I am running Angular 4 (v.4.0.0) and ng-bootstrap (Bootstrap 4). This code won't all be relevant but hoping people can pick and choose what works. It took me sometime to find a solution to get my items to justify right, collapse properly and to implement a dropdown off my google (using OAuth) profile picture.
<div id="header" class="header">
<nav class="navbar navbar-toggleable-sm navbar-inverse bg-faded fixed-top">
<button class="navbar-toggler navbar-toggler-right" 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>
<a class="navbar-brand" href="#">
<img alt='Brand' src='../assets/images/logo-white.png' class='navbar-logo-img d-inline-block align-top '>
<span class="navbar-logo-text">Oncoscape</span>
</a>
<div class="collapse navbar-collapse justify-content-end" id="navbarSupportedContent">
<ul class="navbar-nav float-left">
<a class="navbar-items nav-item nav-link active " *ngIf='authenticated' (click)='goDashboard()'>
<span class="fa fa-dashboard"></span>Dashboard
</a>
<a class="nav-item nav-link navbar-items active" href="http://resources.sttrcancer.org/oncoscape-contact">
<span class="fa fa-comments"></span>Feedback
</a>
<li class="nav-item dropdown">
<a class="nav-link dropdown-toggle" id="navbarDropdownMenuLink" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
<img *ngIf='user && authenticated' class="navbar-pic" src={{user.thumbnail}} alt="Smiley face">
</a>
<div *ngIf='user && authenticated' class="dropdown-menu " aria-labelledby="navbarDropdownMenuLink">
<a class="dropdown-item" (click)="toProfile()">Account</a>
<div class="dropdown-item">
<app-login></app-login>
</div>
</div>
</li>
</ul>
</div>
</nav>
</div>
<router-outlet></router-outlet>