wp-bootstrap / wp-bootstrap-navwalker

A custom WordPress nav walker class to fully implement the Twitter Bootstrap 4.0+ navigation style (v3-branch available for Bootstrap 3) in a custom theme using the WordPress built in menu manager.

WP-Bootstrap

WP-Bootstrap is a simple collection of Twitter Bootstrap tools for WordPress.

wp-bootstrap-navwalker's Issues

Works on local, but not online

I'm currently using wp-bootstrap-navwalker for a customized navigator for my bootstrap/wordpress website. It worked well locally using MAMP, but once I uploaded the theme and activate it on the online wordpress, I get the following errors:

Warning: Missing argument 2 for register_nav_menu(), called in /mnt/web5/c0/58/51640958/htdocs/adam/wp-content/themes/Adam/functions.php on line 178 and defined in /mnt/web5/c0/58/51640958/htdocs/adam/wp-includes/nav-menu.php on line 106

Warning: Illegal offset type in /mnt/web5/c0/58/51640958/htdocs/adam/wp-includes/nav-menu.php on line 107

Warning: Cannot modify header information - headers already sent by (output started at /mnt/web5/c0/58/51640958/htdocs/adam/wp-includes/nav-menu.php:106) in /mnt/web5/c0/58/51640958/htdocs/adam/wp-includes/option.php on line 571

Warning: Cannot modify header information - headers already sent by (output started at /mnt/web5/c0/58/51640958/htdocs/adam/wp-includes/nav-menu.php:106) in /mnt/web5/c0/58/51640958/htdocs/adam/wp-includes/option.php on line 572

The lines stated in nav-menu.php is as followed:

function register_nav_menu( $location, $description ) {
    register_nav_menus( array( $location => $description ) );
}

I'm not sure what the issue is.. I assume it has something to do with wordpress not able to register the navigator or something in that direction... how do I go about fixing this?

// EDIT:

Code in my functions.php:

function register_menus() {
    register_nav_menu( array('top_menu' => 'Top menu')
    );
}

And header.php:

<?php 
                    wp_nav_menu( array(
                        'menu'       => 'top_menu',
                        'depth'      => 2,
                        'container'  => false,
                        'menu_class' => 'nav',
                        'fallback_cb' => 'wp_page_menu',
                        //Process nav menu using our custom nav walker
                        'walker' => new wp_bootstrap_navwalker())
                    );
                ?>

display_element should call parent

Hello,

I think (in order to promote code reuse and avoid compatability issues) display_element should just make the check for children elements and then return control to the parent class. So something like (sorry, I was to lazy to make a pull request):

function display_element( $element, &$children_elements, $max_depth, $depth, $args, &$output ) {
        if ( !$element )
            return;

        $id_field = $this->db_fields['id'];

        //display this element
        if ( is_object( $args[0] ) )
           $args[0]->has_children = ! empty( $children_elements[$element->$id_field] );

        parent::display_element($element, $children_elements, $max_depth, $depth, $args, $output);
    }

Downdown On First Menu Item Only

I tried to implement your menu dropdowns. However, the submenu appears only on first nav item. The dev site is here: http://dev.riverroadcoffees.com/
I've attached a screenshot of the wordpress menu. I've copied and pasted everything exactly from the main page. Any help would be appreciated. Thanks.

_EDIT_*
ALL the dropdowns show when i'm logged into wordpress. However, when not logged in, the don't appear.

Caret in Submenu

Hi,

I used your navwalker and found that in submenu which has items, there's an caret which make it double carets (▼ and ►).

Parent clickable and mobile expanded

How can i make the parant clickable? now the parent has the link # and when in mobile every thing should be expanded so i can see parents children and be able to click parent in mobile?

is that possible?

This plugin can not pass the test from wptest.io .

Please try this test file:
http://wptest.io/

The test from above site would pass when I use default wp_nav_menu.

search field and right nav

Thank you for great work. I want to add search box and right aligned link items to menu look like bootstrap example > http://getbootstrap.com/components/#navbar

how to do that?

The new version (2.0.1) doesn't work for me

This bug happens on Wordpress 3.6

Please take a look at my screenshot. The problem here is wp_nav_menu generate div class="nav navbar-nav" instead of ul class="nav navbar-nav". Here is the full html :

and here is my header.php :

iPad (and iOS devices?) needs href

Hello,

I had to add :

$attributes .= ! empty( $item->url ) ? ' href="' . esc_attr( $item->url ) .'"' : '';
// FOR IPAD
$attributes .= empty( $item->url ) ? ' href="#"' : '';

in start_el function, because drop downs will not work on an "a" element without an href attribute declared, on an iPad 1 with iOS 5.1.1.

