以下是 HTML5鼠标滚动树生长过程特效 的示例演示效果:
部分效果截图:
HTML代码(index.html):
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<script type="text/javascript" src="jquery.js"></script>
<script type="text/javascript" src="skrollr.js"></script>
<style>
#info {
position: fixed;
top: 20px;
left: 20px;
background-color: rgba(0,0,0,0.5);
color: #fff;
padding: 20px;
z-index: 9999;
}
section {
height: 5000px;
}
#slide-1 .bcg {
height: 100%;
width: 100%;
background-image: url('img/bcg_paper.png');
background-repeat: repeat;
background-position: center top;
background-attachment: fixed;
}
#scrollBaby {
width: 184px;
height: 286px;
background: url('img/img_get-scrolling.png') no-repeat top left;
position: fixed;
bottom: 0;
left: 50%;
margin-left: -92px;
}
#slide-1 #tree {
width: 380px; height: 550px;
position: fixed;
top: 50%;
left: 50%;
margin: -275px 0 0 -190px;
}
#slide-1 .item {position: absolute; top: 0; left: 0;}
#slide-1 .tree1 {bottom: 426px; left: 100px; top: auto;}
#slide-1 .tree2 {bottom: 309px; left: 73px; top: auto;}
#slide-1 .tree3 {bottom: 205px; left: 30px; top: auto;}
#slide-1 .tree4 {bottom: 101px; left: 14px; top: auto;}
#slide-1 .trunk {bottom: 87px; left: 167px; top: auto;}
#slide-1 .pot {bottom: 20px; left: 130px; top: auto;}
#slide-1 .shadow {bottom: 0; left: 24px; top: auto;}
</style>
<title>HTML5鼠标滚动树生长过程特效</title>
</head>
<body>
<div id="info">0</div>
<section id="slide-1">
<div class="bcg"></div>
<div id="scrollBaby"
data-top="transform:translateY(0px)"
data--875-top="transform:translateY(300px)"
data-anchor-target="#slide-1"
></div>
<div id="tree">
<div class="item tree1"
data-top="opacity: 0;"
data--1600-top="opacity: 0; transform: scale(0.5); bottom: 71px;"
data--2000-top="opacity: 1; transform: scale(0.5); bottom: 90px;"
data--4000-top="opacity: 1; transform: scale(1); bottom: 426px;"
data-anchor-target="#slide-1"
><img src="img/img_tree-p1.png"></div>
<div class="item tree2"
data-top="opacity: 0; transform: scale(0.3); bottom: 71px;"
data--2000-top="opacity: 0; transform: scale(0.3); bottom: 71px;"
data--2212-top="opacity: 1; transform: scale(0.45); bottom: 81px;"
data--4000-top="opacity: 1; transform: scale(1); bottom: 309px;"
data-anchor-target="#slide-1"
><img src="img/img_tree-p2.png"></div>
<div class="item tree3"
data-top="opacity: 0; transform: scale(0.3);"
data--2212-top="opacity: 0; transform: scale(0.3); bottom: 71px;"
data--2700-top="opacity: 1; transform: scale(0.55); bottom: 81px;"
data--4000-top="opacity: 1; transform: scale(1); bottom: 205px;"
data-anchor-target="#slide-1"
><img src="img/img_tree-p3.png"></div>
<div class="item tree4"
data-top="opacity: 0; transform: scale(0.3);"
data--3000-top="opacity: 0; transform: scale(0.52);"
data--3300-top="opacity: 1; transform: scale(0.60);"
data--4000-top="opacity: 1; transform: scale(1);"
data-anchor-target="#slide-1"
><img src="img/img_tree-p4.png"></div>
<div class="item trunk"
data-top="opacity: 0;"
data--1600-top="opacity: 0; transform: scale(0.3, 0.6);"
data--2000-top="opacity: 1; transform: scale(0.3, 0.6);"
data--4000-top="transform: scale(1,1);"
data-anchor-target="#slide-1"
><img src="img/img_trunk.png"></div>
<div class="item pot" data-top="opacity: 0; transform:translateY(-800px)" data--875-top="opacity: 1; transform[bounce]:translateY(-200px)" data--1500-top="opacity: 1; transform[bounce]:translateY(0)" data-anchor-target="#slide-1"><img src="img/img_pot.png"></div>
<div class="item shadow"
data-top="opacity: 0; transform: scale(0.6);"
data--3000-top="opacity: 0.2; transform: scale(0.6);"
data--4000-top="opacity: 1; transform: scale(1);"
data-anchor-target="#slide-1"
><img src="img/img_shadow.png"></div>
</div>
</section>
<script>
var s = skrollr.init({
render: function(data) {
//Log the current scroll position.
