Navbar to get horizontal layout - css

Question

I have the following code for a navbar in a React app. The navbar content looks fine when the browser window is wide, but once I drop past the navbar-expand-lg cutoff, the icons align vertically one above the other. How do I prevent that? (see screenshot below code)
import React, {Component} from 'react';
import {
Badge,
Nav,
Navbar,
NavbarBrand,
NavbarToggler,
NavItem,
NavLink,
} from 'reactstrap';
import FontAwesome from '#fortawesome/react-fontawesome';
class Header extends Component {
constructor(props) {
super(props);
}
render() {
return (
<Navbar dark color="dark" expand="lg" className="w-100 p-1">
<NavbarToggler className="d-flex"/>
<NavbarBrand className="ml-3" href="/">Logo</NavbarBrand>
<Nav className="d-flex ml-auto" horizontal="end" navbar>
<NavItem>
<NavLink href="#">
<FontAwesome icon={["fas","bell"]} className="text-light" size="lg" />
<Badge pill color="danger">5</Badge>
</NavLink>
</NavItem>
<NavItem>
<NavLink href="#">
<FontAwesome icon={["fas","clipboard"]} className="text-light" size="lg" />
<Badge pill color="warning">5</Badge>
</NavLink>
</NavItem>
<NavItem>
<NavLink href="#">
<i className="icon-location-pin"></i>
<Badge pill color="info">5</Badge>
</NavLink>
</NavItem>
</Nav>
<NavbarToggler className="d-flex ml-3"/>
</Navbar>
);
}
}
export default Header;

Answer 1

To achieve what you want, you need to use the flex-row class to turn what normally would be a flex column into a flex row.
Here is the complete working code for your navbar including both hamburger menus (I have hidden the right menu items on lg screens with the d-lg-none class):
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css">
<nav class="navbar navbar-expand-lg navbar-light bg-light">
<button class="navbar-toggler mr-3" 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="#">Navbar</a>
<div class="ml-auto order-lg-last">
<ul class="navbar-nav flex-row">
<li class="nav-item pr-3 pr-lg-0">
<a class="nav-link" href="#">
<i class="fa fa-bell" aria-hidden="true"></i>
<span class="badge badge-pill badge-danger">5</span>
</a>
</li>
<li class="nav-item pr-3 pr-lg-0">
<a class="nav-link" href="#">
<i class="fa fa-envelope" aria-hidden="true"></i>
<span class="badge badge-pill badge-warning">6</span>
</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">
<i class="fa fa-telegram" aria-hidden="true"></i>
<span class="badge badge-pill badge-primary">8</span>
</a>
</li>
</ul>
</div>
<button class="navbar-toggler ml-3" type="button" data-toggle="collapse" data-target="#navbarSupportedContent2" aria-controls="navbarSupportedContent2" aria-expanded="false" aria-label="Toggle navigation2">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarSupportedContent">
<ul class="navbar-nav mr-auto">
<li class="nav-item active">
<a class="nav-link" href="#">Left Home <span class="sr-only">(current)</span></a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Left Link 1</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Left Link 2</a>
</li>
</ul>
</div>
<div class="collapse navbar-collapse" id="navbarSupportedContent2">
<ul class="navbar-nav mr-auto d-lg-none">
<li class="nav-item active">
<a class="nav-link" href="#">Right Home <span class="sr-only">(current)</span></a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Right Link 1</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Right Link 2</a>
</li>
</ul>
</div>
</nav>
<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script>
The padding on the right for the icons is adjusted the padding-right classes pr-3 pr-lg-0 i.e. zero or default padding on lg screens and up and 3 units right padding on smaller screens.
Also note how the order-lg-last class switches things around on lg screens and above.

Answer 2

Just replace navbar-expand-lg with navbar-expand