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Fading text+icon when scrolling down. Appears while again on top

I'm trying to create some sort of info "Scroll Down" button (not clickable) which has to be visible while scroll bar is up on top, fade out when scroll down a few pixels and fade back in when up again.
So far I was able to create the arrow and the message so far as well as the fading part.
Here is a fiddle: https://jsfiddle.net/8b3jL7r0/1/
var btn = $("#button");
$(window).scroll(function() {
if ($(window).scrollTop() < 100) {
btn.addClass("show");
} else {
btn.removeClass("show");
}
});
var btn2 = $("#scrolltxt");
$(window).scroll(function() {
if ($(window).scrollTop() < 100) {
btn2.addClass("showx");
} else {
btn2.removeClass("showx");
}
});
The problem with is that the arrow and the info text 'Scroll Down' does not appear right from the beginning, you have to scroll down a bit so they appear on top and then everything works smooth. Any clue how to make them visible right from the first load of the code?
Any idea how could I transfer all this code into one single code module in WordPress and have it work exactly like in the fiddle ? Because I've tried to insert it but it seems to not work at all, nothing appears on the page, not the arrow nor the info text.

I just added the inital classes to both elements:
https://jsfiddle.net/4e2cafju/
<div id="button" class="show"></div>
<div id="scrolltxt" class="showx">scroll down</div>
for 2:
You should be able to put these elements directly into a template. You should be able to add the css to the style sheet. And you could lnk to an external JS file. That would probably be best practice. You could also put all the code into a single page. I'm not sure how your wordpress install / theme is set up.

Jquery navbar animation not working properly

I looked through this website for similar question, but couldn't find any.
So I've been working on a website with bootstrap3 for a little bit now and most of the formatting/design part is done, but have one problem I can't solve myself.
I added Jquery to make the navbar shrinks and changes background color when users scroll down to a certain point.(Thanks to peeps helped me out here)
It kind of works, but the movement of it is really weird.
When load the page, the navbar is already shrunk and background is colored, but when scrolled a little bit it blows up in size and the background disappears, and when scrolled even more to the point where I set Jquery to start working, navbar shrinks back and background color changes again.
It's hard to explain in writing, so please see the website and see what I'm talking about.
Below is the website I'm working on.
Test website
I'm assuming its the Jquery not working when loaded, so the CSS setting supposed to be hidden(shorter navbar height and background color) isn't hidden initially.
Below is the jquery code:
$(document).ready(function(){
$(window).scroll(function () {
if ($(window).scrollTop() > 70) {
$("#top-bar").addClass('animated-header');
} else {
$("#top-bar").removeClass('animated-header'); }
});
$("#clients-logo").owlCarousel({
itemsCustom : false,
pagination : false,
items : 5,
autoplay: true,
})
});
Thanks for the help in advance!

Nice website!
Take a look at your header element, you will see that you already put the animated-header class there which causes the problem. Here is your code:
<header id="top-bar" class="navbar-fixed-top animated-header">
What you can do is simply remove that class, and your script above will help deal with adding/removing this class base on the scrollTop value. Something like this will help:
<header id="top-bar" class="navbar-fixed-top"> <!-- without animated-header -->

We are setting our scroll position back to zero, so this works fine. Add this,
$(document).ready(function () {
$('html,body').animate({
scrollTop : 0
},10);
});
$(document).ready(function () {
$(window).scroll(function(){
if($(window).scrollTop() >= 70){
$("#top-bar").addClass("animated-header");
}
if($(window).scrollTop() <= 70){
$("#top-bar").removeClass("animated-header");
}
});
});

Best Practice for jQuery Compatibility

I've got this jQuery to add a back to top button. It's simple and works very well. I have it running as a plugin in WordPress MultiSite on probably 120 websites. Today I noticed it isn't working on every site. There are no console errors, but my guess is that some other plugin or script is causing a conflict. This is inconsistent from one site to the other and I can't find a reason.
How can I write this jQuery so it doesn't experience compatibility issues?
jQuery(document).ready(function($){
//Check to see if the window is top if not then display button
$(window).scroll(function(){
if ($(this).scrollTop() > 100) {
$(".scrollToTop").fadeIn();
} else {
$(".scrollToTop").fadeOut();
}
});
//Click event to scroll to top
$(".scrollToTop").click(function(){
$("html, body").animate({scrollTop : 0},800);
return false;
});
});
Example site 1: http://anntowergallery.com/exhibits/ Doesn't work.
Example site 2: http://iemajen.com/asphaltanimals/ Works
I've tried this out on a dozen sites or so and cannot pin point what could cause the problem. No errors in console on the gallery website.
I appreciate any feedback.

