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jquery.fullPage.js
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jquery.fullPage.js
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/*!
* fullPage 2.9.6
* https://github.com/alvarotrigo/fullPage.js
* @license MIT licensed
*
* Copyright (C) 2015 alvarotrigo.com - A project by Alvaro Trigo
*/
(function(global, factory) {
'use strict';
if (typeof define === 'function' && define.amd) {
define(['jquery'], function($) {
return factory($, global, global.document, global.Math);
});
} else if (typeof exports === "object" && exports) {
module.exports = factory(require('jquery'), global, global.document, global.Math);
} else {
factory(jQuery, global, global.document, global.Math);
}
})(typeof window !== 'undefined' ? window : this, function($, window, document, Math, undefined) {
'use strict';
// keeping central set of classnames and selectors
var WRAPPER = 'fullpage-wrapper';
var WRAPPER_SEL = '.' + WRAPPER;
// slimscroll
var SCROLLABLE = 'fp-scrollable';
var SCROLLABLE_SEL = '.' + SCROLLABLE;
// util
var RESPONSIVE = 'fp-responsive';
var NO_TRANSITION = 'fp-notransition';
var DESTROYED = 'fp-destroyed';
var ENABLED = 'fp-enabled';
var VIEWING_PREFIX = 'fp-viewing';
var ACTIVE = 'active';
var ACTIVE_SEL = '.' + ACTIVE;
var COMPLETELY = 'fp-completely';
var COMPLETELY_SEL = '.' + COMPLETELY;
// section
var SECTION_DEFAULT_SEL = '.section';
var SECTION = 'fp-section';
var SECTION_SEL = '.' + SECTION;
var SECTION_ACTIVE_SEL = SECTION_SEL + ACTIVE_SEL;
var SECTION_FIRST_SEL = SECTION_SEL + ':first';
var SECTION_LAST_SEL = SECTION_SEL + ':last';
var TABLE_CELL = 'fp-tableCell';
var TABLE_CELL_SEL = '.' + TABLE_CELL;
var AUTO_HEIGHT = 'fp-auto-height';
var AUTO_HEIGHT_SEL = '.fp-auto-height';
var NORMAL_SCROLL = 'fp-normal-scroll';
var NORMAL_SCROLL_SEL = '.fp-normal-scroll';
// section nav
var SECTION_NAV = 'fp-nav';
var SECTION_NAV_SEL = '#' + SECTION_NAV;
var SECTION_NAV_TOOLTIP = 'fp-tooltip';
var SECTION_NAV_TOOLTIP_SEL='.'+SECTION_NAV_TOOLTIP;
var SHOW_ACTIVE_TOOLTIP = 'fp-show-active';
// slide
var SLIDE_DEFAULT_SEL = '.slide';
var SLIDE = 'fp-slide';
var SLIDE_SEL = '.' + SLIDE;
var SLIDE_ACTIVE_SEL = SLIDE_SEL + ACTIVE_SEL;
var SLIDES_WRAPPER = 'fp-slides';
var SLIDES_WRAPPER_SEL = '.' + SLIDES_WRAPPER;
var SLIDES_CONTAINER = 'fp-slidesContainer';
var SLIDES_CONTAINER_SEL = '.' + SLIDES_CONTAINER;
var TABLE = 'fp-table';
// slide nav
var SLIDES_NAV = 'fp-slidesNav';
var SLIDES_NAV_SEL = '.' + SLIDES_NAV;
var SLIDES_NAV_LINK_SEL = SLIDES_NAV_SEL + ' a';
var SLIDES_ARROW = 'fp-controlArrow';
var SLIDES_ARROW_SEL = '.' + SLIDES_ARROW;
var SLIDES_PREV = 'fp-prev';
var SLIDES_PREV_SEL = '.' + SLIDES_PREV;
var SLIDES_ARROW_PREV = SLIDES_ARROW + ' ' + SLIDES_PREV;
var SLIDES_ARROW_PREV_SEL = SLIDES_ARROW_SEL + SLIDES_PREV_SEL;
var SLIDES_NEXT = 'fp-next';
var SLIDES_NEXT_SEL = '.' + SLIDES_NEXT;
var SLIDES_ARROW_NEXT = SLIDES_ARROW + ' ' + SLIDES_NEXT;
var SLIDES_ARROW_NEXT_SEL = SLIDES_ARROW_SEL + SLIDES_NEXT_SEL;
var $window = $(window);
var $document = $(document);
$.fn.fullpage = function(options) {
//only once my friend!
