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Show div after scrollDown then scrollUp to top

I want to show hidden div after scrollDown then scrollUp to top. This means that after I scroll down and then scroll up to top, the hidden div is show.
This is my js, but it's just scrollDown.
$(document).scroll(function() {
let y = $(this).scrollTop();
if (y > 100) {
$('.latest_news').fadeIn();
} else {
$('.latest_news').fadeOut();
}
});
I don't know how to after scrollUp, that div show for me?
Thank you.
Sorry about my English.

$(document).scroll(function() {
if ($(this).scrollTop() === 0 && $(".latest_news").is(":hidden")) {
$(".latest_news").fadeIn();
} else {
$(".latest_news").fadeOut(); // remove this else block if you do not want hidden on every scroll down
}
});

I give you solution.
This is very simple.
You need to know scroll direction.
var lastScrollTop = 0;
$(window).scroll(function(event) {
var st = window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop || 0;
if (st > lastScrollTop) {
// downscroll code
} else {
// upscroll code
}
lastScrollTop = st;
});
reference my blog: https://seunggabi.tistory.com/entry/JS-Browser-get-scroll-direction

How can I control the mouse scroll event and after that do an animation on the html, body?

I'm facing a very strange error, which is animation on body during mouse scroll. I think its happening because of the jQuery event window.scroll. I have tried a lot of things like unbinding of animation on mouse scroll, but nothing works. Below is my code.
$(document).on("scroll", function () {
var lastScrollTop = 0;
var windowHeight = $(window).scrollTop();
var seccion1 = $("#seccion1").height();
var seccion2 = $("#seccion2").offset().top;
var alturaseccion2 = $("#seccion2").height();
//this function returns in which section is the user with the scroll
var localizacion = comprobarSeccion(seccion1, seccion2);
if (windowHeight > lastScrollTop) {
// down scroll
console.log("scrollabajo");
if (localizacion == 1) {
$("html, body").animate({
scrollTop: $("#seccion2").offset().top
}, 2);
$(document).bind("scroll");
} else if (localizacion == 2) {
if (windowHeight >= ((alturaseccion2 * 0.80) + seccion2) && windowHeight <= (alturaseccion2 + seccion2)) {
} else {
}
}
} else {
// up scroll
console.log("scrollarriba");
}
lastScrollTop = windowHeight;
});
´´´

I'm not sure what you are trying to accomplish, but if your trying to trigger an event with a specific scroll value you can use the code below
$(window).scroll(function () {
var scroll = $(window).scrollTop();
if (scroll >= 500) {
alert("scroll is greater than 500 px)
} else if(scroll==500){
alert("scroll has hit 500px");
}
});

How not to execute JavaScript code when the screen has a specific size?

I am using the following to add and remove CSS classes based on the current scroll position:
$(function() {
var header = $(".grid-bar");
$(window).scroll(function() {
var scroll = $(window).scrollTop();
if (scroll >= 400) {
header.addClass("move");
} else {
header.removeClass("move");
}
});
});
But I want to disable the addition and removal of the CSS classes on a screen size smaller than 800px.
I have tried wrapping the code in a resize function but after I do so, it stops responding at all:
$(window).resize(function(){
if ($(window).width() => 800){
var header = $(".grid-bar");
$(window).scroll(function() {
var scroll = $(window).scrollTop();
if (scroll >= 400) {
header.addClass("move");
} else {
header.removeClass("move");
}
});
}
});

As others have mentioned, you have an improper operator for "greater than or equal to". The following is incorrect:
if ($(window).width() => 800) {
// ^^ this operator is wrong
if ($(window).width() >= 800) {
// ^^ it should be like this
Also, you need to bind and unbind the scroll handler whenever the screen size changes. You will need to keep track of whether or not the scroll handler is bound or not. Here is what that looks like:
const $window = $(window);
const $header = $(".grid-bar");
let isBound = false;
const scrollHandler = function() {
const scroll = $window.scrollTop();
if (scroll >= 400) {
header.addClass("move");
} else {
header.removeClass("move");
}
}
$(window).resize(function(){
if ($window.width() >= 800) {
if (!isBound) {
$window.on('scroll', scrollHandler);
isBound = true;
}
} else if (isBound) {
$window.off('scroll', scrollHandler);
isBound = false;
}
});
$window.trigger('resize');
Here is a fiddle: https://jsfiddle.net/1mru359x/5/

