forked from jlmakes/scrollreveal
/
scrollReveal.js
602 lines (434 loc) · 17.5 KB
/
scrollReveal.js
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/*
_ _ _____ _ _
| | | __ \ | | (_)
___ ___ _ __ ___ | | | |__) |_____ _____ __ _| | _ ___
/ __|/ __| '__/ _ \| | | _ // _ \ \ / / _ \/ _` | | | / __|
\__ \ (__| | | (_) | | | | \ \ __/\ V / __/ (_| | |_| \__ \
|___/\___|_| \___/|_|_|_| \_\___| \_/ \___|\__,_|_(_) |___/ v2.1.0
_/ |
|__/
============================================================================*/
/**
* scrollReveal.js (c) 2014 Julian Lloyd ( @julianlloyd )
*
* Licensed under the MIT license
* http://www.opensource.org/licenses/mit-license.php
*/
window.scrollReveal = (function( window ) {
'use strict'
var _requestAnimFrame
, extend
, handler
, self
function scrollReveal( config ) {
self = this
self.elems = {}
self.serial = 1
self.blocked = false
self.config = extend( self.defaults, config )
if ( self.isMobile() && !self.config.mobile || !self.isSupported() ) {
self.destroy()
return
}
if ( self.config.viewport == window.document.documentElement ) {
window.addEventListener( 'scroll', handler, false )
window.addEventListener( 'resize', handler, false )
} else self.config.viewport.addEventListener( 'scroll', handler, false )
self.init( true )
}
scrollReveal.prototype = {
defaults: {
enter: 'bottom',
move: '8px',
over: '0.6s',
wait: '0s',
easing: 'ease',
scale: { direction: 'up', power: '5%' },
opacity: 0,
mobile: false,
reset: false,
viewport: window.document.documentElement, // <HTML> element by default.
/**
* 'always' — delay every time an animation resets
* 'once' — delay only the first time an animation reveals
* 'onload' - delay only for animations triggered by self.init()
*/
delay: 'once',
/**
* vFactor changes when an element is considered in the viewport;
* the default requires 60% of an element be visible.
*/
vFactor: 0.60,
complete: function( el ) {} // Note: reset animations do not complete.
},
/**
* Queries the DOM, builds scrollReveal elements and triggers animation.
* @param {boolean} flag — a hook for controlling delay on first load.
*/
init: function( flag ) {
var serial
, elem
, query
query = Array.prototype.slice.call( self.config.viewport.querySelectorAll( '[data-sr]' ) )
query.forEach(function ( el ) {
serial = self.serial++
elem = self.elems[ serial ] = { domEl: el }
elem.config = self.configFactory( elem )
elem.styles = self.styleFactory( elem )
elem.seen = false
el.removeAttribute( 'data-sr' )
el.setAttribute( 'style',
elem.styles.inline
+ elem.styles.initial
)
})
self.scrolled = self.scrollY()
self.animate( flag )
},
/**
* Applies and removes appropriate styles.
* @param {boolean} flag — a hook for controlling delay on first load.
*/
animate: function( flag ) {
var key
, elem
, visible
, complete
/**
* Cleans the DOM and removes completed elements from self.elems.
* @param {integer} key — self.elems property key.
*/
complete = function( key ) {
var elem = self.elems[ key ]
setTimeout(function() {
elem.domEl.setAttribute( 'style', elem.styles.inline )
elem.config.complete( elem.domEl )
delete self.elems[ key ]
}, elem.styles.duration )
}
/**
* Begin loop.
*/
for ( key in self.elems ) {
if ( self.elems.hasOwnProperty( key ) ) {
elem = self.elems[ key ]
visible = self.isElemInViewport( elem )
if ( visible ) {
if ( self.config.delay === 'always'
|| ( self.config.delay === 'onload' && flag )
|| ( self.config.delay === 'once' && !elem.seen ) ) {
/**
* Use delay.
*/
elem.domEl.setAttribute( 'style',
elem.styles.inline
+ elem.styles.target
+ elem.styles.transition
)
} else {
/**
* Don’t use delay.
*/
elem.domEl.setAttribute( 'style',
elem.styles.inline
+ elem.styles.target
+ elem.styles.reset
)
}
elem.seen = true
if ( !elem.config.reset && !elem.animating ) {
/**
* Reset is DISABLED for this element,
* so let’s count down to animation complete.
*/
elem.animating = true
complete( key )
}
}
if ( !visible && elem.config.reset ) {
/**
* Reset is ENABLED for this element,
* so let’s apply its reset styles.