if($('html').hasClass(ENABLED)){ displayWarnings(); return; }
// common jQuery objects
var $htmlBody = $('html, body');
var $body = $('body');
var FP = $.fn.fullpage;
// Creating some defaults, extending them with any options that were provided
options = $.extend({
//navigation
menu: false,
anchors:[],
lockAnchors: false,
navigation: false,
navigationPosition: 'right',
navigationTooltips: [],
showActiveTooltip: false,
slidesNavigation: false,
slidesNavPosition: 'bottom',
scrollBar: false,
hybrid: false,
//scrolling
css3: true,
scrollingSpeed: 700,
autoScrolling: true,
fitToSection: true,
fitToSectionDelay: 1000,
easing: 'easeInOutCubic',
easingcss3: 'ease',
loopBottom: false,
loopTop: false,
loopHorizontal: true,
continuousVertical: false,
continuousHorizontal: false,
scrollHorizontally: false,
interlockedSlides: false,
dragAndMove: false,
offsetSections: false,
resetSliders: false,
fadingEffect: false,
normalScrollElements: null,
scrollOverflow: false,
scrollOverflowReset: false,
scrollOverflowHandler: $.fn.fp_scrolloverflow ? $.fn.fp_scrolloverflow.iscrollHandler : null,
scrollOverflowOptions: null,
touchSensitivity: 5,
normalScrollElementTouchThreshold: 5,
bigSectionsDestination: null,
//Accessibility
keyboardScrolling: true,
animateAnchor: true,
recordHistory: true,
//design
controlArrows: true,
controlArrowColor: '#fff',
verticalCentered: true,
sectionsColor : [],
paddingTop: 0,
paddingBottom: 0,
fixedElements: null,
responsive: 0, //backwards compabitility with responsiveWiddth
responsiveWidth: 0,
responsiveHeight: 0,
responsiveSlides: false,
parallax: false,
parallaxOptions: {
type: 'reveal',
percentage: 62,
property: 'translate'
},
//Custom selectors
sectionSelector: SECTION_DEFAULT_SEL,
slideSelector: SLIDE_DEFAULT_SEL,
//events
afterLoad: null,
onLeave: null,
afterRender: null,
afterResize: null,
afterReBuild: null,
afterSlideLoad: null,
onSlideLeave: null,
afterResponsive: null,
lazyLoading: true
}, options);
//flag to avoid very fast sliding for landscape sliders
var slideMoving = false;
var isTouchDevice = navigator.userAgent.match(/(iPhone|iPod|iPad|Android|playbook|silk|BlackBerry|BB10|Windows Phone|Tizen|Bada|webOS|IEMobile|Opera Mini)/);
var isTouch = (('ontouchstart' in window) || (navigator.msMaxTouchPoints > 0) || (navigator.maxTouchPoints));
var container = $(this);
var windowsHeight = $window.height();
var isResizing = false;
var isWindowFocused = true;
var lastScrolledDestiny;
var lastScrolledSlide;
var canScroll = true;
var scrollings = [];
var controlPressed;
var startingSection;
var isScrollAllowed = {};
isScrollAllowed.m = { 'up':true, 'down':true, 'left':true, 'right':true };
isScrollAllowed.k = $.extend(true,{}, isScrollAllowed.m);
var MSPointer = getMSPointer();
var events = {
touchmove: 'ontouchmove' in window ? 'touchmove' : MSPointer.move,
touchstart: 'ontouchstart' in window ? 'touchstart' : MSPointer.down
};
var scrollBarHandler;
// taken from https://github.com/udacity/ud891/blob/gh-pages/lesson2-focus/07-modals-and-keyboard-traps/solution/modal.js
var focusableElementsString = 'a[href], area[href], input:not([disabled]), select:not([disabled]), textarea:not([disabled]), button:not([disabled]), iframe, object, embed, [tabindex="0"], [contenteditable]';
//timeouts
var resizeId;
var afterSectionLoadsId;
var afterSlideLoadsId;
var scrollId;
var scrollId2;
var keydownId;
var originals = $.extend(true, {}, options); //deep copy
displayWarnings();
//easeInOutCubic animation included in the plugin
$.extend($.easing,{ easeInOutCubic: function (x, t, b, c, d) {if ((t/=d/2) < 1) return c/2*t*t*t + b;return c/2*((t-=2)*t*t + 2) + b;}});
/**
* Sets the autoScroll option.
