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jQuery scrollTop animate

css
.head {
width: 100%;
left: 0px;
top: 0px;
height: 76px;
border-bottom: 1px solid #e6e6e6;
position: fixed;
display: flex;
background: #fff;
z-index: 10;
}
Javascript
$(window).scroll(function () {
const height = $(document).scrollTop();
console.log(height);
if (height > 0) {
console.log("no 0");
$("#tt-body-index .head").animate(
{
marginTop: 0,
},
1000,
"swing"
);
} else if (height === 0) {
console.log("0");
$("#tt-body-index .head").animate(
{
marginTop: -76,
},
1000,
"swing"
);
}
});
I'm writing a script using jQuery.
When scrolling starts .head appears and tries to make scrollTop 0 disappear.
.head appearing is good, but when scrollTop is zero, it doesn't become marginTop: -76.

Use CSS transitions and animation whenever possible which is more smooth compared to jquery animations, this can be done using css transition check the below code. Also, one thing you need to trigger scroll on page load in case if the browser scrolls the page to some part from the cache.
CSS
.head {
width: 100%;
left: 0px;
top: -80px;
height: 76px;
border-bottom: 1px solid #e6e6e6;
position: fixed;
display: flex;
background: #fff;
z-index: 10;
background-color: aqua;
transition: top 1s;
}
body.showHeader .head{
top: 0px;
}
Javascript
$(window).scroll(function () {
const height = $(document).scrollTop();
console.log(height);
if (height < 76) {
$('body').removeClass('showHeader')
} else {
$('body').addClass('showHeader')
}
}).scroll();

hide a div after certain percent of scrolling

I have a div which have two CTA buttons.I'm going to hide this div after reaching 90% of the page or reaching to my #footer div. The reason i'm doing this is to prevent it from interfering with footer.
I had found some codes but it will hide the div after 800px scroll not based on percentage .
$(document).scroll(function() {
var y = $(this).scrollTop();
if (y > 800) {
$('.bottomMenu').fadeIn();
} else {
$('.bottomMenu').fadeOut();
}
});
body {
height: 1600px;
}
.bottomMenu {
display: none;
position: fixed;
bottom: 0;
width: 100%;
height: 60px;
border-top: 1px solid #000;
background: red;
z-index: 1;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="bottomMenu"></div>
Any idea?

hide this div after reaching 90% of the page:
You need to get 90% with Math.round($(document).height() * 90 / 100)
var height = Math.round($(document).height() * 90 / 100);
$(document).scroll(function() {
var y = $(this).scrollTop();
if (y > height) {
$('.bottomMenu').fadeIn();
} else {
$('.bottomMenu').fadeOut();
}
});
body {
height: 1600px;
}
.bottomMenu {
display: none;
position: fixed;
bottom: 0;
width: 100%;
height: 60px;
border-top: 1px solid #000;
background: red;
z-index: 1;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="bottomMenu"></div>
or reaching to my #footer div
You need to use offset().top for getting element offset from window:
var height = Math.round($('#footer').offset().top);
$(document).scroll(function() {
var y = $(this).scrollTop();
if (y > height) {
$('.bottomMenu').fadeIn();
} else {
$('.bottomMenu').fadeOut();
}
});
body {
height: 1600px;
}
.bottomMenu {
display: none;
position: fixed;
bottom: 0;
width: 100%;
height: 60px;
border-top: 1px solid #000;
background: red;
z-index: 1;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="bottomMenu"></div>
<div style="height:1000px;"></div>
<div id="footer"></div>

Here I have converted it in Percentage. Update PER value to update config.
//PER is Percentage value
var PER = 90;
var yInPixel, totalHeight;
//If page if with dynamic height change totalHeight and yInPixel after Resize Event
$(document).ready(function() {
totalHeight = $(this).height();
yInPixel = totalHeight * (PER / 100) - window.innerHeight;
});
$(document).scroll(function() {
var y = $(this).scrollTop();
if (y > yInPixel) {
$('.bottomMenu').fadeIn();
} else {
$('.bottomMenu').fadeOut();
}
});
body {
height: 1600px;
}
.bottomMenu {
display: none;
position: fixed;
bottom: 0;
width: 100%;
height: 60px;
border-top: 1px solid #000;
background: red;
z-index: 1;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="bottomMenu"></div>