$('#info').text(data.curTop);
}
});
</script>
</body>
</html>JS代码(skrollr.js):
(function(window,document,undefined){
'use strict';
/* * Global api. */
var skrollr = window.skrollr ={
get:function(){
return _instance;
}
,//Main entry point.init:function(options){
return _instance || new Skrollr(options);
}
,VERSION:'0.6.17'}
;
//Minify optimization.var hasProp = Object.prototype.hasOwnProperty;
var Math = window.Math;
var getStyle = window.getComputedStyle;
//They will be filled when skrollr gets initialized.var documentElement;
var body;
var EVENT_TOUCHSTART = 'touchstart';
var EVENT_TOUCHMOVE = 'touchmove';
var EVENT_TOUCHCANCEL = 'touchcancel';
var EVENT_TOUCHEND = 'touchend';
var SKROLLABLE_CLASS = 'skrollable';
var SKROLLABLE_BEFORE_CLASS = SKROLLABLE_CLASS + '-before';
var SKROLLABLE_BETWEEN_CLASS = SKROLLABLE_CLASS + '-between';
var SKROLLABLE_AFTER_CLASS = SKROLLABLE_CLASS + '-after';
var SKROLLR_CLASS = 'skrollr';
var NO_SKROLLR_CLASS = 'no-' + SKROLLR_CLASS;
var SKROLLR_DESKTOP_CLASS = SKROLLR_CLASS + '-desktop';
var SKROLLR_MOBILE_CLASS = SKROLLR_CLASS + '-mobile';
var DEFAULT_EASING = 'linear';
var DEFAULT_DURATION = 1000;
//msvar DEFAULT_MOBILE_DECELERATION = 0.004;
//pixel/ms²var DEFAULT_SMOOTH_SCROLLING_DURATION = 200;
//msvar ANCHOR_START = 'start';
var ANCHOR_END = 'end';
var ANCHOR_CENTER = 'center';
var ANCHOR_BOTTOM = 'bottom';
//The property which will be added to the DOM element to hold the ID of the skrollable.var SKROLLABLE_ID_DOM_PROPERTY = '___skrollable_id';
var rxTouchIgnoreTags = /^(?:input|textarea|button|select)$/i;
var rxTrim = /^\s+|\s+$/g;
//Find all data-attributes. data-[_constant]-[offset]-[anchor]-[anchor].var rxKeyframeAttribute = /^data(?:-(_\w+))?(?:-?(-?\d*\.?\d+p?))?(?:-?(start|end|top|center|bottom))?(?:-?(top|center|bottom))?$/;
var rxPropValue = /\s*([\w\-\[\]]+)\s*:\s*(.+?)\s*(?:;
|$)/gi;
//Easing function names follow the property in square brackets.var rxPropEasing = /^([a-z\-]+)\[(\w+)\]$/;
var rxCamelCase = /-([a-z])/g;
var rxCamelCaseFn = function(str,letter){
return letter.toUpperCase();
}
;
//Numeric values with optional sign.var rxNumericValue = /[\-+]?[\d]*\.?[\d]+/g;
//Used to replace occurences of{
?}
with a number.var rxInterpolateString = /\{
\?\}
/g;
//Finds rgb(a) colors,which don't use the percentage notation.var rxRGBAIntegerColor = /rgba?\(\s*-?\d+\s*,\s*-?\d+\s*,\s*-?\d+/g;
//Finds all gradients.var rxGradient = /[a-z\-]+-gradient/g;
//Vendor prefix. Will be set once skrollr gets initialized.var theCSSPrefix = '';
var theDashedCSSPrefix = '';
//Will be called once (when skrollr gets initialized).var detectCSSPrefix = function(){
//Only relevant prefixes. May be extended.//Could be dangerous if there will ever be a CSS property which actually starts with "ms". Don't hope so.var rxPrefixes = /^(?:O|Moz|webkit|ms)|(?:-(?:o|moz|webkit|ms)-)/;
//Detect prefix for current browser by finding the first property using a prefix.if(!getStyle){
return;
}
var style = getStyle(body,null);
for(var k in style){
//We check the key and if the key is a number,we check the value as well,because safari's getComputedStyle returns some weird array-like thingy.theCSSPrefix = (k.match(rxPrefixes) || (+k == k && style[k].match(rxPrefixes)));
if(theCSSPrefix){
break;
}
}
//Did we even detect a prefix?if(!theCSSPrefix){
theCSSPrefix = theDashedCSSPrefix = '';
return;
}
theCSSPrefix = theCSSPrefix[0];
//We could have detected either a dashed prefix or this camelCaseish-inconsistent stuff.if(theCSSPrefix.slice(0,1) === '-'){
theDashedCSSPrefix = theCSSPrefix;
//There's no logic behind these. Need a look up.theCSSPrefix = ({
'-webkit-':'webkit','-moz-':'Moz','-ms-':'ms','-o-':'O'}
)[theCSSPrefix];
}
else{
theDashedCSSPrefix = '-' + theCSSPrefix.toLowerCase() + '-';
}
}
;
var polyfillRAF = function(){
var requestAnimFrame = window.requestAnimationFrame || window[theCSSPrefix.toLowerCase() + 'RequestAnimationFrame'];
var lastTime = _now();
if(_isMobile || !requestAnimFrame){
requestAnimFrame = function(callback){
//How long did it take to render?var deltaTime = _now() - lastTime;
var delay = Math.max(0,1000 / 60 - deltaTime);
return window.setTimeout(function(){
lastTime = _now();
callback();
}
,delay);
}
;
}
return requestAnimFrame;
}
;
var polyfillCAF = function(){
var cancelAnimFrame = window.cancelAnimationFrame || window[theCSSPrefix.toLowerCase() + 'CancelAnimationFrame'];
if(_isMobile || !cancelAnimFrame){
cancelAnimFrame = function(timeout){
return window.clearTimeout(timeout);
}
;
}
return cancelAnimFrame;
}
;
//Built-in easing functions.var easings ={
begin:function(){
return 0;
}
,end:function(){
return 1;
}
,linear:function(p){
return p;
}
,quadratic:function(p){
return p * p;
}
,cubic:function(p){
return p * p * p;
}
,swing:function(p){
return (-Math.cos(p * Math.PI) / 2) + 0.5;
}
,sqrt:function(p){
return Math.sqrt(p);
}
,outCubic:function(p){
return (Math.pow((p - 1),3) + 1);
}
,//see https://www.desmos.com/calculator/tbr20s8vd2 for how I did thisbounce:function(p){
var a;
if(p <= 0.5083){
a = 3;
}
else if(p <= 0.8489){
a = 9;
}
else if(p <= 0.96208){
a = 27;
}
else if(p <= 0.99981){
a = 91;
}
else{
return 1;
}
return 1 - Math.abs(3 * Math.cos(p * a * 1.028) / a);
}
}
;
/** * Constructor. */
function Skrollr(options){
documentElement = document.documentElement;
body = document.body;
detectCSSPrefix();
_instance = this;
options = options ||{
}
;
_constants = options.constants ||{
}
;
//We allow defining custom easings or overwrite existing.if(options.easing){
for(var e in options.easing){
easings[e] = options.easing[e];
}
}
_edgeStrategy = options.edgeStrategy || 'set';
_listeners ={