* It changes the scroll bar visibility and the history of the site as a result.
*/
function setAutoScrolling(value, type){
//removing the transformation
if(!value){
silentScroll(0);
}
setVariableState('autoScrolling', value, type);
var element = $(SECTION_ACTIVE_SEL);
if(options.autoScrolling && !options.scrollBar){
$htmlBody.css({
'overflow' : 'hidden',
'height' : '100%'
});
setRecordHistory(originals.recordHistory, 'internal');
//for IE touch devices
container.css({
'-ms-touch-action': 'none',
'touch-action': 'none'
});
if(element.length){
//moving the container up
silentScroll(element.position().top);
}
}else{
$htmlBody.css({
'overflow' : 'visible',
'height' : 'initial'
});
setRecordHistory(false, 'internal');
//for IE touch devices
container.css({
'-ms-touch-action': '',
'touch-action': ''
});
//scrolling the page to the section with no animation
if (element.length) {
$htmlBody.scrollTop(element.position().top);
}
}
}
/**
* Defines wheter to record the history for each hash change in the URL.
*/
function setRecordHistory(value, type){
setVariableState('recordHistory', value, type);
}
/**
* Defines the scrolling speed
*/
function setScrollingSpeed(value, type){
setVariableState('scrollingSpeed', value, type);
}
/**
* Sets fitToSection
*/
function setFitToSection(value, type){
setVariableState('fitToSection', value, type);
}
/**
* Sets lockAnchors
*/
function setLockAnchors(value){
options.lockAnchors = value;
}
/**
* Adds or remove the possibility of scrolling through sections by using the mouse wheel or the trackpad.
*/
function setMouseWheelScrolling(value){
if(value){
addMouseWheelHandler();
addMiddleWheelHandler();
}else{
removeMouseWheelHandler();
removeMiddleWheelHandler();
}
}
/**
* Adds or remove the possibility of scrolling through sections by using the mouse wheel/trackpad or touch gestures.
* Optionally a second parameter can be used to specify the direction for which the action will be applied.
*
* @param directions string containing the direction or directions separated by comma.
*/
function setAllowScrolling(value, directions){
if(typeof directions !== 'undefined'){
directions = directions.replace(/ /g,'').split(',');
$.each(directions, function (index, direction){
setIsScrollAllowed(value, direction, 'm');
});
}
else{
setIsScrollAllowed(value, 'all', 'm');
if(value){
setMouseWheelScrolling(true);
addTouchHandler();
}else{
setMouseWheelScrolling(false);
removeTouchHandler();
}
}
}
/**
* Adds or remove the possibility of scrolling through sections by using the keyboard arrow keys
*/
function setKeyboardScrolling(value, directions){
if(typeof directions !== 'undefined'){
directions = directions.replace(/ /g,'').split(',');
$.each(directions, function (index, direction){
setIsScrollAllowed(value, direction, 'k');
});
}else{
setIsScrollAllowed(value, 'all', 'k');
options.keyboardScrolling = value;
}
}
/**
* Moves the page up one section.
