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How to change the 'sections' to changeable class or id?

I have this well working code for my onepager, and need to change the target on this. How can I change 'sections' to any class or id?
I tried to add a class like ('.target') but it did not work.
var sections = $('section')
, nav = $('nav')
, nav_height = nav.outerHeight();
$(window).on('scroll', function () {
var cur_pos = $(this).scrollTop();
sections.each(function() {
var top = $(this).offset().top - nav_height,
bottom = top + $(this).outerHeight();
if (cur_pos >= top && cur_pos <= bottom) {
nav.find('a').removeClass('active');
sections.removeClass('active');
$(this).addClass('active');
nav.find('a[href="#'+$(this).attr('id')+'"]').addClass('active');
}
});
});
I need this code to work with class or id to have different targets than sections.
Other solution for me could be also: To add something like (top: -100px;) on scrolling. I have a fixed navigation bar and need the script to leave space on top.

How to keep class active when scrolling with javascript?

I need help figuring out what is going on with my javascript. I have some code that is supposed to make the nav links have an active class when you are on that part of the page, but it's only sort of working for a couple links and it also flickers as you scroll rather than staying active the whole time you're on that part of the page. See the JSFiddle for an example https://jsfiddle.net/7szpuqsr/ -- if you scroll slowly you can see how "home" becomes active for a moment. I am trying to get each link to have the active class when you click it and also while you are on that entire part of the page.
I also have a javascript sticky nav bar and smooth scrolling working so I don't know if possibly any of that is getting in the way? Thanks in advance for help.
Here's the Javascript I'm trying to use for the active class:
var sections = $('section')
, nav = $('nav')
, nav_height = nav.outerHeight();
$(window).on('scroll', function () {
var cur_pos = $(this).scrollTop();
sections.each(function() {
var top = $(this).offset().top - nav_height,
bottom = top + $(this).outerHeight();
if (cur_pos >= top && cur_pos <= bottom) {
nav.find('a').removeClass('active');
sections.removeClass('active');
$(this).addClass('active');
nav.find('a[href="#'+$(this).attr('id')+'"]').addClass('active');
}
});
});
nav.find('a').on('click', function () {
var $el = $(this)
, id = $el.attr('href');
$('html, body').animate({
scrollTop: $(id).offset().top - nav_height
}, 500);
return false;
});

Something like this? I couldn't reproduce the flickering visually on my machine but I can see the class being removed/added constantly on scroll
https://jsfiddle.net/7szpuqsr/1/
Main changes, I added a class to your sections, you have too many sections but with the way your code is meant to work, it's much easier to add a class to the sections, example below
<section id="home" class="section">
var sections = $('.section') to get the section class
updated this part of the js to check for active class
if (cur_pos >= top && cur_pos <= bottom) {
if(!$(this).hasClass("active")) {
nav.find('a').removeClass('active');
sections.removeClass('active');
$(this).addClass('active');
nav.find('a[href="#'+$(this).attr('id')+'"]').addClass('active');
}
}
You can also cache the $(this) into a variable inside of the section loop like
var $this = $(this);
then just use $this for the rest of the loop
here is the doc for hasClass https://api.jquery.com/hasclass/

How to make a navigation sticky when it reached to another top nav

I have two navigation one is on the top and another is in content. I try to make the second sub menu as sticky when it reached to the top menu not the very top offset of browser. But i failed to make it sticky when it scrolled to top. Also how can I add class on on menu item when active 'href' scrolling.
JSfiddle Here
JS Code
$(document).ready(function() {
var $filter = $('.denpen-menu');
var $filterSpacer = $('<div />', {
"class": "filter-drop-spacer",
"height": $filter.outerHeight()
});
if ($filter.size())
{
$(window).scroll(function ()
{
if (!$filter.hasClass('navbar-fixed') && $(window).scrollTop() > $filter.offset().top)
{
$filter.before($filterSpacer);
$filter.addClass("navbar-fixed");
}
else if ($filter.hasClass('navbar-fixed') && $(window).scrollTop() < $filterSpacer.offset().top)
{
$filter.removeClass("navbar-fixed");
$filterSpacer.remove();
}
});
}
});