Strange bug you got there.
Seems that in site 1 you have the following CSS:
body {
overflow-x: hidden;
}
When that CSS is in place, the $(window).scroll event listener won't fire. If you remove that CSS line, the JS works just fine.
You can also bind the scroll event to the body instead of the window:
$("body").scroll(function(){
...
});
But I recall that had some issues with IE. Probably you'd be safest to bind both $("body").scroll and $(window).scroll:
jQuery(document).ready(function($){
//Check to see if the window is top if not then display button
$(window).add("body").scroll(function(){
if ($(this).scrollTop() > 100) {
$(".scrollToTop").fadeIn();
} else {
$(".scrollToTop").fadeOut();
}
});
//Click event to scroll to top
$(".scrollToTop").click(function(){
$("html, body").animate({scrollTop : 0},800);
return false;
});
});

You've got a style element inside the body tag right before your scroll script, which isn't valid and may be preventing the script from executing. Try moving that into the head.
This is the part I'm talking about:
<style type="text/css">
.scrollToTop {
/* ... */
}
</style>

I wouldn't use that code on mobile devices... every tick of the window scroll is firing either a fadeIn or fadeOut. It would be better to add a flag to check if the scroll to top button is visible, or not (demo)
jQuery(document).ready(function($) {
var visible = false;
//Check to see if the window is top if not then display button
$(window).scroll(function() {
var scrollTop = $(this).scrollTop();
if (!visible && scrollTop > 100) {
$(".scrollToTop").fadeIn();
visible = true;
} else if (visible && scrollTop <= 100) {
$(".scrollToTop").fadeOut();
visible = false;
}
});
//Click event to scroll to top
$(".scrollToTop").click(function() {
$("html, body").animate({
scrollTop: 0
}, 800);
return false;
});
});

jQuery - make sticky footer stop at the top of footer and become sticky again on scroll up

I have a form that is sticky on every page, and I need it to stop being sticky when it reaches the top of the footer. I have this working properly, but I need it to become sticky again when scrolling back up the page. Anything glaringly wrong?
$(window).scroll(function(){
var footerTopPos = $('#footer-wrapper').offset().top;
var navBottomPos = $('#footer-form-wrapper').offset().top;
if(navBottomPos >= footerTopPos) {
$('#footer-form-wrapper').addClass('sticky');
} else {
$('#footer-form-wrapper').removeClass('sticky');
}
});
To clarify, the first part works perfectly. The css changes from "fixed" to "absolute" and the form stays in place. The problem is, I want it to revert back to "fixed" when you start scrolling back up the page (my else statement). This part does nothing at all.
Here is a rough jsfiddle to show the issue http://jsfiddle.net/L693f5bg/14/

--Edit--
To keep what you have started with the same and not use any other plugins you have to make sure you are declaring the variable outside the scroll function so that it doesn't get changed every time you scroll and change its position.
$(function () {
var footerTopPos = $('#footer-form-wrapper').offset().top;
$(window).scroll(function () {
var windowTopPos = $(window).scrollTop();
if (windowTopPos >= footerTopPos) {
$('#footer-form-wrapper').css('position', 'absolute');
$('#footer-form-wrapper').css('top', '0');
} else {
$('#footer-form-wrapper').css('position', 'fixed');
$('#footer-form-wrapper').css('bottom', '0');
$('#footer-form-wrapper').css('top', 'auto');
}
});
});
Updated your JSFiddle
Personally I recommend using Waypoints.js and the sticky elements plugin. It does everything and it's super clean and easy to implement. include the jquery.waypoints.js and the sticky plugin then initialize using:
var sticky = new Waypoint.Sticky({
element: $('#footer-wrapper')[0],
offset: '90%',
stuckClass: 'unstuck'
});
I updated the JSFiddle using the Waypoints.js plugin

Applying snap.js to my main content wrapper seems to break *some* of my jQuery functions

I'm using snap.js which enables you to slide your main content div over using css3 and javascript, revealing a menu underneath.
The problem I am having is that when I apply the class snap-content, which tells snap.js which div to slide, that being my main site wrapper, the elements relying on jQuery for their sizing behave unexpectedly.
Here's my situation.
I'm using jQuery to make an element fixed when scrolling past a certain point:
jQuery(document).ready(function ($) {
$(window).scroll(function () {
if ($(this).scrollTop() > 140) {
if ($("#mainMenu").css('position') !== 'fixed') {
$("#mainMenu").css("position", "fixed");
}
} else {
if ($("#mainMenu").css('position') !== 'static') {
$("#mainMenu").css("position", "static");
}
}
});
});
When using snap.js I had to change $(window).scroll to $('#wrapper').scroll because the wrapper is now the scrollable content. I believe this could have something to do with my problem.
When the menu becomes fixed I use some jQuery to keep it the same width as the container it was inside before it became fixed:
jQuery(function ($) {
$(window).resize(_.debounce(function () {
var elementWidth = $('#sidebarWrapper').width();
$('#mainMenu').css('width', elementWidth + 'px');
}, 10));
});
This all works fine before I add the class snap-content, and I can resize the browser without any problems.
When the class is added the sizing no longer works.
There are other functions to do with sizing that start to act unexpectedly too but this is just an example.
I assumed it might be something clashing with my jQuery but I'm using jQuery(function($) so that should stop that right?
snap.js

instead of adding the event to the window scroll add it to the snapcontent since you are scrolling on the snapcontent div instead of the window