*/
function moveSectionUp(){
var prev = $(SECTION_ACTIVE_SEL).prev(SECTION_SEL);
//looping to the bottom if there's no more sections above
if (!prev.length && (options.loopTop || options.continuousVertical)) {
prev = $(SECTION_SEL).last();
}
if (prev.length) {
scrollPage(prev, null, true);
}
}
/**
* Moves the page down one section.
*/
function moveSectionDown(){
var next = $(SECTION_ACTIVE_SEL).next(SECTION_SEL);
//looping to the top if there's no more sections below
if(!next.length &&
(options.loopBottom || options.continuousVertical)){
next = $(SECTION_SEL).first();
}
if(next.length){
scrollPage(next, null, false);
}
}
/**
* Moves the page to the given section and slide with no animation.
* Anchors or index positions can be used as params.
*/
function silentMoveTo(sectionAnchor, slideAnchor){
setScrollingSpeed (0, 'internal');
moveTo(sectionAnchor, slideAnchor);
setScrollingSpeed (originals.scrollingSpeed, 'internal');
}
/**
* Moves the page to the given section and slide.
* Anchors or index positions can be used as params.
*/
function moveTo(sectionAnchor, slideAnchor){
var destiny = getSectionByAnchor(sectionAnchor);
if (typeof slideAnchor !== 'undefined'){
scrollPageAndSlide(sectionAnchor, slideAnchor);
}else if(destiny.length > 0){
scrollPage(destiny);
}
}
/**
* Slides right the slider of the active section.
* Optional `section` param.
*/
function moveSlideRight(section){
moveSlide('right', section);
}
/**
* Slides left the slider of the active section.
* Optional `section` param.
*/
function moveSlideLeft(section){
moveSlide('left', section);
}
/**
* When resizing is finished, we adjust the slides sizes and positions
*/
function reBuild(resizing){
if(container.hasClass(DESTROYED)){ return; } //nothing to do if the plugin was destroyed
isResizing = true;
windowsHeight = $window.height(); //updating global var
$(SECTION_SEL).each(function(){
var slidesWrap = $(this).find(SLIDES_WRAPPER_SEL);
var slides = $(this).find(SLIDE_SEL);
//adjusting the height of the table-cell for IE and Firefox
if(options.verticalCentered){
$(this).find(TABLE_CELL_SEL).css('height', getTableHeight($(this)) + 'px');
}
$(this).css('height', windowsHeight + 'px');
//adjusting the position fo the FULL WIDTH slides...
if (slides.length > 1) {
landscapeScroll(slidesWrap, slidesWrap.find(SLIDE_ACTIVE_SEL));
}
});
if(options.scrollOverflow){
scrollBarHandler.createScrollBarForAll();
}
var activeSection = $(SECTION_ACTIVE_SEL);
var sectionIndex = activeSection.index(SECTION_SEL);
//isn't it the first section?
if(sectionIndex){
//adjusting the position for the current section
silentMoveTo(sectionIndex + 1);
}
isResizing = false;
$.isFunction( options.afterResize ) && resizing && options.afterResize.call(container);
$.isFunction( options.afterReBuild ) && !resizing && options.afterReBuild.call(container);
}
/**
* Turns fullPage.js to normal scrolling mode when the viewport `width` or `height`
* are smaller than the set limit values.
