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///// ///// ///// /////
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///// ///// ///// /////
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///// ///// ///// /////
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///// ///// ///// /////
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///// ///// /////
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///// ///// /////
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///// ///// ///// /////
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///// ///// ///// /////
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///// /////
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///// /////
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///// ///// ///// /////
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///// ///// ///// /////
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///// ///// ///// /////
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///// ///// ///// /////
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/**
|
|
|
* ScrollReveal
|
|
|
* ------------
|
|
|
* Version : 3.4.0
|
|
|
* Website : scrollrevealjs.org
|
|
|
* Repo : github.com/jlmakes/scrollreveal.js
|
|
|
* Author : Julian Lloyd (@jlmakes)
|
|
|
*/
|
|
|
|
|
|
;(function () {
|
|
|
'use strict'
|
|
|
|
|
|
var sr
|
|
|
var _requestAnimationFrame
|
|
|
|
|
|
function ScrollReveal (config) {
|
|
|
// Support instantiation without the `new` keyword.
|
|
|
if (typeof this === 'undefined' || Object.getPrototypeOf(this) !== ScrollReveal.prototype) {
|
|
|
return new ScrollReveal(config)
|
|
|
}
|
|
|
|
|
|
sr = this // Save reference to instance.
|
|
|
sr.version = '3.4.0'
|
|
|
sr.tools = new Tools() // *required utilities
|
|
|
|
|
|
if (sr.isSupported()) {
|
|
|
sr.tools.extend(sr.defaults, config || {})
|
|
|
|
|
|
sr.defaults.container = _resolveContainer(sr.defaults)
|
|
|
|
|
|
sr.store = {
|
|
|
elements: {},
|
|
|
containers: []
|
|
|
}
|
|
|
|
|
|
sr.sequences = {}
|
|
|
sr.history = []
|
|
|
sr.uid = 0
|
|
|
sr.initialized = false
|
|
|
} else if (typeof console !== 'undefined' && console !== null) {
|
|
|
// Note: IE9 only supports console if devtools are open.
|
|
|
console.log('ScrollReveal is not supported in this browser.')
|
|
|
}
|
|
|
|
|
|
return sr
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* Configuration
|
|
|
* -------------
|
|
|
* This object signature can be passed directly to the ScrollReveal constructor,
|
|
|
* or as the second argument of the `reveal()` method.
|
|
|
*/
|
|
|
|
|
|
ScrollReveal.prototype.defaults = {
|
|
|
// 'bottom', 'left', 'top', 'right'
|
|
|
origin: 'bottom',
|
|
|
|
|
|
// Can be any valid CSS distance, e.g. '5rem', '10%', '20vw', etc.
|
|
|
distance: '20px',
|
|
|
|
|
|
// Time in milliseconds.
|
|
|
duration: 500,
|
|
|
delay: 0,
|
|
|
|
|
|
// Starting angles in degrees, will transition from these values to 0 in all axes.
|
|
|
rotate: { x: 0, y: 0, z: 0 },
|
|
|
|
|
|
// Starting opacity value, before transitioning to the computed opacity.
|
|
|
opacity: 0,
|
|
|
|
|
|
// Starting scale value, will transition from this value to 1
|
|
|
scale: 0.9,
|
|
|
|
|
|
// Accepts any valid CSS easing, e.g. 'ease', 'ease-in-out', 'linear', etc.
|
|
|
easing: 'cubic-bezier(0.6, 0.2, 0.1, 1)',
|
|
|
|
|
|
// `<html>` is the default reveal container. You can pass either:
|
|
|
// DOM Node, e.g. document.querySelector('.fooContainer')
|
|
|
// Selector, e.g. '.fooContainer'
|
|
|
container: window.document.documentElement,
|
|
|
|
|
|
// true/false to control reveal animations on mobile.
|
|
|
mobile: true,
|
|
|
|
|
|
// true: reveals occur every time elements become visible
|
|
|
// false: reveals occur once as elements become visible
|
|
|
reset: false,
|
|
|
|
|
|
// 'always' — delay for all reveal animations
|
|
|
// 'once' — delay only the first time reveals occur
|
|
|
// 'onload' - delay only for animations triggered by first load
|
|
|
useDelay: 'always',
|
|
|
|
|
|
// Change when an element is considered in the viewport. The default value
|
|
|
// of 0.20 means 20% of an element must be visible for its reveal to occur.
|
|
|
viewFactor: 0.2,
|
|
|
|
|
|
// Pixel values that alter the container boundaries.
