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Add class after scrolling also need to work on refresh

I have a working script which adds a class to the body after scrolling 80px.
This works but I need it to work too after having already scrolled and then refreshing the page.
So maybe replace the scroll part by position?
// fixed header
$(function() {
$(window).scroll(function() {
var scroll = $(window).scrollTop();
if (scroll >= 80) {
$("body").addClass('fixed');
} else {
$("body").removeClass("fixed");
}
});
});

$(window).scroll will only fire once a scroll event occurs. If you want to check for the scroll position when the page loads, you should do this outside of the $(window).scroll callback, like this:
function updateScroll() {
if ($(window).scrollTop() >= 80) {
$("body").addClass('fixed');
} else {
$("body").removeClass("fixed");
}
}
$(function() {
$(window).scroll(updateScroll);
updateScroll();
});

you're right. you need to check the event and the initial value:
window.addEventListener('load', function() {
var scroll = $(window).scrollTop();
if (scroll >= 80) {
$("body").addClass('fixed');
}
//no removing needed cause refresh did it
});

window.onscroll = function () { scrollFunction() };
function scrollFunction() {
if (document.body.scrollTop > 100 || document.documentElement.scrollTop > 100) {
document.querySelector(".fixed-top").classList.add("headerFix");
} else {
document.querySelector(".fixed-top").classList.remove("headerFix");
}
}

Vertical sliders scroll

I have a problem with a code which I've copied from http://jsfiddle.net/NGj7F/ I placed this code in my HTML file between and I have put every section between
//Set each section's height equals to the window height
$('section').height($(window).height());
/*set the class 'active' to the first element
this will serve as our indicator*/
$('section').first().addClass('active');
/* handle the mousewheel event together with
DOMMouseScroll to work on cross browser */
$(document).on('mousewheel DOMMouseScroll', function (e) {
e.preventDefault();//prevent the default mousewheel scrolling
var active = $('section.active');
//get the delta to determine the mousewheel scrol UP and DOWN
var delta = e.originalEvent.detail < 0 || e.originalEvent.wheelDelta > 0 ? 1 : -1;
//if the delta value is negative, the user is scrolling down
if (delta < 0) {
//mousewheel down handler
next = active.next();
//check if the next section exist and animate the anchoring
if (next.length) {
/*setTimeout is here to prevent the scrolling animation
to jump to the topmost or bottom when
the user scrolled very fast.*/
var timer = setTimeout(function () {
/* animate the scrollTop by passing
the elements offset top value */
$('body, html').animate({
scrollTop: next.offset().top
}, 'slow');
// move the indicator 'active' class
next.addClass('active')
.siblings().removeClass('active');
clearTimeout(timer);
}, 800);
}
} else {
//mousewheel up handler
/*similar logic to the mousewheel down handler
except that we are animate the anchoring
to the previous sibling element*/
prev = active.prev();
if (prev.length) {
var timer = setTimeout(function () {
$('body, html').animate({
scrollTop: prev.offset().top
}, 'slow');
prev.addClass('active')
.siblings().removeClass('active');
clearTimeout(timer);
}, 800);
}
}
});
It works as I want on my website with the exception that every time I arrive at the last section and scroll down again, after that it doesn't work anymore. The same happens when I try to scroll from the first section up. Why does it stop working? Please help!!! And can someone help me to introduce also the up and down arrows to this function? Thanks!!!!!

scroll function not working in IE

I have a jQuery scroll function set up, that when the user scroll beyond 94px the .fixed-header-wrap fades in and there's a class change etc too. This function isn't working on IE browsers though, and the .fixed-header-wrap is showing on document load and not fading out / in etc. My markup below:
//Header Colour Scroll Function
var scroller = true;
$(window).scroll(function () {
if ($(".sector-menu").css('display') == 'none') {
if ($(this).scrollTop() > 94 && scroller) {
$('.fixed-header-wrap').addClass('header-shadow');
$(".fixed-header-wrap").fadeIn('fast');
$('.header-logo').fadeIn('slow');
$('.header-wrap').addClass('header-blue');
scroller = false;
} else if ($(this).scrollTop() < 94 && !scroller) {
$(".fixed-header-wrap").removeClass('header-shadow');
$(".fixed-header-wrap").fadeOut('fast');
$('.header-logo').fadeOut('fast');
$('.header-wrap').removeClass('header-blue');
scroller = true;
}
} else {
if ($(this).scrollTop() > 94 && scroller) {
$('.fixed-header-wrap').addClass('header-shadow');
$(".fixed-header-wrap").fadeIn('fast');
$('.header-wrap').addClass('header-blue');
scroller = false;
} else if ($(this).scrollTop() < 94 && !scroller) {
$(".fixed-header-wrap").removeClass('header-shadow');
$(".fixed-header-wrap").fadeOut('fast');
scroller = true;
}
}
});
Is there any reason for this or changes that can be made to make the desired effect work across all browsers?

Try changing $(window).scroll() to $('html,body').scroll(). It worked for me in a previous project... Let me know if it works.

Why my fix menu in not working smoothly on scrolling.

$(window).scroll(function() {
var windscroll = $(window).scrollTop();
if (windscroll >= 5) {
$('#page-header').addClass('fixed');
} else {
$('#page-header').removeClass('fixed');
}
}).scroll();
Why my fix menu in not working smoothly on scrolling. i am using in my moodle theme frontpage.php or i have to add some thing for smoothness.

You're modifying the DOM too frequently, as $(window).scroll fires multiple times in a single scroll. Consider checking the existence of the class before add or remove it.
$(window).scroll(function() {
var windscroll = $(window).scrollTop();
if (windscroll >= 5) {
if(!$('#page-header').hasClass('fixed')) {
$('#page-header').addClass('fixed');
}
} else {
if(!$('#page-header').hasClass('fixed')) {
$('#page-header').removeClass('fixed');
}
}
});
also, I removed an extra .scroll() call at the end of the script.
Alternatively, you can make use of a jQuery On Screen plugin which will add a pseudo class :onscreen with the div visible in the browser. Codes are as follow:
$(document).scroll(function() {
if($("#page-header").is(':onScreen')) {
console.log("Element appeared on Screen");
if(!$('#page-header').hasClass('fixed')) {
$('#page-header').addClass('fixed');
}
} else {
console.log("Element not on Screen");
if(!$('#page-header').hasClass('fixed')) {
$('#page-header').removeClass('fixed');
}
}
});
See if the plugin fits your needs.

Detect when document is not at top

I want to apply a class once the document isn't at top anymore, i.e. when the user scrolls down. Could someone explain why this isn't working:
if ($(window).scrollTop() != 0) {
// Do stuff
};
For clarification reasons, here's the functionality I'm looking for (the appearing border-bottom on the header): http://doodle.com/bspuhf6cazqpwhwi

window.scrollY is your friend.
function checkScroll() {
if(window.scrollY > 0) {
// add classname
} else {
setTimeout(checkScroll, 300) // check again after 300ms
}
}
checkScroll()

$(window).scroll(function() {
if ($(window).scrollTop() > 0) {
// Do stuff
} else {
// Do other stuff
}
});