*/
function setResponsive(active){
var isResponsive = $body.hasClass(RESPONSIVE);
if(active){
if(!isResponsive){
setAutoScrolling(false, 'internal');
setFitToSection(false, 'internal');
$(SECTION_NAV_SEL).hide();
$body.addClass(RESPONSIVE);
$.isFunction( options.afterResponsive ) && options.afterResponsive.call( container, active);
}
}
else if(isResponsive){
setAutoScrolling(originals.autoScrolling, 'internal');
setFitToSection(originals.autoScrolling, 'internal');
$(SECTION_NAV_SEL).show();
$body.removeClass(RESPONSIVE);
$.isFunction( options.afterResponsive ) && options.afterResponsive.call( container, active);
}
}
if($(this).length){
//public functions
FP.version = '2.9.5';
FP.setAutoScrolling = setAutoScrolling;
FP.setRecordHistory = setRecordHistory;
FP.setScrollingSpeed = setScrollingSpeed;
FP.setFitToSection = setFitToSection;
FP.setLockAnchors = setLockAnchors;
FP.setMouseWheelScrolling = setMouseWheelScrolling;
FP.setAllowScrolling = setAllowScrolling;
FP.setKeyboardScrolling = setKeyboardScrolling;
FP.moveSectionUp = moveSectionUp;
FP.moveSectionDown = moveSectionDown;
FP.silentMoveTo = silentMoveTo;
FP.moveTo = moveTo;
FP.moveSlideRight = moveSlideRight;
FP.moveSlideLeft = moveSlideLeft;
FP.fitToSection = fitToSection;
FP.reBuild = reBuild;
FP.setResponsive = setResponsive;
FP.destroy = destroy;
//functions we want to share across files but which are not
//mean to be used on their own by developers
FP.shared ={
afterRenderActions: afterRenderActions
};
init();
bindEvents();
}
function init(){
//if css3 is not supported, it will use jQuery animations
if(options.css3){
options.css3 = support3d();
}
options.scrollBar = options.scrollBar || options.hybrid;
setOptionsFromDOM();
prepareDom();
setAllowScrolling(true);
setAutoScrolling(options.autoScrolling, 'internal');
responsive();
//setting the class for the body element
setBodyClass();
if(document.readyState === 'complete'){
scrollToAnchor();
}
$window.on('load', scrollToAnchor);
}
function bindEvents(){
$window
//when scrolling...
.on('scroll', scrollHandler)
//detecting any change on the URL to scroll to the given anchor link
//(a way to detect back history button as we play with the hashes on the URL)
.on('hashchange', hashChangeHandler)
//when opening a new tab (ctrl + t), `control` won't be pressed when coming back.
.blur(blurHandler)
//when resizing the site, we adjust the heights of the sections, slimScroll...
.resize(resizeHandler);
$document
//Sliding with arrow keys, both, vertical and horizontal
.keydown(keydownHandler)
//to prevent scrolling while zooming
.keyup(keyUpHandler)
//Scrolls to the section when clicking the navigation bullet
.on('click touchstart', SECTION_NAV_SEL + ' a', sectionBulletHandler)
//Scrolls the slider to the given slide destination for the given section
.on('click touchstart', SLIDES_NAV_LINK_SEL, slideBulletHandler)
.on('click', SECTION_NAV_TOOLTIP_SEL, tooltipTextHandler);
//Scrolling horizontally when clicking on the slider controls.
$(SECTION_SEL).on('click touchstart', SLIDES_ARROW_SEL, slideArrowHandler);
/**
* Applying normalScroll elements.
* Ignoring the scrolls over the specified selectors.
*/
if(options.normalScrollElements){
$document.on('mouseenter touchstart', options.normalScrollElements, function () {
setAllowScrolling(false);
});
$document.on('mouseleave touchend', options.normalScrollElements, function(){
setAllowScrolling(true);
});
}
}
/**
* Setting options from DOM elements if they are not provided.
