modal mode)
+     * @param {boolean} [immediate=false] - Indicates if hide the viewer immediately or not.
+     * @returns {Viewer} this
+     */
+    hide: function hide() {
+      var immediate = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : false;
+      var element = this.element,
+          options = this.options;
+
+      if (options.inline || this.hiding || !(this.isShown || this.showing)) {
+        return this;
+      }
+
+      if (isFunction(options.hide)) {
+        addListener(element, EVENT_HIDE, options.hide, {
+          once: true
+        });
+      }
+
+      if (dispatchEvent(element, EVENT_HIDE) === false) {
+        return this;
+      }
+
+      if (this.showing) {
+        this.transitioning.abort();
+      }
+
+      this.hiding = true;
+
+      if (this.played) {
+        this.stop();
+      } else if (this.viewing) {
+        this.viewing.abort();
+      }
+
+      var viewer = this.viewer;
+
+      if (options.transition && !immediate) {
+        var hidden = this.hidden.bind(this);
+
+        var hide = function hide() {
+          addListener(viewer, EVENT_TRANSITION_END, hidden, {
+            once: true
+          });
+          removeClass(viewer, CLASS_IN);
+        };
+
+        this.transitioning = {
+          abort: function abort() {
+            if (this.viewed) {
+              removeListener(this.image, EVENT_TRANSITION_END, hide);
+            } else {
+              removeListener(viewer, EVENT_TRANSITION_END, hidden);
+            }
+          }
+        };
+
+        if (this.viewed) {
+          addListener(this.image, EVENT_TRANSITION_END, hide, {
+            once: true
+          });
+          this.zoomTo(0, false, false, true);
+        } else {
+          hide();
+        }
+      } else {
+        removeClass(viewer, CLASS_IN);
+        this.hidden();
+      }
+
+      return this;
+    },
+
+    /**
+     * View one of the images with image's index
+     * @param {number} index - The index of the image to view.
+     * @returns {Viewer} this
+     */
+    view: function view() {
+      var _this = this;
+
+      var index = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : this.options.initialViewIndex;
+      index = Number(index) || 0;
+
+      if (!this.isShown) {
+        this.index = index;
+        return this.show();
+      }
+
+      if (this.hiding || this.played || index < 0 || index >= this.length || this.viewed && index === this.index) {
+        return this;
+      }
+
+      if (this.viewing) {
+        this.viewing.abort();
+      }
+
+      var element = this.element,
+          options = this.options,
+          title = this.title,
+          canvas = this.canvas;
+      var item = this.items[index];
+      var img = item.querySelector('img');
+      var url = getData(img, 'originalUrl');
+      var alt = img.getAttribute('alt');
+      var image = document.createElement('img');
+      image.src = url;
+      image.alt = alt;
+
+      if (isFunction(options.view)) {
+        addListener(element, EVENT_VIEW, options.view, {
+          once: true
+        });
+      }
+
+      if (dispatchEvent(element, EVENT_VIEW, {
+        originalImage: this.images[index],
+        index: index,
+        image: image
+      }) === false || !this.isShown || this.hiding || this.played) {
+        return this;
+      }
+
+      this.image = image;
+      removeClass(this.items[this.index], CLASS_ACTIVE);
+      addClass(item, CLASS_ACTIVE);
+      this.viewed = false;
+      this.index = index;
+      this.imageData = {};
+      addClass(image, CLASS_INVISIBLE);
+
+      if (options.loading) {
+        addClass(canvas, CLASS_LOADING);
+      }
+
+      canvas.innerHTML = '';
+      canvas.appendChild(image); // Center current item
+
+      this.renderList(); // Clear title
+
+      title.innerHTML = ''; // Generate title after viewed
+
+      var onViewed = function onViewed() {
+        var imageData = _this.imageData;
+        var render = Array.isArray(options.title) ? options.title[1] : options.title;
+        title.innerHTML = isFunction(render) ? render.call(_this, image, imageData) : "".concat(alt, " (").concat(imageData.naturalWidth, " \xD7 ").concat(imageData.naturalHeight, ")");
+      };
+
+      var onLoad;
+      addListener(element, EVENT_VIEWED, onViewed, {
+        once: true
+      });
+      this.viewing = {
+        abort: function abort() {
+          removeListener(element, EVENT_VIEWED, onViewed);
+
+          if (image.complete) {
+            if (this.imageRendering) {
+              this.imageRendering.abort();
+            } else if (this.imageInitializing) {
+              this.imageInitializing.abort();
+            }
+          } else {
+            removeListener(image, EVENT_LOAD, onLoad);
+
+            if (this.timeout) {
+              clearTimeout(this.timeout);
+            }
+          }
+        }
+      };
+
+      if (image.complete) {
+        this.load();
+      } else {
+        addListener(image, EVENT_LOAD, onLoad = this.load.bind(this), {
+          once: true
+        });
+
+        if (this.timeout) {
+          clearTimeout(this.timeout);
+        } // Make the image visible if it fails to load within 1s
+
+
+        this.timeout = setTimeout(function () {
+          removeClass(image, CLASS_INVISIBLE);
+          _this.timeout = false;
+        }, 1000);
+      }
+
+      return this;
+    },
+
+    /**
+     * View the previous image
+     * @param {boolean} [loop=false] - Indicate if view the last one
+     * when it is the first one at present.