|
|
|
// e.g. Set `{ top: 48 }`, if you have a 48px tall fixed toolbar.
|
|
|
// --
|
|
|
// Visual Aid: https://scrollrevealjs.org/assets/viewoffset.png
|
|
|
viewOffset: { top: 0, right: 0, bottom: 0, left: 0 },
|
|
|
|
|
|
// Callbacks that fire for each triggered element reveal, and reset.
|
|
|
beforeReveal: function (domEl) {},
|
|
|
beforeReset: function (domEl) {},
|
|
|
|
|
|
// Callbacks that fire for each completed element reveal, and reset.
|
|
|
afterReveal: function (domEl) {},
|
|
|
afterReset: function (domEl) {}
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* Check if client supports CSS Transform and CSS Transition.
|
|
|
* @return {boolean}
|
|
|
*/
|
|
|
ScrollReveal.prototype.isSupported = function () {
|
|
|
var style = document.documentElement.style
|
|
|
return 'WebkitTransition' in style && 'WebkitTransform' in style ||
|
|
|
'transition' in style && 'transform' in style
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* Creates a reveal set, a group of elements that will animate when they
|
|
|
* become visible. If [interval] is provided, a new sequence is created
|
|
|
* that will ensure elements reveal in the order they appear in the DOM.
|
|
|
*
|
|
|
* @param {Node|NodeList|string} [target] The node, node list or selector to use for animation.
|
|
|
* @param {Object} [config] Override the defaults for this reveal set.
|
|
|
* @param {number} [interval] Time between sequenced element animations (milliseconds).
|
|
|
* @param {boolean} [sync] Used internally when updating reveals for async content.
|
|
|
*
|
|
|
* @return {Object} The current ScrollReveal instance.
|
|
|
*/
|
|
|
ScrollReveal.prototype.reveal = function (target, config, interval, sync) {
|
|
|
var container
|
|
|
var elements
|
|
|
var elem
|
|
|
var elemId
|
|
|
var sequence
|
|
|
var sequenceId
|
|
|
|
|
|
// No custom configuration was passed, but a sequence interval instead.
|
|
|
// let’s shuffle things around to make sure everything works.
|
|
|
if (config !== undefined && typeof config === 'number') {
|
|
|
interval = config
|
|
|
config = {}
|
|
|
} else if (config === undefined || config === null) {
|
|
|
config = {}
|
|
|
}
|
|
|
|
|
|
container = _resolveContainer(config)
|
|
|
elements = _getRevealElements(target, container)
|
|
|
|
|
|
if (!elements.length) {
|
|
|
console.log('ScrollReveal: reveal on "' + target + '" failed, no elements found.')
|
|
|
return sr
|
|
|
}
|
|
|
|
|
|
// Prepare a new sequence if an interval is passed.
|
|
|
if (interval && typeof interval === 'number') {
|
|
|
sequenceId = _nextUid()
|
|
|
|
|
|
sequence = sr.sequences[sequenceId] = {
|
|
|
id: sequenceId,
|
|
|
interval: interval,
|
|
|
elemIds: [],
|
|
|
active: false
|
|
|
}
|
|
|
}
|
|
|
|
|
|
// Begin main loop to configure ScrollReveal elements.
|
|
|
for (var i = 0; i < elements.length; i++) {
|
|
|
// Check if the element has already been configured and grab it from the store.
|
|
|
elemId = elements[i].getAttribute('data-sr-id')
|
|
|
if (elemId) {
|
|
|
elem = sr.store.elements[elemId]
|
|
|
} else {
|
|
|
// Otherwise, let’s do some basic setup.
|
|
|
elem = {
|
|
|
id: _nextUid(),
|
|
|
domEl: elements[i],
|
|
|
seen: false,
|
|
|
revealing: false
|
|
|
}
|
|
|
elem.domEl.setAttribute('data-sr-id', elem.id)
|
|
|
}
|
|
|
|
|
|
// Sequence only setup
|
|
|
if (sequence) {
|
|
|
elem.sequence = {
|
|
|
id: sequence.id,
|
|
|
index: sequence.elemIds.length
|
|
|
}
|
|
|
|
|
|
sequence.elemIds.push(elem.id)
|
|
|
}
|
|
|
|
|
|
// New or existing element, it’s time to update its configuration, styles,
|
|
|
// and send the updates to our store.