//Function to be called right before rendering.beforerender:options.beforerender,//Function to be called right after finishing rendering.render:options.render}
;
//forceHeight is true by default_forceHeight = options.forceHeight !== false;
if(_forceHeight){
_scale = options.scale || 1;
}
_mobileDeceleration = options.mobileDeceleration || DEFAULT_MOBILE_DECELERATION;
_smoothScrollingEnabled = options.smoothScrolling !== false;
_smoothScrollingDuration = options.smoothScrollingDuration || DEFAULT_SMOOTH_SCROLLING_DURATION;
//Dummy object. Will be overwritten in the _render method when smooth scrolling is calculated._smoothScrolling ={
targetTop:_instance.getScrollTop()}
;
//A custom check function may be passed._isMobile = ((options.mobileCheck || function(){
return (/Android|iPhone|iPad|iPod|BlackBerry|Windows Phone/i).test(navigator.userAgent || navigator.vendor || window.opera);
}
)());
if(_isMobile){
_skrollrBody = document.getElementById('skrollr-body');
//Detect 3d transform if there's a skrollr-body (only needed for #skrollr-body).if(_skrollrBody){
_detect3DTransforms();
}
_initMobile();
_updateClass(documentElement,[SKROLLR_CLASS,SKROLLR_MOBILE_CLASS],[NO_SKROLLR_CLASS]);
}
else{
_updateClass(documentElement,[SKROLLR_CLASS,SKROLLR_DESKTOP_CLASS],[NO_SKROLLR_CLASS]);
}
//Triggers parsing of elements and a first reflow._instance.refresh();
_addEvent(window,'resize orientationchange',function(){
var width = documentElement.clientWidth;
var height = documentElement.clientHeight;
//Only reflow if the size actually changed (#271).if(height !== _lastViewportHeight || width !== _lastViewportWidth){
_lastViewportHeight = height;
_lastViewportWidth = width;
_requestReflow = true;
}
}
);
var requestAnimFrame = polyfillRAF();
//Let's go.(function animloop(){
_render();
_animFrame = requestAnimFrame(animloop);
}
());
return _instance;
}
/** * (Re)parses some or all elements. */
Skrollr.prototype.refresh = function(elements){
var elementIndex;
var elementsLength;
var ignoreID = false;
//Completely reparse anything without argument.if(elements === undefined){
//Ignore that some elements may already have a skrollable ID.ignoreID = true;
_skrollables = [];
_skrollableIdCounter = 0;
elements = document.getElementsByTagName('*');
}
else{
//We accept a single element or an array of elements.elements = [].concat(elements);
}
elementIndex = 0;
elementsLength = elements.length;
for(;
elementIndex < elementsLength;
elementIndex++){
var el = elements[elementIndex];
var anchorTarget = el;
var keyFrames = [];
//If this particular element should be smooth scrolled.var smoothScrollThis = _smoothScrollingEnabled;
//The edge strategy for this particular element.var edgeStrategy = _edgeStrategy;
if(!el.attributes){
continue;
}
//Iterate over all attributes and search for key frame attributes.var attributeIndex = 0;
var attributesLength = el.attributes.length;
for (;
attributeIndex < attributesLength;
attributeIndex++){
var attr = el.attributes[attributeIndex];
if(attr.name === 'data-anchor-target'){
anchorTarget = document.querySelector(attr.value);
if(anchorTarget === null){
throw 'Unable to find anchor target "' + attr.value + '"';
}
continue;
}
//Global smooth scrolling can be overridden by the element attribute.if(attr.name === 'data-smooth-scrolling'){
smoothScrollThis = attr.value !== 'off';
continue;
}
//Global edge strategy can be overridden by the element attribute.if(attr.name === 'data-edge-strategy'){
edgeStrategy = attr.value;
continue;
}
var match = attr.name.match(rxKeyframeAttribute);
if(match === null){
continue;
}
var kf ={
props:attr.value,//Point back to the element as well.element:el}
;
keyFrames.push(kf);
var constant = match[1];
//If there is a constant,get it's value or fall back to 0.constant = constant && _constants[constant.substr(1)] || 0;
//Parse key frame offset. If undefined will be casted to 0.var offset = match[2];
//Is it a percentage offset?if(/p$/.test(offset)){
kf.isPercentage = true;
kf.offset = ((offset.slice(0,-1) | 0) + constant) / 100;
}
else{
kf.offset = (offset | 0) + constant;
}
var anchor1 = match[3];
//If second anchor is not set,the first will be taken for both.var anchor2 = match[4] || anchor1;
//"absolute" (or "classic") mode,where numbers mean absolute scroll offset.if(!anchor1 || anchor1 === ANCHOR_START || anchor1 === ANCHOR_END){
kf.mode = 'absolute';
//data-end needs to be calculated after all key frames are known.if(anchor1 === ANCHOR_END){
kf.isEnd = true;
}
else if(!kf.isPercentage){
//For data-start we can already set the key frame w/o calculations.//#59:"scale" options should only affect absolute mode.kf.frame = kf.offset * _scale;
delete kf.offset;
}
}
//"relative" mode,where numbers are relative to anchors.else{
kf.mode = 'relative';
kf.anchors = [anchor1,anchor2];
}
}
//Does this element have key frames?if(!keyFrames.length){
continue;
}
//Will hold the original style and class attributes before we controlled the element (see #80).var styleAttr,classAttr;
var id;
if(!ignoreID && SKROLLABLE_ID_DOM_PROPERTY in el){
//We already have this element under control. Grab the corresponding skrollable id.id = el[SKROLLABLE_ID_DOM_PROPERTY];
styleAttr = _skrollables[id].styleAttr;
classAttr = _skrollables[id].classAttr;
}
else{
//It's an unknown element. Asign it a new skrollable id.id = (el[SKROLLABLE_ID_DOM_PROPERTY] = _skrollableIdCounter++);
styleAttr = el.style.cssText;
classAttr = _getClass(el);
}
_skrollables[id] ={
element:el,styleAttr:styleAttr,classAttr:classAttr,anchorTarget:anchorTarget,keyFrames:keyFrames,smoothScrolling:smoothScrollThis,edgeStrategy:edgeStrategy}
;
_updateClass(el,[SKROLLABLE_CLASS],[]);
}
//Reflow for the first time._reflow();
//Now that we got all key frame numbers right,actually parse the properties.elementIndex = 0;
