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How to modify element upon it exiting "sticky" state?

I've got an element stickied to the bottom of the viewport. I am trying to have it change text upon reaching its "destination", i.e. when it stops sticking.
I found a somewhat relevant solution elsewhere online, but I can't quite get it to work... It almost does the trick, but it only goes into effect once the element comes in contact with the top of the viewport. Whereas I want it to turn pink once it stops sticking, immediately when it touches the blue element.
I've looked around for about a week now and I still can't find a way to make this happen, nor have I had any success through pure trial and error...
Hopefully some of you wizards here know how I can achieve this.
Link to codepen: https://codepen.io/darkwing/pen/WNwVXKx
Please ignore that the element starts out pink below if you don't use the link above.
const el = document.querySelector(".myElement")
const observer = new IntersectionObserver(
([e]) => e.target.classList.toggle("is-pinned", e.intersectionRatio < 1),
{ threshold: [1] }
);
observer.observe(el);
#parent {
height: 2000px;
}
.filler {
background-color: green;
height: 500px;
}
.myElement {
width: 300px;
height: 200px;
background-color: red;
position: sticky;
bottom: 0;
}
.otherElement {
width: 300px;
height: 200px;
background-color: blue;
}
/* styles for when the header is in sticky mode */
.myElement.is-pinned {
background-color: pink;
}
<div id="parent">
<div class="filler"></div>
<div class="myElement"></div>
<div class="otherElement"></div>
</div>

Scroll smoothly by 100px horizontally

Heyjo,
problem: I am looking for a javascript or jQuery code since a week to get an implemented scrollbutton on my website working. The moment I fail is when the button should work multiple times: his task is not so scroll to a dedicated element, it should scroll left by, for instance, 100px. Furthermore the scrolling is supposed to happen smoothly (in other words, animated) in a proper section.
what I tried: til now I tried to fulfill this task with $('#idofsection').animate({scrollLeft: 100}, 800) but obviously it didn't work. The Problem was, one couldn't use it multiple times, it just scrolled to a position in my section. Afterwards I used javascript's scrollBy(100, 0) or scrollLeft += 100px, but unfortunately didn't got it to scroll smoothly.
I hope someone can help me because I spent so much time on this issue without finding a solution. Thanks a lot, Sven

You can use scrollBy(100, 0) just like you tried and add this css property to the viewport where you want to scroll:
scroll-behavior: smooth;
.window{
width: 200px;
height: 100px;
border: 1px red solid;
overflow: hidden;
scroll-behavior: smooth;
}
.container{
width: 1000px;
height: 200px;
}
.buttons{
width: 200px;
display: flex;
flex-direction: row;
justify-content: space-between;
}
<div id="window" class="window">
<div class="container">
fjsdlf jslkd flsakj flksad jflkjsa dlfj slakd jflskad flksdaj lfk sadlkfj asldk fslkad fjlkasd flksa jdlf jsadlkfj slkda jflksadj flksa jdlkfj sadlk jflksadj flksjadflksadj flksdaj flksdaj flksdaflksjdflk sjdalkfj skdal fjlksadj flksa fklsjadfklj sadklfj salkdjf lksadj flksjad lfkj sadlkf jslakdjf lksdaj flkasj flkjsa dlfskal flsa jdas lkfjskad fj
</div>
</div>
<div class="buttons">
<button onclick="document.getElementById('window').scrollBy(-100,0)">
<-
</button>
<button onclick="document.getElementById('window').scrollBy(100,0)">
->
</button>
</div>
Solution also here: JSFiddle

So use the animation properties += to adjust it from current position.
$("#next").click(function(){
$('#foo').stop().animate({scrollLeft: "+=100"}, 800);
return false;
});
div {
width: 200px;
overflow: auto;
padding: 1em;
border: 1px solid black;
}
div p {
width: 1000px;
border: 2px dashed #000;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div id="foo">
<p>TEST</p>
</div>
<button id="next">Next</button>

Scroll to bottom of hidden div?

