Template:UCL/WowJS

(function (global, factory) {

 if (typeof define === "function" && define.amd) {
   define(['module', 'exports'], factory);
 } else if (typeof exports !== "undefined") {
   factory(module, exports);
 } else {
   var mod = {
     exports: {}
   };
   factory(mod, mod.exports);
   global.WOW = mod.exports;
 }

})(this, function (module, exports) {

 'use strict';

 Object.defineProperty(exports, "__esModule", {
   value: true
 });

 var _class, _temp;

 function _classCallCheck(instance, Constructor) {
   if (!(instance instanceof Constructor)) {
     throw new TypeError("Cannot call a class as a function");
   }
 }

 var _createClass = 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);
     }
   }

   return function (Constructor, protoProps, staticProps) {
     if (protoProps) defineProperties(Constructor.prototype, protoProps);
     if (staticProps) defineProperties(Constructor, staticProps);
     return Constructor;
   };
 }();

 function isIn(needle, haystack) {
   return haystack.indexOf(needle) >= 0;
 }

 function extend(custom, defaults) {
   for (var key in defaults) {
     if (custom[key] == null) {
       var value = defaults[key];
       custom[key] = value;
     }
   }
   return custom;
 }

 function isMobile(agent) {
   return (/Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test(agent)
   );
 }

 function createEvent(event) {
   var bubble = arguments.length <= 1 || arguments[1] === undefined ? false : arguments[1];
   var cancel = arguments.length <= 2 || arguments[2] === undefined ? false : arguments[2];
   var detail = arguments.length <= 3 || arguments[3] === undefined ? null : arguments[3];

   var customEvent = void 0;
   if (document.createEvent != null) {
     // W3C DOM
     customEvent = document.createEvent('CustomEvent');
     customEvent.initCustomEvent(event, bubble, cancel, detail);
   } else if (document.createEventObject != null) {
     // IE DOM < 9
     customEvent = document.createEventObject();
     customEvent.eventType = event;
   } else {
     customEvent.eventName = event;
   }

   return customEvent;
 }

 function emitEvent(elem, event) {
   if (elem.dispatchEvent != null) {
     // W3C DOM
     elem.dispatchEvent(event);
   } else if (event in (elem != null)) {
     elem[event]();
   } else if ('on' + event in (elem != null)) {
     elem['on' + event]();
   }
 }

 function addEvent(elem, event, fn) {
   if (elem.addEventListener != null) {
     // W3C DOM
     elem.addEventListener(event, fn, false);
   } else if (elem.attachEvent != null) {
     // IE DOM
     elem.attachEvent('on' + event, fn);
   } else {
     // fallback
     elem[event] = fn;
   }
 }

 function removeEvent(elem, event, fn) {
   if (elem.removeEventListener != null) {
     // W3C DOM
     elem.removeEventListener(event, fn, false);
   } else if (elem.detachEvent != null) {
     // IE DOM
     elem.detachEvent('on' + event, fn);
   } else {
     // fallback
     delete elem[event];
   }
 }

 function getInnerHeight() {
   if ('innerHeight' in window) {
     return window.innerHeight;
   }

   return document.documentElement.clientHeight;
 }

 // Minimalistic WeakMap shim, just in case.
 var WeakMap = window.WeakMap || window.MozWeakMap || function () {
   function WeakMap() {
     _classCallCheck(this, WeakMap);

     this.keys = [];
     this.values = [];
   }

   _createClass(WeakMap, [{
     key: 'get',
     value: function get(key) {
       for (var i = 0; i < this.keys.length; i++) {
         var item = this.keys[i];
         if (item === key) {
           return this.values[i];
         }
       }
       return undefined;
     }
   }, {
     key: 'set',
     value: function set(key, value) {
       for (var i = 0; i < this.keys.length; i++) {
         var item = this.keys[i];
         if (item === key) {
           this.values[i] = value;
           return this;
         }
       }
       this.keys.push(key);
       this.values.push(value);
       return this;
     }
   }]);

   return WeakMap;
 }();

 // Dummy MutationObserver, to avoid raising exceptions.
 var MutationObserver = window.MutationObserver || window.WebkitMutationObserver || window.MozMutationObserver || (_temp = _class = function () {
   function MutationObserver() {
     _classCallCheck(this, MutationObserver);

     if (typeof console !== 'undefined' && console !== null) {
       console.warn('MutationObserver is not supported by your browser.');
       console.warn('WOW.js cannot detect dom mutations, please call .sync() after loading new content.');
     }
   }

   _createClass(MutationObserver, [{
     key: 'observe',
     value: function observe() {}
   }]);

   return MutationObserver;
 }(), _class.notSupported = true, _temp);

