Develop Reference

How to keep submenu opened after page load in JavaScript

I have almost done my work and my client ask for keeping submenu opened when user click the item in the menu and also set active color. The idea is better orientation when user actualy is. In React App it wouldn't be problem, cuz whole app works like single page. In this case i've decided use only HTML/JS as my challenge.
Is it even possible somehow keep menu opened/open again menu when new page is loaded please?
I tried make from this app something like single page app by some tutorials like "load paghe without refresh" etc, but nothing worked.
menu
<div class="menu">
<div class="item">
<a class="sub-btn">
Matice
<i class="fas fa-angle-right dropdown"></i>
</a>
<div class="sub-menu">
<a
href="/pages/matice/zakladni-operace.html"
id="matice/zakladni-operace"
onClick="reply_click(this.id)"
class="sub-item">
Základní operace
</a>
<a
href="/pages/matice/hodnosti.html"
id="matice/hodnosti"
onClick="reply_click(this.id)"
class="sub-item">
Hodnost
</a>
<a
href="/pages/matice/determinanty.html"
id="matice/determinanty"
onClick="reply_click(this.id)"
class="sub-item">
Determinanty
</a>
<a
href="/pages/matice/inverzni-matice.html"
id="matice/inverzni-matice"
onClick="reply_click(this.id)"
class="sub-item">
Inverzní matice
</a>
<a
href="/pages/matice/maticove-rovnice.html"
id="matice/maticove-rovnice"
onClick="reply_click(this.id)"
class="sub-item">
Maticové rovnice
</a>
<a
href="/pages/matice/vlastni-cisla-a-vektory.html"
id="matice/vlastni-cisla-a-vektory"
onClick="reply_click(this.id)"
class="sub-item">
Vlastní čísla a vektory
</a>
</div>
</div>
</div>

You can try to get window.location.href on load of your page and add style classes depending on conditionally with something like
<div class="<%= 'yourStyleClass' if #url== 'urURL' %>"> to set active color

You could use AJAX to call the page. But that doesn't sound like what you want. An alternative way in javascript would be to get the current window.location.href when the page loads, then inject a class name into the relevant node, and have the css for that class make it visible and highlighted.
If you're using a library like jQuery this shouldn't be too hard to achieve.

Materialize sidenav collapsible won't work within a separate JS file

Sorry if this has been answered previously; I've dug around but can't find it. I'm using the Materialize sidenav by calling M.AutoInit() which works for me until I try putting it in a separate Javascript file. I've been able to set up my footer this way so I don't have repeat code, but this doesn't seem to work for the sidenav. The sidenav shows up but the collapsible part will not open.
I think the problem is it doesn't like calling the collapsible part from HTML that is being inserted dynamically. But I tried separating out the collapsible portion (using 2 different querySelectors) which did not work either. If I were to put at least part of the sidenav back into my HTML page, it would defeat the purpose of me doing this.
Any thoughts or solutions? Thanks for looking at it!
document.addEventListener("DOMContentLoaded", () => {
M.AutoInit()
document.querySelector('header').insertAdjacentHTML('afterbegin',
`<ul id="slide-out" class="sidenav sidenav-fixed">
<li>
<a
href="https://www.greece.org/"
target="_blank"
rel="noopener noreferrer"
>HEC Main</a
>
</li>
<li>
<a href="index.html" class="sidenav-close" rel="noopener noreferrer"
>Home</a
>
</li>
<li class="no-padding">
<ul class="collapsible collapsible-accordion">
<li>
<button class="collapsible-header">
History<i class="material-icons">arrow_drop_down</i>
</button>
<div class="collapsible-body">
<ul class="sidenav-close">
<li>
A Brief Review
</li>
<li>Philosophers List</li>
<li>Philosophers Map</li>
<li>The Beginning</li>
<li>Socrates</li>
<li>Plato</li>
<li>Aristotle</li>
<li>
<a href="bibliography-references.html"
>Bibliograpy / References</a
>
</li>
</ul>
</div>
</li>
</ul>
</li>
<li class="divider"></li>
<li>
Media
</li>
<li>
Events
</li>
</ul>`)
document.querySelector('main').insertAdjacentHTML('afterend',
`<footer class="page-footer">
<div class="container">
<p class="center-align">
Philosophy is sponsored by
<a
href="https://www.greece.org"
target="_blank"
>
www.greece.org
</a> | © 2021 All Rights Reserved.
</p>
</div>
<div class="fixed-action-btn">
<a href="#top" class="btn-floating btn-large" style="background-color: silver;">
<i class="large material-icons">arrow_upward</i>
</a>
</div>
</footer>`)
})

Initialisation is a one time thing - it scans the document for the matching selector, and runs the initialisation on it. So, always run the initialisation AFTER any dynamic content is added. If you add stuff on the fly, just run the init again.
Codepen.
document.addEventListener('DOMContentLoaded', function() {
// Always add stuff to the page BEFORE running the init
// Anything hardcoded to the page will be fine if wrapped in a document ready.
M.AutoInit();
// Anything added after the init will NOT be initialised. It's a one time thing. Run the init at the end of any dynamic additions.
});

Why bootstrap form helper language picker making no effects, while pushing a tags in it?