How to make two different functions work on window resize

I want to make a sticky banner, which becomes fixed at top when it is scrolled and unsticks at the end of the page. The document height is dependent upon images, that's why I use window load event. I have the following code:
function saleBanner() {
$(window).bind("load", function() {
// Make sale banner fixed-at-top
var s = $('.sale-container');
var pos = s.offset();
var maxTop = $(document).outerHeight() - 828 - s.outerHeight(); // 828 is the total height of site footer and sign up form
function fixedBanner() {
var currentTop = $(window).scrollTop();
if (currentTop >= pos.top && currentTop < maxTop) {
s.attr("style", ""); //kill absolute positioning
s.addClass('fixed-at-top'); //stick it
} else if (currentTop >= maxTop) {
s.removeClass('fixed-at-top'); //un-stick
s.css({bottom: 0}); //set sticker right above the footer
} else {
s.removeClass('fixed-at-top'); //top of page
}
}
$(window).scroll(fixedBanner);
});
}
saleBanner();
I want to make this function work on window resize as well. So I added the following code:
function resizeBanner() {
var viewportWidth = $(window).width();
if (viewportWidth > 767) {
saleBanner();
}
}
I have one more function resizeWindow for mobile menu, which I also need to work on window resize. So when I put this two functions together, they don't work (although they work on window resize separately):
$(window).resize(function(e) {
resizeWindow(e);
resizeBanner(e);
});
Where is my mistake? How can I make both functions work on window resize?
Update: Here is the whole code for resizeWindow function. It's rather long, but may be it would be helpful for the answer.
// Mobile menu
var MQM = 768;
var viewportWidth = $(window).width();
function navSlide() {
var headerHeight = $('.cd-header').height();
$(window).on('scroll', {previousTop: 0}, function () {
var currentTop = $(window).scrollTop();
//check if user is scrolling up
if (currentTop < this.previousTop ) {
//if scrolling up...
if (currentTop > 0 && $('.cd-header').hasClass('is-fixed')) {
$('.cd-header').addClass('is-visible');
} else {
$('.cd-header').removeClass('is-visible is-fixed');
}
} else {
//if scrolling down...
if(!$('.cd-header').hasClass('menu-is-open')) {
$('.cd-header').removeClass('is-visible');
}
if( currentTop > headerHeight && !$('.cd-header').hasClass('is-fixed')) $('.cd-header').addClass('is-fixed');
}
this.previousTop = currentTop;
});
}
// Primary navigation slide-in effect on load
if(viewportWidth < MQM) {
navSlide();
}
function addOverflow() {
$('html').addClass('overflow-hidden');
$('body').addClass('overflow-hidden');
}
function removeOverflow() {
$('html').removeClass('overflow-hidden');
$('body').removeClass('overflow-hidden');
}
function hideHeader() {
$('.cd-header').removeClass('is-fixed is-visible');
}
function hideMenu() {
$('.cd-header').removeClass('menu-is-open is-fixed is-visible');
$('.cd-menu-icon').removeClass('is-clicked');
}
function resizeWindow() {
var viewportWidth = $(window).width();
$(window).off('scroll'); // unbind scroll event
if (viewportWidth > 767) {
if ($('.cd-primary-nav').hasClass('is-visible')) {
if ($('.algolia__search-content').hasClass('algolia__search-content--active')) {
hideMenu();
$('.search-trigger').addClass('is-clicked');
$('.search-header').addClass('is-fixed');
} else {
hideMenu();
if (!$('.js-algolia__input').is(':focus')) {
$('.cd-primary-nav').removeClass('is-visible').one('webkitTransitionEnd otransitionend oTransitionEnd msTransitionEnd transitionend',function(){
removeOverflow();
});
$('.search-trigger').removeClass('is-clicked');
$('.search-header').removeClass('is-fixed');
} else {
$('.search-trigger').addClass('is-clicked');
$('.search-header').addClass('is-fixed');
}
}
} else {
hideHeader();
}
} else {
navSlide();
if ($('.cd-primary-nav').hasClass('is-visible')) {
$('.cd-header').addClass('menu-is-open');
$('.cd-menu-icon').addClass('is-clicked');
$('.search-trigger').removeClass('is-clicked');
$('.search-header').removeClass('is-fixed');
}
}
}

Get the height of a div jquery

I am trying to make a navigation, that sets the "active" class to links whenever it scrolls a specified ammount of pixels. But there is a div on the page, that get's its size based on user interaction.
This is the code for setting the active class.
$(function() {
//caches a jQuery object containing the header element
var header = $(".active");
$(window).scroll(function() {
var scroll = $(window).scrollTop();
if (scroll >=760) {
header.removeClass('active').addClass("active1");
}
else { header.removeClass('active1').addClass('active');}
});
var header1 = $("#work");
$(window).scroll(function() {
var scroll = $(window).scrollTop();
if (scroll >= 759 && scroll < 780) {
header1.removeClass('#work').addClass("active");
} else {
header1.removeClass("active").addClass('#work');
}
});
var header2 = $("#about");
$(window).scroll(function() {
var scroll = $(window).scrollTop();
if (scroll > 779 && scroll < 1450) {
header2.removeClass('#about').addClass("active");
} else {
header2.removeClass("active").addClass('#about');
}
});
var header3 = $("#contact");
$(window).scroll(function() {
var scroll = $(window).scrollTop();
if (scroll > 1449) {
header3.removeClass('#contact').addClass("active");
} else {
header3.removeClass("active").addClass('#contact');
}
});
});
How do I get the height of a div which has it's class set as auto, and then apply it in the code above ?
EDIT: I tried the $('#ID').height(); but it gets the height when the website is loaded, and it doesn't work after any user interacts with the div.

In basically get the height of the DIV
$('#ID').height();
it returns height.

I guess this is what you are looking for
Sample DEMO
if($("#ID").offset().top < $(window).scrollTop() + $(window).outerHeight())
If you create a fiddle possibly can do the same for you
Hope this helps, Thank you