 // getComputedStyle shim, from http://stackoverflow.com/a/21797294
 var getComputedStyle = window.getComputedStyle || function getComputedStyle(el) {
   var getComputedStyleRX = /(\-([a-z]){1})/g;
   return {
     getPropertyValue: function getPropertyValue(prop) {
       if (prop === 'float') {
         prop = 'styleFloat';
       }
       if (getComputedStyleRX.test(prop)) {
         prop.replace(getComputedStyleRX, function (_, _char) {
           return _char.toUpperCase();
         });
       }
       var currentStyle = el.currentStyle;

       return (currentStyle != null ? currentStyle[prop] : void 0) || null;
     }
   };
 };

 var WOW = function () {
   function WOW() {
     var options = arguments.length <= 0 || arguments[0] === undefined ? {} : arguments[0];

     _classCallCheck(this, WOW);

     this.defaults = {
       boxClass: 'wow',
       animateClass: 'animated',
       offset: 0,
       mobile: true,
       live: true,
       callback: null,
       scrollContainer: null,
       resetAnimation: true
     };

     this.animate = function animateFactory() {
       if ('requestAnimationFrame' in window) {
         return function (callback) {
           return window.requestAnimationFrame(callback);
         };
       }
       return function (callback) {
         return callback();
       };
     }();

     this.vendors = ['moz', 'webkit'];

     this.start = this.start.bind(this);
     this.resetAnimation = this.resetAnimation.bind(this);
     this.scrollHandler = this.scrollHandler.bind(this);
     this.scrollCallback = this.scrollCallback.bind(this);
     this.scrolled = true;
     this.config = extend(options, this.defaults);
     if (options.scrollContainer != null) {
       this.config.scrollContainer = document.querySelector(options.scrollContainer);
     }
     // Map of elements to animation names:
     this.animationNameCache = new WeakMap();
     this.wowEvent = createEvent(this.config.boxClass);
   }

   _createClass(WOW, [{
     key: 'init',
     value: function init() {
       this.element = window.document.documentElement;
       if (isIn(document.readyState, ['interactive', 'complete'])) {
         this.start();
       } else {
         addEvent(document, 'DOMContentLoaded', this.start);
       }
       this.finished = [];
     }
   }, {
     key: 'start',
     value: function start() {
       var _this = this;

       this.stopped = false;
       this.boxes = [].slice.call(this.element.querySelectorAll('.' + this.config.boxClass));
       this.all = this.boxes.slice(0);
       if (this.boxes.length) {
         if (this.disabled()) {
           this.resetStyle();
         } else {
           for (var i = 0; i < this.boxes.length; i++) {
             var box = this.boxes[i];
             this.applyStyle(box, true);
           }
         }
       }
       if (!this.disabled()) {
         addEvent(this.config.scrollContainer || window, 'scroll', this.scrollHandler);
         addEvent(window, 'resize', this.scrollHandler);
         this.interval = setInterval(this.scrollCallback, 50);
       }
       if (this.config.live) {
         var mut = new MutationObserver(function (records) {
           for (var j = 0; j < records.length; j++) {
             var record = records[j];
             for (var k = 0; k < record.addedNodes.length; k++) {
               var node = record.addedNodes[k];
               _this.doSync(node);
             }
           }
           return undefined;
         });
         mut.observe(document.body, {
           childList: true,
           subtree: true
         });
       }
     }
   }, {
     key: 'stop',
     value: function stop() {
       this.stopped = true;
       removeEvent(this.config.scrollContainer || window, 'scroll', this.scrollHandler);
       removeEvent(window, 'resize', this.scrollHandler);
       if (this.interval != null) {
         clearInterval(this.interval);
       }
     }
   }, {
     key: 'sync',
     value: function sync() {
       if (MutationObserver.notSupported) {
         this.doSync(this.element);
       }
     }
   }, {
     key: 'doSync',
     value: function doSync(element) {
       if (typeof element === 'undefined' || element === null) {
         element = this.element;
       }
       if (element.nodeType !== 1) {
         return;
       }
       element = element.parentNode || element;
       var iterable = element.querySelectorAll('.' + this.config.boxClass);
       for (var i = 0; i < iterable.length; i++) {
         var box = iterable[i];
         if (!isIn(box, this.all)) {
           this.boxes.push(box);
           this.all.push(box);
           if (this.stopped || this.disabled()) {
             this.resetStyle();
           } else {
             this.applyStyle(box, true);
           }
           this.scrolled = true;
         }
       }
     }
   }, {
     key: 'show',
     value: function show(box) {
       this.applyStyle(box);
       box.className = box.className + ' ' + this.config.animateClass;
       if (this.config.callback != null) {
         this.config.callback(box);
       }
       emitEvent(box, this.wowEvent);

       if (this.config.resetAnimation) {
         addEvent(box, 'animationend', this.resetAnimation);
         addEvent(box, 'oanimationend', this.resetAnimation);
         addEvent(box, 'webkitAnimationEnd', this.resetAnimation);
         addEvent(box, 'MSAnimationEnd', this.resetAnimation);
       }

       return box;
     }
   }, {
     key: 'applyStyle',
     value: function applyStyle(box, hidden) {
       var _this2 = this;