*/
elem.domEl.setAttribute( 'style',
elem.styles.inline
+ elem.styles.initial
+ elem.styles.reset
)
}
}
}
self.blocked = false
},
/**
* Parses an elements data-sr attribute, and returns a configuration object.
* @param {object} elem — An object from self.elems.
* @return {object}
*/
configFactory: function( elem ) {
var parsed = {}
, config = {}
, words = elem.domEl.getAttribute( 'data-sr' ).split( /[, ]+/ )
/**
* Find and remove any syntax sugar.
*/
words = self.filter( words )
words.forEach(function( keyword, i ) {
/**
* Find keywords.
*/
switch ( keyword ) {
case 'enter':
parsed.enter = words[ i + 1 ]
return
case 'wait':
parsed.wait = words[ i + 1 ]
return
case 'move':
parsed.move = words[ i + 1 ]
return
case 'ease':
parsed.move = words[ i + 1 ]
parsed.ease = 'ease'
return
case 'ease-in':
if ( words[ i + 1 ] == 'up' || words[ i + 1 ] == 'down' ) {
parsed.scale.direction = words[ i + 1 ]
parsed.scale.power = words[ i + 2 ]
parsed.easing = 'ease-in'
return
}
parsed.move = words[ i + 1 ]
parsed.easing = 'ease-in'
return
case 'ease-in-out':
if ( words[ i + 1 ] == 'up' || words[ i + 1 ] == 'down' ) {
parsed.scale.direction = words[ i + 1 ]
parsed.scale.power = words[ i + 2 ]
parsed.easing = 'ease-in-out'
return
}
parsed.move = words[ i + 1 ]
parsed.easing = 'ease-in-out'
return
case 'ease-out':
if ( words[ i + 1 ] == 'up' || words[ i + 1 ] == 'down' ) {
parsed.scale.direction = words[ i + 1 ]
parsed.scale.power = words[ i + 2 ]
parsed.easing = 'ease-out'
return
}
parsed.move = words[ i + 1 ]
parsed.easing = 'ease-out'
return
case 'hustle':
if ( words[ i + 1 ] == 'up' || words[ i + 1 ] == 'down' ) {
parsed.scale.direction = words[ i + 1 ]
parsed.scale.power = words[ i + 2 ]
parsed.easing = 'cubic-bezier( 0.6, 0.2, 0.1, 1 )'
return
}
parsed.move = words[ i + 1 ]
parsed.easing = 'cubic-bezier( 0.6, 0.2, 0.1, 1 )'
return
case 'over':
parsed.over = words[ i + 1 ]
return
case 'reset':
if ( words[ i - 1 ] == 'no' ) parsed.reset = false
else parsed.reset = true
return
case 'scale':
parsed.scale = {}
if ( words[ i + 1 ] == 'up' || words[ i + 1 ] == 'down' ) {
parsed.scale.direction = words[ i + 1 ]
parsed.scale.power = words[ i + 2 ]
return
}
parsed.scale.power = words[ i + 1 ]
return
default:
return
}
})
/**
* Build default config object, then apply any
* overrides parsed from the data-sr attribute.
*/
config = extend( config, self.config )
config = extend( config, parsed )
if ( config.enter == 'top' || config.enter == 'bottom' ) config.axis = 'Y'
if ( config.enter == 'left' || config.enter == 'right' ) config.axis = 'X'
/**
* Check for hustle easing.
*/
if ( config.easing == 'hustle' ) config.easing = 'cubic-bezier( 0.6, 0.2, 0.1, 1 )'
/**
* Let’s make sure our our pixel distances are negative for top and left.
* e.g. "enter top and move 25px" starts at 'top: -25px' in CSS.
*/
if ( config.enter == 'top' || config.enter == 'left' ) config.move = '-' + config.move
return config
},
/**
* Generates styles based on an elements configuration property.
* @param {object} elem — An object from self.elems.
* @return {object}
*/
styleFactory: function( elem ) {
var transition
, initial
, target
, reset
, inline
, build
inline = ( elem.domEl.getAttribute( 'style' ) ) ? elem.domEl.getAttribute( 'style' ) + '; visibility: visible; ' : 'visibility: visible; '
/**
* Want to disable delay on mobile devices? Uncomment the line below.
