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Hide Menu on scroll down (but only after 50px)

This script makes it so when you scroll down in a browser the navigation bar disappears/hides behind the header. I was wondering if it was possible if instead it hid as soon as you scrolled down, hiding it after a user scrolls down a certain number of pixels (say 50px) to avoid touchy nav hiding on slightest scroll.
Thanks in advance for any direction.
// Nav scroll test
var prev = 0;
var $window = $(window);
var nav = $('#belowhead');
$window.on('scroll', function(){
var scrollTop = $window.scrollTop();
nav.toggleClass('hidden', scrollTop > prev);
prev = scrollTop;
});

You can put this inside your "window.on('scroll')" function:
if(scrollTop > 50) {
nav.addClass('hidden');
} else {
nav.removeClass('hidden');
}

2019 Update / Adjustment
The following could be useful for anyone else wishing to develop a header that disappears when you scroll down. I just finished making the following for a website I'm creating that required the top header to disappear when the user started scrolling, but then reappear when they start scrolling up; continuously applying this logic if you were to constantly keep scrolling up and down on the website.
For starters, a class is added to my header tag called nav-scrolled when the user scrolls past a certain point - 50px in this case. This new class can then be styled to change the background-color, add a box-shadow etc...
$(function() {
var header = $(".nav-container");
$(window).scroll(function() {
var scroll = $(window).scrollTop();
if (scroll >= 50) {
header.addClass("nav-scrolled");
} else {
header.removeClass("nav-scrolled");
}
})
});
However, this only solved the problem of not being able to edit the headers styles if the user is scrolling from the top of the page - not anywhere on the site - the following fixes this.
var userScroll;
var scrollTop = 0;
var delta = 5;
var navHeight = $('header').outerHeight();
$(window).scroll(function(event){
userScroll = true;
});
setInterval(function() {
if (userScroll) {
hasScrolled();
userScroll = false;
}
}, 250);
The next step for me was to sequentially add and remove classes show-nav and hide-nav that had been styled to display and hide the navigation menu. The following checks whether the user has scrolled (up or down) to a value higher than my delta variable. If the user is beginning to scroll up on the website, the class show-nav is added and the header transitions in from the top of the page. If the user is scrolling down the page the class hide-nav is added, and the header is hidden.
function hasScrolled() {
var st = $(this).scrollTop();
// Ensures a higher scroll than $delta
if(Math.abs(scrollTop - st) <= delta)
return;
// If they scrolled down and are past the navbar, add class .nav-up.
// This is necessary so you never see what is "behind" the navbar.
if (st > scrollTop && st > navHeight){
// Scroll Down
$('header').removeClass('show-nav').addClass('hide-nav');
$('.nav-toggle').removeClass('open');
$('.menu-left').removeClass('collapse');
} else {
// Scroll Up
if(st + $(window).height() < $(document).height()) {
$('header').removeClass('hide-nav').addClass('show-nav');
}
}
scrollTop = st;
}

Auto-scroll embedded window only once when entering viewport. Can't scroll back up

I have an image embedded in a container with a background image to give the effect of scrolling within the page. Initially, I had the scrolling effect take place on page load, with this simple bit of script which worked perfectly.
$(window).on("load", function () {
$(".embedded_scroller_image").animate({ scrollTop: $('.embedded_scroller_image')[0].scrollHeight}, 2500, "easeInOutCubic");
}); // end on load
However, the element is too far down the page now and I want that animation to fire when the element enters 80% of the viewport. That part is also working fine with this code here (I'm using a scroll limiter to improve browser performance)
// limit scroll call for performance
var scrollHandling = {
allow: true,
reallow: function() {
scrollHandling.allow = true;
},
delay: 500 //(milliseconds) adjust to the highest acceptable value
};
$(window).on('scroll', function() {
var flag = true;
if(scrollHandling.allow) { // call scroll limit
var inViewport = $(window).height()*0.8; // get 80% of viewport
$('.embedded_scroller_image').each(function() { // check each embedded scroller
var distance = $(this).offset().top - inViewport; // check when it reaches offset
if ($(window).scrollTop() >= distance && flag === true ) {
$(this).animate({ scrollTop: $(this)[0].scrollHeight}, 2500, "easeInOutCubic"); //animate embedded scroller
flag = false;
}
});
} // end scroll limit
}); // end window scroll function
The problem is this: I want the autoscroll to happen once and then stop. Right now, it works on entering viewport, but if I then try to manually scroll the image, it keeps pushing back down or stutters. You can't get the element to scroll normally. I attempted to use the flag in the code to stop the animation, but couldn't get that to successfully work.
How can I have this animation fire when the element is 80% in the viewport, but then completely stop after one time?
Here is a codepen I mocked up as well http://codepen.io/jphogan/pen/PPQwZL?editors=001 If you scroll down, you will see the image element autoscroll when it enters the viewport, but if you try to then scroll that image up in its container, it won't work.
Thanks!

