jQuery Question

Sub menu on hover over navbar link in bootstrap

I want to to implement a feature in my bootstrap project like whenever someone will hover over my one of navbar links, it will display a detailed menu vertically like a menu in image below

enter image description here

I know how to make dropdown on hover over navbar link, but how can i populate this type of sub menu on hover.
Is already there any tutorial or example exists then do share with me.
If not then share idea!

Thanks!

Html

<nav class="navbar navbar-default">
<div class="container-fluid">
<!-- Brand and toggle get grouped for better mobile display -->
<div class="navbar-header">
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" aria-expanded="false">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="#">Brand</a>
</div>

<!-- Collect the nav links, forms, and other content for toggling -->
<div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
<ul class="nav navbar-nav">
<li class="active"><a href="#">Link <span class="sr-only">(current)</span></a></li>
<li><a href="#">Link</a></li>
<li class="dropdown">
<a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">Dropdown <span class="caret"></span></a>
<ul class="dropdown-menu">
<li><a href="#">Action</a></li>
<li><a href="#">Another action</a></li>
<li><a href="#">Something else here</a></li>
<li role="separator" class="divider"></li>
<li><a href="#">Separated link</a></li>
<li role="separator" class="divider"></li>
<li><a href="#">One more separated link</a></li>
</ul>
</li>
</ul>
<form class="navbar-form navbar-left" role="search">
<div class="form-group">
<input type="text" class="form-control" placeholder="Search">
</div>
<button type="submit" class="btn btn-default">Submit</button>
</form>
<ul class="nav navbar-nav navbar-right">
<li><a href="#">Link</a></li>
<li class="dropdown">
<a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">Dropdown <span class="caret"></span></a>
<ul class="dropdown-menu">
<li><a href="#">Action</a></li>
<li><a href="#">Another action</a></li>
<li><a href="#">Something else here</a></li>
<li role="separator" class="divider"></li>
<li><a href="#">Separated link</a></li>
</ul>
</li>
</ul>
</div><!-- /.navbar-collapse -->
</div><!-- /.container-fluid -->
</nav>

Answer

This may be an option, you just need to adjust the margin and padding to your needs.

Hope it helps. ;)

@import url('https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css');

.dropdown-menu-fixed {
  margin: 0;
  padding: 0;
  height: auto;
  background-color: #fff;
}

.dropdown-menu-fixed > ul {
  position: relative;
  margin: 1rem 0 0;
  padding: 0 0 1rem 0;
  min-height: 1px;
  float: none;
  width: 100%;
}

.dropdown-menu-fixed > ul li {
  padding: 3px 20px;
}

.dropdown-menu-fixed a {
  display: block;
  text-decoration: none;
}

.dropdown-header {
  font-weight: bold;
  font-size: 13px;
}

@media (min-width: 768px) {
  .dropdown-menu-fixed {
    position: fixed;
    top: 50px;
    width: 100%;
    background-color: #fff;
  }
  .dropdown-menu-fixed > ul {
    position: relative;
    margin: 1rem 0 0;
    padding: 0 0 1rem 60px;
    min-height: 1px;
    float: left;
    width: 33.33333333%;
  }
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>

<nav class="navbar navbar-default">
  <div class="container-fluid">
    <!-- Brand and toggle get grouped for better mobile display -->
    <div class="navbar-header">
      <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" aria-expanded="false">
        <span class="sr-only">Toggle navigation</span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
      </button>
      <a class="navbar-brand" href="#">Brand</a>
    </div>

    <!-- Collect the nav links, forms, and other content for toggling -->
    <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
      <ul class="nav navbar-nav">
        <li class="dropdown">
          <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">Personal 
            <span class="caret"></span>
          </a>
          <div class="dropdown-menu dropdown-menu-fixed">

            <ul class="list-unstyled">
              <li class="dropdown-header">Dropdown header</li>
              <li><a class="small" href="#">Action</a></li>
              <li><a class="small" href="#">Another action</a></li>
            </ul>

            <ul class="list-unstyled">
              <li class="dropdown-header">Dropdown header</li>
              <li><a class="small" href="#">Action</a></li>
              <li><a class="small" href="#">Another action</a></li>
            </ul>

            <ul class="list-unstyled">
              <li class="dropdown-header">Dropdown header</li>
              <li><a class="small" href="#">Action</a></li>
              <li><a class="small" href="#">Another action</a></li>
            </ul>

          </div>
        </li>

      </ul>
    </div><!-- /.navbar-collapse -->
  </div><!-- /.container-fluid -->
</nav>