I'm developing a website that needs a dropdown menu within a dropdown menu but apparently in bootstrap 5.0 they removed that functionality? I've heard there are still ways to get sub-menus but all of the methods that I have tried didn't work, please help!
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This is the clean way to implement this!
(function($bs) {
const CLASS_NAME = 'has-child-dropdown-show';
$bs.Dropdown.prototype.toggle = function(_orginal) {
return function() {
document.querySelectorAll('.' + CLASS_NAME).forEach(function(e) {
e.classList.remove(CLASS_NAME);
});
let dd = this._element.closest('.dropdown').parentNode.closest('.dropdown');
for (; dd && dd !== document; dd = dd.parentNode.closest('.dropdown')) {
dd.classList.add(CLASS_NAME);
}
return _orginal.call(this);
}
}($bs.Dropdown.prototype.toggle);
document.querySelectorAll('.dropdown').forEach(function(dd) {
dd.addEventListener('hide.bs.dropdown', function(e) {
if (this.classList.contains(CLASS_NAME)) {
this.classList.remove(CLASS_NAME);
e.preventDefault();
}
if(e.clickEvent && e.clickEvent.composedPath().some(el=>el.classList && el.classList.contains('dropdown-toggle'))){
e.preventDefault();
}
e.stopPropagation(); // do not need pop in multi level mode
});
});
// for hover
function getDropdown(element) {
return $bs.Dropdown.getInstance(element) || new $bs.Dropdown(element);
}
document.querySelectorAll('.dropdown-hover, .dropdown-hover-all .dropdown').forEach(function(dd) {
dd.addEventListener('mouseenter', function(e) {
let toggle = e.target.querySelector(':scope>[data-bs-toggle="dropdown"]');
if (!toggle.classList.contains('show')) {
getDropdown(toggle).toggle();
}
});
dd.addEventListener('mouseleave', function(e) {
let toggle = e.target.querySelector(':scope>[data-bs-toggle="dropdown"]');
if (toggle.classList.contains('show')) {
getDropdown(toggle).toggle();
}
});
});
})(bootstrap);<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0, user-scalable=no, shrink-to-fit=no" />
<!-- Begin SEO tag -->
<title>Infinite Multiple Level Dropdown Menu base on Bootstrap</title>
<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.0-beta3/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-eOJMYsd53ii+scO/bJGFsiCZc+5NDVN2yr8+0RDqr0Ql0h+rP48ckxlpbzKgwra6" crossorigin="anonymous">
<style>.dropdown-hover-all .dropdown-menu, .dropdown-hover > .dropdown-menu.dropend { margin-left:-1px !important }</style>
</head>
<body class="">
<nav class="navbar navbar-expand-md navbar-dark fixed-top bg-dark">
<div class="collapse navbar-collapse" id="navbarsExampleDefault">
<ul class="navbar-nav mr-auto">
<li class="nav-item active">
<a class="nav-link" href="#">Demo <span class="sr-only">(current)</span></a>
</li>
<li class="nav-item dropdown dropdown-hover">
<a class="nav-link dropdown-toggle" href="#" id="dropdown01" data-bs-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Hover</a>
<div class="dropdown-menu" aria-labelledby="dropdown01">
<a class="dropdown-item" href="#">Single App</a>
<a class="dropdown-item" href="#">Multiple Works</a>
<div class="dropdown-divider"></div>
<a class="dropdown-item" href="#">Disctribution</a>
</div>
</li>
<li class="nav-item dropdown">
<a class="nav-link dropdown-toggle" href="#" id="dropdown02" data-bs-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Documents</a>
<div class="dropdown-menu" aria-labelledby="dropdown02">
<a class="dropdown-item" href="#">Introduction</a>
<div class="dropdown dropend">
<a class="dropdown-item dropdown-toggle" href="#" id="dropdown-layouts" data-bs-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Layouts</a>
<div class="dropdown-menu" aria-labelledby="dropdown-layouts">
<a class="dropdown-item" href="#">Basic</a>
<a class="dropdown-item" href="#">Compact Aside</a>
<div class="dropdown-divider"></div>
<div class="dropdown dropend">