Customized to Bootstrap 3 RC2

Hi, have changed the code to work with version 3 RC 2. Here it is:

/**

• Class Name: wp_bootstrap_navwalker
• GitHub URI: https://github.com/twittem/wp-bootstrap-navwalker
• Description: A custom WordPress nav walker class to implement the Twitter Bootstrap 2.3.2 navigation style in a custom theme using the WordPress built in menu manager.
• Version: 1.4.3
• Author: Edward McIntyre - @twittem
• License: GPL-2.0+
• License URI: http://www.gnu.org/licenses/gpl-2.0.txt
  */

class wp_bootstrap_navwalker extends Walker_Nav_Menu {

/**
 * @see Walker::start_lvl()
 * @since 3.0.0
 *
 * @param string $output Passed by reference. Used to append additional content.
 * @param int $depth Depth of page. Used for padding.
 */
function start_lvl( &$output, $depth = 0, $args = array() ) {
    $indent = str_repeat( "\t", $depth );
    $output    .= "\n$indent<ul class=\"dropdown-menu\">\n";        
}

/**
 * @see Walker::start_el()
 * @since 3.0.0
 *
 * @param string $output Passed by reference. Used to append additional content.
 * @param object $item Menu item data object.
 * @param int $depth Depth of menu item. Used for padding.
 * @param int $current_page Menu item ID.
 * @param object $args
 */

function start_el( &$output, $item, $depth = 0, $args = array(), $id = 0 ) {
    global $wp_query;
    $indent = ( $depth ) ? str_repeat( "\t", $depth ) : '';

    /**
     * Dividers & Headers
     * ==================
     * Determine whether the item is a Divider, Header, or regular menu item.
     * To prevent errors we use the strcasecmp() function to so a comparison
     * that is not case sensitive. The strcasecmp() function returns a 0 if 
     * the strings are equal.
     */
    if (strcasecmp($item->title, 'divider') == 0) {
        // Item is a Divider
        $output .= $indent . '<li class="divider">';
    } else if (strcasecmp($item->title, 'divider-vertical') == 0) {
        // Item is a Vertical Divider
        $output .= $indent . '<li class="divider-vertical">';
    } else if (strcasecmp($item->title, 'dropdown-header') == 0) {
        // Item is a Header
        $output .= $indent . '<li class="dropdown-header">' . esc_attr( $item->attr_title );
    } else {

        $class_names = $value = '';
        $classes = empty( $item->classes ) ? array() : (array) $item->classes;
        $classes[] = ($item->current) ? 'active' : '';
        $classes[] = 'menu-item-' . $item->ID;
        $class_names = join( ' ', apply_filters( 'nav_menu_css_class', array_filter( $classes ), $item, $args ) );

        if ($args->has_children && $depth > 0) {
            $class_names .= ' dropdown-submenu';
        } else if($args->has_children && $depth === 0) {
            $class_names .= ' dropdown';
        }

        $class_names = $class_names ? ' class="' . esc_attr( $class_names ) . '"' : '';

        $id = apply_filters( 'nav_menu_item_id', 'menu-item-'. $item->ID, $item, $args );
        $id = $id ? ' id="' . esc_attr( $id ) . '"' : '';

        $output .= $indent . '<li' . $id . $value . $class_names .'>';

        $attributes = ! empty( $item->target )     ? ' target="' . esc_attr( $item->target     ) .'"' : '';
        $attributes .= ! empty( $item->xfn )        ? ' rel="'    . esc_attr( $item->xfn        ) .'"' : '';
        $attributes .= ! empty( $item->url )        ? ' href="'   . esc_attr( $item->url        ) .'"' : '';
        $attributes .= ($args->has_children)        ? ' data-toggle="dropdown" class="dropdown-toggle"' : '';

        $item_output = $args->before;

        /**
         * Glyphicons
         * ===========
         * Since the the menu item is NOT a Divider or Header we check the see
         * if there is a value in the attr_title property. If the attr_title
         * property is NOT null we apply it as the class name for the glyphicon.
         */
        if(! empty( $item->attr_title )){
            $item_output .= '<a'. $attributes .'><i class="' . esc_attr( $item->attr_title ) . '"></i>&nbsp;';
        } else {
            $item_output .= '<a'. $attributes .'>';
        }