I have tweaked your script a bit:
// limit scroll call for performance
var scrollHandling = {
allow: true,
reallow: function() { scrollHandling.allow = true; },
delay: 500 //(milliseconds) adjust to the highest acceptable value
};
$(window).on('scroll', function() {
if(scrollHandling.allow) { // call scroll limit
var inViewport = $(window).height()*0.8; // get 80% of viewport
$('.embedded_scroller_image').each(function() { // check each embedded scroller
var distance = $(this).offset().top - inViewport; // check when it reaches offset
if ($(window).scrollTop() >= distance ) {
$(this).animate({ scrollTop: $(this)[0].scrollHeight}, 2500, "easeInOutCubic"); //animate embedded scroller
scrollHandling.allow = false;
}
});
} // end scroll limit
}); // end window scroll function
I have kicked out your flag and simply made use of scrollHandling.allow declared already.
Try if it works for you :)
Cheers!

Add Class only on browser Scroll Up

Is there any way to add class to an element only when someone scrolls the browser page up?
Problem Filide>>
JS
$(window).scroll(function() {
var scroll = $(window).scrollTop();
if (scroll <= 100) {
$(".nav").addClass("darkHeader");
} else {
$(".nav").removeClass("darkHeader");
}
});
Problem is this js add class when scroll-down page. But I want to add class when Scroll Up browser and after that when scroll down class will remove. See Example demo>>

If you want to know whether the user has scrolled up or down you need to track of the last scroll position. Then check if the new scroll position is greater or less than that position. You can then set the classes accordingly
// Script
lastScroll = 0;
$(window).on('scroll',function() {
var scroll = $(window).scrollTop();
if(lastScroll - scroll > 0) {
$(".nav").addClass("darkHeader");
} else {
$(".nav").removeClass("darkHeader");
}
lastScroll = scroll;
});
JSFiddle

fixed menu that is fixed after scrolling past a div

I am creating a fixed position sub-nav menu bar for a responsive site. All the examples I can find of a fixed menu that sticks to top after scrolling are based on a set number of pixels from top.
However, since I am working a responsive site the pixels from top where I need the menu to come in are different based on viewport (on small screens, the menu should appear after more area scrolled down because the content fills are taller area of screen).
I have a working example and am using the following jquery script:
$(document).ready(function(){
$('#navigation a, #fixedbar a').on('click', function(e) {
e.preventDefault();
});
$(window).on('scroll',function() {
var scrolltop = $(this).scrollTop();
if(scrolltop >= 215) {
$('#fixedbar').fadeIn(250);
}
else if(scrolltop <= 210) {
$('#fixedbar').fadeOut(250);
}
});
});
As you can see the fixed bar fades in if more than 215 pixels scrolled from the top. Instead I'd like to have it appear after scrolling past a certain div. That way I know it will come in after user has fully scrolled past the intro text.
Here's my fiddle
Any good examples out there of what I want to do? Or easy way to modify the jquery script? Thanks in advance.

This modification will make it fade in after it passes the static nav
DEMO
var $nav = $("#navigation");
if(scrolltop >= $nav.offset().top + $nav.height()) {
$('#fixedbar').fadeIn(250);
}
else {
$('#fixedbar').fadeOut(250);
}

Demo http://jsfiddle.net/EHhQE/1/
You need to fade out and fade in the navigation when the scroll reaches the bottom and the top of the navigation bar respectively.
var topOfDiv = $('#navigation').position().top;
var bottomOfDiv = $('#navigation').position().top+$('#navigation').outerHeight(true);
And fetched in your code:
$(document).ready(function(){
$('#navigation a, #fixedbar a').on('click', function(e) {
e.preventDefault();
});
$(window).on('scroll',function() {
var scrolltop = $(this).scrollTop();
var topOfDiv = $('#navigation').position().top;
var bottomOfDiv = $('#navigation').position().top+$('#navigation').outerHeight(true);
if(scrolltop >= bottomOfDiv) {
$('#fixedbar').fadeIn(250);
}
else if(scrolltop <= topOfDiv) {
$('#fixedbar').fadeOut(250);
}
});
});

$(document).ready(function ()
{
slider();
});
$(window).scroll(function ()
{
slider();
});
function slider()
{
if (document.body.scrollTop > 208)
$('#fixedMenu').fadeIn(0);
else
$('#fixedMenu').fadeOut(0);
}

jQuery double animation using the jquery easing plugin

I want to implement something like this page does: link
Look at the Clicker box. The box has two animations going on. One for the easeInQuad, then the other animation is for the easeInOutSine.
How can I implement something like that in my own function?
$(function()
{
var iH = window.innerHeight + 80;
var position = $(window).scrollTop();
$(window).scroll(function()
{
var scroll = $(window).scrollTop();
if(scroll > position)
{
$("body").animate(
{
scrollTop: iH
},1000,
"easeInOutQuart")
.animate(
{
scrollTop: parseInt($(window).scrollTop()) - 80
},1000,
"easeInOutQuart");
}
else if(scroll < position)
{
$("body").get(0).scrollTop = 0;
}
position = $(window).scrollTop();
});
});
The second animate doesn't work quite well. But it does scroll it up. But it scroll it up too much not just 80 pixels. It scroll it up to the top, then the animation gets into an infinite loop. After the second .animate it will continue to animate it again and again and again. Non stop.

I think its better to use a toggle effect
http://www.sohtanaka.com/web-design/examples/toggle/

$("body").stop(true)
This will clear all animation Queues on the object.
http://docs.jquery.com/Effects/stop