elementsLength = elements.length;
for(;
elementIndex < elementsLength;
elementIndex++){
var sk = _skrollables[elements[elementIndex][SKROLLABLE_ID_DOM_PROPERTY]];
if(sk === undefined){
continue;
}
//Parse the property string to objects_parseProps(sk);
//Fill key frames with missing properties from left and right_fillProps(sk);
}
return _instance;
}
;
/** * Transform "relative" mode to "absolute" mode. * That is,calculate anchor position and offset of element. */
Skrollr.prototype.relativeToAbsolute = function(element,viewportAnchor,elementAnchor){
var viewportHeight = documentElement.clientHeight;
var box = element.getBoundingClientRect();
var absolute = box.top;
//#100:IE doesn't supply "height" with getBoundingClientRect.var boxHeight = box.bottom - box.top;
if(viewportAnchor === ANCHOR_BOTTOM){
absolute -= viewportHeight;
}
else if(viewportAnchor === ANCHOR_CENTER){
absolute -= viewportHeight / 2;
}
if(elementAnchor === ANCHOR_BOTTOM){
absolute += boxHeight;
}
else if(elementAnchor === ANCHOR_CENTER){
absolute += boxHeight / 2;
}
//Compensate scrolling since getBoundingClientRect is relative to viewport.absolute += _instance.getScrollTop();
return (absolute + 0.5) | 0;
}
;
/** * Animates scroll top to new position. */
Skrollr.prototype.animateTo = function(top,options){
options = options ||{
}
;
var now = _now();
var scrollTop = _instance.getScrollTop();
//Setting this to a new value will automatically cause the current animation to stop,if any._scrollAnimation ={
startTop:scrollTop,topDiff:top - scrollTop,targetTop:top,duration:options.duration || DEFAULT_DURATION,startTime:now,endTime:now + (options.duration || DEFAULT_DURATION),easing:easings[options.easing || DEFAULT_EASING],done:options.done}
;
//Don't queue the animation if there's nothing to animate.if(!_scrollAnimation.topDiff){
if(_scrollAnimation.done){
_scrollAnimation.done.call(_instance,false);
}
_scrollAnimation = undefined;
}
return _instance;
}
;
/** * Stops animateTo animation. */
Skrollr.prototype.stopAnimateTo = function(){
if(_scrollAnimation && _scrollAnimation.done){
_scrollAnimation.done.call(_instance,true);
}
_scrollAnimation = undefined;
}
;
/** * Returns if an animation caused by animateTo is currently running. */
Skrollr.prototype.isAnimatingTo = function(){
return !!_scrollAnimation;
}
;
Skrollr.prototype.setScrollTop = function(top,force){
_forceRender = (force === true);
if(_isMobile){
_mobileOffset = Math.min(Math.max(top,0),_maxKeyFrame);
}
else{
window.scrollTo(0,top);
}
return _instance;
}
;
Skrollr.prototype.getScrollTop = function(){
if(_isMobile){
return _mobileOffset;
}
else{
return window.pageYOffset || documentElement.scrollTop || body.scrollTop || 0;
}
}
;
Skrollr.prototype.getMaxScrollTop = function(){
return _maxKeyFrame;
}
;
Skrollr.prototype.on = function(name,fn){
_listeners[name] = fn;
return _instance;
}
;
Skrollr.prototype.off = function(name){
delete _listeners[name];
return _instance;
}
;
Skrollr.prototype.destroy = function(){
var cancelAnimFrame = polyfillCAF();
cancelAnimFrame(_animFrame);
_removeAllEvents();
_updateClass(documentElement,[NO_SKROLLR_CLASS],[SKROLLR_CLASS,SKROLLR_DESKTOP_CLASS,SKROLLR_MOBILE_CLASS]);
var skrollableIndex = 0;
var skrollablesLength = _skrollables.length;
for(;
skrollableIndex < skrollablesLength;
skrollableIndex++){
_reset(_skrollables[skrollableIndex].element);
}
documentElement.style.overflow = body.style.overflow = 'auto';
documentElement.style.height = body.style.height = 'auto';
if(_skrollrBody){
skrollr.setStyle(_skrollrBody,'transform','none');
}
_instance = undefined;
_skrollrBody = undefined;
_listeners = undefined;
_forceHeight = undefined;
_maxKeyFrame = 0;
_scale = 1;
_constants = undefined;
_mobileDeceleration = undefined;
_direction = 'down';
_lastTop = -1;
_lastViewportWidth = 0;
_lastViewportHeight = 0;
_requestReflow = false;
_scrollAnimation = undefined;
_smoothScrollingEnabled = undefined;
_smoothScrollingDuration = undefined;
_smoothScrolling = undefined;
_forceRender = undefined;
_skrollableIdCounter = 0;
_edgeStrategy = undefined;
_isMobile = false;
_mobileOffset = 0;
_translateZ = undefined;
}
;
/*Private methods.*/
var _initMobile = function(){
var initialElement;
var initialTouchY;
var initialTouchX;
var currentElement;
var currentTouchY;
var currentTouchX;
var lastTouchY;
var deltaY;
var initialTouchTime;
var currentTouchTime;
var lastTouchTime;
var deltaTime;
_addEvent(documentElement,[EVENT_TOUCHSTART,EVENT_TOUCHMOVE,EVENT_TOUCHCANCEL,EVENT_TOUCHEND].join(' '),function(e){
var touch = e.changedTouches[0];
currentElement = e.target;
//We don't want text nodes.while(currentElement.nodeType === 3){
currentElement = currentElement.parentNode;
}
currentTouchY = touch.clientY;
currentTouchX = touch.clientX;
currentTouchTime = e.timeStamp;
if(!rxTouchIgnoreTags.test(currentElement.tagName)){
e.preventDefault();
}
switch(e.type){
case EVENT_TOUCHSTART://The last element we tapped on.if(initialElement){
initialElement.blur();
}
_instance.stopAnimateTo();
initialElement = currentElement;
initialTouchY = lastTouchY = currentTouchY;
initialTouchX = currentTouchX;
initialTouchTime = currentTouchTime;
break;
case EVENT_TOUCHMOVE:deltaY = currentTouchY - lastTouchY;
deltaTime = currentTouchTime - lastTouchTime;
_instance.setScrollTop(_mobileOffset - deltaY,true);
lastTouchY = currentTouchY;
lastTouchTime = currentTouchTime;
break;
default:case EVENT_TOUCHCANCEL:case EVENT_TOUCHEND:var distanceY = initialTouchY - currentTouchY;
var distanceX = initialTouchX - currentTouchX;
var distance2 = distanceX * distanceX + distanceY * distanceY;
//Check if it was more like a tap (moved less than 7px).if(distance2 < 49){
