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Javascript/jQuery - Accordion onclick need to open only current div not all

I’m trying to build an accordion menu and for some reason I can’t get the accordion to function how I want.
Currently when the user clicks on the accordion div, the hidden-textarea div gets added with an active-accordion class wherever it's referenced.
How do I get the active-accordion class to only be added to the current clicked accordion div? Not all of them. I need to be able to toggle between each accordion div that is clicked.
Any help is gladly appreciated.
Thanks!
HTML
<div class="accordion-block">
<div class="container">
<div class="gallery-wrap">
<div class="item-accordion">
<div class="accordion">
<div class="title text accordion-title”>Title of Accordion</div>
<div class="animation-container">
<div class="hidden-textarea active-accordion”>
<div class="body text”>Lorem Ipsum </div>
<div class="buttonArrayV1”>Click Me</div>
</div>
</div>
</div>
</div>
</div>
</div>
<div class="accordion-block">
<div class="container">
<div class="gallery-wrap">
<div class="item-accordion">
<div class="roles-description accordion">
<div class="title text accordion-title”>Title of Accordion</div>
<div class="animation-container">
<div class="hidden-textarea active-accordion">
<div class="body text”>Lorem Ipsum </div>
<div class="buttonArrayV1”>Click Me</div>
</div>
</div>
</div>
</div>
</div>
</div>
CSS
.active-accordion {
display: block !important;
}
.hidden-textarea {
display: none;
}
JS
TestJs.HorizontalAccordion.prototype.onResize = function() {
$(window).resize(function() {
if ($(window).width() < 1200) {
$('.accordion').on( "click", function(e) {
e.preventDefault();
e.stopPropagation();
$(".hidden-textarea").addClass("active-accordion");
// $('.hidden-textarea').removeClass("active-accordion");
// $('.hidden-textarea').toggle("active-accordion");
return false;
});
}
if ($(window).width() >= 1200) {
}
});
};

Update: I updated the onclick function and am able to toggle successfully. Now I just need to open 1 accordion not all of them.
Any help is gladly appreciated. Thank you.
$('.horizontalAccordionV1 .accordion').on( "click", function() {
event.preventDefault();
// create accordion variables
var accordion = $('.hidden-textarea');
// toggle accordion link open class
accordion.toggleClass("active-accordion");
// toggle accordion content
accordionContent.slideToggle(250);
});

Problem solved! Added this to my JS click function and removed everything else.
$(this).find('.hidden-textarea').toggleClass('active-accordion');

Semantic UI - How do I use sticky in modal window?

I'm using semantic-ui and i'm having a problem with the sticky component.
I can get it to work in a normal page but I can't get it to work in a modal window.
I'm using :
HTML:
<div class="ui modal">
<div class="header">Title</div>
<div class="scrolling content">
<div class="ui sticky">
... content I want to have stick ...
</div>
JS:
$('.ui.sticky')
.sticky('refresh')
;
$('.ui.sticky')
.sticky({
type: 'fixed',
offset: 200
})
;

You're initializing sticky behavior before the element is even visible yet, cause you're using modal , to prevent that from happening, use onVisible callback to start sticky behavior like the following :
[DEMO]
JS(jQuery)
$( document ).ready(function() {
$('.ui.modal').modal('show').modal({
onVisible:$('.ui.sticky').sticky({
type: 'fixed',
offset: 200
}).sticky('refresh')
});
});
HTML
<div class="ui modal">
<div class="header">Title</div>
<div class="scrolling content" style="min-height:1000px">
<div class="ui sticky"> ... content I want to have stick ... </div>
</div>
</div>

How to get dimmer on specific card to toggle rather than all my card gallery using Semantic UI and JQuery

