docs/lib/wow/wow.js
/*
* WOW wow.js - v1.3.0 - 2016-10-04
* https://wowjs.uk
* Copyright (c) 2016 Thomas Grainger; Licensed MIT
*/
(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'];
});