|
|
|
_configure(elem, config, container)
|
|
|
_style(elem)
|
|
|
_updateStore(elem)
|
|
|
|
|
|
// We need to make sure elements are set to visibility: visible, even when
|
|
|
// on mobile and `config.mobile === false`, or if unsupported.
|
|
|
if (sr.tools.isMobile() && !elem.config.mobile || !sr.isSupported()) {
|
|
|
elem.domEl.setAttribute('style', elem.styles.inline)
|
|
|
elem.disabled = true
|
|
|
} else if (!elem.revealing) {
|
|
|
// Otherwise, proceed normally.
|
|
|
elem.domEl.setAttribute('style',
|
|
|
elem.styles.inline +
|
|
|
elem.styles.transform.initial
|
|
|
)
|
|
|
}
|
|
|
}
|
|
|
|
|
|
// Each `reveal()` is recorded so that when calling `sync()` while working
|
|
|
// with asynchronously loaded content, it can re-trace your steps but with
|
|
|
// all your new elements now in the DOM.
|
|
|
|
|
|
// Since `reveal()` is called internally by `sync()`, we don’t want to
|
|
|
// record or intiialize each reveal during syncing.
|
|
|
if (!sync && sr.isSupported()) {
|
|
|
_record(target, config, interval)
|
|
|
|
|
|
// We push initialization to the event queue using setTimeout, so that we can
|
|
|
// give ScrollReveal room to process all reveal calls before putting things into motion.
|
|
|
// --
|
|
|
// Philip Roberts - What the heck is the event loop anyway? (JSConf EU 2014)
|
|
|
// https://www.youtube.com/watch?v=8aGhZQkoFbQ
|
|
|
if (sr.initTimeout) {
|
|
|
window.clearTimeout(sr.initTimeout)
|
|
|
}
|
|
|
sr.initTimeout = window.setTimeout(_init, 0)
|
|
|
}
|
|
|
|
|
|
return sr
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* Re-runs `reveal()` for each record stored in history, effectively capturing
|
|
|
* any content loaded asynchronously that matches existing reveal set targets.
|
|
|
* @return {Object} The current ScrollReveal instance.
|
|
|
*/
|
|
|
ScrollReveal.prototype.sync = function () {
|
|
|
if (sr.history.length && sr.isSupported()) {
|
|
|
for (var i = 0; i < sr.history.length; i++) {
|
|
|
var record = sr.history[i]
|
|
|
sr.reveal(record.target, record.config, record.interval, true)
|
|
|
}
|
|
|
_init()
|
|
|
} else {
|
|
|
console.log('ScrollReveal: sync failed, no reveals found.')
|
|
|
}
|
|
|
return sr
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* Private Methods
|
|
|
* ---------------
|
|
|
*/
|
|
|
|
|
|
function _resolveContainer (config) {
|
|
|
if (config && config.container) {
|
|
|
if (typeof config.container === 'string') {
|
|
|
return window.document.documentElement.querySelector(config.container)
|
|
|
} else if (sr.tools.isNode(config.container)) {
|
|
|
return config.container
|
|
|
} else {
|
|
|
console.log('ScrollReveal: invalid container "' + config.container + '" provided.')
|
|
|
console.log('ScrollReveal: falling back to default container.')
|
|
|
}
|
|
|
}
|
|
|
return sr.defaults.container
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* check to see if a node or node list was passed in as the target,
|
|
|
* otherwise query the container using target as a selector.
|
|
|
*
|
|
|
* @param {Node|NodeList|string} [target] client input for reveal target.
|
|
|
* @param {Node} [container] parent element for selector queries.
|
|
|
*
|
|
|
* @return {array} elements to be revealed.
|
|
|
*/
|
|
|
function _getRevealElements (target, container) {
|
|
|
if (typeof target === 'string') {
|
|
|
return Array.prototype.slice.call(container.querySelectorAll(target))
|
|
|
} else if (sr.tools.isNode(target)) {
|
|
|
return [target]
|
|
|
} else if (sr.tools.isNodeList(target)) {
|
|
|
return Array.prototype.slice.call(target)
|
|
|
} else if (Array.isArray(target)) {
|
|
|
return target.filter(sr.tools.isNode)
|
|
|
}
|
|
|
return []
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* A consistent way of creating unique IDs.
|
|
|
* @returns {number}
|
|
|
*/
|
|
|
function _nextUid () {
|
|
|
return ++sr.uid
|
|
|
}
|
|
|
|
|
|
function _configure (elem, config, container) {
|
|
|
// If a container was passed as a part of the config object,
|
|
|
// let’s overwrite it with the resolved container passed in.
