Используйте готовые библиотеки для fullpage скроллинга.
К примеру, fullPage.js
alvarotrigo.com/fullPage
Код сократится в разы:
$(document).ready(function() {
$('#fullpage').fullpage();
});
Да и у него куча настроек:
$(document).ready(function() {
$('#fullpage').fullpage({
//Navigation
menu: '#menu',
lockAnchors: false,
anchors:['firstPage', 'secondPage'],
navigation: false,
navigationPosition: 'right',
navigationTooltips: ['firstSlide', 'secondSlide'],
showActiveTooltip: false,
slidesNavigation: true,
slidesNavPosition: 'bottom',
//Scrolling
css3: true,
scrollingSpeed: 700,
autoScrolling: true,
fitToSection: true,
fitToSectionDelay: 1000,
scrollBar: false,
easing: 'easeInOutCubic',
easingcss3: 'ease',
loopBottom: false,
loopTop: false,
loopHorizontal: true,
continuousVertical: false,
normalScrollElements: '#element1, .element2',
scrollOverflow: false,
touchSensitivity: 15,
normalScrollElementTouchThreshold: 5,
//Accessibility
keyboardScrolling: true,
animateAnchor: true,
recordHistory: true,
//Design
controlArrows: true,
verticalCentered: true,
resize : false,
sectionsColor : ['#ccc', '#fff'],
paddingTop: '3em',
paddingBottom: '10px',
fixedElements: '#header, .footer',
responsiveWidth: 0,
responsiveHeight: 0,
//Custom selectors
sectionSelector: '.section',
slideSelector: '.slide',
//events
onLeave: function(index, nextIndex, direction){},
afterLoad: function(anchorLink, index){},
afterRender: function(){},
afterResize: function(){},
afterSlideLoad: function(anchorLink, index, slideAnchor, slideIndex){},
onSlideLeave: function(anchorLink, index, slideIndex, direction, nextSlideIndex){}
});
});