+     * @returns {Viewer} this
+     */
+    prev: function prev() {
+      var loop = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : false;
+      var index = this.index - 1;
+
+      if (index < 0) {
+        index = loop ? this.length - 1 : 0;
+      }
+
+      this.view(index);
+      return this;
+    },
+
+    /**
+     * View the next image
+     * @param {boolean} [loop=false] - Indicate if view the first one
+     * when it is the last one at present.
+     * @returns {Viewer} this
+     */
+    next: function next() {
+      var loop = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : false;
+      var maxIndex = this.length - 1;
+      var index = this.index + 1;
+
+      if (index > maxIndex) {
+        index = loop ? 0 : maxIndex;
+      }
+
+      this.view(index);
+      return this;
+    },
+
+    /**
+     * Move the image with relative offsets.
+     * @param {number} offsetX - The relative offset distance on the x-axis.
+     * @param {number} offsetY - The relative offset distance on the y-axis.
+     * @returns {Viewer} this
+     */
+    move: function move(offsetX, offsetY) {
+      var imageData = this.imageData;
+      this.moveTo(isUndefined(offsetX) ? offsetX : imageData.left + Number(offsetX), isUndefined(offsetY) ? offsetY : imageData.top + Number(offsetY));
+      return this;
+    },
+
+    /**
+     * Move the image to an absolute point.
+     * @param {number} x - The x-axis coordinate.
+     * @param {number} [y=x] - The y-axis coordinate.
+     * @returns {Viewer} this
+     */
+    moveTo: function moveTo(x) {
+      var y = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : x;
+      var imageData = this.imageData;
+      x = Number(x);
+      y = Number(y);
+
+      if (this.viewed && !this.played && this.options.movable) {
+        var changed = false;
+
+        if (isNumber(x)) {
+          imageData.left = x;
+          changed = true;
+        }
+
+        if (isNumber(y)) {
+          imageData.top = y;
+          changed = true;
+        }
+
+        if (changed) {
+          this.renderImage();
+        }
+      }
+
+      return this;
+    },
+
+    /**
+     * Zoom the image with a relative ratio.
+     * @param {number} ratio - The target ratio.
+     * @param {boolean} [hasTooltip=false] - Indicates if it has a tooltip or not.
+     * @param {Event} [_originalEvent=null] - The original event if any.
+     * @returns {Viewer} this
+     */
+    zoom: function zoom(ratio) {
+      var hasTooltip = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : false;
+
+      var _originalEvent = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : null;
+
+      var imageData = this.imageData;
+      ratio = Number(ratio);
+
+      if (ratio < 0) {
+        ratio = 1 / (1 - ratio);
+      } else {
+        ratio = 1 + ratio;
+      }
+
+      this.zoomTo(imageData.width * ratio / imageData.naturalWidth, hasTooltip, _originalEvent);
+      return this;
+    },
+
+    /**
+     * Zoom the image to an absolute ratio.
+     * @param {number} ratio - The target ratio.
+     * @param {boolean} [hasTooltip=false] - Indicates if it has a tooltip or not.
+     * @param {Event} [_originalEvent=null] - The original event if any.
+     * @param {Event} [_zoomable=false] - Indicates if the current zoom is available or not.
+     * @returns {Viewer} this
+     */
+    zoomTo: function zoomTo(ratio) {
+      var _this2 = this;
+
+      var hasTooltip = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : false;
+
+      var _originalEvent = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : null;
+
+      var _zoomable = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : false;
+
+      var element = this.element,
+          options = this.options,
+          pointers = this.pointers,
+          imageData = this.imageData;
+      var width = imageData.width,
+          height = imageData.height,
+          left = imageData.left,
+          top = imageData.top,
+          naturalWidth = imageData.naturalWidth,
+          naturalHeight = imageData.naturalHeight;
+      ratio = Math.max(0, ratio);
+
+      if (isNumber(ratio) && this.viewed && !this.played && (_zoomable || options.zoomable)) {
+        if (!_zoomable) {
+          var minZoomRatio = Math.max(0.01, options.minZoomRatio);
+          var maxZoomRatio = Math.min(100, options.maxZoomRatio);
+          ratio = Math.min(Math.max(ratio, minZoomRatio), maxZoomRatio);
+        }
+
+        if (_originalEvent && ratio > 0.95 && ratio < 1.05) {
+          ratio = 1;
+        }
+
+        var newWidth = naturalWidth * ratio;
+        var newHeight = naturalHeight * ratio;
+        var offsetWidth = newWidth - width;
+        var offsetHeight = newHeight - height;
+        var oldRatio = width / naturalWidth;
+
+        if (isFunction(options.zoom)) {
+          addListener(element, EVENT_ZOOM, options.zoom, {
+            once: true
+          });
+        }
+
+        if (dispatchEvent(element, EVENT_ZOOM, {
+          ratio: ratio,
+          oldRatio: oldRatio,
+          originalEvent: _originalEvent
+        }) === false) {
+          return this;
+        }
+
+        this.zooming = true;
+
+        if (_originalEvent) {
+          var offset = getOffset(this.viewer);
+          var center = pointers && Object.keys(pointers).length ? getPointersCenter(pointers) : {
+            pageX: _originalEvent.pageX,
+            pageY: _originalEvent.pageY
+          }; // Zoom from the triggering point of the event
+
+          imageData.left -= offsetWidth * ((center.pageX - offset.left - left) / width);
+          imageData.top -= offsetHeight * ((center.pageY - offset.top - top) / height);
+        } else {
+          // Zoom from the center of the image
+          imageData.left -= offsetWidth / 2;
+          imageData.top -= offsetHeight / 2;
+        }
+
+        imageData.width = newWidth;
+        imageData.height = newHeight;
+        imageData.ratio = ratio;
+        this.renderImage(function () {
+          _this2.zooming = false;
+
+          if (isFunction(options.zoomed)) {
+            addListener(element, EVENT_ZOOMED, options.zoomed, {
+              once: true
+            });
+          }
+
+          dispatchEvent(element, EVENT_ZOOMED, {
+            ratio: ratio,
+            oldRatio: oldRatio,
+            originalEvent: _originalEvent
+          });
+        });
+
+        if (hasTooltip) {
+          this.tooltip();
+        }
+      }
+
+      return this;
+    },
+
+    /**
+     * Rotate the image with a relative degree.