if(!rxTouchIgnoreTags.test(initialElement.tagName)){
initialElement.focus();
//It was a tap,click the element.var clickEvent = document.createEvent('MouseEvents');
clickEvent.initMouseEvent('click',true,true,e.view,1,touch.screenX,touch.screenY,touch.clientX,touch.clientY,e.ctrlKey,e.altKey,e.shiftKey,e.metaKey,0,null);
initialElement.dispatchEvent(clickEvent);
}
return;
}
initialElement = undefined;
var speed = deltaY / deltaTime;
//Cap speed at 3 pixel/ms.speed = Math.max(Math.min(speed,3),-3);
var duration = Math.abs(speed / _mobileDeceleration);
var targetOffset = speed * duration + 0.5 * _mobileDeceleration * duration * duration;
var targetTop = _instance.getScrollTop() - targetOffset;
//Relative duration change for when scrolling above bounds.var targetRatio = 0;
//Change duration proportionally when scrolling would leave bounds.if(targetTop > _maxKeyFrame){
targetRatio = (_maxKeyFrame - targetTop) / targetOffset;
targetTop = _maxKeyFrame;
}
else if(targetTop < 0){
targetRatio = -targetTop / targetOffset;
targetTop = 0;
}
duration = duration * (1 - targetRatio);
_instance.animateTo((targetTop + 0.5) | 0,{
easing:'outCubic',duration:duration}
);
break;
}
}
);
//Just in case there has already been some native scrolling,reset it.window.scrollTo(0,0);
documentElement.style.overflow = body.style.overflow = 'hidden';
}
;
/** * Updates key frames which depend on others. * That is "end" in "absolute" mode and all key frames in "relative" mode. */
var _updateDependentKeyFrames = function(){
var skrollable;
var element;
var anchorTarget;
var keyFrames;
var keyFrameIndex;
var keyFramesLength;
var kf;
var skrollableIndex;
var skrollablesLength;
//First process all relative-mode elements and find the max key frame.skrollableIndex = 0;
skrollablesLength = _skrollables.length;
for(;
skrollableIndex < skrollablesLength;
skrollableIndex++){
skrollable = _skrollables[skrollableIndex];
element = skrollable.element;
anchorTarget = skrollable.anchorTarget;
keyFrames = skrollable.keyFrames;
keyFrameIndex = 0;
keyFramesLength = keyFrames.length;
for(;
keyFrameIndex < keyFramesLength;
keyFrameIndex++){
kf = keyFrames[keyFrameIndex];
var offset = kf.offset;
if(kf.isPercentage){
//Convert the offset to percentage of the viewport height.offset = offset * documentElement.clientHeight;
//Absolute + percentage mode.kf.frame = offset;
}
if(kf.mode === 'relative'){
_reset(element);
kf.frame = _instance.relativeToAbsolute(anchorTarget,kf.anchors[0],kf.anchors[1]) - offset;
_reset(element,true);
}
//Only search for max key frame when forceHeight is enabled.if(_forceHeight){
//Find the max key frame,but don't use one of the data-end ones for comparison.if(!kf.isEnd && kf.frame > _maxKeyFrame){
_maxKeyFrame = kf.frame;
}
}
}
}
//#133:The document can be larger than the maxKeyFrame we found._maxKeyFrame = Math.max(_maxKeyFrame,_getDocumentHeight());
//Now process all data-end keyframes.skrollableIndex = 0;
skrollablesLength = _skrollables.length;
for(;
skrollableIndex < skrollablesLength;
skrollableIndex++){
skrollable = _skrollables[skrollableIndex];
keyFrames = skrollable.keyFrames;
keyFrameIndex = 0;
keyFramesLength = keyFrames.length;
for(;
keyFrameIndex < keyFramesLength;
keyFrameIndex++){
kf = keyFrames[keyFrameIndex];
if(kf.isEnd){
kf.frame = _maxKeyFrame - kf.offset;
}
}
skrollable.keyFrames.sort(_keyFrameComparator);
}
}
;
/** * Calculates and sets the style properties for the element at the given frame. * @param fakeFrame The frame to render at when smooth scrolling is enabled. * @param actualFrame The actual frame we are at. */
var _calcSteps = function(fakeFrame,actualFrame){
//Iterate over all skrollables.var skrollableIndex = 0;
var skrollablesLength = _skrollables.length;
for(;
skrollableIndex < skrollablesLength;
skrollableIndex++){
var skrollable = _skrollables[skrollableIndex];
var element = skrollable.element;
var frame = skrollable.smoothScrolling ? fakeFrame:actualFrame;
var frames = skrollable.keyFrames;
var firstFrame = frames[0].frame;
var lastFrame = frames[frames.length - 1].frame;
var beforeFirst = frame < firstFrame;
var afterLast = frame > lastFrame;
var firstOrLastFrame = frames[beforeFirst ? 0:frames.length - 1];
var key;
var value;
//If we are before/after the first/last frame,set the styles according to the given edge strategy.if(beforeFirst || afterLast){
//Check if we already handled this edge case last time.//Note:using setScrollTop it's possible that we jumped from one edge to the other.if(beforeFirst && skrollable.edge === -1 || afterLast && skrollable.edge === 1){
continue;
}
//Add the skrollr-before or -after class._updateClass(element,[beforeFirst ? SKROLLABLE_BEFORE_CLASS:SKROLLABLE_AFTER_CLASS],[SKROLLABLE_BEFORE_CLASS,SKROLLABLE_BETWEEN_CLASS,SKROLLABLE_AFTER_CLASS]);
//Remember that we handled the edge case (before/after the first/last keyframe).skrollable.edge = beforeFirst ? -1:1;
switch(skrollable.edgeStrategy){
case 'reset':_reset(element);
continue;
case 'ease'://Handle this case like it would be exactly at first/last keyframe and just pass it on.frame = firstOrLastFrame.frame;
break;
default:case 'set':var props = firstOrLastFrame.props;
for(key in props){
if(hasProp.call(props,key)){
value = _interpolateString(props[key].value);
skrollr.setStyle(element,key,value);
}
}
continue;
}
}
else{
//Did we handle an edge last time?if(skrollable.edge !== 0){
_updateClass(element,[SKROLLABLE_CLASS,SKROLLABLE_BETWEEN_CLASS],[SKROLLABLE_BEFORE_CLASS,SKROLLABLE_AFTER_CLASS]);
skrollable.edge = 0;
}
}
//Find out between which two key frames we are right now.var keyFrameIndex = 0;
var framesLength = frames.length - 1;
for(;
keyFrameIndex < framesLength;
keyFrameIndex++){
