<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script>
<script src="//code.jquery.com/jquery-1.11.1.min.js"></script>
<!------ Include the above in your HEAD tag ---------->
<div class="text-center"><h2>Bootstrap 4 Multilevel Dropdown Menu</h2></div>
<div id="menu_area" class="menu-area">
<div class="container">
<div class="row">
<nav class="navbar navbar-light navbar-expand-lg mainmenu">
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarSupportedContent">
<ul class="navbar-nav mr-auto">
<li class="active"><a href="#">Home <span class="sr-only">(current)</span></a></li>
<li><a href="#">Link</a></li>
<li class="dropdown">
<a class="dropdown-toggle" href="#" id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Dropdown</a>
<ul class="dropdown-menu" aria-labelledby="navbarDropdown">
<li><a href="#">Action</a></li>
<li><a href="#">Another action</a></li>
<li><a href="#">Something else here</a></li>
<li class="dropdown">
<a class="dropdown-toggle" href="#" id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Dropdown2</a>
<ul class="dropdown-menu" aria-labelledby="navbarDropdown">
<li><a href="#">Action</a></li>
<li><a href="#">Another action</a></li>
<li><a href="#">Something else here</a></li>
<li class="dropdown">
<a class="dropdown-toggle" href="#" id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Dropdown3</a>
<ul class="dropdown-menu" aria-labelledby="navbarDropdown">
<li><a href="#">Action</a></li>
<li><a href="#">Another action</a></li>
<li><a href="#">Something else here</a></li>
</ul>
</li>
</ul>
</li>
</ul>
</li>
<li><a href="#">Service</a></li>
</ul>
</div>
</nav>
</div>
</div>
</div>
<br>
<div class="text-center"><span><a href="https://bootsnipp.com/snippets/m1d5N">Bootstrap 3 Multilevel Dropdown Menu >></a></span></div>
.menu-area{background: #d61a5e}
.dropdown-menu{padding:0;margin:0;border:0 solid transition!important;border:0 solid rgba(0,0,0,.15);border-radius:0;-webkit-box-shadow:none!important;box-shadow:none!important}
.mainmenu a, .navbar-default .navbar-nav > li > a, .mainmenu ul li a , .navbar-expand-lg .navbar-nav .nav-link{color:#fff;font-size:16px;text-transform:capitalize;padding:16px 15px;font-family:'Roboto',sans-serif;display: block !important;}
.mainmenu .active a,.mainmenu .active a:focus,.mainmenu .active a:hover,.mainmenu li a:hover,.mainmenu li a:focus ,.navbar-default .navbar-nav>.show>a, .navbar-default .navbar-nav>.show>a:focus, .navbar-default .navbar-nav>.show>a:hover{color: #fff;background: #4CAF50;outline: 0;}
/*==========Sub Menu=v==========*/
.mainmenu .collapse ul > li:hover > a{background: #4CAF50;}
.mainmenu .collapse ul ul > li:hover > a, .navbar-default .navbar-nav .show .dropdown-menu > li > a:focus, .navbar-default .navbar-nav .show .dropdown-menu > li > a:hover{background: #4CAF50;}
.mainmenu .collapse ul ul ul > li:hover > a{background: #4CAF50;}
.mainmenu .collapse ul ul, .mainmenu .collapse ul ul.dropdown-menu{background:#1565C0;}
.mainmenu .collapse ul ul ul, .mainmenu .collapse ul ul ul.dropdown-menu{background:#1E88E5}
.mainmenu .collapse ul ul ul ul, .mainmenu .collapse ul ul ul ul.dropdown-menu{background:#64B5F6}
/******************************Drop-down menu work on hover**********************************/
.mainmenu{background: none;border: 0 solid;margin: 0;padding: 0;min-height:20px;width: 100%;}
@media only screen and (min-width: 767px) {
.mainmenu .collapse ul li:hover> ul{display:block}
.mainmenu .collapse ul ul{position:absolute;top:100%;left:0;min-width:250px;display:none}
/*******/
.mainmenu .collapse ul ul li{position:relative}
.mainmenu .collapse ul ul li:hover> ul{display:block}
.mainmenu .collapse ul ul ul{position:absolute;top:0;left:100%;min-width:250px;display:none}
/*******/
.mainmenu .collapse ul ul ul li{position:relative}
.mainmenu .collapse ul ul ul li:hover ul{display:block}
.mainmenu .collapse ul ul ul ul{position:absolute;top:0;left:-100%;min-width:250px;display:none;z-index:1}
}
@media only screen and (max-width: 767px) {
.navbar-nav .show .dropdown-menu .dropdown-menu > li > a{padding:16px 15px 16px 35px}
.navbar-nav .show .dropdown-menu .dropdown-menu .dropdown-menu > li > a{padding:16px 15px 16px 45px}
}
(function($){
$('.dropdown-menu a.dropdown-toggle').on('click', function(e) {
if (!$(this).next().hasClass('show')) {
$(this).parents('.dropdown-menu').first().find('.show').removeClass("show");
}
var $subMenu = $(this).next(".dropdown-menu");
$subMenu.toggleClass('show');
$(this).parents('li.nav-item.dropdown.show').on('hidden.bs.dropdown', function(e) {
$('.dropdown-submenu .show').removeClass("show");
});
return false;
});
})(jQuery)