I'm trying to create a language bar with the jQuery bootstrap plugin, but it seems there is no option to append any action to anchor tags in drop down menu at all. They are just un-clickable.
Initialization of plugin:
<div class="bfh-selectbox bfh-languages" data-language="pl_PL" data-available="en_US,pl_PL" data-flags="true" data-blank="false">
<input type="hidden" value="">
<a class="bfh-selectbox-toggle" role="button" data-toggle="bfh-selectbox" href="#">
<span class="bfh-selectbox-option input-medium" data-option=""></span>
<b class="caret"></b>
</a>
<div class="bfh-selectbox-options">
<div role="listbox">
<ul role="option">
<li>
<a href="/index.php?lang=pl_PL" data-option="pl_PL">
<i class="glyphicon bfh-flag-PL"></i>
</a>
</li>
<li>
<a href="/index.php?lang=en_US" data-option="en_US">
<i class="glyphicon bfh-flag-US"></i>
</a>
</li>
</ul>
</div>
</div>
</div>
Commenting or uncommenting doesn't make any difference.
Another possibly related issue:
When I'm stretching out my web page, with the container overflowing the language bar completely, it becomes completely un-clickable. I don't want to change this plugin on something else in case someone will offer.
The address of the website is here.

How to trigger a click on a list with many list items using jQuery

Please note that I want to use JQuery for this.
This question How to trigger a click on a link using jQuery provided a solution for when only one anchor exists inside the list
However I have more than one list item and more than one anchor.
<ul id="navigation_list">
<li id="sub_menu1_tab" style="">
<span class="decorator"></span>
<a id="policies" href="#admin/menu1_list" class="admin-submenu-item"></a>
</li>
<li id="sub_menu2_tab" style="">
<span class="decorator"></span>
<a id="rules" href="#admin/menu2_list" class="admin-submenu-item"></a>
</li>
<li id="sub_menu3_tab" style="">
<span class="decorator"></span>
<a id="reports" href="#admin/menu3_list" class="admin-submenu-item"></a>
</li>
</ul>
How do I trigger a click on only one of the anchors? For example I want to trigger the second list item anchor.
I have tried the following without success
$("#sub_menu2_tab a").trigger('click');
and
$("#navigation_list #sub_menu2_tab a").trigger('click');

just try
$("#sub_menu2_tab a").click();

Toggle active class using Ratchet framework

Ratchet mobile framework uses a bottom button structure that looks like this:
<nav class="bar-tab">
<ul class="tab-inner">
<li class="tab-item active">
<a href="#">
<img class="tab-icon" src="img/icon-messages.png">
<div class="tab-label">Label</div>
</a>
</li>
<li class="tab-item">
<a href="#">
<img class="tab-icon" src="img/icon-hamburger.png">
<div class="tab-label">Label</div>
</a>
</li>
<li class="tab-item">
<a href="#">
<img class="tab-icon" src="img/icon-settings.png">
<div class="tab-label">Label</div>
</a>
</li>
I am trying to use JS to change the active tab to which ever one is clicked. The approach I am trying to take to is the following logic.
If the page that the site is on is the same as the href link then show that link active.
<script language="JavaScript">
var sPath=window.location.pathname;
var sPage = sPath.substring(sPath.lastIndexOf('/') + 1);
$('.bar-tab li.tab-inner').click(function() {
$(".active").removeClass("active");
$(this).parent().toggleClass('active', $(this).attr('href') == sPage);
});
</script>
I don't want it to just be the last button clicked because there are other ways to navigate back to the major sections of the app and it will look weird to have a button showing active if the content they are looking at is completely unrelated.
Thanks for any help.

Take a look at emberJS
{{#link-to 'index' classNames='tab-item'}}
<span class="icon icon-list"></span>
<span class="tab-label">Oversigt</span>
{{/link-to}}
With this syntax, based on the routing the current tab is set to active