if(frame >= frames[keyFrameIndex].frame && frame <= frames[keyFrameIndex + 1].frame){
var left = frames[keyFrameIndex];
var right = frames[keyFrameIndex + 1];
for(key in left.props){
if(hasProp.call(left.props,key)){
var progress = (frame - left.frame) / (right.frame - left.frame);
//Transform the current progress using the given easing function.progress = left.props[key].easing(progress);
//Interpolate between the two valuesvalue = _calcInterpolation(left.props[key].value,right.props[key].value,progress);
value = _interpolateString(value);
skrollr.setStyle(element,key,value);
}
}
break;
}
}
}
}
;
/** * Renders all elements. */
var _render = function(){
if(_requestReflow){
_requestReflow = false;
_reflow();
}
//We may render something else than the actual scrollbar position.var renderTop = _instance.getScrollTop();
//If there's an animation,which ends in current render call,call the callback after rendering.var afterAnimationCallback;
var now = _now();
var progress;
//Before actually rendering handle the scroll animation,if any.if(_scrollAnimation){
//It's overif(now >= _scrollAnimation.endTime){
renderTop = _scrollAnimation.targetTop;
afterAnimationCallback = _scrollAnimation.done;
_scrollAnimation = undefined;
}
else{
//Map the current progress to the new progress using given easing function.progress = _scrollAnimation.easing((now - _scrollAnimation.startTime) / _scrollAnimation.duration);
renderTop = (_scrollAnimation.startTop + progress * _scrollAnimation.topDiff) | 0;
}
_instance.setScrollTop(renderTop,true);
}
//Smooth scrolling only if there's no animation running and if we're not forcing the rendering.else if(!_forceRender){
var smoothScrollingDiff = _smoothScrolling.targetTop - renderTop;
//The user scrolled,start new smooth scrolling.if(smoothScrollingDiff){
_smoothScrolling ={
startTop:_lastTop,topDiff:renderTop - _lastTop,targetTop:renderTop,startTime:_lastRenderCall,endTime:_lastRenderCall + _smoothScrollingDuration}
;
}
//Interpolate the internal scroll position (not the actual scrollbar).if(now <= _smoothScrolling.endTime){
//Map the current progress to the new progress using easing function.progress = easings.sqrt((now - _smoothScrolling.startTime) / _smoothScrollingDuration);
renderTop = (_smoothScrolling.startTop + progress * _smoothScrolling.topDiff) | 0;
}
}
//That's were we actually "scroll" on mobile.if(_isMobile && _skrollrBody){
//Set the transform ("scroll it").skrollr.setStyle(_skrollrBody,'transform','translate(0,' + -(_mobileOffset) + 'px) ' + _translateZ);
}
//Did the scroll position even change?if(_forceRender || _lastTop !== renderTop){
//Remember in which direction are we scrolling?_direction = (renderTop > _lastTop) ? 'down':(renderTop < _lastTop ? 'up':_direction);
_forceRender = false;
var listenerParams ={
curTop:renderTop,lastTop:_lastTop,maxTop:_maxKeyFrame,direction:_direction}
;
//Tell the listener we are about to render.var continueRendering = _listeners.beforerender && _listeners.beforerender.call(_instance,listenerParams);
//The beforerender listener function is able the cancel rendering.if(continueRendering !== false){
//Now actually interpolate all the styles._calcSteps(renderTop,_instance.getScrollTop());
//Remember when we last rendered._lastTop = renderTop;
if(_listeners.render){
_listeners.render.call(_instance,listenerParams);
}
}
if(afterAnimationCallback){
afterAnimationCallback.call(_instance,false);
}
}
_lastRenderCall = now;
}
;
/** * Parses the properties for each key frame of the given skrollable. */
var _parseProps = function(skrollable){
//Iterate over all key framesvar keyFrameIndex = 0;
var keyFramesLength = skrollable.keyFrames.length;
for(;
keyFrameIndex < keyFramesLength;
keyFrameIndex++){
var frame = skrollable.keyFrames[keyFrameIndex];
var easing;
var value;
var prop;
var props ={
}
;
var match;
while((match = rxPropValue.exec(frame.props)) !== null){
prop = match[1];
value = match[2];
easing = prop.match(rxPropEasing);
//Is there an easing specified for this prop?if(easing !== null){
prop = easing[1];
easing = easing[2];
}
else{
easing = DEFAULT_EASING;
}
//Exclamation point at first position forces the value to be taken literal.value = value.indexOf('!') ? _parseProp(value):[value.slice(1)];
//Save the prop for this key frame with his value and easing functionprops[prop] ={
value:value,easing:easings[easing]}
;
}
frame.props = props;
}
}
;
/** * Parses a value extracting numeric values and generating a format string * for later interpolation of the new values in old string. * * @param val The CSS value to be parsed. * @return Something like ["rgba(?%,?%,?%,?)",100,50,0,.7] * where the first element is the format string later used * and all following elements are the numeric value. */
var _parseProp = function(val){
var numbers = [];
//One special case,where floats don't work.//We replace all occurences of rgba colors//which don't use percentage notation with the percentage notation.rxRGBAIntegerColor.lastIndex = 0;
val = val.replace(rxRGBAIntegerColor,function(rgba){
return rgba.replace(rxNumericValue,function(n){
return n / 255 * 100 + '%';
}
);
}
);
//Handle prefixing of "gradient" values.//For now only the prefixed value will be set. Unprefixed isn't supported anyway.if(theDashedCSSPrefix){
rxGradient.lastIndex = 0;
val = val.replace(rxGradient,function(s){
return theDashedCSSPrefix + s;
}
);
}
//Now parse ANY number inside this string and create a format string.val = val.replace(rxNumericValue,function(n){
numbers.push(+n);
return '{
?}
';
}
);
//Add the formatstring as first value.numbers.unshift(val);
return numbers;
}
;
