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Removing and adding class via .js

I'm working on a header banner that is hidden at the start but appears when the user scrolls down on the page. When the user scrolls back up to the top of the page it should disappear again and keep doing it until the user exits (there is an exit button on the banner which adds a cookie so if the user exits it won't show again).
The issue I'm having is that either the banner won't show up again when I scroll back up to the top of the page, or it will just keep showing up even after exiting. I've tried several options but nothing has worked so far.
function desktopHeader() {
$(window).on('scroll', function() {
console.log( $(this).scrollTop() );
});
var $headerBanner = $('.module-header-banner');
$('.close-btn').on("click", function () {
$.cookie("headerbanner", "exit", {expires: 2/24});
$('.module-header-banner').addClass("exit").fadeOut();
});
if($.cookie('headerbanner') == null) {
if($(window).scrollTop() > $('.site-header').height()){
$headerBanner.addClass('active').fadeIn();
}
$(window).scroll(function() {
if($(window).scrollTop() > $('.site-header').height()){
$headerBanner.addClass('active');
} else if($(window).scrollTop() < $('.site-header').height()) {
$headerBanner.removeClass('active');
}
});
}
}
At a loss -- if anyone has any advice would be best appreciated. Thanks!

Try to add your scroll event outside of the click function,
here is a updated code
function desktopHeader() {
$(window).on('scroll', function() {
console.log( $(this).scrollTop() );
});
var $headerBanner = $('.module-header-banner');
$('.close-btn').on("click", function () {
$.cookie("headerbanner", "exit", {expires: 2/24});
$('.module-header-banner').addClass("exit").fadeOut();
});
if($.cookie('headerbanner') == null) {
if($(window).scrollTop() > $('.site-header').height()){
$headerBanner.addClass('active').fadeIn();
}
}
$(window).scroll(function() {
if($(window).scrollTop() > $('.site-header').height()){
$headerBanner.addClass('active');
}
else if($(window).scrollTop() < $('.site-header').height()) {
$headerBanner.removeClass('active');
}
});
}

Unexpected behaviour jquery

I am trying to write a code which fires on element coming into view and also when the element goes out of view
var _2017 = $("#2017").offset().top;
$(window).scroll(function() {
if ($(window).scrollTop() - _2017 > -200) {
jQuery('[id*="_2017"]').each(function(index) {
$(this).delay(200 * index).fadeIn(200);
});
} else {
jQuery('[id*="_2017"]').each(function(index) {
$(this).delay(200 * index).fadeOut(200);
});
}
});
The problem is that jQuery does not target all divs with the id. This code works fine
var _2017 = $("#2017").offset().top;
$(window).scroll(function() {
if ($(window).scrollTop() - _2017 > -200) {
jQuery('[id*="_2017"]').each(function(index) {
$(this).delay(200 * index).fadeIn(200);
});
} else {
}
});
But when I include the code when the element goes out of view. It does not target all divs.
If anyone can help and explain to me what I am doing wrong. Thanks

$(window).width() if statement running when it shouldn't

Hey guys I am having an issue with $(window).width if statements in jQuery. For some reason my function is running even when the window width is smaller than 991 pixels however my if statement states that it should run if the window width is greater than 991.
function ctaFixTop() {
var mn = $("#new-car-offer-cta");
var offerHead = $('#new-car-offer-head');
mns = "new-car-offer-cta-active";
var hdr = 0;
var ctaHeight = $("#new-car-offer-cta").height();
$('.header-wrapper, #top-bar, #new-car-back, #new-car-offer-head').each(function() {
hdr += $(this).outerHeight();
});
if ($(window).width() > 991) {
$(window).scroll(function() {
if ($(this).scrollTop() > hdr) {
offerHead.css('margin-bottom', ctaHeight);
mn.addClass(mns);
} else {
offerHead.css('margin-bottom', 0);
mn.removeClass(mns);
}
});
}
}
$(window).resize(ctaFixTop);
ctaFixTop();
As you can see the ctaFixTop function is being called twice, once on initial load and whenever the window is resized. When I initially load the page with a window width below 991px the function works how it should however if I then increase the windows size past 911px and size it back down under 911px the $(window).scroll function will be called even when it's wrapped in the if statement that states that it should only run if the window width is greater than 991.
Any idea why this might be happening as I have tried trouble shooting this and simply can't understand why the function is being called even with the if statement around it.
Thanks

That is because the scroll event is already attached to the window and you are not removing it. What you need to do is put the
if ($(window).width() > 991) {
inside the .scroll() method like this.
$(window).scroll(function() {
if ($(window).width() > 991) {
if ($(this).scrollTop() > hdr) {
offerHead.css('margin-bottom', ctaHeight);
mn.addClass(mns);
} else {
offerHead.css('margin-bottom', 0);
mn.removeClass(mns);
}
}});

Auto click when user scrolls to the end of the page

I'm trying to create an infinite scroll feature on my site but it isn't working.
My code:
var post = {}
post.load_moreBtn = $('#home_load_more');
if($(window).scrollTop() + $(window).height() == $(document).height()) {
post.load_moreBtn.trigger('click');
}
post.load_moreBtn.on('click', function () {
$(this).html('<img src="' + base_url + 'images/core/loader2.gif"/>');
post.load_more_messages($(this).attr('data-last_id'));
});
If I put an alert in place of the trigger it works,also if I remove the scroll detection bit, the load more works fine. Just can't get it to autoload, please help.

It's easy with jQuery:
$(function(){ //on document ready
$(document).scroll(function (e) { //bind scroll event
var intBottomMargin = 300; //Pixels from bottom when script should trigger
//if less than intBottomMargin px from bottom
if ($(window).scrollTop() >= $(document).height() - $(window).height() - intBottomMargin) {
$("#home_load_more").click(); //trigger click
}
});
});
I bind this in the

How to make a jquery function run when a div is displayed on the screen

In Short:
I am working on a project and I want to run a function when a particular div is displayed on the screen.
Detail:
There is a scroll to top button fixed on the bottom right of the screen in my template. I want to hide that button when someone scroll down to the footer.
Means when someone scroll down to the footer and the top border of the footer is displayed on the screen, I want a function to run which would hide the go to top button.
Please help me out of this problem...

$(document).ready(function() {
var footer = $("footer");
var f_top = footer.position().top;
$(window).scroll(function() {
if ($(window).scrollTop() + $(window).height() >= f_top ) {
footer.hide();
}
else{
footer.show();
}
});
});

Initialize the window to monitoring its scrolling
$(document).ready(function () {
$(window).scroll(function () {
// get the element that you want check scrolling on it
var off = $("your-selector").offset().top;
var top = $(window).scrollTop() + $(window).height();
if (off <= top) {
// do your job
// for example you can call a function like:
my_method_to_invoke();
}
});
});
The function you want to invoke it:
function my_method_to_invoke() {
// TODO
}

I think you'll need to register a scroll listener on the body that checks to see if the footer is in view and perform the hide if so. Something like this...
$(body).scroll(function () {
scrollCheck();
});
var scrollCheck = function () {
var docTop, docBot, elemTop, elemBot;
docTop = $(window).scrollTop;
docBot = docTop + $(window).height();
elemTop = $(<footer element>).offset().top;
elemBot = elemTop + $(<footer element>).height();
if ((elemBottom >= docTop) && (elemTop <= docBot)) {
$(<button element).hide();
}
}