+     * @param {number} degree - The rotate degree.
+     * @returns {Viewer} this
+     */
+    rotate: function rotate(degree) {
+      this.rotateTo((this.imageData.rotate || 0) + Number(degree));
+      return this;
+    },
+
+    /**
+     * Rotate the image to an absolute degree.
+     * @param {number} degree - The rotate degree.
+     * @returns {Viewer} this
+     */
+    rotateTo: function rotateTo(degree) {
+      var imageData = this.imageData;
+      degree = Number(degree);
+
+      if (isNumber(degree) && this.viewed && !this.played && this.options.rotatable) {
+        imageData.rotate = degree;
+        this.renderImage();
+      }
+
+      return this;
+    },
+
+    /**
+     * Scale the image on the x-axis.
+     * @param {number} scaleX - The scale ratio on the x-axis.
+     * @returns {Viewer} this
+     */
+    scaleX: function scaleX(_scaleX) {
+      this.scale(_scaleX, this.imageData.scaleY);
+      return this;
+    },
+
+    /**
+     * Scale the image on the y-axis.
+     * @param {number} scaleY - The scale ratio on the y-axis.
+     * @returns {Viewer} this
+     */
+    scaleY: function scaleY(_scaleY) {
+      this.scale(this.imageData.scaleX, _scaleY);
+      return this;
+    },
+
+    /**
+     * Scale the image.
+     * @param {number} scaleX - The scale ratio on the x-axis.
+     * @param {number} [scaleY=scaleX] - The scale ratio on the y-axis.
+     * @returns {Viewer} this
+     */
+    scale: function scale(scaleX) {
+      var scaleY = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : scaleX;
+      var imageData = this.imageData;
+      scaleX = Number(scaleX);
+      scaleY = Number(scaleY);
+
+      if (this.viewed && !this.played && this.options.scalable) {
+        var changed = false;
+
+        if (isNumber(scaleX)) {
+          imageData.scaleX = scaleX;
+          changed = true;
+        }
+
+        if (isNumber(scaleY)) {
+          imageData.scaleY = scaleY;
+          changed = true;
+        }
+
+        if (changed) {
+          this.renderImage();
+        }
+      }
+
+      return this;
+    },
+
+    /**
+     * Play the images
+     * @param {boolean} [fullscreen=false] - Indicate if request fullscreen or not.
+     * @returns {Viewer} this
+     */
+    play: function play() {
+      var _this3 = this;
+
+      var fullscreen = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : false;
+
+      if (!this.isShown || this.played) {
+        return this;
+      }
+
+      var options = this.options,
+          player = this.player;
+      var onLoad = this.loadImage.bind(this);
+      var list = [];
+      var total = 0;
+      var index = 0;
+      this.played = true;
+      this.onLoadWhenPlay = onLoad;
+
+      if (fullscreen) {
+        this.requestFullscreen();
+      }
+
+      addClass(player, CLASS_SHOW);
+      forEach(this.items, function (item, i) {
+        var img = item.querySelector('img');
+        var image = document.createElement('img');
+        image.src = getData(img, 'originalUrl');
+        image.alt = img.getAttribute('alt');
+        total += 1;
+        addClass(image, CLASS_FADE);
+        toggleClass(image, CLASS_TRANSITION, options.transition);
+
+        if (hasClass(item, CLASS_ACTIVE)) {
+          addClass(image, CLASS_IN);
+          index = i;
+        }
+
+        list.push(image);
+        addListener(image, EVENT_LOAD, onLoad, {
+          once: true
+        });
+        player.appendChild(image);
+      });
+
+      if (isNumber(options.interval) && options.interval > 0) {
+        var play = function play() {
+          _this3.playing = setTimeout(function () {
+            removeClass(list[index], CLASS_IN);
+            index += 1;
+            index = index < total ? index : 0;
+            addClass(list[index], CLASS_IN);
+            play();
+          }, options.interval);
+        };
+
+        if (total > 1) {
+          play();
+        }
+      }
+
+      return this;
+    },
+    // Stop play
+    stop: function stop() {
+      var _this4 = this;
+
+      if (!this.played) {
+        return this;
+      }
+
+      var player = this.player;
+      this.played = false;
+      clearTimeout(this.playing);
+      forEach(player.getElementsByTagName('img'), function (image) {
+        removeListener(image, EVENT_LOAD, _this4.onLoadWhenPlay);
+      });
+      removeClass(player, CLASS_SHOW);
+      player.innerHTML = '';
+      this.exitFullscreen();
+      return this;
+    },
+    // Enter modal mode (only available in inline mode)
+    full: function full() {
+      var _this5 = this;
+
+      var options = this.options,
+          viewer = this.viewer,
+          image = this.image,
+          list = this.list;
+
+      if (!this.isShown || this.played || this.fulled || !options.inline) {
+        return this;
+      }
+
+      this.fulled = true;
+      this.open();
+      addClass(this.button, CLASS_FULLSCREEN_EXIT);
+
+      if (options.transition) {
+        removeClass(list, CLASS_TRANSITION);
+
+        if (this.viewed) {
+          removeClass(image, CLASS_TRANSITION);
+        }
+      }
+