/** * Fills the key frames with missing left and right hand properties. * If key frame 1 has property X and key frame 2 is missing X,* but key frame 3 has X again,then we need to assign X to key frame 2 too. * * @param sk A skrollable. */
var _fillProps = function(sk){
//Will collect the properties key frame by key framevar propList ={
}
;
var keyFrameIndex;
var keyFramesLength;
//Iterate over all key frames from left to rightkeyFrameIndex = 0;
keyFramesLength = sk.keyFrames.length;
for(;
keyFrameIndex < keyFramesLength;
keyFrameIndex++){
_fillPropForFrame(sk.keyFrames[keyFrameIndex],propList);
}
//Now do the same from right to fill the last gapspropList ={
}
;
//Iterate over all key frames from right to leftkeyFrameIndex = sk.keyFrames.length - 1;
for(;
keyFrameIndex >= 0;
keyFrameIndex--){
_fillPropForFrame(sk.keyFrames[keyFrameIndex],propList);
}
}
;
var _fillPropForFrame = function(frame,propList){
var key;
//For each key frame iterate over all right hand properties and assign them,//but only if the current key frame doesn't have the property by itselffor(key in propList){
//The current frame misses this property,so assign it.if(!hasProp.call(frame.props,key)){
frame.props[key] = propList[key];
}
}
//Iterate over all props of the current frame and collect themfor(key in frame.props){
propList[key] = frame.props[key];
}
}
;
/** * Calculates the new values for two given values array. */
var _calcInterpolation = function(val1,val2,progress){
var valueIndex;
var val1Length = val1.length;
//They both need to have the same lengthif(val1Length !== val2.length){
throw 'Can\'t interpolate between "' + val1[0] + '" and "' + val2[0] + '"';
}
//Add the format string as first element.var interpolated = [val1[0]];
valueIndex = 1;
for(;
valueIndex < val1Length;
valueIndex++){
//That's the line where the two numbers are actually interpolated.interpolated[valueIndex] = val1[valueIndex] + ((val2[valueIndex] - val1[valueIndex]) * progress);
}
return interpolated;
}
;
/** * Interpolates the numeric values into the format string. */
var _interpolateString = function(val){
var valueIndex = 1;
rxInterpolateString.lastIndex = 0;
return val[0].replace(rxInterpolateString,function(){
return val[valueIndex++];
}
);
}
;
/** * Resets the class and style attribute to what it was before skrollr manipulated the element. * Also remembers the values it had before reseting,in order to undo the reset. */
var _reset = function(elements,undo){
//We accept a single element or an array of elements.elements = [].concat(elements);
var skrollable;
var element;
var elementsIndex = 0;
var elementsLength = elements.length;
for(;
elementsIndex < elementsLength;
elementsIndex++){
element = elements[elementsIndex];
skrollable = _skrollables[element[SKROLLABLE_ID_DOM_PROPERTY]];
//Couldn't find the skrollable for this DOM element.if(!skrollable){
continue;
}
if(undo){
//Reset class and style to the "dirty" (set by skrollr) values.element.style.cssText = skrollable.dirtyStyleAttr;
_updateClass(element,skrollable.dirtyClassAttr);
}
else{
//Remember the "dirty" (set by skrollr) class and style.skrollable.dirtyStyleAttr = element.style.cssText;
skrollable.dirtyClassAttr = _getClass(element);
//Reset class and style to what it originally was.element.style.cssText = skrollable.styleAttr;
_updateClass(element,skrollable.classAttr);
}
}
}
;
/** * Detects support for 3d transforms by applying it to the skrollr-body. */
var _detect3DTransforms = function(){
_translateZ = 'translateZ(0)';
skrollr.setStyle(_skrollrBody,'transform',_translateZ);
var computedStyle = getStyle(_skrollrBody);
var computedTransform = computedStyle.getPropertyValue('transform');
var computedTransformWithPrefix = computedStyle.getPropertyValue(theDashedCSSPrefix + 'transform');
var has3D = (computedTransform && computedTransform !== 'none') || (computedTransformWithPrefix && computedTransformWithPrefix !== 'none');
if(!has3D){
_translateZ = '';
}
}
;
/** * Set the CSS property on the given element. Sets prefixed properties as well. */
skrollr.setStyle = function(el,prop,val){
var style = el.style;
//Camel case.prop = prop.replace(rxCamelCase,rxCamelCaseFn).replace('-','');
//Make sure z-index gets a <integer>.//This is the only <integer> case we need to handle.if(prop === 'zIndex'){
if(isNaN(val)){
//If it's not a number,don't touch it.//It could for example be "auto" (#351).style[prop] = val;
}
else{
//Floor the number.style[prop] = '' + (val | 0);
}
}
//#64:"float" can't be set across browsers. Needs to use "cssFloat" for all except IE.else if(prop === 'float'){
style.styleFloat = style.cssFloat = val;
}
else{
//Need try-catch for old IE.try{
//Set prefixed property if there's a prefix.if(theCSSPrefix){
style[theCSSPrefix + prop.slice(0,1).toUpperCase() + prop.slice(1)] = val;
}
//Set unprefixed.style[prop] = val;
}
catch(ignore){
}
}
}
;
/** * Cross browser event handling. */
var _addEvent = skrollr.addEvent = function(element,names,callback){
var intermediate = function(e){
//Normalize IE event stuff.e = e || window.event;
if(!e.target){
e.target = e.srcElement;
}
if(!e.preventDefault){
e.preventDefault = function(){
e.returnValue = false;
}
;
}
return callback.call(this,e);
}
;
names = names.split(' ');
var name;
var nameCounter = 0;
var namesLength = names.length;
for(;
nameCounter < namesLength;
nameCounter++){
name = names[nameCounter];
if(element.addEventListener){
element.addEventListener(name,callback,false);
}
else{
element.attachEvent('on' + name,intermediate);
}
//Remember the events to be able to flush them later._registeredEvents.push({
element:element,name:name,listener:callback}
);
}
}
;
var _removeEvent = skrollr.removeEvent = function(element,names,callback){
names = names.split(' ');
var nameCounter = 0;
var namesLength = names.length;