First we should fetch the starting position of our subNavand store it as "startingPoint"
var startingPoint = $('.stuckMenu').offset().top - 48;
Notice the - 48 part, that's about the height of our main navigation, and a bit less just so it feels better when they touch.
The key part of the logic is this part here:
if (!subNav.hasClass('navbar-fixed') && $(window).scrollTop() > startingPoint)
{
$filter.addClass("navbar-fixed");
}
else if(subNav.hasClass('navbar-fixed') && $(window).scrollTop() < startingPoint)
{
$filter.removeClass("navbar-fixed");
}
Where we ask:
Is our subNav sticky yet? Is the top of the window touching it currently?
Ok its not sticky yet but the window touched it, make it sticky - fixed.
Ok so our subNav is sticky, is the top of the window above the original position of our subNav?
It is above? Ok I do not want it to be sticky any more, so we'll just remove the class.
Check out the example here

How do I add a class to the body using jQuery, scrollTop, and toggleClass

I have a question concerning jQuery's scrollTop functionality, and it's ability to toggle a class based on the amount of vertical scroll.
What I am trying to accomplish is on any page with a "section.banner" class, that after you scroll past the banner a class is applied to the body tag. This will allow me to change the fill colors of several SVGs that are in the site's header, as well as a fixed positioned side nav that is for pagination.
I am terrible at javascript, and have been stuck searching and trying to get this for hours. any help will be greatly appreciated. Here's the code that I'm working with now (CodeKit is telling me it is wrong, which I am not surprised). The value of 200 is just a placeholder and will be calculated by the height of a fluid image. Full disclosure, I have no idea if the brackets and parenthesis are correct.
// Header/Fixed Pagination Banner Scroll Recoloriing (toggle class)
// Check If '.banner' Exists
if( $('section.banner').length > 0) {
$('body').scrollTop(function)()
{
if $(window).scrollTop >= 200 {
$('body').toggleClass('downtown');
return false;
}
}
}

Try something like this :
if( $('section.banner').length > 0) {
$(window).scroll(function() {
{
if ($(window).scrollTop() >= $('section.banner').scrollTop()) {
$('body').toggleClass('downtown');
return false;
}
});
}
UPDATE
There was little mistake in my code : http://jsfiddle.net/t2yp15hq/
var top = $('section.banner').position().top;
if($('section.banner').length > 0) {
$(window).scroll(function() {
if ($(this).scrollTop() >= top) {
$('body').addClass('downtown');
}
else
{
$('body').removeClass('downtown');
}
});
}
It does not work with toogleClass, the background is flashing.
UPDATE
http://codepen.io/anon/pen/wBWzXy
The solution is to recalculate the top when the window is resized :
$(window).resize(function(){
top = $('section.story-intro').offset().top - 90;
});

JQuery Add Class when bottom of div reaches top

I am trying to add a class when the bottom of a div reaches the top of the window, but am not sure of how to do it.
I have managed to add the class when the top of the div gets to the top of the window, but am not having much luck with the bottom of the div.
Code I am using:
$(document).ready(function() {
var menuLinksTop = $('.container').offset().top;
var menuLinks = function(){
var scrollTop = $(window).scrollTop();
if (scrollTop > menuLinksTop) {
$('header').addClass('black-links');
} else {
$('header').removeClass('black-links');
}
};
menuLinks();
$(window).scroll(function() {
menuLinks();
});
Any help is appreciated.

You should use javascript's getBoundingClientRect() method, watch $(window).scroll event, and look at element's rectangle, its bottom value will give you what you need (if it's negative, your element is all the way up)
$(window).scroll(function() {
console.log($("div.watch")[0].getBoundingClientRect());
if ($("div.watch")[0].getBoundingClientRect().bottom < 0)
alert ("i'm out :3");
});
see jsFiddle http://jsfiddle.net/ja5nnbwr/2/

Add the height of the div. Assuming it is the .container :
var menuLinksTop = $('.container').offset().top + $('.container').height();