*/
//if ( self.isMobile() && self.config.mobile ) elem.config.wait = 0
transition = '-webkit-transition: -webkit-transform ' + elem.config.over + ' ' + elem.config.easing + ' ' + elem.config.wait + ', opacity ' + elem.config.over + ' ' + elem.config.easing + ' ' + elem.config.wait + '; ' +
'transition: transform ' + elem.config.over + ' ' + elem.config.easing + ' ' + elem.config.wait + ', opacity ' + elem.config.over + ' ' + elem.config.easing + ' ' + elem.config.wait + '; ' +
'-webkit-perspective: 1000;' +
'-webkit-backface-visibility: hidden;'
reset = '-webkit-transition: -webkit-transform ' + elem.config.over + ' ' + elem.config.easing + ' 0s, opacity ' + elem.config.over + ' ' + elem.config.easing + ' 0s; ' +
'transition: transform ' + elem.config.over + ' ' + elem.config.easing + ' 0s, opacity ' + elem.config.over + ' ' + elem.config.easing + ' 0s; ' +
'-webkit-perspective: 1000; ' +
'-webkit-backface-visibility: hidden; '
/**
* Constructs initial and target styles.
*/
build = function() {
if ( parseInt( elem.config.move ) != 0 ) {
initial += ' translate' + elem.config.axis + '(' + elem.config.move + ')'
target += ' translate' + elem.config.axis + '(0)'
}
if ( parseInt( elem.config.scale.power ) != 0 ) {
if ( elem.config.scale.direction == 'up' ) elem.config.scale.value = 1 - ( parseFloat( elem.config.scale.power ) * 0.01 )
if ( elem.config.scale.direction == 'down' ) elem.config.scale.value = 1 + ( parseFloat( elem.config.scale.power ) * 0.01 )
initial += ' scale(' + elem.config.scale.value + ')'
target += ' scale(1)'
}
initial += '; opacity: ' + elem.config.opacity + '; '
target += '; opacity: 1; ';
}
initial = 'transform:'
target = 'transform:'
build()
/**
* Build again for webkit.
*/
initial += '-webkit-transform:'
target += '-webkit-transform:'
build()
return {
transition: transition,
initial: initial,
target: target,
reset: reset,
inline: inline,
duration: ( ( parseFloat( elem.config.over ) + parseFloat( elem.config.wait ) ) * 1000 )
}
},
filter: function( words ) {
var filtered = []
var sugar = [
'from',
'the',
'and',
'then',
'but',
'with',
'please',
]
words.forEach(function( word ) {
if ( sugar.indexOf( word ) > -1 ) return
filtered.push( word )
return
})
return filtered
},
getViewportH: function() {
var client = self.config.viewport[ 'clientHeight' ]
, inner = window[ 'innerHeight' ]
if ( self.config.viewport == window.document.documentElement ) {
return ( client < inner ) ? inner : client
}
return client
},
scrollY: function() {
if ( self.config.viewport == window.document.documentElement ) return window.pageYOffset
return self.config.viewport.scrollTop + self.config.viewport.offsetTop
},
getOffset: function( el ) {
var offsetTop = 0
, offsetLeft = 0
do {
if ( !isNaN( el.offsetTop )) offsetTop += el.offsetTop
if ( !isNaN( el.offsetLeft )) offsetLeft += el.offsetLeft
} while ( el = el.offsetParent )
return {
top: offsetTop,
left: offsetLeft
}
},
isElemInViewport: function( elem ) {
var elHeight = elem.domEl.offsetHeight
, elTop = self.getOffset( elem.domEl ).top
, elBottom = elTop + elHeight
, vFactor = elem.config.vFactor || 0
return ( elTop + elHeight * vFactor < self.scrolled + self.getViewportH() )
&& ( elBottom - elHeight * vFactor > self.scrolled )
