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scrollReveal.js
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scrollReveal.js
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/*
_ _ _____ _ _
| | | __ \ | | (_)
___ ___ _ __ ___ | | | |__) |_____ _____ __ _| | _ ___
/ __|/ __| '__/ _ \| | | _ // _ \ \ / / _ \/ _` | | | / __|
\__ \ (__| | | (_) | | | | \ \ __/\ V / __/ (_| | |_| \__ \
|___/\___|_| \___/|_|_|_| \_\___| \_/ \___|\__,_|_(_) |___/ v2.3.0
_/ |
|__/
================================================================================
scrollReveal.js (c) 2015 Julian Lloyd ( @julianlloyd )
Licensed under MIT ( http://www.opensource.org/licenses/mit-license.php )
==============================================================================*/
window.scrollReveal = (function( window ){
'use strict';
var _requestAnimFrame;
var _extend;
var _handler;
var 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%' },
rotate: { x: 0, y: 0, z: 0 },
opacity: 0,
mobile: false,
reset: false,
// Expects a reference to a DOM node (the <html> node by default)
// which is used as the context when checking element visibility.
viewport: window.document.documentElement,
// 'always' — delay every time an animation resets
// 'onload' - delay only for animations triggered by first load
// 'once' — delay only the first time an animation reveals
delay: 'once',
// vFactor changes when an element is considered in the viewport.
// The default value of 0.60 means 60% of an element must be
// visible for its reveal animation to trigger.
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;
var elem;
var 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;
var elem;
var visible;
// Begin element store digest.
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 ){
elem.animating = true;
complete( key );
}
} else if ( !visible && elem.config.reset ){
elem.domEl.setAttribute( 'style',
elem.styles.inline
+ elem.styles.initial
+ elem.styles.reset
);
}
}
}
// Digest complete, now un-block the event handler.
self.blocked = false;
// Cleans the DOM and removes completed elements from self.elems.
// @param {integer} key — self.elems property key.
function complete( 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 );
}
},
// 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 = {};
var config = {};
var words = elem.domEl.getAttribute('data-sr').split( /[, ]+/ );
words.forEach(function( keyword, i ){
switch ( keyword ){
case 'enter':
parsed.enter = words[ i + 1 ];
break;
case 'wait':
parsed.wait = words[ i + 1 ];
break;
case 'move':
parsed.move = words[ i + 1 ];
break;
case 'ease':
parsed.move = words[ i + 1 ];
parsed.ease = 'ease';
break;
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';
break;
}
parsed.move = words[ i + 1 ];
parsed.easing = 'ease-in';
break;
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';
break;
}
parsed.move = words[ i + 1 ];
parsed.easing = 'ease-in-out';
break;
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';
break;
}
parsed.move = words[ i + 1 ];
parsed.easing = 'ease-out';
break;
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 )';
break;
}
parsed.move = words[ i + 1 ];
parsed.easing = 'cubic-bezier( 0.6, 0.2, 0.1, 1 )';
break;
case 'over':
parsed.over = words[ i + 1 ];
break;
case 'flip':
case 'pitch':
parsed.rotate = parsed.rotate || {};
parsed.rotate.x = words[ i + 1 ];
break;
case 'spin':
case 'yaw':
parsed.rotate = parsed.rotate || {};
parsed.rotate.y = words[ i + 1 ];
break;
case 'roll':
parsed.rotate = parsed.rotate || {};
parsed.rotate.z = words[ i + 1 ];
break;
case 'reset':
if ( words[ i - 1 ] == 'no' ){
parsed.reset = false;
} else {
parsed.reset = true;
}
break;
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 ];
break;
}
parsed.scale.power = words[ i + 1 ];
break;
case 'vFactor':
case 'vF':
parsed.vFactor = words[ i + 1 ];
break;
case 'opacity':
parsed.opacity = words[ i + 1 ];
break;
default:
return;
}
});
// Build default config object, then apply any keywords 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';
} else if ( config.enter === 'left' || config.enter === 'right' ){
config.axis = 'X';
}
// 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 inline;
var initial;
var reset;
var target;
var transition;
var cfg = elem.config;
var duration = ( parseFloat( cfg.over ) + parseFloat( cfg.wait ) ) * 1000;
// Want to disable delay on mobile devices? Uncomment the line below.