for(;
nameCounter < namesLength;
nameCounter++){
if(element.removeEventListener){
element.removeEventListener(names[nameCounter],callback,false);
}
else{
element.detachEvent('on' + names[nameCounter],callback);
}
}
}
;
var _removeAllEvents = function(){
var eventData;
var eventCounter = 0;
var eventsLength = _registeredEvents.length;
for(;
eventCounter < eventsLength;
eventCounter++){
eventData = _registeredEvents[eventCounter];
_removeEvent(eventData.element,eventData.name,eventData.listener);
}
_registeredEvents = [];
}
;
var _reflow = function(){
var pos = _instance.getScrollTop();
//Will be recalculated by _updateDependentKeyFrames._maxKeyFrame = 0;
if(_forceHeight && !_isMobile){
//un-"force" the height to not mess with the calculations in _updateDependentKeyFrames (#216).body.style.height = 'auto';
}
_updateDependentKeyFrames();
if(_forceHeight && !_isMobile){
//"force" the height.body.style.height = (_maxKeyFrame + documentElement.clientHeight) + 'px';
}
//The scroll offset may now be larger than needed (on desktop the browser/os prevents scrolling farther than the bottom).if(_isMobile){
_instance.setScrollTop(Math.min(_instance.getScrollTop(),_maxKeyFrame));
}
else{
//Remember and reset the scroll pos (#217)._instance.setScrollTop(pos,true);
}
_forceRender = true;
}
;
/* * Returns the height of the document. */
var _getDocumentHeight = function(){
var skrollrBodyHeight = (_skrollrBody && _skrollrBody.offsetHeight || 0);
var bodyHeight = Math.max(skrollrBodyHeight,body.scrollHeight,body.offsetHeight,documentElement.scrollHeight,documentElement.offsetHeight,documentElement.clientHeight);
return bodyHeight - documentElement.clientHeight;
}
;
/** * Returns a string of space separated classnames for the current element. * Works with SVG as well. */
var _getClass = function(element){
var prop = 'className';
//SVG support by using className.baseVal instead of just className.if(window.SVGElement && element instanceof window.SVGElement){
element = element[prop];
prop = 'baseVal';
}
return element[prop];
}
;
/** * Adds and removes a CSS classes. * Works with SVG as well. * add and remove are arrays of strings,* or if remove is ommited add is a string and overwrites all classes. */
var _updateClass = function(element,add,remove){
var prop = 'className';
//SVG support by using className.baseVal instead of just className.if(window.SVGElement && element instanceof window.SVGElement){
element = element[prop];
prop = 'baseVal';
}
//When remove is ommited,we want to overwrite/set the classes.if(remove === undefined){
element[prop] = add;
return;
}
//Cache current classes. We will work on a string before passing back to DOM.var val = element[prop];
//All classes to be removed.var classRemoveIndex = 0;
var removeLength = remove.length;
for(;
classRemoveIndex < removeLength;
classRemoveIndex++){
val = _untrim(val).replace(_untrim(remove[classRemoveIndex]),' ');
}
val = _trim(val);
//All classes to be added.var classAddIndex = 0;
var addLength = add.length;
for(;
classAddIndex < addLength;
classAddIndex++){
//Only add if el not already has class.if(_untrim(val).indexOf(_untrim(add[classAddIndex])) === -1){
val += ' ' + add[classAddIndex];
}
}
element[prop] = _trim(val);
}
;
var _trim = function(a){
return a.replace(rxTrim,'');
}
;
/** * Adds a space before and after the string. */
var _untrim = function(a){
return ' ' + a + ' ';
}
;
var _now = Date.now || function(){
return +new Date();
}
;
var _keyFrameComparator = function(a,b){
return a.frame - b.frame;
}
;
/* * Private variables. */
//Singletonvar _instance;
/*A list of all elements which should be animated associated with their the metadata.Exmaple skrollable with two key frames animating from 100px width to 20px:skrollable ={
element:<the DOM element>,styleAttr:<style attribute of the element before skrollr>,classAttr:<class attribute of the element before skrollr>,keyFrames:[{
frame:100,props:{
width:{
value:['{
?}
px',100],easing:<reference to easing function>}
}
,mode:"absolute"}
,{
frame:200,props:{
width:{
value:['{
?}
px',20],easing:<reference to easing function>}
}
,mode:"absolute"}
]}
;
*/
var _skrollables;
var _skrollrBody;
var _listeners;
var _forceHeight;
var _maxKeyFrame = 0;
var _scale = 1;
var _constants;
var _mobileDeceleration;
//Current direction (up/down).var _direction = 'down';
//The last top offset value. Needed to determine direction.var _lastTop = -1;
//The last time we called the render method (doesn't mean we rendered!).var _lastRenderCall = _now();
//For detecting if it actually resized (#271).var _lastViewportWidth = 0;
var _lastViewportHeight = 0;
var _requestReflow = false;
//Will contain data about a running scrollbar animation,if any.var _scrollAnimation;
var _smoothScrollingEnabled;
var _smoothScrollingDuration;
//Will contain settins for smooth scrolling if enabled.var _smoothScrolling;
//Can be set by any operation/event to force rendering even if the scrollbar didn't move.var _forceRender;
//Each skrollable gets an unique ID incremented for each skrollable.//The ID is the index in the _skrollables array.var _skrollableIdCounter = 0;
var _edgeStrategy;
//Mobile specific vars. Will be stripped by UglifyJS when not in use.var _isMobile = false;
//The virtual scroll offset when using mobile scrolling.var _mobileOffset = 0;
//If the browser supports 3d transforms,this will be filled with 'translateZ(0)' (empty string otherwise).var _translateZ;
//Will contain data about registered events by skrollr.var _registeredEvents = [];
//Animation frame id returned by RequestAnimationFrame (or timeout when RAF is not supported).var _animFrame;
}
(window,document));
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