+      addClass(viewer, CLASS_FIXED);
+      viewer.setAttribute('style', '');
+      setStyle(viewer, {
+        zIndex: options.zIndex
+      });
+      this.initContainer();
+      this.viewerData = assign({}, this.containerData);
+      this.renderList();
+
+      if (this.viewed) {
+        this.initImage(function () {
+          _this5.renderImage(function () {
+            if (options.transition) {
+              setTimeout(function () {
+                addClass(image, CLASS_TRANSITION);
+                addClass(list, CLASS_TRANSITION);
+              }, 0);
+            }
+          });
+        });
+      }
+
+      return this;
+    },
+    // Exit modal mode (only available in inline mode)
+    exit: function exit() {
+      var _this6 = this;
+
+      var options = this.options,
+          viewer = this.viewer,
+          image = this.image,
+          list = this.list;
+
+      if (!this.isShown || this.played || !this.fulled || !options.inline) {
+        return this;
+      }
+
+      this.fulled = false;
+      this.close();
+      removeClass(this.button, CLASS_FULLSCREEN_EXIT);
+
+      if (options.transition) {
+        removeClass(list, CLASS_TRANSITION);
+
+        if (this.viewed) {
+          removeClass(image, CLASS_TRANSITION);
+        }
+      }
+
+      removeClass(viewer, CLASS_FIXED);
+      setStyle(viewer, {
+        zIndex: options.zIndexInline
+      });
+      this.viewerData = assign({}, this.parentData);
+      this.renderViewer();
+      this.renderList();
+
+      if (this.viewed) {
+        this.initImage(function () {
+          _this6.renderImage(function () {
+            if (options.transition) {
+              setTimeout(function () {
+                addClass(image, CLASS_TRANSITION);
+                addClass(list, CLASS_TRANSITION);
+              }, 0);
+            }
+          });
+        });
+      }
+
+      return this;
+    },
+    // Show the current ratio of the image with percentage
+    tooltip: function tooltip() {
+      var _this7 = this;
+
+      var options = this.options,
+          tooltipBox = this.tooltipBox,
+          imageData = this.imageData;
+
+      if (!this.viewed || this.played || !options.tooltip) {
+        return this;
+      }
+
+      tooltipBox.textContent = "".concat(Math.round(imageData.ratio * 100), "%");
+
+      if (!this.tooltipping) {
+        if (options.transition) {
+          if (this.fading) {
+            dispatchEvent(tooltipBox, EVENT_TRANSITION_END);
+          }
+
+          addClass(tooltipBox, CLASS_SHOW);
+          addClass(tooltipBox, CLASS_FADE);
+          addClass(tooltipBox, CLASS_TRANSITION); // Force reflow to enable CSS3 transition
+          // eslint-disable-next-line
+
+          tooltipBox.offsetWidth;
+          addClass(tooltipBox, CLASS_IN);
+        } else {
+          addClass(tooltipBox, CLASS_SHOW);
+        }
+      } else {
+        clearTimeout(this.tooltipping);
+      }
+
+      this.tooltipping = setTimeout(function () {
+        if (options.transition) {
+          addListener(tooltipBox, EVENT_TRANSITION_END, function () {
+            removeClass(tooltipBox, CLASS_SHOW);
+            removeClass(tooltipBox, CLASS_FADE);
+            removeClass(tooltipBox, CLASS_TRANSITION);
+            _this7.fading = false;
+          }, {
+            once: true
+          });
+          removeClass(tooltipBox, CLASS_IN);
+          _this7.fading = true;
+        } else {
+          removeClass(tooltipBox, CLASS_SHOW);
+        }
+
+        _this7.tooltipping = false;
+      }, 1000);
+      return this;
+    },
+    // Toggle the image size between its natural size and initial size
+    toggle: function toggle() {
+      if (this.imageData.ratio === 1) {
+        this.zoomTo(this.initialImageData.ratio, true);
+      } else {
+        this.zoomTo(1, true);
+      }
+
+      return this;
+    },
+    // Reset the image to its initial state
+    reset: function reset() {
+      if (this.viewed && !this.played) {
+        this.imageData = assign({}, this.initialImageData);
+        this.renderImage();
+      }
+
+      return this;
+    },
+    // Update viewer when images changed
+    update: function update() {
+      var element = this.element,
+          options = this.options,
+          isImg = this.isImg; // Destroy viewer if the target image was deleted
+
+      if (isImg && !element.parentNode) {
+        return this.destroy();
+      }
+
+      var images = [];
+      forEach(isImg ? [element] : element.querySelectorAll('img'), function (image) {
+        if (options.filter) {
+          if (options.filter(image)) {
+            images.push(image);
+          }
+        } else {
+          images.push(image);
+        }
+      });
+
+      if (!images.length) {
+        return this;
+      }
+
+      this.images = images;
+      this.length = images.length;
+
+      if (this.ready) {
+        var indexes = [];
+        forEach(this.items, function (item, i) {
+          var img = item.querySelector('img');
+          var image = images[i];
+
+          if (image) {
+            if (image.src !== img.src) {