        $item_output .= $args->link_before . apply_filters( 'the_title', $item->title, $item->ID ) . $args->link_after;
        $item_output .= ($args->has_children && $depth == 0) ? ' <b class="caret"></b></a>' : '</a>';
        $item_output .= $args->after;

        $output .= apply_filters( 'walker_nav_menu_start_el', $item_output, $item, $depth, $args );
    }
}

/**
 * Traverse elements to create list from elements.
 *
 * Display one element if the element doesn't have any children otherwise,
 * display the element and its children. Will only traverse up to the max
 * depth and no ignore elements under that depth. 
 *
 * This method shouldn't be called directly, use the walk() method instead.
 *
 * @see Walker::start_el()
 * @since 2.5.0
 *
 * @param object $element Data object
 * @param array $children_elements List of elements to continue traversing.
 * @param int $max_depth Max depth to traverse.
 * @param int $depth Depth of current element.
 * @param array $args
 * @param string $output Passed by reference. Used to append additional content.
 * @return null Null on failure with no changes to parameters.
 */

function display_element( $element, &$children_elements, $max_depth, $depth, $args, &$output ) {
    if ( !$element ) {
        return;
    }

    $id_field = $this->db_fields['id'];

    //display this element
    if ( is_object( $args[0] ) ) {
       $args[0]->has_children = ! empty( $children_elements[$element->$id_field] );
    }

    parent::display_element($element, $children_elements, $max_depth, $depth, $args, $output);
}

}

You have to use "dropdown-header" for headers.

Thanks!!!

How to keep the submenu opened when clicking thru submenu voices

hi,
first and foremost thanks for your great code.
My problem is: i open a submenu, i click on the submenu voice and then when the page is reloaded the submenu is closed again, but i'd need to keep that submenu opened . I'd need to fix this as my customer asked me for a horizontal submenu - which i achieved via css.

My menu code is this:
http://pastebin.com/DNybHXmC

(the backup query is there for other purposes...)

how can i achieve the aforementioned result?
thanks in advance for your reply :)

Not working when menu does not exists

I want to show the pages if there is no menu selected but I get some errors starting at line 48.
Notice: Trying to get property of non-object in C:\xampp\htdocs\wp-content\themes\the_theme\inc\twitter_bootstrap_nav_walker.class.php on line 48

I'm using WP 3.5.1

add brand for the first element

Hello and thank you for your great custom navbar, it helped me a lot.
I'm just wondering if it's possible to add the brand tag for the first element.
How can i do that?

collapse wont work properly

I noticed that after i expand the collapsable menu (in the small and extra small screen) it wont collapse again if i click on the button

is that a known issue or i'm doing something wrong?

P.

Multi-level?

Anything specific I need to do for multi-level menus? My menu can sometimes be 3 levels deep, but this walker seems to be stuck at 2.

The drop down class is added to the widget menus also

I just realized the drop-down class is added to the regular widget menu and i just want this setup for my top page navigation,

Dropdown not working

Hi,

I can able to view the dropdown icon. But on hover or click the sub menu is not opening. Could you please guide me how to do that.

Buttons

Any thoughts on adding button functionality (button dropdowns etc.)?

Warning/Errors upon upgrade to 3.6

Getting the following messages after upgrading to 3.6:

Strict Standards: Declaration of wp_bootstrap_navwalker::start_lvl() should be compatible with Walker::start_lvl(&$output, $depth = 0, $args = Array) in wp_bootstrap_navwalker.php on line 143

Warning: Cannot modify header information - headers already sent by (output started at wp_bootstrap_navwalker.php:143) in wp-includes/option.php on line 571

Warning: Cannot modify header information - headers already sent by (output started at wp_bootstrap_navwalker.php:143) in wp-includes/option.php on line 572

how can i add search box in navigation

i want to add search box to nav bar how can i do that

not only style of that that should work when we search

Strict Standards Error bootstrap navwalker

Hi there

Just thought I should bring these issues to your attention.

I've been trying this in a theme but I got the following error:

Strict Standards: Declaration of wp_bootstrap_navwalker::start_lvl() should be compatible with Walker_Nav_Menu::start_lvl(&$output, $depth = 0, $args = Array) in .../wp-content/themes/flat-portfolio/wp_bootstrap_navwalker.php on line 143

I was told on WordPress Answers that It means:

It means that the declaration of the start_lvl method in wp_bootstrap_navwalker should match the declaration of the method in Walker_Nav_Menu. It doesn't.

function start_lvl( &$output, $depth ) {
VS.

function start_lvl( &$output, $depth = 0, $args = array() ) {
Make the arguments match exactly and you should be fine.

