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Fade out div upon element scroll not window position

I have the heading fading out according to the scroll position, however I would like to attach the fadeout to when the user scrolls to the sticky navigation bar to create a better effect.
I tried the following but no luck!
<script>
$(".l-subheader.at_bottom").scroll(function() {
$(".l-titlebar-content").css("opacity", 1 - $(".l-subheader.at_bottom").scrollTop() / 220);
});
</script>
Should be pretty straight forward but I'm a JS novice!
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Thanks for your help.

Check if the header becomes position:fixed; then apply the fade effect.
<script>
$(".l-subheader.at_bottom").scroll(function() {
if( $(this).css('position') == 'fixed' )
{
$(".l-titlebar-content").css("opacity", 1 - $(".l-subheader.at_bottom").scrollTop() / 220);
}
});
</script>

Try the Following Demo... Smooth Scroll Header & Subheader
https://jsfiddle.net/pratikgavas/D3DDp/38/
JS Code:-
$(window).on("scroll", function(e) {
if ($(window).scrollTop() >= $("#Header").height()) {
$("#Header").fadeOut(500);
$("#SubHeader").css('top','0px');
}else {
$("#Header").fadeIn(500);
$("#SubHeader").css('top','100px');
}
});

How to make float navbars with JS and CSS?

How can I make my lower navbar to stay in the top when I scrolling down? I mean I want to hide only upper navbar? The lower navbar should take place of upper nav.
I tried to affix function:
$('.navbar-lower').affix({
offset: {top: 50}
});
But my code doesn't work.
Here is my try on jsFiddle: http://jsfiddle.net/hw3gxhhf
How can I fix it?
PS
Also I use jquery.bootstrap-autohidingnavbar.min.js
$("div.navbar-fixed-top").autoHidingNavbar({
"showOnBottom": false,
"showOnUpscroll": false
});

You can always listen for the scroll event, and check the scrollTop value. Once you've reached the 50px threshold, you change the margin-top value:
window.addEventListener('scroll', function(){
if (document.body.scrollTop >= 50) {
$('.navbar-lower').css('margin-top','0px');
} else {
$('.navbar-lower').css('margin-top','50px');
}
})

Try using the .scroll function to addClass of position:fixed;
and z-index:10;
script-
$(window).scroll(function () {
var scrolled = $(window).scrollTop();
var elemTop = $('#move').offset().top;
if (scrolled >= elemTop) {
$('body').addClass('nav-is-fixed');
}
else {
$('body').removeClass('nav-is-fixed');
}
});
css-
.nav-is-fixed #move {
position: fixed;
top: 0;
z-index:10;
}

scrollTop suddenly not working for sticky menu

I had this working with no problems for the entire build of the site. Then, the day I was supposed to launch, the sticky menu stopped working right. The menu is supposed to start at the bottom, scroll to the top, then stick (position: fixed).
Now, it scrolls about 10px and then jumps to the top. Why is the scrollTop distance not calculating correctly?
Live site at [site no longer exists]
Here's the code for the sticky menu. I'm also using JS to set min-height of divs to window height, but haven't included that code here.
$(function(){
var stickyRibbonTop = $('#wrapper-wcf53badf7ebadf7').offset().top;
$(window).scroll(function(){
if( $(window).scrollTop() > stickyRibbonTop ) {
$('#wrapper-wcf53badf7ebadf7').css({position: 'fixed', top: '0px', 'background-image':'url(http://amarshall.360zen.com/wp-content/uploads/2014/07/menu-fade-background2.png)'});
$('#block-bcf53bf14093931c').css({display: 'block'});
} else {
$('#wrapper-wcf53badf7ebadf7').css({position: 'static', top: '0px','background-image':'none'});
$('#block-bcf53bf14093931c').css({display: 'none'});
}
});
});
Thanks in advance for any help! I'm not a JS or jQuery expert yet, so any suggestions for cleaning things up would be appreciated.
NOTE: The site is built on WordPress, so no-conflict mode is in effect.

I think you are initialising the sticky menu function before you set the min-height of $('big-div').
On page load, the menu starts at 54px from the top, and so when you store the offset().top value as stickyRibbonTop, it is stored at 54px. Then on your scroll event you are comparing against this.
Try setting the min-height of the divs first in your code, then run this same script afterwards. The value of stickyRibbonTop should then be correct.
Bear in mind that you will need to reset stickyRibbonTop every time the window.height() is updated, so you should probably make this sticky menu function a named function and call it at the end of the wrapper_height function. something like this:
function stickyNav() {
var stickyRibbonTop = $('#wrapper-wcf53badf7ebadf7').offset().top;
$(window).unbind('scroll', scrollEvent);
$(window).on('scroll', stickyRibbonTop, scrollEvent);
};
function scrollEvent(event) {
var stickyRibbonTop = event.data;
if ($(window).scrollTop() > stickyRibbonTop) {
$('#wrapper-wcf53badf7ebadf7').css({ position: 'fixed', top: '0px', 'background-image': 'url(http://www.adammarshalltherapy.com/wp-content/uploads/2014/07/menu-fade-background2.png)' });
$('#block-bcf53bf14093931c').css({ display: 'block' });
}
else {
$('#wrapper-wcf53badf7ebadf7').css({ position: 'static', top: '0px', 'background-image': 'none' });
$('#block-bcf53bf14093931c').css({ display: 'none' });
}
};
function wrapper_height() {
var height = $(window).height();
var wrapperheight = height - 75;
wrapperheight = parseInt(wrapperheight) + 'px';
$(".bigDiv").css('min-height', wrapperheight);
$("#wrapper-wcf53bad125d7d9a").css('height', wrapperheight);
stickyNav();
}
$(function () {
wrapper_height();
$(window).bind('resize', wrapper_height);
});