+              indexes.push(i);
+            }
+          } else {
+            indexes.push(i);
+          }
+        });
+        setStyle(this.list, {
+          width: 'auto'
+        });
+        this.initList();
+
+        if (this.isShown) {
+          if (this.length) {
+            if (this.viewed) {
+              var index = indexes.indexOf(this.index);
+
+              if (index >= 0) {
+                this.viewed = false;
+                this.view(Math.max(this.index - (index + 1), 0));
+              } else {
+                addClass(this.items[this.index], CLASS_ACTIVE);
+              }
+            }
+          } else {
+            this.image = null;
+            this.viewed = false;
+            this.index = 0;
+            this.imageData = {};
+            this.canvas.innerHTML = '';
+            this.title.innerHTML = '';
+          }
+        }
+      } else {
+        this.build();
+      }
+
+      return this;
+    },
+    // Destroy the viewer
+    destroy: function destroy() {
+      var element = this.element,
+          options = this.options;
+
+      if (!element[NAMESPACE]) {
+        return this;
+      }
+
+      this.destroyed = true;
+
+      if (this.ready) {
+        if (this.played) {
+          this.stop();
+        }
+
+        if (options.inline) {
+          if (this.fulled) {
+            this.exit();
+          }
+
+          this.unbind();
+        } else if (this.isShown) {
+          if (this.viewing) {
+            if (this.imageRendering) {
+              this.imageRendering.abort();
+            } else if (this.imageInitializing) {
+              this.imageInitializing.abort();
+            }
+          }
+
+          if (this.hiding) {
+            this.transitioning.abort();
+          }
+
+          this.hidden();
+        } else if (this.showing) {
+          this.transitioning.abort();
+          this.hidden();
+        }
+
+        this.ready = false;
+        this.viewer.parentNode.removeChild(this.viewer);
+      } else if (options.inline) {
+        if (this.delaying) {
+          this.delaying.abort();
+        } else if (this.initializing) {
+          this.initializing.abort();
+        }
+      }
+
+      if (!options.inline) {
+        removeListener(element, EVENT_CLICK, this.onStart);
+      }
+
+      element[NAMESPACE] = undefined;
+      return this;
+    }
+  };
+
+  var others = {
+    open: function open() {
+      var body = this.body;
+      addClass(body, CLASS_OPEN);
+      body.style.paddingRight = "".concat(this.scrollbarWidth + (parseFloat(this.initialBodyPaddingRight) || 0), "px");
+    },
+    close: function close() {
+      var body = this.body;
+      removeClass(body, CLASS_OPEN);
+      body.style.paddingRight = this.initialBodyPaddingRight;
+    },
+    shown: function shown() {
+      var element = this.element,
+          options = this.options;
+      this.fulled = true;
+      this.isShown = true;
+      this.render();
+      this.bind();
+      this.showing = false;
+
+      if (isFunction(options.shown)) {
+        addListener(element, EVENT_SHOWN, options.shown, {
+          once: true
+        });
+      }
+
+      if (dispatchEvent(element, EVENT_SHOWN) === false) {
+        return;
+      }
+
+      if (this.ready && this.isShown && !this.hiding) {
+        this.view(this.index);
+      }
+    },
+    hidden: function hidden() {
+      var element = this.element,
+          options = this.options;
+      this.fulled = false;
+      this.viewed = false;
+      this.isShown = false;
+      this.close();
+      this.unbind();
+      addClass(this.viewer, CLASS_HIDE);
+      this.resetList();
+      this.resetImage();
+      this.hiding = false;
+
+      if (!this.destroyed) {
+        if (isFunction(options.hidden)) {
+          addListener(element, EVENT_HIDDEN, options.hidden, {
+            once: true
+          });
+        }
+
+        dispatchEvent(element, EVENT_HIDDEN);
+      }
+    },
+    requestFullscreen: function requestFullscreen() {
+      var document = this.element.ownerDocument;
+
+      if (this.fulled && !(document.fullscreenElement || document.webkitFullscreenElement || document.mozFullScreenElement || document.msFullscreenElement)) {
+        var documentElement = document.documentElement; // Element.requestFullscreen()
+
+        if (documentElement.requestFullscreen) {
+          documentElement.requestFullscreen();
+        } else if (documentElement.webkitRequestFullscreen) {
+          documentElement.webkitRequestFullscreen(Element.ALLOW_KEYBOARD_INPUT);
+        } else if (documentElement.mozRequestFullScreen) {
+          documentElement.mozRequestFullScreen();
+        } else if (documentElement.msRequestFullscreen) {
+          documentElement.msRequestFullscreen();
+        }
+      }
+    },
+    exitFullscreen: function exitFullscreen() {
+      var document = this.element.ownerDocument;
+
+      if (this.fulled && (document.fullscreenElement || document.webkitFullscreenElement || document.mozFullScreenElement || document.msFullscreenElement)) {
+        // Document.exitFullscreen()
