Add custom classes to anchor in wp_nav_menu

Question

I want to add a custom class to anchors in wp_nav_menu outputs.

Default for example is:

<li id="menu-item" class="menu-item menu-item-type-custom">
    <a href="http://example.com">example</a>
</li>

I want this :

<li id="menu-item" class="menu-item menu-item-type-custom ">
    <a href="http://example.com" class="class">example</a>
</li>

Answer 1

You can do this with the nav_menu_link_attributes filter.

add_filter( 'nav_menu_link_attributes', 'wpse156165_menu_add_class', 10, 3 );

function wpse156165_menu_add_class( $atts, $item, $args ) {
    $class = 'class'; // or something based on $item
    $atts['class'] = $class;
    return $atts;
}

Answer 2

I have solution to add class to anchor tag.

1: Step: add this in functions.php

function add_additional_class_on_a($classes, $item, $args)
{
    if (isset($args->add_a_class)) {
        $classes['class'] = $args->add_a_class;
    }
    return $classes;
}

add_filter('nav_menu_link_attributes', 'add_additional_class_on_a', 1, 3);

2: Then use it like this in your theme

<?php
        // Show Menu here
        wp_nav_menu(array(
            'theme_location' => 'my-footer-menu',
            'menu_class'      => 'footer-top list-unstyled',
            'add_a_class'     => 'box-link text-dark',
        ));
?>

Answer 3

You can add classes natively via interface in admin. Open Screen Options (top right of the screen) and check CSS Classes. I don't remember if class applies to link itself, but you can always target link inside container with CSS (.class a).

Answer 4

add_filter( 'nav_menu_link_attributes', 'wpse156165_menu_add_class', 10, 3 );

function wpse156165_menu_add_class( $classes, $item, $args ) {
    if(isset($args->add_link_class)) {
        $classes['class'] = $args->add_link_class;
    }
    return $classes;
}

Now you can use add_link_class as an array in menus.