|
|
|
if (config.container) config.container = container
|
|
|
// If the element hasn’t already been configured, let’s use a clone of the
|
|
|
// defaults extended by the configuration passed as the second argument.
|
|
|
if (!elem.config) {
|
|
|
elem.config = sr.tools.extendClone(sr.defaults, config)
|
|
|
} else {
|
|
|
// Otherwise, let’s use a clone of the existing element configuration extended
|
|
|
// by the configuration passed as the second argument.
|
|
|
elem.config = sr.tools.extendClone(elem.config, config)
|
|
|
}
|
|
|
|
|
|
// Infer CSS Transform axis from origin string.
|
|
|
if (elem.config.origin === 'top' || elem.config.origin === 'bottom') {
|
|
|
elem.config.axis = 'Y'
|
|
|
} else {
|
|
|
elem.config.axis = 'X'
|
|
|
}
|
|
|
}
|
|
|
|
|
|
function _style (elem) {
|
|
|
var computed = window.getComputedStyle(elem.domEl)
|
|
|
|
|
|
if (!elem.styles) {
|
|
|
elem.styles = {
|
|
|
transition: {},
|
|
|
transform: {},
|
|
|
computed: {}
|
|
|
}
|
|
|
|
|
|
// Capture any existing inline styles, and add our visibility override.
|
|
|
// --
|
|
|
// See section 4.2. in the Documentation:
|
|
|
// https://github.com/jlmakes/scrollreveal.js#42-improve-user-experience
|
|
|
elem.styles.inline = elem.domEl.getAttribute('style') || ''
|
|
|
elem.styles.inline += '; visibility: visible; '
|
|
|
|
|
|
// grab the elements existing opacity.
|
|
|
elem.styles.computed.opacity = computed.opacity
|
|
|
|
|
|
// grab the elements existing transitions.
|
|
|
if (!computed.transition || computed.transition === 'all 0s ease 0s') {
|
|
|
elem.styles.computed.transition = ''
|
|
|
} else {
|
|
|
elem.styles.computed.transition = computed.transition + ', '
|
|
|
}
|
|
|
}
|
|
|
|
|
|
// Create transition styles
|
|
|
elem.styles.transition.instant = _generateTransition(elem, 0)
|
|
|
elem.styles.transition.delayed = _generateTransition(elem, elem.config.delay)
|
|
|
|
|
|
// Generate transform styles, first with the webkit prefix.
|
|
|
elem.styles.transform.initial = ' -webkit-transform:'
|
|
|
elem.styles.transform.target = ' -webkit-transform:'
|
|
|
_generateTransform(elem)
|
|
|
|
|
|
// And again without any prefix.
|
|
|
elem.styles.transform.initial += 'transform:'
|
|
|
elem.styles.transform.target += 'transform:'
|
|
|
_generateTransform(elem)
|
|
|
}
|
|
|
|
|
|
function _generateTransition (elem, delay) {
|
|
|
var config = elem.config
|
|
|
|
|
|
return '-webkit-transition: ' + elem.styles.computed.transition +
|
|
|
'-webkit-transform ' + config.duration / 1000 + 's ' +
|
|
|
config.easing + ' ' +
|
|
|
delay / 1000 + 's, opacity ' +
|
|
|
config.duration / 1000 + 's ' +
|
|
|
config.easing + ' ' +
|
|
|
delay / 1000 + 's; ' +
|
|
|
|
|
|
'transition: ' + elem.styles.computed.transition +
|
|
|
'transform ' + config.duration / 1000 + 's ' +
|
|
|
config.easing + ' ' +
|
|
|
delay / 1000 + 's, opacity ' +
|
|
|
config.duration / 1000 + 's ' +
|
|
|
config.easing + ' ' +
|
|
|
delay / 1000 + 's; '
|
|
|
}
|
|
|
|
|
|
function _generateTransform (elem) {
|
|
|
var config = elem.config
|
|
|
var cssDistance
|
|
|
var transform = elem.styles.transform
|
|
|
|
|
|
// Let’s make sure our our pixel distances are negative for top and left.
|
|
|
// e.g. origin = 'top' and distance = '25px' starts at `top: -25px` in CSS.
