bootstrap 4 - Add active class to menu item

Question

Using Bootstrap 4 v6, I have the following navigation:

I'm trying to set the active class on the selected menu item, but nothing I've done has worked.

The closest that I've come is with this code:

$(document).ready(function() {
$('.navbar ul li').click(function(e) {
    $('.navbar ul li.active').removeClass('active');
    var $this = $(this);
    if (!$this.hasClass('active')) {
        $this.addClass('active');
    }
    e.preventDefault();
});
});

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/css/bootstrap.min.css" integrity="sha384-rwoIResjU2yc3z8GV/NPeZWAv56rSmLldC3R/AZzGRnGxQQKnKkoFVhFQhNUwEyJ" crossorigin="anonymous">
<script src="https://code.jquery.com/jquery-3.1.1.slim.min.js" integrity="sha384-A7FZj7v+d/sdmMqp/nOQwliLvUsJfDHW+k9Omg/a/EheAdgtzNs3hpfag6Ed950n" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/tether/1.4.0/js/tether.min.js" integrity="sha384-DztdAPBWPRXSA/3eYEEUWrWCy7G5KFbe8fFjk5JAIxUYHKkDx6Qin1DkWx51bBrb" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/js/bootstrap.min.js" integrity="sha384-vBWWzlZJ8ea9aCX4pEW3rVHjgjt7zpkNpZk+02D9phzyeVkE+jo0ieGizqPLForn" crossorigin="anonymous"></script>
<nav class="navbar navbar-toggleable-md navbar-inverse bg-inverse 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="#">DCH</a>
    <div class="collapse navbar-collapse" id="navbarSupportedContent">
        <ul class="navbar-nav ml-auto">
            <li class="nav-item active">
                <a class="nav-link" href="index.php">Home</a>
            </li>
            <li class="nav-item dropdown">
                <a class="nav-link dropdown-toggle" data-toggle="dropdown" href="#" role="button" aria-haspopup="true" aria-expanded="false">Feline Diabetes</a>
                <div class="dropdown-menu bg-inverse navbar-inverse">
                    <a class="dropdown-item" href="treatment.php">Treatment</a>
                    <a class="dropdown-item" href="insulin.php">Insulin and Testing</a>
                    <a class="dropdown-item" href="relatedconditions.php">Related Conditions</a>
                </div>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="nutrition.php">Nutrition</a>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="protocol.php">Protocol</a>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="links.php">Links</a>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="http://diabeticcathelp.com/forum" target="_blank">Forum</a>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="contact.php">Contact Us</a>
            </li>
        </ul>
    </div>
</nav>

Answer 1

You can iterate over the links and check if the href of the link matches the document URL then add the active class to the link (or in the li).

$(document).ready(function () {
  const $links = $('.navbar ul li a');
  $.each($links, function (index, link) {
    if (link.href == document.URL) {
      $(this).addClass('active');
    }
  });
});