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Close dropdown upon clicking another

I a working on a to make a reponsive dropdown navigation bar with vanilla JavaScript. In mobile view I want that upon click one dropdown the another should close. JavaScript here:
dropbtns.forEach(link => {
link.addEventListener("click", function(e) {
e.currentTarget.nextElementSibling.classList.toggle("showdd");
});
});
and show dropdown:
.showdd {
height: auto;
}
html code:
<div class="nav-container">
<div class="brand">
Logo
</div>
<nav>
<div class="nav-mobile"><a id="nav-toggle" href="#!"><span></span></a></div>
<ul id="nav-list">
<li>
Home
</li>
<li>
About
</li>
<li class="dropdown">
</i>
<ul class="nav-dropdown">
<li>
Web Design
</li>
<li>
Web Development
</li>
<li>
Graphic Design
</li>
</ul>
</li>
<li>
Pricing
</li>
<li class="dropdown">
</i>
<ul class="nav-dropdown">
<li>
Web Design
</li>
<li>
Web Development
</li>
<li>
Graphic Design
</li>
</ul>
</li>
<li>
Contact
</li>
</ul>
</nav>
</div>
full code can be find here.

So, if you want to collapse all other .nav-dropdown when one is being clicked on, you simply will need to:
Store the reference of the .nav-dropdown of the current element (for comparison later)
Toggle its class (as you're doing already)
Go through all other .nav-dropdown in your DOM tree and iterate through them. If they do not match the current reference, then you know the dropdown belongs to another link and you can remove the class
With that in mind we arrive at the code below:
dropbtns.forEach(link => {
link.addEventListener('click', e => {
const ownDropdown = e.currentTarget.nextElementSibling;
ownDropdown.classList.toggle('showdd');
document.querySelectorAll('.dropbtn + .nav-dropdown').forEach(el => {
if (el !== ownDropdown)
el.classList.remove('showdd');
});
});
});

It works on your Codepen after I edit the following line.
links.forEach(link => {
link.addEventListener("click", function(e) {
links.forEach(link => {
link.nextElementSibling.classList.remove("showdd"); // Here
});
e.currentTarget.nextElementSibling.classList.toggle("show");
});
});
By the way, what is "showdd"?

Loop through DOM elements with JQuery to assign a click handler

I need to loop through the DOM with JQuery, and add a click handler to multiple parent elements that contain a child that will also be given a slideToggle(). I have the logic working fine when I add the click handlers manually, but now I need to be able to dynamically do this to multiple parent elements.
Here is my HTML:
<div class="map-poi-nav">
<ul class="map-poi-nav-dropdown">
//Parent #1
<li class="sub-menu-link" id="sub-menu-link-1">
<a href="#">
<img src="https://svgshare.com/i/ADc.svg"> Activities
</a>
</li>
<li class="sub-menu">
<ul class="sub-menu-list" id="sub-menu-list-1">
<li><a><span>•</span>Golden State Park</a></li>
<li><a><span>•</span>Sunrise Oaks City Park</a></li>
</ul>
</li>
</ul>
<ul class="map-poi-nav-dropdown">
//Parent #2
<li class="sub-menu-link" id="sub-menu-link-2">
<a href="#">
<img src="https://svgshare.com/i/ADc.svg"> Dining
</a>
</li>
<li class="sub-menu">
<ul class="sub-menu-list" id="sub-menu-list-2">
<li><a><span>•</span>The Loft Grill</a></li>
<li><a><span>•</span>Fish Grill & Bar</a></li>
</ul>
</li>
</ul>
</div>
Basically, you click on .sub-menu-link to slideToggle() .sub-menu-list.
Here is the JS that I have working so far. It targets the id's manually currently, which feels gross:
$('#sub-menu-link-1').click(function() {
$('#sub-menu-list-1').slideToggle(100);
$(this).toggleClass('active-menu-link');
});
$('#sub-menu-link-2').click(function() {
$('#sub-menu-list-2').slideToggle(100);
$(this).toggleClass('active-menu-link');
});
My apologies if this is something very apparent to do in JQuery. I am not at all familiar with it, and it just so happens to be a requirement of this project.

you could simply use below code.
select all list items with class name and add listener. click will be attached to all elements
$('.sub-menu-link').click(function() {
$(this).slideToggle(100);
$(this).toggleClass('active-menu-link');
});