+        if (document.exitFullscreen) {
+          document.exitFullscreen();
+        } else if (document.webkitExitFullscreen) {
+          document.webkitExitFullscreen();
+        } else if (document.mozCancelFullScreen) {
+          document.mozCancelFullScreen();
+        } else if (document.msExitFullscreen) {
+          document.msExitFullscreen();
+        }
+      }
+    },
+    change: function change(event) {
+      var options = this.options,
+          pointers = this.pointers;
+      var pointer = pointers[Object.keys(pointers)[0]];
+      var offsetX = pointer.endX - pointer.startX;
+      var offsetY = pointer.endY - pointer.startY;
+
+      switch (this.action) {
+        // Move the current image
+        case ACTION_MOVE:
+          this.move(offsetX, offsetY);
+          break;
+        // Zoom the current image
+
+        case ACTION_ZOOM:
+          this.zoom(getMaxZoomRatio(pointers), false, event);
+          break;
+
+        case ACTION_SWITCH:
+          {
+            this.action = 'switched';
+            var absoluteOffsetX = Math.abs(offsetX);
+
+            if (absoluteOffsetX > 1 && absoluteOffsetX > Math.abs(offsetY)) {
+              // Empty `pointers` as `touchend` event will not be fired after swiped in iOS browsers.
+              this.pointers = {};
+
+              if (offsetX > 1) {
+                this.prev(options.loop);
+              } else if (offsetX < -1) {
+                this.next(options.loop);
+              }
+            }
+
+            break;
+          }
+
+        default:
+      } // Override
+
+
+      forEach(pointers, function (p) {
+        p.startX = p.endX;
+        p.startY = p.endY;
+      });
+    },
+    isSwitchable: function isSwitchable() {
+      var imageData = this.imageData,
+          viewerData = this.viewerData;
+      return this.length > 1 && imageData.left >= 0 && imageData.top >= 0 && imageData.width <= viewerData.width && imageData.height <= viewerData.height;
+    }
+  };
+
+  var AnotherViewer = WINDOW.Viewer;
+
+  var Viewer =
+  /*#__PURE__*/
+  function () {
+    /**
+     * Create a new Viewer.
+     * @param {Element} element - The target element for viewing.
+     * @param {Object} [options={}] - The configuration options.
+     */
+    function Viewer(element) {
+      var options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};
+
+      _classCallCheck(this, Viewer);
+
+      if (!element || element.nodeType !== 1) {
+        throw new Error('The first argument is required and must be an element.');
+      }
+
+      this.element = element;
+      this.options = assign({}, DEFAULTS, isPlainObject(options) && options);
+      this.action = false;
+      this.fading = false;
+      this.fulled = false;
+      this.hiding = false;
+      this.imageClicked = false;
+      this.imageData = {};
+      this.index = this.options.initialViewIndex;
+      this.isImg = false;
+      this.isShown = false;
+      this.length = 0;
+      this.played = false;
+      this.playing = false;
+      this.pointers = {};
+      this.ready = false;
+      this.showing = false;
+      this.timeout = false;
+      this.tooltipping = false;
+      this.viewed = false;
+      this.viewing = false;
+      this.wheeling = false;
+      this.zooming = false;
+      this.init();
+    }
+
+    _createClass(Viewer, [{
+      key: "init",
+      value: function init() {
+        var _this = this;
+
+        var element = this.element,
+            options = this.options;
+
+        if (element[NAMESPACE]) {
+          return;
+        }
+
+        element[NAMESPACE] = this;
+        var isImg = element.tagName.toLowerCase() === 'img';
+        var images = [];
+        forEach(isImg ? [element] : element.querySelectorAll('img'), function (image) {
+          if (isFunction(options.filter)) {
+            if (options.filter.call(_this, image)) {
+              images.push(image);
+            }
+          } else {
+            images.push(image);
+          }
+        });
+        this.isImg = isImg;
+        this.length = images.length;
+        this.images = images;
+        var ownerDocument = element.ownerDocument;
+        var body = ownerDocument.body || ownerDocument.documentElement;
+        this.body = body;
+        this.scrollbarWidth = window.innerWidth - ownerDocument.documentElement.clientWidth;
+        this.initialBodyPaddingRight = window.getComputedStyle(body).paddingRight; // Override `transition` option if it is not supported
+
+        if (isUndefined(document.createElement(NAMESPACE).style.transition)) {
+          options.transition = false;
+        }
+
+        if (options.inline) {
+          var count = 0;
+
+          var progress = function progress() {
+            count += 1;
+
+            if (count === _this.length) {
+              var timeout;
+              _this.initializing = false;
+              _this.delaying = {
+                abort: function abort() {
+                  clearTimeout(timeout);
+                }
+              }; // build asynchronously to keep `this.viewer` is accessible in `ready` event handler.