|
|
|
if (config.origin === 'top' || config.origin === 'left') {
|
|
|
cssDistance = /^-/.test(config.distance)
|
|
|
? config.distance.substr(1)
|
|
|
: '-' + config.distance
|
|
|
} else {
|
|
|
cssDistance = config.distance
|
|
|
}
|
|
|
|
|
|
if (parseInt(config.distance)) {
|
|
|
transform.initial += ' translate' + config.axis + '(' + cssDistance + ')'
|
|
|
transform.target += ' translate' + config.axis + '(0)'
|
|
|
}
|
|
|
if (config.scale) {
|
|
|
transform.initial += ' scale(' + config.scale + ')'
|
|
|
transform.target += ' scale(1)'
|
|
|
}
|
|
|
if (config.rotate.x) {
|
|
|
transform.initial += ' rotateX(' + config.rotate.x + 'deg)'
|
|
|
transform.target += ' rotateX(0)'
|
|
|
}
|
|
|
if (config.rotate.y) {
|
|
|
transform.initial += ' rotateY(' + config.rotate.y + 'deg)'
|
|
|
transform.target += ' rotateY(0)'
|
|
|
}
|
|
|
if (config.rotate.z) {
|
|
|
transform.initial += ' rotateZ(' + config.rotate.z + 'deg)'
|
|
|
transform.target += ' rotateZ(0)'
|
|
|
}
|
|
|
transform.initial += '; opacity: ' + config.opacity + ';'
|
|
|
transform.target += '; opacity: ' + elem.styles.computed.opacity + ';'
|
|
|
}
|
|
|
|
|
|
function _updateStore (elem) {
|
|
|
var container = elem.config.container
|
|
|
|
|
|
// If this element’s container isn’t already in the store, let’s add it.
|
|
|
if (container && sr.store.containers.indexOf(container) === -1) {
|
|
|
sr.store.containers.push(elem.config.container)
|
|
|
}
|
|
|
|
|
|
// Update the element stored with our new element.
|
|
|
sr.store.elements[elem.id] = elem
|
|
|
}
|
|
|
|
|
|
function _record (target, config, interval) {
|
|
|
// Save the `reveal()` arguments that triggered this `_record()` call, so we
|
|
|
// can re-trace our steps when calling the `sync()` method.
|
|
|
var record = {
|
|
|
target: target,
|
|
|
config: config,
|
|
|
interval: interval
|
|
|
}
|
|
|
sr.history.push(record)
|
|
|
}
|
|
|
|
|
|
function _init () {
|
|
|
if (sr.isSupported()) {
|
|
|
// Initial animate call triggers valid reveal animations on first load.
|
|
|
// Subsequent animate calls are made inside the event handler.
|
|
|
_animate()
|
|
|
|
|
|
// Then we loop through all container nodes in the store and bind event
|
|
|
// listeners to each.
|
|
|
for (var i = 0; i < sr.store.containers.length; i++) {
|
|
|
sr.store.containers[i].addEventListener('scroll', _handler)
|
|
|
sr.store.containers[i].addEventListener('resize', _handler)
|
|
|
}
|
|
|
|
|
|
// Let’s also do a one-time binding of window event listeners.
|
|
|
if (!sr.initialized) {
|
|
|
window.addEventListener('scroll', _handler)
|
|
|
window.addEventListener('resize', _handler)
|
|
|
sr.initialized = true
|
|
|
}
|
|
|
}
|
|
|
return sr
|
|
|
}
|
|
|
|
|
|
function _handler () {
|
|
|
_requestAnimationFrame(_animate)
|
|
|
}
|
|
|
|
|
|
function _setActiveSequences () {
|
|
|
var active
|
|
|
var elem
|
|
|
var elemId
|
|
|
var sequence
|
|
|
|
|
|
// Loop through all sequences
|
|
|
sr.tools.forOwn(sr.sequences, function (sequenceId) {
|
|
|
sequence = sr.sequences[sequenceId]
|
|
|
active = false
|
|
|
|
|
|
// For each sequenced elemenet, let’s check visibility and if
|
|
|
// any are visible, set it’s sequence to active.
|
|
|
for (var i = 0; i < sequence.elemIds.length; i++) {
|
|
|
elemId = sequence.elemIds[i]
|
|
|
elem = sr.store.elements[elemId]
|
|
|
if (_isElemVisible(elem) && !active) {
|
|
|
active = true
|
|
|
}
|
|
|
}
|
|
|
|
|
|
sequence.active = active
|
|
|
})
|
|
|
}
|
|
|
|
|
|
function _animate () {
|
|
|
var delayed
|
|
|
var elem
|
|
|
|
|
|
_setActiveSequences()
|
|
|
|
|
|
// Loop through all elements in the store
|
|
|
sr.tools.forOwn(sr.store.elements, function (elemId) {
|
|
|
elem = sr.store.elements[elemId]
|
|
|
delayed = _shouldUseDelay(elem)
|
|
|
|
|
|
// Let’s see if we should revealand if so,
|
|
|
// trigger the `beforeReveal` callback and
|
|
|
// determine whether or not to use delay.
