bookinventory/resources/views/partials/navbar.blade.php

<nav class="navbar navbar-expand-md navbar-dark bg-dark fixed-top">
    <a class="navbar-brand" href="/">{{ config('app.name') }}</a>
    <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarsExampleDefault"
            aria-controls="navbarsExampleDefault" aria-expanded="false" aria-label="Toggle navigation">
        <span class="navbar-toggler-icon"></span>
    </button>

    <div class="collapse navbar-collapse" id="navbarsExampleDefault">
        <ul class="navbar-nav mr-auto">
            <li class="nav-item {{ Request::is('/') ? 'active' : '' }}">
                <a class="nav-link" href="/">Home <span class="sr-only">(current)</span></a>
            </li>
            <li class="nav-item {{ Request::segment(1) == 'locations' ? 'active' : '' }}">
                <a class="nav-link" href="{{ route('locations.index') }}">Locations</a>
            </li>
            <li class="nav-item {{ Request::segment(1) == 'add' ? 'active' : '' }}">
                <a class="nav-link" href="{{ route('add') }}">Add</a>
            </li>
        </ul>
        <form class="form-inline my-2 my-lg-0" action="{{ route('search') }}">
            <input name="query" class="form-control mr-sm-2" type="text" placeholder="Search" aria-label="Search" />
            <button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
        </form>
    </div>
</nav>