Dropdown menu inside of another drop down menu is not working - html

Question

I'm having trouble getting a drop-down menu inside another dropdown menu to work. The first level dropdown works fine, but for the second level, when I click on the option for the dropdown menu (Learning Profiles) nothing happens... the menu fails to display.
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet" />
<div class="container">
<div class="row">
<div class="col-md-2">
<nav id="sideNavBar">
<ul class="nav nav-pills nav-stacked">
<li id="navBarTitle">MENU</li>
<li class="dropdown">
Children <span class="caret"></span>
<ul class="dropdown-menu">
<li>
Add Child
</li>
<li>
Archive/Delete Child
</li>
<li>
Children Details
</li>
<li class="dropdown">
Learning Profiles<span class="caret"></span>
<ul class="dropdown-menu">
<li>
Observations
</li>
<li>
Learning Outcomes
</li>
<li>
Photos
</li>
</ul>
</a>
</li>
</ul>
</li>
</ul>
</nav>
</div>
</div>

Answer 1

there is little change in the html
<div class="container">
<div class="row">
<div class="col-md-2">
<nav id="sideNavBar">
<ul class="nav nav-pills nav-stacked">
<li id="navBarTitle">MENU</li>
<li class="dropdown">
Children <span class="caret"></span>
<ul class="dropdown-menu">
<li>
Add Child
</li>
<li>
Archive/Delete Child
</li>
<li>
Children Details
</li>
<li class ="dropdown-submenu">
Learning Profiles<span class="caret"></span>
<ul class="dropdown-menu">
<li>
Observations
</li>
<li>
Learning Outcomes
</li>
<li>
Photos
</li>
</ul>
</a>
</li>
</ul>
</li>
</ul>
</nav>
</div>
</div>
and add the following css
.dropdown-submenu {
position: relative;
}
.dropdown-submenu .dropdown-menu {
top: 0;
left: 100%;
margin-top: -1px;
}
also you need to add javascript
$(document).ready(function(){
$('.dropdown-submenu a.test').on("click", function(e){
$(this).next('ul').toggle();
e.stopPropagation();
e.preventDefault();
});
});
working plunker : https://plnkr.co/edit/jjrowMvX3FJ7OAsFpiaA?p=preview