|
|
|
if (_shouldReveal(elem)) {
|
|
|
elem.config.beforeReveal(elem.domEl)
|
|
|
if (delayed) {
|
|
|
elem.domEl.setAttribute('style',
|
|
|
elem.styles.inline +
|
|
|
elem.styles.transform.target +
|
|
|
elem.styles.transition.delayed
|
|
|
)
|
|
|
} else {
|
|
|
elem.domEl.setAttribute('style',
|
|
|
elem.styles.inline +
|
|
|
elem.styles.transform.target +
|
|
|
elem.styles.transition.instant
|
|
|
)
|
|
|
}
|
|
|
|
|
|
// Let’s queue the `afterReveal` callback
|
|
|
// and mark the element as seen and revealing.
|
|
|
_queueCallback('reveal', elem, delayed)
|
|
|
elem.revealing = true
|
|
|
elem.seen = true
|
|
|
|
|
|
if (elem.sequence) {
|
|
|
_queueNextInSequence(elem, delayed)
|
|
|
}
|
|
|
} else if (_shouldReset(elem)) {
|
|
|
//Otherwise reset our element and
|
|
|
// trigger the `beforeReset` callback.
|
|
|
elem.config.beforeReset(elem.domEl)
|
|
|
elem.domEl.setAttribute('style',
|
|
|
elem.styles.inline +
|
|
|
elem.styles.transform.initial +
|
|
|
elem.styles.transition.instant
|
|
|
)
|
|
|
// And queue the `afterReset` callback.
|
|
|
_queueCallback('reset', elem)
|
|
|
elem.revealing = false
|
|
|
}
|
|
|
})
|
|
|
}
|
|
|
|
|
|
function _queueNextInSequence (elem, delayed) {
|
|
|
var elapsed = 0
|
|
|
var delay = 0
|
|
|
var sequence = sr.sequences[elem.sequence.id]
|
|
|
|
|
|
// We’re processing a sequenced element, so let's block other elements in this sequence.
|
|
|
sequence.blocked = true
|
|
|
|
|
|
// Since we’re triggering animations a part of a sequence after animations on first load,
|
|
|
// we need to check for that condition and explicitly add the delay to our timer.
|
|
|
if (delayed && elem.config.useDelay === 'onload') {
|
|
|
delay = elem.config.delay
|
|
|
}
|
|
|
|
|
|
// If a sequence timer is already running, capture the elapsed time and clear it.
|
|
|
if (elem.sequence.timer) {
|
|
|
elapsed = Math.abs(elem.sequence.timer.started - new Date())
|
|
|
window.clearTimeout(elem.sequence.timer)
|
|
|
}
|
|
|
|
|
|
// Start a new timer.
|
|
|
elem.sequence.timer = { started: new Date() }
|
|
|
elem.sequence.timer.clock = window.setTimeout(function () {
|
|
|
// Sequence interval has passed, so unblock the sequence and re-run the handler.
|
|
|
sequence.blocked = false
|
|
|
elem.sequence.timer = null
|
|
|
_handler()
|
|
|
}, Math.abs(sequence.interval) + delay - elapsed)
|
|
|
}
|
|
|
|
|
|
function _queueCallback (type, elem, delayed) {
|
|
|
var elapsed = 0
|
|
|
var duration = 0
|
|
|
var callback = 'after'
|
|
|
|
|
|
// Check which callback we’re working with.
|
|
|
switch (type) {
|
|
|
case 'reveal':
|
|
|
duration = elem.config.duration
|
|
|
if (delayed) {
|
|
|
duration += elem.config.delay
|
|
|
}
|
|
|
callback += 'Reveal'
|
|
|
break
|
|
|
|
|
|
case 'reset':
|
|
|
duration = elem.config.duration
|
|
|
callback += 'Reset'
|
|
|
break
|
|
|
}
|
|
|
|
|
|
// If a timer is already running, capture the elapsed time and clear it.
|
|
|
if (elem.timer) {
|
|
|
elapsed = Math.abs(elem.timer.started - new Date())
|
|
|
window.clearTimeout(elem.timer.clock)
|
|
|
}
|
|
|
|
|
|
// Start a new timer.