+
+              timeout = setTimeout(function () {
+                _this.delaying = false;
+
+                _this.build();
+              }, 0);
+            }
+          };
+
+          this.initializing = {
+            abort: function abort() {
+              forEach(images, function (image) {
+                if (!image.complete) {
+                  removeListener(image, EVENT_LOAD, progress);
+                }
+              });
+            }
+          };
+          forEach(images, function (image) {
+            if (image.complete) {
+              progress();
+            } else {
+              addListener(image, EVENT_LOAD, progress, {
+                once: true
+              });
+            }
+          });
+        } else {
+          addListener(element, EVENT_CLICK, this.onStart = function (_ref) {
+            var target = _ref.target;
+
+            if (target.tagName.toLowerCase() === 'img' && (!isFunction(options.filter) || options.filter.call(_this, target))) {
+              _this.view(_this.images.indexOf(target));
+            }
+          });
+        }
+      }
+    }, {
+      key: "build",
+      value: function build() {
+        if (this.ready) {
+          return;
+        }
+
+        var element = this.element,
+            options = this.options;
+        var parent = element.parentNode;
+        var template = document.createElement('div');
+        template.innerHTML = TEMPLATE;
+        var viewer = template.querySelector(".".concat(NAMESPACE, "-container"));
+        var title = viewer.querySelector(".".concat(NAMESPACE, "-title"));
+        var toolbar = viewer.querySelector(".".concat(NAMESPACE, "-toolbar"));
+        var navbar = viewer.querySelector(".".concat(NAMESPACE, "-navbar"));
+        var button = viewer.querySelector(".".concat(NAMESPACE, "-button"));
+        var canvas = viewer.querySelector(".".concat(NAMESPACE, "-canvas"));
+        this.parent = parent;
+        this.viewer = viewer;
+        this.title = title;
+        this.toolbar = toolbar;
+        this.navbar = navbar;
+        this.button = button;
+        this.canvas = canvas;
+        this.footer = viewer.querySelector(".".concat(NAMESPACE, "-footer"));
+        this.tooltipBox = viewer.querySelector(".".concat(NAMESPACE, "-tooltip"));
+        this.player = viewer.querySelector(".".concat(NAMESPACE, "-player"));
+        this.list = viewer.querySelector(".".concat(NAMESPACE, "-list"));
+        addClass(title, !options.title ? CLASS_HIDE : getResponsiveClass(Array.isArray(options.title) ? options.title[0] : options.title));
+        addClass(navbar, !options.navbar ? CLASS_HIDE : getResponsiveClass(options.navbar));
+        toggleClass(button, CLASS_HIDE, !options.button);
+
+        if (options.backdrop) {
+          addClass(viewer, "".concat(NAMESPACE, "-backdrop"));
+
+          if (!options.inline && options.backdrop !== 'static') {
+            setData(canvas, DATA_ACTION, 'hide');
+          }
+        }
+
+        if (isString(options.className) && options.className) {
+          // In case there are multiple class names
+          options.className.split(REGEXP_SPACES).forEach(function (className) {
+            addClass(viewer, className);
+          });
+        }
+
+        if (options.toolbar) {
+          var list = document.createElement('ul');
+          var custom = isPlainObject(options.toolbar);
+          var zoomButtons = BUTTONS.slice(0, 3);
+          var rotateButtons = BUTTONS.slice(7, 9);
+          var scaleButtons = BUTTONS.slice(9);
+
+          if (!custom) {
+            addClass(toolbar, getResponsiveClass(options.toolbar));
+          }
+
+          forEach(custom ? options.toolbar : BUTTONS, function (value, index) {
+            var deep = custom && isPlainObject(value);
+            var name = custom ? hyphenate(index) : value;
+            var show = deep && !isUndefined(value.show) ? value.show : value;
+
+            if (!show || !options.zoomable && zoomButtons.indexOf(name) !== -1 || !options.rotatable && rotateButtons.indexOf(name) !== -1 || !options.scalable && scaleButtons.indexOf(name) !== -1) {
+              return;
+            }
+
+            var size = deep && !isUndefined(value.size) ? value.size : value;
+            var click = deep && !isUndefined(value.click) ? value.click : value;
+            var item = document.createElement('li');
+            item.setAttribute('role', 'button');
+            addClass(item, "".concat(NAMESPACE, "-").concat(name));
+
+            if (!isFunction(click)) {
+              setData(item, DATA_ACTION, name);
+            }
+
+            if (isNumber(show)) {
+              addClass(item, getResponsiveClass(show));
+            }
+
+            if (['small', 'large'].indexOf(size) !== -1) {
+              addClass(item, "".concat(NAMESPACE, "-").concat(size));
+            } else if (name === 'play') {
+              addClass(item, "".concat(NAMESPACE, "-large"));