<a class="dropdown-item dropdown-toggle" href="#" id="dropdown-layouts" data-bs-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Custom</a>
<div class="dropdown-menu" aria-labelledby="dropdown-layouts">
<a class="dropdown-item" href="#">Fullscreen</a>
<a class="dropdown-item" href="#">Empty</a>
<div class="dropdown-divider"></div>
<a class="dropdown-item" href="#">Magic</a>
</div>
</div>
</div>
</div>
<div class="dropdown-divider"></div>
<a class="dropdown-item" href="#">Something else here</a>
</div>
</li>
<li class="nav-item active">
<a class="nav-link" href="https://github.com/dallaslu/bootstrap-5-multi-level-dropdown">View on Github</a>
</li>
</ul>
</div>
</nav>
<div class="container" style="padding-top: 3.5rem">
<div class="dropdown mt-3">
<button class="btn btn-secondary dropdown-toggle" type="button" id="dropdownMenuButton" data-bs-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
Dropdown button
</button>
<div class="dropdown-menu" aria-labelledby="dropdownMenuButton">
<a class="dropdown-item" href="#">Action</a>
<div class="dropdown dropend">
<a class="dropdown-item dropdown-toggle" href="#" id="dropdown-layouts" data-bs-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Layouts</a>
<div class="dropdown-menu" aria-labelledby="dropdown-layouts">
<a class="dropdown-item" href="#">Basic</a>
<a class="dropdown-item" href="#">Compact Aside</a>
<div class="dropdown-divider"></div>
<div class="dropdown dropend">
<a class="dropdown-item dropdown-toggle" href="#" id="dropdown-layouts" data-bs-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Custom</a>
<div class="dropdown-menu" aria-labelledby="dropdown-layouts">
<a class="dropdown-item" href="#">Fullscreen</a>
<a class="dropdown-item" href="#">Empty</a>
<div class="dropdown-divider"></div>
<a class="dropdown-item" href="#">Magic</a>
</div>
</div>
</div>
</div>
<a class="dropdown-item" href="#">Something else here</a>
</div>
</div>
<div class="d-flex dropdown-hover-all">
<div class="dropdown mt-3">
<button class="btn btn-secondary dropdown-toggle" type="button" id="dropdownMenuButton222" data-bs-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
Dropdown Hover
</button>
<div class="dropdown-menu" aria-labelledby="dropdownMenuButton222">
<a class="dropdown-item" href="#">Action</a>
<div class="dropdown dropend">
<a class="dropdown-item dropdown-toggle" href="#" id="dropdown-layouts" data-bs-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Layouts</a>
<div class="dropdown-menu" aria-labelledby="dropdown-layouts">
<a class="dropdown-item" href="#">Basic</a>
<a class="dropdown-item" href="#">Compact Aside</a>
<div class="dropdown-divider"></div>
<div class="dropdown dropend">
<a class="dropdown-item dropdown-toggle" href="#" id="dropdown-layouts" data-bs-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Custom</a>
<div class="dropdown-menu" aria-labelledby="dropdown-layouts">
<a class="dropdown-item" href="#">Fullscreen</a>
<a class="dropdown-item" href="#">Empty</a>
<div class="dropdown-divider"></div>
<a class="dropdown-item" href="#">Magic</a>
</div>
</div>
</div>
</div>
<a class="dropdown-item" href="#">Something else here</a>
</div>
</div>
</div>
</div>
<script src="https://cdn.jsdelivr.net/npm/@popperjs/core@2.9.1/dist/umd/popper.min.js" integrity="sha384-SR1sx49pcuLnqZUnnPwx6FCym0wLsk5JZuNx2bPPENzswTNFaQU1RDvt3wT4gWFG" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.0.0-beta3/dist/js/bootstrap.min.js" integrity="sha384-j0CNLUeiqtyaRmlzUHCPZ+Gy5fQu0dQ6eZ/xAww941Ai1SxSY+0EQqNXNE6DZiVc" crossorigin="anonymous"></script>
</body>
</html>Also, keep in mind that hover functionality will not work on mobile devices. Now you can choose best scenario for yourself!
thelovekesh
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0
Here is the code to get a sub-menu under the menu.