Also I get Notice: Trying to get property of non-object errors with wp-debug set to true if the menu is not set. Please let me know how I can fix this.

Thanks and best

Adding a navform to the walker class

This walker class class is awesome!

Is there a way to add a nav-form to this code in the following way ?

[nav]
[div]
WALKER CLASS LIST GENERATED NAV LIST
include ('searchform-navbar.php');
[/div]
[/nav]

Divider element inserting extra <li>

Hi

I've noticed that when I add a divider element to the menu, the output contains an extra </li> and messes up the layout, not to mention a validation error.

Here's a shot of the menu structure:

Here's the output:

<nav class="pull-right dropdown">
    <ul id="menu-main" class="nav nav-pills">
        <li id="menu-item-88" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-88 dropdown">
            <a href="" data-toggle="dropdown"
            data-target="#" class="dropdown-toggle"> <span class="caret"></span>
            </a>
            <ul class="dropdown-menu">
                <li id="menu-item-84" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-84">
                    <a href=""></a>
                </li>
                <li class="divider"></li>
        </li>
        <li id="menu-item-147" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-147">
            <a href=""></a>
        </li>
        <li id="menu-item-236" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-236">
            <a href=""></a>
        </li>
        <li id="menu-item-295" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-295">
            <a href=""></a>
        </li>
        </ul>
        </li>
        <li id="menu-item-72" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-72">
            <a href=""></a>
        </li>
        <li id="menu-item-66" class="highlight menu-item menu-item-type-post_type menu-item-object-page menu-item-66">
            <a href=""></a>
        </li>
    </ul>
</nav>

Now according to the W3C validator, the </li> just before <li id="menu-item-72"> is and "end tag for element "LI" which is not open."

When I remove the Divider from the Wordpress menu, the validation error is gone. I've never really understood how the Walker works, so I have no clue what's going on here - any advice?

Thanks!

REAME.md #navbar-fixed-top

The working code example doesn't need to be enclosed in PHP tags seeing as it's HTML with PHP used inline. Copying and pasting this example into a theme verbatim will throw and error or two.

How to make top menu clickable of drop down menu

I created website with wp-bootstrap-navwalker ,but how can i create top menu clickable .
http://newbury.viprecipe.com/01/
Here is my link
i want to family support and childcare clickable

Menu attribute is being added to <span class="glyphicon...

It seems the plugin is hijacking the title attribute (the field you can edit in the menu structure admin).

For instance if I add "Find out more about our services" to a menu item named "About" the source looks like this:

<a href="http://mysite.com/about/" title="About">
<span class="glyphicon Find out more about our services"></span>
 About
</a>

Also the navigation label ends up in the title attribute.

Ideally the mark up should look like this:

<a href="http://mysite.com/about/" title="Find out more about our services">
<span class="glyphicon"></span>
 About
</a>

Dropdown not working (upon click) in Bootstrap 3.0.3

Sorry to bring up a closed issue, but the dropdown is not working (upon click) with Bootstrap 3.0.3 for me either. Dropdown js is already included in bootstrap.js, and all js loads fine.
Any suggestions? I really appreciate it.

(Didn't have this problem in previous 3.0-versions.)

2nd level not working on iPhone

On my installation the 2nd level doesn't work. When expanding the first level dropdown the page reloads (it seems) and the menu isn't clickable. When clicking the menu collapse and the 1st level links are clickable again. See test URL: http://bok.hoi.se/menu-bug

Bug with WP 3.8 ???

Hi
I've test this class with WP 3.6 and 3.7 successfully but now it's seems to have some trouble to generate correctly the menu with WP 3.8 :

• container_class and container_id is missing
• All item is empty like
  ......

Wrong parent being marked active

The navwalker is working very well, however I am having a problem with an incorrect menu item being marked as active. I'm using the Events Manager plugin, which stores events as custom post types.

When I view a single event, the page currently selected as the 'posts page' is marked as active. Could you give me a hint as to how to troubleshoot this? Thanks.

