Bootstrap create third menu level with AdminLTE css - html

Question

I'm currently using the AdminLTE template.
But I'm struggling with a third level menu. I've just tried with and without this plugin I'm using and I cannot figure out what I'm doing wrong, because my third level menu does not show up.
Here's the jsfiddle.
And also a image that shows what's going on.
I've read that since bootstrap 3 the dropdown-submenu was implemented, and I've tried to use it, without any success.
<ul class="dropdown-menu">
<li>Login</li>
<li class="dropdown-submenu">
<a tabindex="-1" href="#">More options</a>
<ul class="dropdown-menu">
<li><a tabindex="-1" href="#">Second level</a></li>
<li class="dropdown-submenu">
More..
<ul class="dropdown-menu">
<li>3rd level</li>
<li>3rd level</li>
</ul>
</li>
</ul>
</li>
</ul>
I've searched around google and I found this example, which is the one I'm trying to implement.

Answer 1

As far as I know, bootstrap3 has no default multi-level dropdown functionality. What you are using as markup is taken from this "extension".
You are simply lacking the according CSS for this dropdown solution:
Add this to your stylesheet:
.dropdown-submenu {
position: relative;
}
.dropdown-submenu>.dropdown-menu {
top: 0;
left: 100%;
margin-top: -6px;
margin-left: -1px;
-webkit-border-radius: 0 6px 6px 6px;
-moz-border-radius: 0 6px 6px;
border-radius: 0 6px 6px 6px;
}
.dropdown-submenu:hover>.dropdown-menu {
display: block;
}
.dropdown-submenu>a:after {
display: block;
content: " ";
float: right;
width: 0;
height: 0;
border-color: transparent;
border-style: solid;
border-width: 5px 0 5px 5px;
border-left-color: #ccc;
margin-top: 5px;
margin-right: -10px;
}
.dropdown-submenu:hover>a:after {
border-left-color: #fff;
}
Your updated fiddle