// if ( self.isMobile() && self.config.mobile ) cfg.wait = 0;
if ( elem.domEl.getAttribute('style') ){
inline = elem.domEl.getAttribute('style') + '; visibility: visible; ';
} else {
inline = 'visibility: visible; ';
}
transition = '-webkit-transition: -webkit-transform ' + cfg.over + ' ' + cfg.easing + ' ' + cfg.wait + ', opacity ' + cfg.over + ' ' + cfg.easing + ' ' + cfg.wait + '; ' +
'transition: transform ' + cfg.over + ' ' + cfg.easing + ' ' + cfg.wait + ', opacity ' + cfg.over + ' ' + cfg.easing + ' ' + cfg.wait + '; ' +
'-webkit-perspective: 1000;' +
'-webkit-backface-visibility: hidden;';
reset = '-webkit-transition: -webkit-transform ' + cfg.over + ' ' + cfg.easing + ' 0s, opacity ' + cfg.over + ' ' + cfg.easing + ' 0s; ' +
'transition: transform ' + cfg.over + ' ' + cfg.easing + ' 0s, opacity ' + cfg.over + ' ' + cfg.easing + ' 0s; ' +
'-webkit-perspective: 1000; ' +
'-webkit-backface-visibility: hidden; ';
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: duration
};
// Constructs initial and target styles.
function build(){
if ( parseInt( cfg.move ) !== 0 ){
initial += ' translate' + cfg.axis + '(' + cfg.move + ')';
target += ' translate' + cfg.axis + '(0)';
}
if ( parseInt( cfg.scale.power ) !== 0 ){
if ( cfg.scale.direction === 'up' ){
cfg.scale.value = 1 - ( parseFloat( cfg.scale.power ) * 0.01 );
} else if ( cfg.scale.direction === 'down' ){
cfg.scale.value = 1 + ( parseFloat( cfg.scale.power ) * 0.01 );
}
initial += ' scale(' + cfg.scale.value + ')';
target += ' scale(1)';
}
if ( cfg.rotate.x ){
initial += ' rotateX(' + cfg.rotate.x + ')';
target += ' rotateX(0)';
}
if ( cfg.rotate.y ){
initial += ' rotateY(' + cfg.rotate.y + ')';
target += ' rotateY(0)';
}
if ( cfg.rotate.z ){
initial += ' rotateZ(' + cfg.rotate.z + ')';
target += ' rotateZ(0)';
}
initial += '; opacity: ' + cfg.opacity + '; ';
target += '; opacity: 1; ';
}
},
getViewportH: function(){
var client = self.config.viewport['clientHeight'];
var 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;
} else {
return self.config.viewport.scrollTop + self.config.viewport.offsetTop;
}
},
getOffset: function( el ){
var offsetTop = 0;
var 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;
var elTop = self.getOffset( elem.domEl ).top;
var elBottom = elTop + elHeight;
var vFactor = elem.config.vFactor || 0;
return ( confirmBounds() || isPositionFixed() );
function confirmBounds(){
var top = elTop + elHeight * vFactor;
var bottom = elBottom - elHeight * vFactor;
var viewBottom = self.scrolled + self.getViewportH();
var viewTop = self.scrolled;
return ( top < viewBottom ) && ( bottom > viewTop );
}
function isPositionFixed(){
var el = elem.domEl;
var style = el.currentStyle || window.getComputedStyle( el, null );
return style.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');
var cssPrefix = 'Webkit,Moz,O,'.split(',');
var 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 node = self.config.viewport;
var query = Array.prototype.slice.call( node.querySelectorAll('[data-sr]') );
query.forEach(function( el ){
el.removeAttribute('data-sr');
});
}
} // End of the scrollReveal prototype ======================================|
_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 );