Changing Div content of fixed div using jquery scrollify

I have a fixed DIV and 3 sections A,B,C.
I'm using jquery scrollify for changing data of sections and I want to change specific div data on scroll of mouse wheel.
As you know, scrollify allow us to scroll a section on mouse wheel rotation, when section change I need to update that fixed div data withn respective section contents
section height and width will be screen height and screen width,
I asked almost the same question with using scrollify website example and I didnt get any response, so I decided to ask again with graphical example

This is parallax what you need to do is to look at this example
http://codepen.io/hudsonmarinho/pen/FHGeK
function scrollFooter(scrollY, heightFooter)
{
console.log(scrollY);
console.log(heightFooter);
if(scrollY >= heightFooter)
{
$('footer').css({
'bottom' : '0px'
});
}
else
{
$('footer').css({
'bottom' : '-' + heightFooter + 'px'
});
}
}
$(window).load(function(){
var windowHeight = $(window).height(),
footerHeight = $('footer').height(),
heightDocument = (windowHeight) + ($('.content').height()) + ($('footer').height()) - 20;
// Definindo o tamanho do elemento pra animar
$('#scroll-animate, #scroll-animate-main').css({
'height' : heightDocument + 'px'
});
// Definindo o tamanho dos elementos header e conteúdo
$('header').css({
'height' : windowHeight + 'px',
'line-height' : windowHeight + 'px'
});
$('.wrapper-parallax').css({
'margin-top' : windowHeight + 'px'
});
scrollFooter(window.scrollY, footerHeight);
// ao dar rolagem
window.onscroll = function(){
var scroll = window.scrollY;
$('#scroll-animate-main').css({
'top' : '-' + scroll + 'px'
});
$('header').css({
'background-position-y' : 50 - (scroll * 100 / heightDocument) + '%'
});
scrollFooter(scroll, footerHeight);
}
});
#scroll-animate
{
overflow: hidden;
}
#scroll-animate-main
{
width: 100%;
left: 0;
position: fixed;
}
#heightPage,
#heightScroll
{
width: 10px;
top: 0;
position: absolute;
z-index: 99;
}
#heightPage
{
left: 0;
}
#heightScroll
{
right: 0;
}
header
{
width: 100%;
height: 100%;
background: url(https://raw.githubusercontent.com/hudsonmarinho/header-and-footer-parallax-effect/master/assets/images/bg-header.jpg) no-repeat 50% 50%;
top: 0;
position: fixed;
z-index: -1;
}
footer
{
width: 100%;
height: 300px;
background: gray;
bottom: -300px;
position: fixed;
z-index: -1;
}
.content
{
height: 1000px;
min-height: 1000px;
background: #ededed;
position: relative;
z-index: 1;
}
.wrapper-parallax {
margin-top: 100%;
margin-bottom: 300px;
box-shadow: 0px 0px 20px rgba(0, 0, 0, 0.5);
}
h1{
width: 100%;
height: 100%;
padding: 0;
margin: 0;
text-transform: uppercase;
text-align: center;
font-family: Helvetica;
font-size: 150px;
color: #fff;
}
header h1{}
.content h1{
line-height: 1000px;
color: #999;
}
footer h1
{
line-height: 300px;
}
header,
footer,
#scroll-animate-main
{
-webkit-transition-property: all;
-moz-transition-property: all;
transition-property: all;
-webkit-transition-duration: 0.4s;
-moz-transition-duration: 0.4s;
transition-duration: 0.4s;
-webkit-transition-timing-function: cubic-bezier(0, 0, 0, 1);
-moz-transition-timing-function: cubic-bezier(0, 0, 0, 1);
transition-timing-function: cubic-bezier(0, 0, 0, 1);
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="scroll-animate">
<div id="scroll-animate-main">
<div class="wrapper-parallax">
<header>
<h1>Header</h1>
</header>
<section class="content">
<h1>Content</h1>
</section>
<footer>
<h1>Footer</h1>
</footer>
</div>
</div>
</div>