|| ( elem.domEl.currentStyle ? elem.domEl.currentStyle : window.getComputedStyle( elem.domEl, null ) ).position == 'fixed'
},
isMobile: function() {
var agent = navigator.userAgent || navigator.vendor || window.opera
return (/(ipad|playbook|silk|android|bb\d+|meego).+mobile|avantgo|bada\/|blackberry|blazer|compal|elaine|fennec|hiptop|iemobile|ip(hone|od)|iris|kindle|lge |maemo|midp|mmp|mobile.+firefox|netfront|opera m(ob|in)i|palm( os)?|phone|p(ixi|re)\/|plucker|pocket|psp|series(4|6)0|symbian|treo|up\.(browser|link)|vodafone|wap|windows (ce|phone)|xda|xiino/i.test( agent )||/1207|6310|6590|3gso|4thp|50[1-6]i|770s|802s|a wa|abac|ac(er|oo|s\-)|ai(ko|rn)|al(av|ca|co)|amoi|an(ex|ny|yw)|aptu|ar(ch|go)|as(te|us)|attw|au(di|\-m|r |s )|avan|be(ck|ll|nq)|bi(lb|rd)|bl(ac|az)|br(e|v)w|bumb|bw\-(n|u)|c55\/|capi|ccwa|cdm\-|cell|chtm|cldc|cmd\-|co(mp|nd)|craw|da(it|ll|ng)|dbte|dc\-s|devi|dica|dmob|do(c|p)o|ds(12|\-d)|el(49|ai)|em(l2|ul)|er(ic|k0)|esl8|ez([4-7]0|os|wa|ze)|fetc|fly(\-|_)|g1 u|g560|gene|gf\-5|g\-mo|go(\.w|od)|gr(ad|un)|haie|hcit|hd\-(m|p|t)|hei\-|hi(pt|ta)|hp( i|ip)|hs\-c|ht(c(\-| |_|a|g|p|s|t)|tp)|hu(aw|tc)|i\-(20|go|ma)|i230|iac( |\-|\/)|ibro|idea|ig01|ikom|im1k|inno|ipaq|iris|ja(t|v)a|jbro|jemu|jigs|kddi|keji|kgt( |\/)|klon|kpt |kwc\-|kyo(c|k)|le(no|xi)|lg( g|\/(k|l|u)|50|54|\-[a-w])|libw|lynx|m1\-w|m3ga|m50\/|ma(te|ui|xo)|mc(01|21|ca)|m\-cr|me(rc|ri)|mi(o8|oa|ts)|mmef|mo(01|02|bi|de|do|t(\-| |o|v)|zz)|mt(50|p1|v )|mwbp|mywa|n10[0-2]|n20[2-3]|n30(0|2)|n50(0|2|5)|n7(0(0|1)|10)|ne((c|m)\-|on|tf|wf|wg|wt)|nok(6|i)|nzph|o2im|op(ti|wv)|oran|owg1|p800|pan(a|d|t)|pdxg|pg(13|\-([1-8]|c))|phil|pire|pl(ay|uc)|pn\-2|po(ck|rt|se)|prox|psio|pt\-g|qa\-a|qc(07|12|21|32|60|\-[2-7]|i\-)|qtek|r380|r600|raks|rim9|ro(ve|zo)|s55\/|sa(ge|ma|mm|ms|ny|va)|sc(01|h\-|oo|p\-)|sdk\/|se(c(\-|0|1)|47|mc|nd|ri)|sgh\-|shar|sie(\-|m)|sk\-0|sl(45|id)|sm(al|ar|b3|it|t5)|so(ft|ny)|sp(01|h\-|v\-|v )|sy(01|mb)|t2(18|50)|t6(00|10|18)|ta(gt|lk)|tcl\-|tdg\-|tel(i|m)|tim\-|t\-mo|to(pl|sh)|ts(70|m\-|m3|m5)|tx\-9|up(\.b|g1|si)|utst|v400|v750|veri|vi(rg|te)|vk(40|5[0-3]|\-v)|vm40|voda|vulc|vx(52|53|60|61|70|80|81|83|85|98)|w3c(\-| )|webc|whit|wi(g |nc|nw)|wmlb|wonu|x700|yas\-|your|zeto|zte\-/i.test( agent.substr( 0, 4 ))) ? true : false
},
isSupported: function() {
var sensor = document.createElement( 'sensor' )
, cssPrefix = 'Webkit,Moz,O,'.split( ',' )
, tests = ( 'transition ' + cssPrefix.join( 'transition,' ) ).split( ',' )
for ( var i = 0; i < tests.length; i++ ) {
if ( !sensor.style[tests[i]] === '' ) return false
}
return true
},
destroy: function() {
var query
query = Array.prototype.slice.call( self.config.viewport.querySelectorAll( '[data-sr]' ) )
query.forEach(function ( el ) {
el.removeAttribute( 'data-sr' )
})
}
}
handler = function( e ) {
if ( !self.blocked ) {
self.blocked = true
self.scrolled = self.scrollY()
_requestAnimFrame( function() {
self.animate()
})
}
}
extend = function( target, src ) {
for ( var prop in src ) {
if ( src.hasOwnProperty( prop ) ) {
target[ prop ] = src[ prop ]
}
}
return target
}
/**
* RequestAnimationFrame polyfill.
*/
_requestAnimFrame = (function() {
return window.requestAnimationFrame ||
window.webkitRequestAnimationFrame ||
window.mozRequestAnimationFrame ||
function( callback ) {
window.setTimeout( callback, 1000 / 60 )
}
}())
return scrollReveal
})( window )