Menu bar fixed at top of the page when scrolling is causing content underneath to jump during scroll

I'm trying to have a submenu stay at the top of the page while scrolling once it reaches the top during scrolling. Here is what I have so far:
$(window).scroll(function () {
if ($(window).scrollTop() > 175) {
$('#location_menu').css('position', 'fixed').css('top','0px').css('z-index','1000');
$('.first').css('padding-top','415');}
else {
$('#location_menu').css('position', 'relative').css('z-index','1');
}});
The issue I'm having is that the scroll is not smooth and once the element changes from position:relative to position:fixed the content seems to jump/skip up about 415px which is the same height as the submenu.
Here is the css:
<div id="location_menu" >submenu content
</div>
<div id="content" class="location_detail first">content beneath submenu
</div>
I've added the line for .first to have a padding-top of 415px when the page is crolling and reaches within 175px of the top of the page .css('padding-top','415') this doesn't actually seem to be doing anything though. There is no change, so I assume I have executed it incorrectly.
Should I use a different scrolling function then I have listed above?
Here is what I ended up using to fix my problem, based off the code from #Danko :
$(window).scroll(function () {
var $conten = $('.first'),
$menu = $('#location_menu')
scrollpos = $(window).scrollTop();
if (scrollpos >= 175) {
$conten.css('padding-top','365px');
$menu.css('position', 'fixed').css('top','0px').css('z-index','1000');
} else {
$conten.css('padding-top','0');
$menu.css('position', 'fixed').css('position', 'relative').css('z-index','1');
}
});

Edit
Ok now that i understand the question, i did this demo http://codepen.io/anon/pen/BdkLf.
The function in fact is this:
$(window).scroll(function () {
var $menu = $('#location_menu'),
$conten = $('#content'),
scrollpos = $(window).scrollTop();
if (scrollpos >= 175) {
$menu.css( {
"top" : "0",
"position": "fixed",
});
$conten.css('top','375px' );
} else {
$menu.css( {
"position": "relative",
"top" : "175px",
});
$conten.css('top','175px');
}
});
Here 175 is equals to the initial distance from the top and 375 is the addition between the distance and the height of your menu

Fade in header when adding and removing classes with jQuery

I'm designing a nav that has the background bar appear after the user has scrolled down the page a bit. When they scroll back to the top, the bar (background color) disappears. I'm doing it using the instructions over at:
Add/remove class with jquery based on vertical scroll?
It works fine but now I would like to add fading in and out of the bar on scroll. I've tried adding the fadeIn() and fadeOut() methods. Problem is when it fades out, it fades out the whole #nav div! Not just the background colour. Here's the query
$(function() {
//caches a jQuery object containing the header element
var header = $('.noBackground');
$(window).scroll(function() {
var scroll = $(window).scrollTop();
if (scroll >= 500) {
header.removeClass('noBackground').addClass('blackBackground').fadeIn();
} else {
header.removeClass('blackBackground').fadeOut().addClass('noBackground');
}
});
});
Full, HTML, CSS and jQuery on this fiddle

The problem here is your #nav div is hidden when you scroll back to top. It is because the .fadeOut() method hides the matched elements by fading them to transparent. So you you remove .fadeOut() from else condition and it works fine.
Here is the edited code.
$(function() {
//caches a jQuery object containing the header element
var header = $('.noBackground');
$(window).scroll(function() {
var scroll = $(window).scrollTop();
if (scroll >= 500) {
header.removeClass('noBackground').addClass('blackBackground').fadeIn();
} else {
header.removeClass('blackBackground').addClass('noBackground');
}
});
});
Edit:
A simple twist will show the effect:
$(function() {
//caches a jQuery object containing the header element
var header = $('.noBackground');
$(window).scroll(function() {
var scroll = $(window).scrollTop();
if (scroll >= 500) {
if(header.hasClass('noBackground')) {
header.hide();
header.removeClass('noBackground')
.addClass('blackBackground').fadeIn(2000);
}
} else {
if(header.hasClass('blackBackground')) {
header.hide();
header.removeClass('blackBackground')
.addClass('noBackground').fadeIn(2000);
}
}
});
});
Demo Fiddle.

fadeOut() method can be implemented on a jquery element,not on a class..your code is working perfectly fine