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WOW.js
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WOW.js
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function isIn(needle, haystack) {
return haystack.indexOf(needle) >= 0;
}
function extend(custom, defaults) {
for (const key in defaults) {
if (custom[key] == null) {
const 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, bubble = false, cancel = false, detail = null) {
let customEvent;
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.
const WeakMap = window.WeakMap || window.MozWeakMap ||
class WeakMap {
constructor() {
this.keys = [];
this.values = [];
}
get(key) {
for (let i = 0; i < this.keys.length; i++) {
const item = this.keys[i];
if (item === key) {
return this.values[i];
}
}
return undefined;
}
set(key, value) {
for (let i = 0; i < this.keys.length; i++) {
const item = this.keys[i];
if (item === key) {
this.values[i] = value;
return this;
}
}
this.keys.push(key);
this.values.push(value);
return this;
}
};
// Dummy MutationObserver, to avoid raising exceptions.
const MutationObserver =
window.MutationObserver || window.WebkitMutationObserver ||
window.MozMutationObserver ||
class MutationObserver {
constructor() {
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.'
);
}
}
static notSupported = true;
observe() {}
};
// getComputedStyle shim, from http://stackoverflow.com/a/21797294
const getComputedStyle = window.getComputedStyle ||
function getComputedStyle(el) {
const getComputedStyleRX = /(\-([a-z]){1})/g;
return {
getPropertyValue(prop) {
if (prop === 'float') { prop = 'styleFloat'; }
if (getComputedStyleRX.test(prop)) {
prop.replace(getComputedStyleRX, (_, _char) => _char.toUpperCase());
}
const { currentStyle } = el;
return (currentStyle != null ? currentStyle[prop] : void 0) || null;
},
};
};
export default class WOW {
defaults = {
boxClass: 'wow',
animateClass: 'animated',
offset: 0,
mobile: true,
live: true,
callback: null,
scrollContainer: null,
resetAnimation: true,
};
constructor(options = {}) {
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);
}
init() {
this.element = window.document.documentElement;
if (isIn(document.readyState, ['interactive', 'complete'])) {
this.start();
} else {
addEvent(document, 'DOMContentLoaded', this.start);
}
this.finished = [];
}
start() {
this.stopped = false;
this.boxes = [].slice.call(this.element.querySelectorAll(`.${this.config.boxClass}`));
this.all = this.boxes.slice(0);
if (this.boxes.length) {
if (this.disabled()) {
this.resetStyle();
} else {
for (let i = 0; i < this.boxes.length; i++) {
const box = this.boxes[i];
this.applyStyle(box, true);
}
}
}
if (!this.disabled()) {
addEvent(this.config.scrollContainer || window, 'scroll', this.scrollHandler);
addEvent(window, 'resize', this.scrollHandler);
this.interval = setInterval(this.scrollCallback, 50);
}
if (this.config.live) {
const mut = new MutationObserver(records => {
for (let j = 0; j < records.length; j++) {
const record = records[j];
for (let k = 0; k < record.addedNodes.length; k++) {
const node = record.addedNodes[k];
this.doSync(node);
}
}
return undefined;
});
mut.observe(document.body, {
childList: true,
subtree: true,
});
}
}
// unbind the scroll event
stop() {
this.stopped = true;
removeEvent(this.config.scrollContainer || window, 'scroll', this.scrollHandler);
removeEvent(window, 'resize', this.scrollHandler);
if (this.interval != null) {
clearInterval(this.interval);
}
}
sync() {
if (MutationObserver.notSupported) {
this.doSync(this.element);
}
}
doSync(element) {
if (typeof element === 'undefined' || element === null) { ({ element } = this); }
if (element.nodeType !== 1) { return; }
element = element.parentNode || element;
const iterable = element.querySelectorAll(`.${this.config.boxClass}`);
for (let i = 0; i < iterable.length; i++) {
const 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;
}
}
}
// show box element
show(box) {
this.applyStyle(box);
box.className = `${box.className} ${this.config.animateClass}`;
if (this.config.callback != null) { this.config.callback(box); }
emitEvent(box, this.wowEvent);
if (this.config.resetAnimation) {
addEvent(box, 'animationend', this.resetAnimation);
addEvent(box, 'oanimationend', this.resetAnimation);
addEvent(box, 'webkitAnimationEnd', this.resetAnimation);
addEvent(box, 'MSAnimationEnd', this.resetAnimation);
}
return box;
}
applyStyle(box, hidden) {
const duration = box.getAttribute('data-wow-duration');
const delay = box.getAttribute('data-wow-delay');
const iteration = box.getAttribute('data-wow-iteration');
return this.animate(() => this.customStyle(box, hidden, duration, delay, iteration));
}
animate = (function animateFactory() {
if ('requestAnimationFrame' in window) {
return callback => window.requestAnimationFrame(callback);
}
return callback => callback();
}());
resetStyle() {
for (let i = 0; i < this.boxes.length; i++) {
const box = this.boxes[i];
box.style.visibility = 'visible';
}
return undefined;
}
resetAnimation(event) {
if (event.type.toLowerCase().indexOf('animationend') >= 0) {
const target = event.target || event.srcElement;
target.className = target.className.replace(this.config.animateClass, '').trim();
}
}
customStyle(box, hidden, duration, delay, iteration) {
if (hidden) { this.cacheAnimationName(box); }
box.style.visibility = hidden ? 'hidden' : 'visible';
if (duration) { this.vendorSet(box.style, { animationDuration: duration }); }
if (delay) { this.vendorSet(box.style, { animationDelay: delay }); }
if (iteration) { this.vendorSet(box.style, { animationIterationCount: iteration }); }
this.vendorSet(box.style, { animationName: hidden ? 'none' : this.cachedAnimationName(box) });
return box;
}
vendors = ['moz', 'webkit'];
vendorSet(elem, properties) {
for (const name in properties) {
if (properties.hasOwnProperty(name)) {
const value = properties[name];
elem[`${name}`] = value;
for (let i = 0; i < this.vendors.length; i++) {
const vendor = this.vendors[i];
elem[`${vendor}${name.charAt(0).toUpperCase()}${name.substr(1)}`] = value;
}
}
}
}
vendorCSS(elem, property) {
const style = getComputedStyle(elem);
let result = style.getPropertyCSSValue(property);
for (let i = 0; i < this.vendors.length; i++) {
const vendor = this.vendors[i];
result = result || style.getPropertyCSSValue(`-${vendor}-${property}`);
}
return result;
}
animationName(box) {
let aName;
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;
}
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));
}
cachedAnimationName(box) {
return this.animationNameCache.get(box);
}
// fast window.scroll callback
scrollHandler() {
this.scrolled = true;
}
scrollCallback() {
if (this.scrolled) {
this.scrolled = false;
const results = [];
for (let i = 0; i < this.boxes.length; i++) {
const 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();
}
}
}
// Calculate element offset top
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;
}
let top = element.offsetTop;
while (element.offsetParent) {
element = element.offsetParent;
top += element.offsetTop;
}
return top;
}
// check if box is visible
isVisible(box) {
const offset = box.getAttribute('data-wow-offset') || this.config.offset;
const viewTop = (
this.config.scrollContainer && this.config.scrollContainer.scrollTop
) || window.pageYOffset;
const viewBottom =
viewTop + Math.min(this.element.clientHeight, getInnerHeight()) - offset;
const top = this.offsetTop(box);
const bottom = top + box.clientHeight;
return top <= viewBottom && bottom >= viewTop;
}
disabled() {
return !this.config.mobile && isMobile(navigator.userAgent);
}
}