Fixed Header when the Div above is scrolled past

I have this setup so that when the page is scrolled 400px the #headermenu becomes fixed. However the div above this one will have a variable height depending on the screen size.
I need the JS to make the #headermenu become fixed when the bottom of the div above it(#mixedheightheader) has reached the top of the window.
JSFIDDLE
Thanks in advance for you help
<div id="mixedheightheader"></div>
$(function() {    
$('#headermenu');
});
$(window).scroll(function() {    
if ($(document).scrollTop() < 400)     {        
if ($('#headermenu'))         {            
$('#headermenu');            
$('#headermenu').stop().css({
top: '0',
position: 'relative'
});        
}    
}    
else     {        
if ($('#headermenu'))         {            
$('#headermenu');            
$('#headermenu').stop().css({
top: '0',
position: 'fixed'
});        
}      
}
});
body {
height: 3000px
}
#headermenu {
width: 100%;
background: black;
min-height: 100px;
}
#mixedheightheader {
top: 0;
bottom: 0;
width: 100%;
height: 100vh;
min-height: 200px;
overflow: hidden;
background: grey;
clear: both;
}
#below {
width: 100%;
background: darkgrey;
height: 100px;
position: relative;
z-index: -1;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="mixedheightheader"></div>
<div id="headermenu"></div>
<div id="below"></div>

I have updated you fiddle:
https://jsfiddle.net/yLon2oj3/11/
$(function() {    
var isFixed = false; //This is to not fix if already fixed and reverse
$(window).scroll(function() {
var mixedHeightHeader = $('#mixedheightheader');
//This uses the offset top position and the height to calculate the bottom of your variable header
var mixedHeightHeaderBottom = mixedHeightHeader.offset().top + mixedHeightHeader.height();
var headerMenu = $('#headermenu');
if ($(document).scrollTop() < mixedHeightHeaderBottom && isFixed)     {        
if (headerMenu) {                  
headerMenu.css({
top: '0',
position: 'relative'
});  
isFixed = false;
//this is to remove the placeholder space of the fixed top nav, when its not fixed to top
mixedHeightHeader.css('margin-bottom', '0');
}    
}    
else  if ($(document).scrollTop() > mixedHeightHeaderBottom && !isFixed)   {        
if (headerMenu) {                      
headerMenu.css({
top: '0',
position: 'fixed'
});
//This holds the position that was occupied by the fixed top nav when it was a relative element, because its now taken out of the flow.
mixedHeightHeader.css('margin-bottom', headerMenu.height() + 'px');
}
isFixed = true;
}
});
});

How to set a div as background?

I've found something interesting on this link. But I can't figure out how to make it and I want to know if anyone has any idea how. So what I realised on this is that even if you resize de browser window the elements keep floating but somehow the only focused element here is the webpage not the floating divs from left and right. This is what I've tried https://jsfiddle.net/eoopvgmc/9/ but the only thing that is working is those floating elements.
Here is what I want to know how to do it http://demo.inskinmedia.com/cds/show.php?live=uxtxbpwvx&ismState=1
(function($) {
var element = $('.left-zone'),
originalY = element.offset().top;
var topMargin = 0;
element.css('position', 'relative');
$(window).on('scroll', function(event) {
var scrollTop = $(window).scrollTop();
element.stop(false, false).animate({
top: scrollTop < originalY ? 0 : scrollTop - originalY + topMargin
});
});
})(jQuery);
(function($) {
var element = $('.right-zone'),
originalY = element.offset().top;
var topMargin = 0;
element.css('position', 'relative');
$(window).on('scroll', function(event) {
var scrollTop = $(window).scrollTop();
element.stop(false, false).animate({
top: scrollTop < -250 ? -250 : scrollTop - originalY + topMargin
});
});
})(jQuery);

Just add a div with a fixed width to wrap them
Edit: Changed the code to fit the request ->
$(document).ready(function() {
$(document).on('scroll', function() {
$('.ads').css({
'top': $(window).scrollTop() + 'px'
});
})
});
body {
margin: 0;
}
.wrapper {
position: relative;
width: 500px;
margin: 0 auto;
}
.main_content {
background: blue;
float: left;
height: 1500px;
width: 500px;
}
.top_banner {
background: orange;
float: left;
height: 250px;
width: 500px;
}
.left-zone,
.right-zone {
position: absolute;
top: 0;
width: 224px;
height: 284px;
transition: top 0.8s;
}
.left-zone {
background: yellow;
left: -224px;
}
.right-zone {
background: red;
right: -224px;
top: 0;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="wrapper">
<div class="left-zone ads"></div>
<div class="top_banner"></div>
<div class="main_content"></div>
<div class="right-zone ads"></div>
</div>