       var duration = box.getAttribute('data-wow-duration');
       var delay = box.getAttribute('data-wow-delay');
       var iteration = box.getAttribute('data-wow-iteration');

       return this.animate(function () {
         return _this2.customStyle(box, hidden, duration, delay, iteration);
       });
     }
   }, {
     key: 'resetStyle',
     value: function resetStyle() {
       for (var i = 0; i < this.boxes.length; i++) {
         var box = this.boxes[i];
         box.style.visibility = 'visible';
       }
       return undefined;
     }
   }, {
     key: 'resetAnimation',
     value: function resetAnimation(event) {
       if (event.type.toLowerCase().indexOf('animationend') >= 0) {
         var target = event.target || event.srcElement;
         target.className = target.className.replace(this.config.animateClass, ).trim();
       }
     }
   }, {
     key: 'customStyle',
     value: function customStyle(box, hidden, duration, delay, iteration) {
       if (hidden) {
         this.cacheAnimationName(box);
       }
       box.style.visibility = hidden ? 'hidden' : 'visible';

       if (duration) {
         this.vendorSet(box.style, { animationDuration: duration });
       }
       if (delay) {
         this.vendorSet(box.style, { animationDelay: delay });
       }
       if (iteration) {
         this.vendorSet(box.style, { animationIterationCount: iteration });
       }
       this.vendorSet(box.style, { animationName: hidden ? 'none' : this.cachedAnimationName(box) });

       return box;
     }
   }, {
     key: 'vendorSet',
     value: function vendorSet(elem, properties) {
       for (var name in properties) {
         if (properties.hasOwnProperty(name)) {
           var value = properties[name];
           elem[ + name] = value;
           for (var i = 0; i < this.vendors.length; i++) {
             var vendor = this.vendors[i];
             elem[ + vendor + name.charAt(0).toUpperCase() + name.substr(1)] = value;
           }
         }
       }
     }
   }, {
     key: 'vendorCSS',
     value: function vendorCSS(elem, property) {
       var style = getComputedStyle(elem);
       var result = style.getPropertyCSSValue(property);
       for (var i = 0; i < this.vendors.length; i++) {
         var vendor = this.vendors[i];
         result = result || style.getPropertyCSSValue('-' + vendor + '-' + property);
       }
       return result;
     }
   }, {
     key: 'animationName',
     value: function animationName(box) {
       var aName = void 0;
       try {
         aName = this.vendorCSS(box, 'animation-name').cssText;
       } catch (error) {
         // Opera, fall back to plain property value
         aName = getComputedStyle(box).getPropertyValue('animation-name');
       }

       if (aName === 'none') {
         return ; // SVG/Firefox, unable to get animation name?
       }

       return aName;
     }
   }, {
     key: 'cacheAnimationName',
     value: function cacheAnimationName(box) {
       // https://bugzilla.mozilla.org/show_bug.cgi?id=921834
       // box.dataset is not supported for SVG elements in Firefox
       return this.animationNameCache.set(box, this.animationName(box));
     }
   }, {
     key: 'cachedAnimationName',
     value: function cachedAnimationName(box) {
       return this.animationNameCache.get(box);
     }
   }, {
     key: 'scrollHandler',
     value: function scrollHandler() {
       this.scrolled = true;
     }
   }, {
     key: 'scrollCallback',
     value: function scrollCallback() {
       if (this.scrolled) {
         this.scrolled = false;
         var results = [];
         for (var i = 0; i < this.boxes.length; i++) {
           var box = this.boxes[i];
           if (box) {
             if (this.isVisible(box)) {
               this.show(box);
               continue;
             }
             results.push(box);
           }
         }
         this.boxes = results;
         if (!this.boxes.length && !this.config.live) {
           this.stop();
         }
       }
     }
   }, {
     key: 'offsetTop',
     value: function offsetTop(element) {
       // SVG elements don't have an offsetTop in Firefox.
       // This will use their nearest parent that has an offsetTop.
       // Also, using ('offsetTop' of element) causes an exception in Firefox.
       while (element.offsetTop === undefined) {
         element = element.parentNode;
       }
       var top = element.offsetTop;
       while (element.offsetParent) {
         element = element.offsetParent;
         top += element.offsetTop;
       }
       return top;
     }
   }, {
     key: 'isVisible',
     value: function isVisible(box) {
       var offset = box.getAttribute('data-wow-offset') || this.config.offset;
       var viewTop = this.config.scrollContainer && this.config.scrollContainer.scrollTop || window.pageYOffset;
       var viewBottom = viewTop + Math.min(this.element.clientHeight, getInnerHeight()) - offset;
       var top = this.offsetTop(box);
       var bottom = top + box.clientHeight;

       return top <= viewBottom && bottom >= viewTop;
     }
   }, {
     key: 'disabled',
     value: function disabled() {
       return !this.config.mobile && isMobile(navigator.userAgent);
     }
   }]);

   return WOW;
 }();

 exports.default = WOW;
 module.exports = exports['default'];

});