*/
function setOptionsFromDOM(){
var sections = container.find(options.sectionSelector);
//no anchors option? Checking for them in the DOM attributes
if(!options.anchors.length){
options.anchors = sections.filter('[data-anchor]').map(function(){
return $(this).data('anchor').toString();
}).get();
}
//no tooltips option? Checking for them in the DOM attributes
if(!options.navigationTooltips.length){
options.navigationTooltips = sections.filter('[data-tooltip]').map(function(){
return $(this).data('tooltip').toString();
}).get();
}
}
/**
* Works over the DOM structure to set it up for the current fullpage options.
*/
function prepareDom(){
container.css({
'height': '100%',
'position': 'relative'
});
//adding a class to recognize the container internally in the code
container.addClass(WRAPPER);
$('html').addClass(ENABLED);
//due to https://github.com/alvarotrigo/fullPage.js/issues/1502
windowsHeight = $window.height();
container.removeClass(DESTROYED); //in case it was destroyed before initializing it again
addInternalSelectors();
//styling the sections / slides / menu
$(SECTION_SEL).each(function(index){
var section = $(this);
var slides = section.find(SLIDE_SEL);
var numSlides = slides.length;
//caching the original styles to add them back on destroy('all')
section.data('fp-styles', section.attr('style'));
styleSection(section, index);
styleMenu(section, index);
// if there's any slide
if (numSlides > 0) {
styleSlides(section, slides, numSlides);
}else{
if(options.verticalCentered){
addTableClass(section);
}
}
});
//fixed elements need to be moved out of the plugin container due to problems with CSS3.
if(options.fixedElements && options.css3){
$(options.fixedElements).appendTo($body);
}
//vertical centered of the navigation + active bullet
if(options.navigation){
addVerticalNavigation();
}
enableYoutubeAPI();
if(options.scrollOverflow){
scrollBarHandler = options.scrollOverflowHandler.init(options);
}else{
afterRenderActions();
}
}
/**
* Styles the horizontal slides for a section.
*/
function styleSlides(section, slides, numSlides){
var sliderWidth = numSlides * 100;
var slideWidth = 100 / numSlides;
slides.wrapAll('<div class="' + SLIDES_CONTAINER + '" />');
slides.parent().wrap('<div class="' + SLIDES_WRAPPER + '" />');
section.find(SLIDES_CONTAINER_SEL).css('width', sliderWidth + '%');
if(numSlides > 1){
if(options.controlArrows){
createSlideArrows(section);
}
if(options.slidesNavigation){
addSlidesNavigation(section, numSlides);
}
}
slides.each(function(index) {
$(this).css('width', slideWidth + '%');
if(options.verticalCentered){
addTableClass($(this));
}
});
var startingSlide = section.find(SLIDE_ACTIVE_SEL);
//if the slide won't be an starting point, the default will be the first one
//the active section isn't the first one? Is not the first slide of the first section? Then we load that section/slide by default.
if( startingSlide.length && ($(SECTION_ACTIVE_SEL).index(SECTION_SEL) !== 0 || ($(SECTION_ACTIVE_SEL).index(SECTION_SEL) === 0 && startingSlide.index() !== 0))){
silentLandscapeScroll(startingSlide, 'internal');
}else{
slides.eq(0).addClass(ACTIVE);
}
}
/**
* Styling vertical sections
*/
function styleSection(section, index){
//if no active section is defined, the 1st one will be the default one
if(!index && $(SECTION_ACTIVE_SEL).length === 0) {
section.addClass(ACTIVE);
}
startingSection = $(SECTION_ACTIVE_SEL);
section.css('height', windowsHeight + 'px');
if(options.paddingTop){
section.css('padding-top', options.paddingTop);
}
if(options.paddingBottom){
section.css('padding-bottom', options.paddingBottom);
}
if (typeof options.sectionsColor[index] !== 'undefined') {
section.css('background-color', options.sectionsColor[index]);
}
if (typeof options.anchors[index] !== 'undefined') {
section.attr('data-anchor', options.anchors[index]);
}
}
/**
* Sets the data-anchor attributes to the menu elements and activates the current one.