I have a simple chat JS application, with a div.chat-holder holding all chat messages within a pane on the overall window. I set height of '.chat-holder so it remains fixed in size, and allows for scrolling of all the messages.
<style>
.chat-holder {
height: 30px;
overflow-y: scroll;
}
</style>
<div class="pane">
<div class="chat-holder">
<div class="chat-item">
first msg
</div>
<div class="chat-item">
second msg
</div>
....
<div class="chat-item">
last msg
</div>
</div>
</div>
On page load, I scroll to the bottom by setting the scrollTop of the holder:
var $holder = $('.chat-holder');
$holder.scrollTop($holder[0].scrollHeight);
and this works fine.
Problem occurs when I start with div.pane set to display:none. Ideally, I look to have a separate event to "show/hide" the chat pane, and start with the pane hidden.
When the parent pane is hidden, the .chat-holder scrollHeight is 0, so on load, the hidden pane won't be scrolled to the bottom. Which means when the pane is displayed, the chats are not scrolled to the most recent chats. You can see this in the following snippet: with .pane initially not displayed, scroll isn't set. If you set .pane to start displayed, then scroll works fine.
Is there anyway to "scroll to the bottom" while parent is hidden? (Yes, I know I could do this by detecting when the chat-holder is exposed & then scroll to the bottom, but I'm looking to do it on load.)
$(function() {
var $holder = $('.chat-holder');
$holder.scrollTop($holder[0].scrollHeight);
$('button').click(function() {
$('.pane').toggleClass('active');
});
});
.chat-holder {
height: 30px;
overflow-y: scroll;
border: thin solid black;
}
.chat-item {
font-size: 20px;
}
.pane {
display: none;
}
.pane.active {
display: block;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="pane">
<div class="chat-holder">
<div class="chat-item">first msg</div>
<div class="chat-item">second msg</div>
<div class="chat-item">last msg</div>
</div>
</div>
<button>Toggle pane</button>

You can get creative and use opacity or visibility rules instead of display: none:
$(function() {
var $holder = $('.chat-holder');
$holder.scrollTop($holder[0].scrollHeight);
$('button').click(function() {
$('.pane').toggleClass('active');
});
});
.chat-holder {
height: 30px;
overflow-y: scroll;
border: thin solid black;
}
.chat-item {
font-size: 20px;
}
.pane {
opacity: 0;
position: absolute;
z-index: 1;
}
.pane.active {
opacity: 1;
position: relative;
}
button {
z-index: 2;
position: relative;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="pane">
<div class="chat-holder">
<div class="chat-item">first msg</div>
<div class="chat-item">second msg</div>
<div class="chat-item">last msg</div>
</div>
</div>
<button>Toggle pane</button>

JQuery Hide/Show on Scroll down

I'm new to jquery. I'm trying to write a script that will hide the div "box" and all children. When the user scrolls to the bottom of the page, the div "box" and all children display. For time's sake, we'll say the children are "chamber1", "chamber2" and "chamber 3".
when I hide "box", it only removes that div.
$(document).ready(function() {
$("#box").hide();
});
Apologies for lack of code, but I'm having trouble understanding this lesson and I can't find an exact example of what I'm trying to do through my internet searches.
Thank you!

If you to hide the box when you reach the bottom of the page, you javascript should be as follows:
JAVASCRIPT:
$(document).ready(function() {
$(document).on("scroll", function(){
if ( window.scrollMaxY == window.scrollY ) {
$("#box").hide();
}
})
});
HTML:
<div id="box">
<div>Chamber 1</div>
<div>Chamber 2</div>
<div>Chamber 3</div>
</div>

You should make sure that the div has id "box". If you're working with a div of class "box" then you would use:
$(document).ready(function() {
$(".box").hide();
});