You already have classes, so just use them instead of the ids: use this to refer to the clicked element, .next() to get the next sibling (the li.sub-menu), and .find('.sub-menu-list') to get to the ul you want to toggle:
$('.sub-menu-link').click(function() {
const $subMenuList = $(this).next().find('.sub-menu-list');
console.log($subMenuList.text().trim());
$subMenuList.slideToggle(100);
$(this).toggleClass('active-menu-link');
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="map-poi-nav">
<ul class="map-poi-nav-dropdown">
//Parent #1
<li class="sub-menu-link" id="sub-menu-link-1">
<a href="#">
<img src="https://svgshare.com/i/ADc.svg"> Activities
</a>
</li>
<li class="sub-menu">
<ul class="sub-menu-list" id="sub-menu-list-1">
<li><a><span>•</span>Golden State Park</a></li>
<li><a><span>•</span>Sunrise Oaks City Park</a></li>
</ul>
</li>
</ul>
<ul class="map-poi-nav-dropdown">
//Parent #2
<li class="sub-menu-link" id="sub-menu-link-2">
<a href="#">
<img src="https://svgshare.com/i/ADc.svg"> Dining
</a>
</li>
<li class="sub-menu">
<ul class="sub-menu-list" id="sub-menu-list-2">
<li><a><span>•</span>The Loft Grill</a></li>
<li><a><span>•</span>Fish Grill & Bar</a></li>
</ul>
</li>
</ul>
</div>

You can use jQuery's .next() like so:
$(".sub-menu-link").click(function() {
$(this).next(".sub-menu-link").slideToggle(100);
$(this).toggleClass("active-menu-link");
})
Or you can chain them and use ES6 arrow syntax to make it more concise:
$(".sub-menu-link").click(() => $(this).toggleClass("active-menu-link").next(".sub-menu-link").slideToggle(100));

You should try this if your list and link ids have similiar pattern as in the code you have shown
$('#sub-menu-link').click(function() {
var id = $(this).attr("id").replace("sub-menu-link", "")
$('#sub-menu-list-'+ id).slideToggle(100);
$(this).toggleClass('active-menu-link');
});

To add class="current" Dynamically

I have Menu list which contains Sub-Menu as shown in the code below.
<li class="current">
<span class="icon4"></span>Subscriptions
<ul class="sub-menu">
<li>View Subscriptions
</li>
<li class="#((ViewBag.PageName == " Subscription ") ? "active " : " ")">Manage Subscription Plans
</li>
</ul>
</li>
<li class="current">
<span class="icon5"></span>Administration
<ul class="sub-menu">
<li class="#((ViewBag.PageName == " AssetPage ") ? "active " : " ")">Assets
</li>
<li>Configure Text
</li>
<li>Error Log
</li>
<li>Product Settings
</li>
</ul>
</li>
<li class="current">
<span class="icon6"></span>Promo Codes
<ul class="sub-menu">
<li>Manage Promo Code
</li>
<li>Used Promo Code
</li>
</ul>
</li>
Here Subscription,Administration,Promo Codes are Menu Lists which contains Sub-Menu Lists under them.
The thing is I want to apply class=current dynamically when a user clicks on Subscription,Administration,Promo Codes`.
And I am doing this in LayoutPage of MVC.
Any help will be appreciated.

Here you have a working solution: https://jsfiddle.net/c4h3sup9/
You have to use a little bit of Javascript for that.
You have to give the listitems a other class name like in my example "operator"
document.body.addEventListener("click", function(e){
if(e.target && e.target.className == "operator"){
var actives = document.getElementsByClassName("active");
actives[0].setAttribute("class", "operator");
e.target.setAttribute("class", "active");
}
});
for this example you need to assing one element as active from the beginning.
Note:
LI elements are never parents of UL.
The order is:
Unordered List (Plural) -> List item (Singular, Child).
You might want to correct that as it is not standard conform.

To add the class name to the parent <li> element, give the main links a class name. Assuming you also want to remove it from any <li> elements that already have it, also give them a class name
<li class="container">
<span class="icon4"></span>Subscriptions
and the script will be
$('.mainmenu').click(function() {
$('.container').removeClass('current'); // remove any previous
$(this).closest('.container').addClass('current');
});
In addition, if when you navigate to one of the views with this layout, and what to add the class name to the appropriate element, then you can give the <li> elements an id attribute
<li id="subscriptions" class="container">
....
</li>
<li id="administration" class="container">
....
and in the GET method, pass the value of the id to the view (e.g. using ViewBag
public ActionResult ConfigureText()
{
ViewBag.Menu = "administration";
....
return View(...);
}
and add a script that runs when the page first loads
var menu = '#ViewBag.Menu";
$('#' + menu).addClass('current');

jquery collapsible menu help - almost there, but need 2 levels deep collapsible too!