*/
function styleMenu(section, index){
if (typeof options.anchors[index] !== 'undefined') {
//activating the menu / nav element on load
if(section.hasClass(ACTIVE)){
activateMenuAndNav(options.anchors[index], index);
}
}
//moving the menu outside the main container if it is inside (avoid problems with fixed positions when using CSS3 tranforms)
if(options.menu && options.css3 && $(options.menu).closest(WRAPPER_SEL).length){
$(options.menu).appendTo($body);
}
}
/**
* Adds internal classes to be able to provide customizable selectors
* keeping the link with the style sheet.
*/
function addInternalSelectors(){
container.find(options.sectionSelector).addClass(SECTION);
container.find(options.slideSelector).addClass(SLIDE);
}
/**
* Creates the control arrows for the given section
*/
function createSlideArrows(section){
section.find(SLIDES_WRAPPER_SEL).after('<div class="' + SLIDES_ARROW_PREV + '"></div><div class="' + SLIDES_ARROW_NEXT + '"></div>');
if(options.controlArrowColor!='#fff'){
section.find(SLIDES_ARROW_NEXT_SEL).css('border-color', 'transparent transparent transparent '+options.controlArrowColor);
section.find(SLIDES_ARROW_PREV_SEL).css('border-color', 'transparent '+ options.controlArrowColor + ' transparent transparent');
}
if(!options.loopHorizontal){
section.find(SLIDES_ARROW_PREV_SEL).hide();
}
}
/**
* Creates a vertical navigation bar.
*/
function addVerticalNavigation(){
$body.append('<div id="' + SECTION_NAV + '"><ul></ul></div>');
var nav = $(SECTION_NAV_SEL);
nav.addClass(function() {
return options.showActiveTooltip ? SHOW_ACTIVE_TOOLTIP + ' ' + options.navigationPosition : options.navigationPosition;
});
for (var i = 0; i < $(SECTION_SEL).length; i++) {
var link = '';
if (options.anchors.length) {
link = options.anchors[i];
}
var li = '<li><a href="#' + link + '"><span></span></a>';
// Only add tooltip if needed (defined by user)
var tooltip = options.navigationTooltips[i];
if (typeof tooltip !== 'undefined' && tooltip !== '') {
li += '<div class="' + SECTION_NAV_TOOLTIP + ' ' + options.navigationPosition + '">' + tooltip + '</div>';
}
li += '</li>';
nav.find('ul').append(li);
}
//centering it vertically
$(SECTION_NAV_SEL).css('margin-top', '-' + ($(SECTION_NAV_SEL).height()/2) + 'px');
//activating the current active section
$(SECTION_NAV_SEL).find('li').eq($(SECTION_ACTIVE_SEL).index(SECTION_SEL)).find('a').addClass(ACTIVE);
}
/*
* Enables the Youtube videos API so we can control their flow if necessary.
*/
function enableYoutubeAPI(){
container.find('iframe[src*="youtube.com/embed/"]').each(function(){
addURLParam($(this), 'enablejsapi=1');
});
}
/**
* Adds a new parameter and its value to the `src` of a given element
*/
function addURLParam(element, newParam){
var originalSrc = element.attr('src');
element.attr('src', originalSrc + getUrlParamSign(originalSrc) + newParam);
}
/*
* Returns the prefix sign to use for a new parameter in an existen URL.
*
* @return {String} ? | &
*/
function getUrlParamSign(url){
return ( !/\?/.test( url ) ) ? '?' : '&';
}
/**
* Actions and callbacks to fire afterRender
*/
function afterRenderActions(){
var section = $(SECTION_ACTIVE_SEL);
section.addClass(COMPLETELY);
lazyLoad(section);
playMedia(section);
if(options.scrollOverflow){
options.scrollOverflowHandler.afterLoad();
}
if(isDestinyTheStartingSection()){
$.isFunction( options.afterLoad ) && options.afterLoad.call(section, section.data('anchor'), (section.index(SECTION_SEL) + 1));
}
$.isFunction( options.afterRender ) && options.afterRender.call(container);
}
/**
* Determines if the URL anchor destiny is the starting section (the one using 'active' class before initialization)
*/
function isDestinyTheStartingSection(){
var destinationSection = getSectionByAnchor(getAnchorsURL().section);
return !destinationSection || destinationSection.length && destinationSection.index() === startingSection.index();
}
var isScrolling = false;
var lastScroll = 0;
//when scrolling...
