Wp_Nav_Menu - Add Class on Ul

wp_nav_menu - add class on UL

First of all, you need to create a custom navigation menu from Appearance -> Menus.

Then, use the wp_nav_menu with the following parameters:

<?php 
$args = array(
    'menu_class' => 'nav nav-tabs',        
    'menu' => '(your_menu_id)'
);
wp_nav_menu( $args ); 
?>

There's a lot you can read about Wordpress Menus. I suggest the following:

http://codex.wordpress.org/Navigation_Menus

http://www.paulund.co.uk/how-to-register-menus-in-wordpress

Add classes to Wordpress Menu ul element

To add CSS classes to a WordPress menu, first go to Appearance > Menus in your WordPress theme.

Next, find the Screen Options tab at the top right of the screen. Click to open the panel, and check the box labelled CSS Classes.

If you want to add Class to your Menu.

function main_menu()
{   
    wp_nav_menu( array( 'theme_location' => 'main-menu', 'container'=> false, 'menu_class'=>'nav-link nav-fill w-100'
    ) );

}

if you want to add class to your menu a tag element:

function add_class_to_all_menu_anchors( $atts ) {
    $atts['class'] = 'nav-link nav-fill w-100';

    return $atts;
}
add_filter( 'nav_menu_link_attributes', 'add_class_to_all_menu_anchors', 10 );

Adding class to li elements in wp_nav_menu

The menu_class parameter of wp_nav_menu() controls the class added to the <ul> wrapper element, rather than the individual <li>'s. To add classes to the menu items, you want to use the nav_menu_css_class filter.

Here's how it works (add this to your theme's functions.php file):

add_filter ( 'nav_menu_css_class', 'so_37823371_menu_item_class', 10, 4 );

function so_37823371_menu_item_class ( $classes, $item, $args, $depth ){
  $classes[] = 'menu-li';
  return $classes;
}

This will add the menu-li class to every menu item.

You can also do this conditionally based on the $item, $args etc. passed to this filter if you like.

How to add class to link in wp_nav_menu?

Thanks to Sergiu Paraschiv comment the issue was in regards of limiting to 1.

Therefore it should be in function.php:

function add_menuclass($ulclass) {
   return preg_replace('/<a /', '<a class="list-group-item"', $ulclass);
}
add_filter('wp_nav_menu','add_menuclass');

UPDATE

There is a better way actually which gives us much more control and the piece of code is provided by Jeff Starr on this post

NOTE: this isn't adding the current class tho

Create your menu on wp, then remember to click the location in the menu editor then in your function you'd do:

// custom menu example @ https://digwp.com/2011/11/html-formatting-custom-menus/
function clean_custom_menus() {
    $menu_name = 'nav-primary'; // specify custom menu name
    if (($locations = get_nav_menu_locations()) && isset($locations[$menu_name])) {
        $menu = wp_get_nav_menu_object($locations[$menu_name]);
        $menu_items = wp_get_nav_menu_items($menu->term_id);

        $menu_list = '<nav>' ."\n";
        $menu_list .= "\t\t\t\t". '<ul>' ."\n";
        foreach ((array) $menu_items as $key => $menu_item) {
            $title = $menu_item->title;
            $url = $menu_item->url;
            $menu_list .= "\t\t\t\t\t". '<li><a href="'. $url .'">'. $title .'</a></li>' ."\n";
        }
        $menu_list .= "\t\t\t\t". '</ul>' ."\n";
        $menu_list .= "\t\t\t". '</nav>' ."\n";
    } else {
        // $menu_list = '<!-- no list defined -->';
    }
    echo $menu_list;
}

Finally we can call our menu:

<?php if (function_exists(clean_custom_menus())) clean_custom_menus(); ?>

The code above is taken from the post linked above, I thought to include this answer as it appears this question has many visits.

UPDATE 2

Another solution would be (maybe the best):

header.php:

    <?php
      wp_nav_menu( array(
        'theme_location'  => 'topnav',
        'menu'            =>'topnav',
        'container'       => 'div', 
        'container_class' => 'collapse navbar-collapse', 
        'container_id'    => 'navbarCollapse',
        'menu_class'      => 'menu', 
        'echo'            => true,
        'fallback_cb'     => 'wp_page_menu',
        'items_wrap'      => '<ul class="nav justify-content-end w-100 %2$s">%3$s</ul>',
        'depth'           => 0
      ) );
    ?>

function.php:

 // register the nav
 function register_my_menu() {
  register_nav_menu('topnav',__( 'topnav' ));
 }
 add_action( 'init', 'register_my_menu' );

// let's add "*active*" as a class to the li

add_filter('nav_menu_css_class' , 'special_nav_class' , 10 , 2);
function special_nav_class($classes, $item){
     if( in_array('current-menu-item', $classes) ){
             $classes[] = 'active ';
     }
     return $classes;
}

// let's add our custom class to the actual link tag    

function atg_menu_classes($classes, $item, $args) {
  if($args->theme_location == 'topnav') {
    $classes[] = 'nav-link';
  }
  return $classes;
}
add_filter('nav_menu_css_class', 'atg_menu_classes', 1, 3);

function add_menuclass($ulclass) {
   return preg_replace('/<a /', '<a class="nav-link"', $ulclass);
}
add_filter('wp_nav_menu','add_menuclass');

How to add class to wp_nav_menu() function

You should try and read the documentation for issues like this as the WordPress documentation is extensive and very good.

https://developer.wordpress.org/reference/functions/wp_nav_menu/

To solve this issue, below 'theme_location' => 'top' add in 'menu_class' => 'menu vertical medium-horizontal expanded medium-text-center'. So your final code will be:

<div class="top-bar" id="main-menu">
        <?php 
            $args = array(
                'theme_location' => 'top',
                 'menu_class' => 'menu vertical medium-horizontal expanded medium-text-center'
            );
        ?>
        <?php wp_nav_menu($args); ?>
    </div>

wp_nav_menu() doesn't assign ul class

If the menu (WP admin area) is not set, then the "nav navbar-nav navbar-left" is applied to "container".
In other words, it overwrites the "container_class".

If the menu is set, then the "menu_class" is applied to "ul".

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