|
|
|
elem.timer = { started: new Date() }
|
|
|
elem.timer.clock = window.setTimeout(function () {
|
|
|
// The timer completed, so let’s fire the callback and null the timer.
|
|
|
elem.config[callback](elem.domEl)
|
|
|
elem.timer = null
|
|
|
}, duration - elapsed)
|
|
|
}
|
|
|
|
|
|
function _shouldReveal (elem) {
|
|
|
if (elem.sequence) {
|
|
|
var sequence = sr.sequences[elem.sequence.id]
|
|
|
return sequence.active &&
|
|
|
!sequence.blocked &&
|
|
|
!elem.revealing &&
|
|
|
!elem.disabled
|
|
|
}
|
|
|
return _isElemVisible(elem) &&
|
|
|
!elem.revealing &&
|
|
|
!elem.disabled
|
|
|
}
|
|
|
|
|
|
function _shouldUseDelay (elem) {
|
|
|
var config = elem.config.useDelay
|
|
|
return config === 'always' ||
|
|
|
(config === 'onload' && !sr.initialized) ||
|
|
|
(config === 'once' && !elem.seen)
|
|
|
}
|
|
|
|
|
|
function _shouldReset (elem) {
|
|
|
if (elem.sequence) {
|
|
|
var sequence = sr.sequences[elem.sequence.id]
|
|
|
return !sequence.active &&
|
|
|
elem.config.reset &&
|
|
|
elem.revealing &&
|
|
|
!elem.disabled
|
|
|
}
|
|
|
return !_isElemVisible(elem) &&
|
|
|
elem.config.reset &&
|
|
|
elem.revealing &&
|
|
|
!elem.disabled
|
|
|
}
|
|
|
|
|
|
function _getContainer (container) {
|
|
|
return {
|
|
|
width: container.clientWidth,
|
|
|
height: container.clientHeight
|
|
|
}
|
|
|
}
|
|
|
|
|
|
function _getScrolled (container) {
|
|
|
// Return the container scroll values, plus the its offset.
|
|
|
if (container && container !== window.document.documentElement) {
|
|
|
var offset = _getOffset(container)
|
|
|
return {
|
|
|
x: container.scrollLeft + offset.left,
|
|
|
y: container.scrollTop + offset.top
|
|
|
}
|
|
|
} else {
|
|
|
// Otherwise, default to the window object’s scroll values.
|
|
|
return {
|
|
|
x: window.pageXOffset,
|
|
|
y: window.pageYOffset
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
|
|
|
function _getOffset (domEl) {
|
|
|
var offsetTop = 0
|
|
|
var offsetLeft = 0
|
|
|
|
|
|
// Grab the element’s dimensions.
|
|
|
var offsetHeight = domEl.offsetHeight
|
|
|
var offsetWidth = domEl.offsetWidth
|
|
|
|
|
|
// Now calculate the distance between the element and its parent, then
|
|
|
// again for the parent to its parent, and again etc... until we have the
|
|
|
// total distance of the element to the document’s top and left origin.
|
|
|
do {
|
|
|
if (!isNaN(domEl.offsetTop)) {
|
|
|
offsetTop += domEl.offsetTop
|
|
|
}
|
|
|
if (!isNaN(domEl.offsetLeft)) {
|
|
|
offsetLeft += domEl.offsetLeft
|
|
|
}
|
|
|
domEl = domEl.offsetParent
|
|
|
} while (domEl)
|
|
|
|
|
|
return {
|
|
|
top: offsetTop,
|
|
|
left: offsetLeft,
|
|
|
height: offsetHeight,
|
|
|
width: offsetWidth
|
|
|
}
|
|
|
}
|
|
|
|
|
|
function _isElemVisible (elem) {
|
|
|
var offset = _getOffset(elem.domEl)
|
|
|
var container = _getContainer(elem.config.container)
|
|
|
var scrolled = _getScrolled(elem.config.container)
|
|
|
var vF = elem.config.viewFactor
|
|
|
|
|
|
// Define the element geometry.
|
|
|
var elemHeight = offset.height
|
|
|
var elemWidth = offset.width
|
|
|
var elemTop = offset.top
|
|
|
var elemLeft = offset.left
|
|
|
var elemBottom = elemTop + elemHeight
|
|
|
var elemRight = elemLeft + elemWidth
|
|
|
|
|
|
return confirmBounds() || isPositionFixed()
|
|
|
|
|
|
function confirmBounds () {
|
|
|
// Define the element’s functional boundaries using its view factor.