I've taken the accordion menu from http://www.i-marco.nl/weblog/ and have customised it to what I need. One problem I have though is that I have a couple of submenu items which are also collapsible. The code I have works fine in terms of collapsing the menu, but I can't get it to retract this menu when the parent element is clicked. Can anyone see where i'm going wrong here?
Thanks in advance!
HTML snippet:
<ul class='menu collapsible' id='menu'>
<li id="home" class="selected expand top">
Home
</li>
<li id="about_the_school" class="top">
About the School<span>Click to expand</span>
<ul class='acitem'>
<li>
Welcome
</li>
</ul>
</li>
<li id="academic" class="top">
Academic<span>Click to expand</span>
<ul class='acitem'>
<li>
Curriculum & Exam System
</li>
<li>
Departments
<ul class='acitem menu collapsible'>
<li>
Art
</li>
<li>
Business Education
</li>
</ul>
</li>
<li>
Pupil Support
</li>
<li>
Careers
</li>
</ul>
</li>
</ul>
</ul>
JS:
jQuery.fn.initMenu = function(){
return this.each(function(){
var theMenu = $(this).get(0);
$('.acitem', this).hide();
$('li.expand > .acitem', this).show();
$('li.expand > .acitem', this).prev().addClass('active');
$('li a', this).click(function(e){
e.stopImmediatePropagation();
var theElement = $(this).next();
var parent = this.parentNode.parentNode;
if (theElement.hasClass('acitem') && theElement.is(':visible')) {
if ($(parent).hasClass('collapsible')) {
$('.acitem:visible', parent).first().slideUp('normal', function(){
$(this).prev().removeClass('active');
});
return false;
}
return false;
}
if (theElement.hasClass('acitem') && !theElement.is(':visible')) {
//custom - adds class at beginning of expansion
$(this).addClass('active');
$('.acitem:visible', parent).first().slideUp('normal', function(){
$(this).prev().removeClass('active');
});
theElement.slideDown('normal', function(){
$(this).prev().addClass('active');
});
return false;
}
});
});
};$(document).ready(function(){
$('.menu').initMenu();
});

On this section:
<a href="http://localhost//public_html/index.php/academic">Academic
<span>Click to expand</span>
</a>
<ul class='acitem'>
You need a collapsible class on that <ul> to get it to collapse as well, same the others, like this:
<ul class='acitem collapsible'>
You can see an updated/working demo with the fix here.

jquery next siblings

I've been trying to get this problem solved, but I can't seem to figure it out without some serious workarounds.
if I have the following HTML:
<ul>
<li class="parent"> headertext </li>
<li> text </li>
<li> text </li>
<li> text </li>
<li class="parent"> headertext </li>
<li> text </li>
<li> text </li>
</ul>
Now, how do I now just select the <li> tags following the first parent (or second, for that matter)? Basically selecting an <li> with class="parent" and the following siblings until it reaches another <li> with the parent class.
I could restructure the list with nested lists, but I don't want to do that. Any suggestions?

actually, you can easily do this using nextUntil().
no need to write your own "nextUntil" since it already exists.
ex. -
$(".a").nextUntil(".b");
or as suggested by Vincent -
$(".parent:first").nextUntil(".parent");

The root of your problem is that the <li>s you have classed as parent really are NOT parents of the <li>s "below" them. They are siblings. jQuery has many, many functions that work with actual parents. I'd suggest fixing your markup, really. It'd be quicker, cleaner, easier to maintain, and more semantically correct than using jQuery to cobble something together.

I don't think there is a way to do this without using each since any of the other selectors will also select the second parent and it's next siblings.
function getSibs( elem ) {
var sibs = [];
$(elem).nextAll().each( function() {
if (!$(this).hasClass('parent')) {
sibs.push(this);
}
else {
return false;
}
});
return $(sibs);
}

You will have to run the loop yourself since jQuery does not know how to stop on a specific condition.
jQuery.fn.nextUntil = function(selector)
{
var query = jQuery([]);
while( true )
{
var next = this.next();
if( next.length == 0 || next.is(selector) )
{
return query;
}
query.add(next);
}
return query;
}
// To retrieve all LIs avec a parent
$(".parent:first").nextUntil(".parent");
But you may be better using a really structured list for your parent/children relationship
<ul>
<li class="parent"> <span>headertext</span>
<ul>
<li> text </li>
<li> text </li>
<li> text </li>
</ul>
</li>
<li class="parent"> <span>headertext</span>
<ul>
<li> text </li>
<li> text </li>
</ul>
</li>
</ul>

$("li.parent ~ li");

I know this is a very old thread, but Jquery 1.4 has a method called nextUntil, which could be useful for this purpose:
http://api.jquery.com/nextUntil/

<html>
<head>
<script type="text/javascript">
$(document).ready(function() {
$("a").click(function() {
var fred = $("li").not('.parent').text();
$('#result').text(fred);
});
});
</script>
</head>
<body>
Click me
<ul>
<li class="parent"> headertextA </li>
<li> text1 </li>
<li> text2 </li>
<li> text3 </li>
<li class="parent"> headertextB </li>
<li> text4 </li>
<li> text5 </li>
</ul>
<div id="result"></div>
</body>
</html>