I have a gallery of avatars I want to show my user, which are shown in the card format of Semantic-UI. I want the user to click on one of the images which then triggers Semantic's dimmer to appear in that specific image's place.
What I currently get is that all the images get the dimmer to appear on them instead of the specific one I want. Here is the code that puts the dimmer on all images:
$(".selectavatar img").hover(function() {
$('.selectavatar img').removeClass('selectedImage');
$(this).toggleClass("selectedImage");
});
$(".selectavatar img").click(function() {
$(".ui.dimmer").dimmer("toggle");
});
<!--gallery goes here-->
<div class="ui three column grid selectavatar">
<div class="five wide column">
<div class="ui segment">
<form action="/account/<%=currentUser._id%>?_method=PUT" method="POST">
<input name="user[image]" type"submit" value = "image1.jpg" class="hidden" />
<img name="user[image]" src = "image1.jpg" width=300>
<div class="ui dimmer">
<div class="content">
<div class="center">
<button class="ui button blue" type="Submit">
<i class="user icon"></i> Select Avatar
</button>
</div>
</div>
</div>
</form>
</div>
</div>
<div class="five wide column">
<div class="ui segment">
<form action="/account/<%=currentUser._id%>?_method=PUT" method="POST">
<input name="user[image]" type"submit" value = "image2.png" class="hidden" />
<img name="user[image]" src = "image2.png" width=300>
<div class="ui dimmer">
<div class="content">
<div class="center">
<button class="ui button blue" type="Submit">
<i class="user icon"></i> Select Avatar
</button>
</div>
</div>
</div>
</form>
</div>
</div>
The way I envisioned it was that I'll add the class .selectedImage on the image the user wants, then I would be able to toggle the dimmer if selectedImage exists. But when I do use that as so:
$(".selectavatar img.selectedImage").click(function() {
$(".ui.dimmer").dimmer("toggle");
});
then nothing appears, no dimmer whatsoever!
What am I doing wrong?
As a side note, I need to figure out how to generate a gallery from a folder of images using EJS and NodeJS, instead of having to hard code each image. I guess the right thing to do would be a seperate question for that?

Your code will dim all .ui.dimmer divs when you click an image:
$(".selectavatar img").click(function() {
$(".ui.dimmer").dimmer("toggle");
});
This code will dim only the .ui.dimmer div which is located in the same parent container as the clicked image:
$(".selectavatar img").click(function() {
$(this).parent().find(".ui.dimmer").dimmer("toggle");
});
Part 2
Your code will set a click handler on all img.selectedImage which exist when you set the event handlers. Unfortunately no images have the selectedImage class at that point so it doesn't work.
$(".selectavatar img.selectedImage").click(function() {
//code
});
This code will do the same, but it only requires .selectavatar to exist when the event handler is set up:
$(".selectavatar").on("click", "img.selectedImage", function() {
//code
});

JQuery hide() not persisting after hide event

I'm trying to hide a visible section then show a hidden section using JQuery .hide() and .show(). When the event fires (on clicking an image) it only hides the visible section momentarily, then becomes visible again with the previously hidden section now visible below the first visible section. Based on the docs I've read and some tutorials I've watched this shouldn't be happening.
HTML:
<div class="transition-div">
<section class="project-section">
<div class="project-wrapper" id="project-one">
<div class="desc-text">
<h2>Header</h2>
</div>
<div class="project-image-wrapper">
<img class="project-image" id="project-img-one" src="images/img1.png">
<button class="project-button">Button
</button>
</div>
</div>
</section>
<section class="project-section hidden">
<div class="project-wrapper">
<div class="desc-text">
<h2>Header</h2>
<p>Some description text</p>
</div>
<div class="project-image-wrapper">
<img class="project-image" src="images/img1.png">
</div>
</div>
</section>
</div>
JS:
$('.hidden').hide();
var slideSection = function() {
$('.project-image-wrapper').click(function() {
var $parentDiv = $(this).parents('.transition-div');
var $childToShow = $parentDiv.find('.hidden');
var $childToHide = $childToShow.siblings('.project-section');
$childToHide.hide(300, hideActiveSection());
function hideActiveSection() {
$childToHide.addClass('hidden');
$childToShow.show(300, function() {
$(this).removeClass('hidden');
});
}
});
};
slideSection();
How would I get the section I want to hide to do so persistently until I click the currently visible project image to show it? Could my CSS be interfering with what I want to do here? If so I'll post the code. Thanks!

How to toggle the button backcolor based on selection - Javascript - Semantic UI

I have a section of my web page as below
<div class="ui divided list">
<div class="item">
<div class="ui segment">
<h4 class="ui left">Payment method</h4>
<div class="ui right buttons">
<div class="ui button" ng-bind="item.payment.option1">{{item.payment.option1}}</div>
<div class="or"></div>
<div class="ui button" item.payment.option2>{{item.payment.option2}}</div>
</div>
</div>
</div>
</div>
I get the output 'similar' to the pattern here. But I have not included 'positive' class to the ui button like
<div class="ui positive button">
Because, I dont want any option to be defautly selected. But I want to toggle the colors according to the clicks. Can someone tell me where I can make change?

In your css do something like
.button {
background: silver;
}
.positive {
background: green;
}
So when the new class positive, gets added, it will then take the css background for .positive instead of .button.