|
|
|
var top = elemTop + elemHeight * vF
|
|
|
var left = elemLeft + elemWidth * vF
|
|
|
var bottom = elemBottom - elemHeight * vF
|
|
|
var right = elemRight - elemWidth * vF
|
|
|
|
|
|
// Define the container functional boundaries using its view offset.
|
|
|
var viewTop = scrolled.y + elem.config.viewOffset.top
|
|
|
var viewLeft = scrolled.x + elem.config.viewOffset.left
|
|
|
var viewBottom = scrolled.y - elem.config.viewOffset.bottom + container.height
|
|
|
var viewRight = scrolled.x - elem.config.viewOffset.right + container.width
|
|
|
|
|
|
return top < viewBottom &&
|
|
|
bottom > viewTop &&
|
|
|
left < viewRight &&
|
|
|
right > viewLeft
|
|
|
}
|
|
|
|
|
|
function isPositionFixed () {
|
|
|
return (window.getComputedStyle(elem.domEl).position === 'fixed')
|
|
|
}
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* Utilities
|
|
|
* ---------
|
|
|
*/
|
|
|
|
|
|
function Tools () {}
|
|
|
|
|
|
Tools.prototype.isObject = function (object) {
|
|
|
return object !== null && typeof object === 'object' && object.constructor === Object
|
|
|
}
|
|
|
|
|
|
Tools.prototype.isNode = function (object) {
|
|
|
return typeof window.Node === 'object'
|
|
|
? object instanceof window.Node
|
|
|
: object && typeof object === 'object' &&
|
|
|
typeof object.nodeType === 'number' &&
|
|
|
typeof object.nodeName === 'string'
|
|
|
}
|
|
|
|
|
|
Tools.prototype.isNodeList = function (object) {
|
|
|
var prototypeToString = Object.prototype.toString.call(object)
|
|
|
var regex = /^\[object (HTMLCollection|NodeList|Object)\]$/
|
|
|
|
|
|
return typeof window.NodeList === 'object'
|
|
|
? object instanceof window.NodeList
|
|
|
: object && typeof object === 'object' &&
|
|
|
regex.test(prototypeToString) &&
|
|
|
typeof object.length === 'number' &&
|
|
|
(object.length === 0 || this.isNode(object[0]))
|
|
|
}
|
|
|
|
|
|
Tools.prototype.forOwn = function (object, callback) {
|
|
|
if (!this.isObject(object)) {
|
|
|
throw new TypeError('Expected "object", but received "' + typeof object + '".')
|
|
|
} else {
|
|
|
for (var property in object) {
|
|
|
if (object.hasOwnProperty(property)) {
|
|
|
callback(property)
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
|
|
|
Tools.prototype.extend = function (target, source) {
|
|
|
this.forOwn(source, function (property) {
|
|
|
if (this.isObject(source[property])) {
|
|
|
if (!target[property] || !this.isObject(target[property])) {
|
|
|
target[property] = {}
|
|
|
}
|
|
|
this.extend(target[property], source[property])
|
|
|
} else {
|
|
|
target[property] = source[property]
|
|
|
}
|
|
|
}.bind(this))
|
|
|
return target
|
|
|
}
|
|
|
|
|
|
Tools.prototype.extendClone = function (target, source) {
|
|
|
return this.extend(this.extend({}, target), source)
|
|
|
}
|
|
|
|
|
|
Tools.prototype.isMobile = function () {
|
|
|
return /Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test(navigator.userAgent)
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* Polyfills
|
|
|
* --------
|
|
|
*/
|
|
|
|
|
|
_requestAnimationFrame = window.requestAnimationFrame ||
|
|
|
window.webkitRequestAnimationFrame ||
|
|
|
window.mozRequestAnimationFrame ||
|
|
|
function (callback) {
|
|
|
window.setTimeout(callback, 1000 / 60)
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* Module Wrapper
|
|
|
* --------------
|
|
|
*/
|
|
|
if (typeof define === 'function' && typeof define.amd === 'object' && define.amd) {
|
|
|
define(function () {
|
|
|
return ScrollReveal
|
|
|
})
|
|
|
} else if (typeof module !== 'undefined' && module.exports) {
|
|
|
module.exports = ScrollReveal
|
|
|
} else {
|
|
|
window.ScrollReveal = ScrollReveal
|
|
|
}
|
|
|
})();
|