HTML:
> <nav class="navbar navbar-expand-lg navbar-dark bg-primary">
> <div class="container-fluid">
> <a class="navbar-brand" href="#">Brand</a>
> <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#main_nav"
> aria-expanded="false" aria-label="Toggle navigation">
> <span class="navbar-toggler-icon"></span>
> </button>
> <div class="collapse navbar-collapse" id="main_nav">
> <ul class="navbar-nav">
> <li class="nav-item active"> <a class="nav-link" href="#">Home </a> </li>
> <li class="nav-item"><a class="nav-link" href="#"> About </a></li>
> <li class="nav-item dropdown" id="myDropdown">
> <a class="nav-link dropdown-toggle" href="#" data-bs-toggle="dropdown"> Treeview menu </a>
> <ul class="dropdown-menu">
> <li> <a class="dropdown-item" href="#"> Dropdown item 1 </a></li>
> <li> <a class="dropdown-item" href="#"> Dropdown item 2 » </a>
> <ul class="submenu dropdown-menu">
> <li><a class="dropdown-item" href="#">Submenu item 1</a></li>
> <li><a class="dropdown-item" href="#">Submenu item 2</a></li>
> <li><a class="dropdown-item" href="#">Submenu item 3 » </a>
> <ul class="submenu dropdown-menu">
> <li><a class="dropdown-item" href="#">Multi level 1</a></li>
> <li><a class="dropdown-item" href="#">Multi level 2</a></li>
> </ul>
> </li>
> <li><a class="dropdown-item" href="#">Submenu item 4</a></li>
> <li><a class="dropdown-item" href="#">Submenu item 5</a></li>
> </ul>
> </li>
> <li><a class="dropdown-item" href="#"> Dropdown item 3 </a></li>
> <li><a class="dropdown-item" href="#"> Dropdown item 4 </a></li>
> </ul>
> </li>
> </ul>
> </div>
> <!-- navbar-collapse.// -->
> </div>
> <!-- container-fluid.// -->
> </nav>
JavaScript:
document.addEventListener("DOMContentLoaded", function(){
// make it as accordion for smaller screens
if (window.innerWidth < 992) {
// close all inner dropdowns when parent is closed
document.querySelectorAll('.navbar .dropdown').forEach(function(everydropdown){
everydropdown.addEventListener('hidden.bs.dropdown', function () {
// after dropdown is hidden, then find all submenus
this.querySelectorAll('.submenu').forEach(function(everysubmenu){
// hide every submenu as well
everysubmenu.style.display = 'none';
});
})
});
document.querySelectorAll('.dropdown-menu a').forEach(function(element){
element.addEventListener('click', function (e) {
let nextEl = this.nextElementSibling;
if(nextEl && nextEl.classList.contains('submenu')) {
// prevent opening link if link needs to open dropdown
e.preventDefault();
if(nextEl.style.display == 'block'){
nextEl.style.display = 'none';
} else {
nextEl.style.display = 'block';
}
}
});
})
}
// end if innerWidth
});
// DOMContentLoaded end
CSS for responsiveness:
/* ============ desktop view ============ */
@media all and (min-width: 992px) {
.dropdown-menu li{ position: relative; }
.nav-item .submenu{
display: none;
position: absolute;
left:100%; top:-7px;
}
.nav-item .submenu-left{
right:100%; left:auto;
}
.dropdown-menu > li:hover{ background-color: #f1f1f1 }
.dropdown-menu > li:hover > .submenu{ display: block; }
}
/* ============ desktop view .end// ============ */
/* ============ small devices ============ */
@media (max-width: 991px) {
.dropdown-menu .dropdown-menu{
margin-left:0.7rem; margin-right:0.7rem; margin-bottom: .5rem;
}
}
/* ============ small devices .end// ============ */
output:
Abhishek Chhabra
- 366
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- 12
-
The answer that you have shared is suitable for desktop screens. But when you will use this on a mobile screen the submenus will not work as you have shared hover based submenu. – thelovekesh Jun 20 '21 at 05:16