function scrollHandler(){
var currentSection;
if(!options.autoScrolling || options.scrollBar){
var currentScroll = $window.scrollTop();
var scrollDirection = getScrollDirection(currentScroll);
var visibleSectionIndex = 0;
var screen_mid = currentScroll + ($window.height() / 2.0);
var isAtBottom = $body.height() - $window.height() === currentScroll;
var sections = document.querySelectorAll(SECTION_SEL);
//when using `auto-height` for a small last section it won't be centered in the viewport
if(isAtBottom){
visibleSectionIndex = sections.length - 1;
}
//is at top? when using `auto-height` for a small first section it won't be centered in the viewport
else if(!currentScroll){
visibleSectionIndex = 0;
}
//taking the section which is showing more content in the viewport
else{
for (var i = 0; i < sections.length; ++i) {
var section = sections[i];
// Pick the the last section which passes the middle line of the screen.
if (section.offsetTop <= screen_mid)
{
visibleSectionIndex = i;
}
}
}
if(isCompletelyInViewPort(scrollDirection)){
if(!$(SECTION_ACTIVE_SEL).hasClass(COMPLETELY)){
$(SECTION_ACTIVE_SEL).addClass(COMPLETELY).siblings().removeClass(COMPLETELY);
}
}
//geting the last one, the current one on the screen
currentSection = $(sections).eq(visibleSectionIndex);
//setting the visible section as active when manually scrolling
//executing only once the first time we reach the section
if(!currentSection.hasClass(ACTIVE)){
isScrolling = true;
var leavingSection = $(SECTION_ACTIVE_SEL);
var leavingSectionIndex = leavingSection.index(SECTION_SEL) + 1;
var yMovement = getYmovement(currentSection);
var anchorLink = currentSection.data('anchor');
var sectionIndex = currentSection.index(SECTION_SEL) + 1;
var activeSlide = currentSection.find(SLIDE_ACTIVE_SEL);
var slideIndex;
var slideAnchorLink;
if(activeSlide.length){
slideAnchorLink = activeSlide.data('anchor');
slideIndex = activeSlide.index();
}
if(canScroll){
currentSection.addClass(ACTIVE).siblings().removeClass(ACTIVE);
$.isFunction( options.onLeave ) && options.onLeave.call( leavingSection, leavingSectionIndex, sectionIndex, yMovement);
$.isFunction( options.afterLoad ) && options.afterLoad.call( currentSection, anchorLink, sectionIndex);
stopMedia(leavingSection);
lazyLoad(currentSection);
playMedia(currentSection);
activateMenuAndNav(anchorLink, sectionIndex - 1);
if(options.anchors.length){
//needed to enter in hashChange event when using the menu with anchor links
lastScrolledDestiny = anchorLink;
}
setState(slideIndex, slideAnchorLink, anchorLink, sectionIndex);
}
//small timeout in order to avoid entering in hashChange event when scrolling is not finished yet
clearTimeout(scrollId);
scrollId = setTimeout(function(){
isScrolling = false;
}, 100);
}
if(options.fitToSection){
//for the auto adjust of the viewport to fit a whole section
clearTimeout(scrollId2);
scrollId2 = setTimeout(function(){
//checking it again in case it changed during the delay
if(options.fitToSection &&
//is the destination element bigger than the viewport?
$(SECTION_ACTIVE_SEL).outerHeight() <= windowsHeight