+            }
+
+            if (isFunction(click)) {
+              addListener(item, EVENT_CLICK, click);
+            }
+
+            list.appendChild(item);
+          });
+          toolbar.appendChild(list);
+        } else {
+          addClass(toolbar, CLASS_HIDE);
+        }
+
+        if (!options.rotatable) {
+          var rotates = toolbar.querySelectorAll('li[class*="rotate"]');
+          addClass(rotates, CLASS_INVISIBLE);
+          forEach(rotates, function (rotate) {
+            toolbar.appendChild(rotate);
+          });
+        }
+
+        if (options.inline) {
+          addClass(button, CLASS_FULLSCREEN);
+          setStyle(viewer, {
+            zIndex: options.zIndexInline
+          });
+
+          if (window.getComputedStyle(parent).position === 'static') {
+            setStyle(parent, {
+              position: 'relative'
+            });
+          }
+
+          parent.insertBefore(viewer, element.nextSibling);
+        } else {
+          addClass(button, CLASS_CLOSE);
+          addClass(viewer, CLASS_FIXED);
+          addClass(viewer, CLASS_FADE);
+          addClass(viewer, CLASS_HIDE);
+          setStyle(viewer, {
+            zIndex: options.zIndex
+          });
+          var container = options.container;
+
+          if (isString(container)) {
+            container = element.ownerDocument.querySelector(container);
+          }
+
+          if (!container) {
+            container = this.body;
+          }
+
+          container.appendChild(viewer);
+        }
+
+        if (options.inline) {
+          this.render();
+          this.bind();
+          this.isShown = true;
+        }
+
+        this.ready = true;
+
+        if (isFunction(options.ready)) {
+          addListener(element, EVENT_READY, options.ready, {
+            once: true
+          });
+        }
+
+        if (dispatchEvent(element, EVENT_READY) === false) {
+          this.ready = false;
+          return;
+        }
+
+        if (this.ready && options.inline) {
+          this.view(this.index);
+        }
+      }
+      /**
+       * Get the no conflict viewer class.
+       * @returns {Viewer} The viewer class.
+       */
+
+    }], [{
+      key: "noConflict",
+      value: function noConflict() {
+        window.Viewer = AnotherViewer;
+        return Viewer;
+      }
+      /**
+       * Change the default options.
+       * @param {Object} options - The new default options.
+       */
+
+    }, {
+      key: "setDefaults",
+      value: function setDefaults(options) {
+        assign(DEFAULTS, isPlainObject(options) && options);
+      }
+    }]);
+
+    return Viewer;
+  }();
+
+  assign(Viewer.prototype, render, events, handlers, methods, others);
+
+  return Viewer;
+
+})));
+
+window.addEventListener('DOMContentLoaded', function () {
+  var galley = document.getElementById('page_content');
+  var viewer = new Viewer(galley, {
+      toolbar: {
+      oneToOne: true,
+
+      prev: function() {
+        viewer.prev(true);
+      },
+
+      play: true,
+
+      next: function() {
+        viewer.next(true);
+      },
+
+      download: false,
+    },
+  });
+});
\ No newline at end of file
diff --git a/bl-plugins/viewerjs/languages/en.json b/bl-plugins/viewerjs/languages/en.json
new file mode 100644
index 0000000..d309f7d
--- /dev/null
+++ b/bl-plugins/viewerjs/languages/en.json
@@ -0,0 +1,7 @@
+{
+	"plugin-data":
+	{
+		"name": "Viewer.js",
+		"description": "Page gallery based on the Viewer.js v1.3.2 by Fengyuan Chen (https://fengyuanchen.github.io/viewerjs/). "
+	}
+}
diff --git a/bl-plugins/viewerjs/metadata.json b/bl-plugins/viewerjs/metadata.json
new file mode 100644
index 0000000..8703bf8
--- /dev/null
+++ b/bl-plugins/viewerjs/metadata.json
@@ -0,0 +1,10 @@
+{
+	"author": "Ilya Leoshko",
+	"email": "",
+	"website": "https://fengyuanchen.github.io/viewerjs/",
+	"version": "1.0",
+	"releaseDate": "2019-01-24",
+	"license": "MIT",
+	"compatible": "2.x, 3.x",
+	"notes": "Page gallery based on the Viewer.js v1.3.2 by Fengyuan Chen"
+}
diff --git a/bl-plugins/viewerjs/plugin.php b/bl-plugins/viewerjs/plugin.php
new file mode 100644
index 0000000..c631a3c
--- /dev/null
+++ b/bl-plugins/viewerjs/plugin.php
@@ -0,0 +1,30 @@
+<?php
+
+class pluginViewerjs extends Plugin {
+
+	public function form()
+	{
+		global $Language;
+
+		$html  = '<div>';
+		$html .= '<p>Your content must have a parent element with id #page_content!</p><p>All pictures must be without links, the script finds all < img > in the parent element with id #page_content.</p>';
+		$html .= '</div>';
+
+		return $html;
+	}
+
+	public function siteHead(){
+
+		$html  = '<link href="'.HTML_PATH_PLUGINS.'viewerjs/css/viewer.css" rel="stylesheet">';
+		return $html;
+
+    }
+
+ 	public function siteBodyEnd()
+ 	{
+
+ 		$html  = PHP_EOL.'<script src="'.HTML_PATH_PLUGINS.'viewerjs/js/viewer.js"></script>'.PHP_EOL;
+ 		return $html;
+	}
+
+}