I think this might help you and would be better to understand. A good explantion is given below here with demo.
$(window).scroll(function() {
if ($(window).scrollTop() + $(window).outerHeight() == $(document).outerHeight()) {
//Script for activity on reaching bottom of document
$("#box").fadeOut();
} else // optional
{
$("#box").fadeIn();
}
});
body {
margin: 0px;
width: 100%;
}
.container {
position: relative;
height: 900px;
width: 100%;
background: #fee;
}
#box {
position: fixed;
top: 50px;
left: 0px;
background: lightblue;
height: auto;
padding: 15px;
overflow: hidden;
max-width: 250px;
width: 210px;
}
#box > div {
margin: 5px;
background: #F33636;
padding: 10px;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<div class="container">
</div>
<div id="box">
Box
<hr>
<div class="chamber1">
Chamber 1
</div>
<div class="chamber2">
Chamber 2
</div>
</div>
JSFiddle
You can play around with Fiddle Link.

Place animated footer under other divs

so I wanted an animated footer for my webpage using jquery. There's supposed to be a button which should trigger the animation. I found a nice example for all this, and everything is fine and dandy. Except that the button (including the footer) has this code that makes it stick to the bottom of your web browser, rather than to the bottom of the page. I do [i]not[/i] want it to, like, "scroll" along with the page, I realy want it to be underneath all my other divs. I tried putting it in the div container (which has all my other divs in it as well), but that doesn't seem to work.
Now, (after 2.5 hours of googling) I found out that it might/may/could have something to do with "absolute" positioning in the CSS, so I tried switching some things around such as giving the footer's container a relative position or giving it an "overflow: hidden;" along with the rest a left float but nothing seemed to solve my problem. (I could've done something wrong, not that great with CSS after all :-/)
I hope someone is able/willing to help.
P.S. Here's the example I used:
http://return-true.com/2010/04/jquery-pop-up-footer-version-2/
and here's the code:
Javascript:
jQuery(function($) {
var open = false;
$('#footerSlideButton').click(function () {
if(open === false) {
$('#footerSlideContent').animate({ height: '300px' });
$(this).css('backgroundPosition', 'bottom left');
open = true;
} else {
$('#footerSlideContent').animate({ height: '0px' });
$(this).css('backgroundPosition', 'top left');
open = false;
}
});
});
HTML:
<div id="footerPlacement">
<div id="footerSlideContainer">
<div id="footerSlideButton"></div>
<div id="footerSlideContent">
<div id="footerSlideText">
<h3>Hey! I'm a Sliding Footer</h3>
<p>What's a Sliding Footer? Well I'm a cool little element which can be hidden from view, and revealed when the user wants to see me.</p>
<p>What can you use me for? Well look at all this stuff:</p>
<ul>
<li>Sales information</li>
<li>Important updates</li>
<li>Unobtrusive about panel</li>
<li>Or just a good ol' footer</li>
</ul>
<p>There are obviously many other uses, but these are the few useful ones I can think of.</p>
</div>
</div>
</div>
</div>
CSS:
#footerPlacement {
margin-bottom: 0px;
width: 1000px;
margin-left: auto;
margin-right: auto;
}
#footerSlideContainer {
position: fixed;
margin-left: 0px;
bottom:0px;
width: 1000px;
}
#footerSlideButton {
background: url('../images/footer/footerbtn.png') top left no-repeat transparent;
position: absolute;
top: -55px;
right: 20px;
width:50px;
height:50px;
border: none;
cursor: pointer;
}
#footerSlideContent {
width: 100%;
height: 10px;
background: #251b15;
color: #CCCCCC;
font-size: 0.8em;
border: none;
font-family: DejaVuSansBook, Sans-Serif;
}
#footerSlideText {
padding: 15px 10px 25px 25px;
}
Thanks in advance!

if you change your #footerPlacement to include position:relative, you can change #footerSlideContainer to be position:absolute and then your footer will sit below any content above it.
However you will need to make the content have a min-height of around 350px for the footer to work properly and if your content isn't long enough, the footer won't be at the bottom of the browser.
I also added overflow:hidden to #footerSlideContent. I have made a fiddle to demonstrate:
http://jsfiddle.net/tc6b8/