EDIT: Sorry, I've managed to figure out that it's not a navwalker issue!

navbar is hide when we are login

there is wordpress admin navbar which help as navigate between public site and admin area but when we use fixed top navigation class our navbar is at the backside of wordpress nav bar how to fix that problem.

and thank's from your nice work.

Active Menu Issue

I tried to use Post Category into the Menu and while reading a post, its category does not gets selected (active class) into the menu.

navbar-right

Hi, nice work, thanks for sharing! I was wondering if there was a way to make a link with ul class: navbar-right? Kinda like a Login link flush-right...

http://getbootstrap.com/components/#navbar-default

Thanks

How can I change color of navbar

I want to change the color of navbar how can i do that there is just two color navbar-inverse and the default one but i want to have orange color.

child theme support

Did something similar, then tried with your class as well.

Seems if you define the class in a parent themes functions.php, then enable a child theme of that parent with nothing fancy except the child style.css. All the nav items are empty.

Curious if you know why?

Multilevel Dropdown

Hello. There's something that has been boggling my mind a bit and that is multilevel dropdowns. I've never really needed it before but now that i am building an online store for a retail company and I need 3-4 levels. I've looked around but have only found CSS alternatives that don't work in mobile. I know this may be a more bootstrappy question but I figured that it would be something nice to add to your nav walker. What are your thoughts on this?

nav-justified issue

Hi there is a glitch in mobile button slider, the submenu does drop down but not in smaller window on the left like in standard menu.

Here is jsfiddle result
http://jsfiddle.net/voviklenin/Ctw4q/4/

Is there a missing "?>" at the end of /wp_bootstrap_navwalker.php?

Fix Multi Level Bootstrap Menu and Open on Mouse Hover

Thanks for awesome work,
A. but there's an issue in multi level menu (it's not open) ..
replace line:
if($args->has_children) { $class_names .= ' dropdown'; }
with:
if($args->has_children && $depth === 0) { $class_names .= ' dropdown'; } elseif($args->has_children && $depth > 0) { $class_names .= ' dropdown-submenu'; }

B. Hover Dropdown Menu
To open menu on hover use (bootstrap-hover-dropdown.js) from (CWSpear) and ..
replace line:
$atts['data-toggle'] = 'dropdown';
with:
$atts['data-hover'] = 'dropdown';

and thanks again for your work and your time .. hope to help

Dividers

The word "Divider" has to be in the "Title Attribute" field or else it won't work.
The code seems to say the same thing:

Line 49: $item->attr_title, 'divider'

Therefore, the documents should say:

...a Link Text or Title Attribute of divider...

Ability to use "dropup" class for menu items with submenus

I've tried to use the "theme_location" argument to change "dropdown" class by "dropup" but I get the following error when "theme_location" is specified:

Notice: Trying to get property of non-object in /path/to/wp_bootstrap_navwalker.php on line 67

It would be great for footer menus.

Flat menu's getting wrong class

Superb class you have here. Worked wonders for my theme.
There's a problem however when I request a menu with a depth of 1. A menu item with sub items still shows the down arrow icon and doesn't link to the page.
For instance if I have:
/our-company
--> /history
--> /staff
etc. the main menu works great but I have another call to that menu in the footer that's flat. The our-company link should link to the parent page instead of do nothing.

I can of course create a separate menu in the admin but thought I'd point this out.

Menu item with child/sub menus is not clickable

Hi, thank you for excellent solution. My question is why menu item isn't clickable if he has submenu items? How solve that?

Tnx in advance!

Caret are added in the last depth level too

Bootstrap 3.0 (and this walker as a consequence) supports only 2 levels deep menus. The problem is that there isn't any check on menu $depth to avoid the class adding carets in the last available level.

Please fix this.

Big changes on the road to 3.0

Introduction

I have been blown away with the popularity of wp-bootstrap-navwalker and the people contributing to the project. Originally, wp-bootstrap-navwalker was built to serve my specific development needs and solve the simple problem of adding Bootstrap menus to WordPress.

As usage grows, so do the feature requests. To this point I have been reluctant to add additional features in an effort to keep things simple but I do think there is value in creating so complimentary add-ons to introduce more features. To achieve this I will be doing a complete rewrite.

The Plan

The plan is to create a modular walker framework that achieves the base functionality needed to implement Bootstrap 3.0 menus with extensibility to create add-on modules.

The add-on modules will be disabled by default and can be turned on by calling a public function similar to this:

if ( class_exists( 'WP_Bootstrap_Navwalker' ) ) {
    WP_Bootstrap_Navwalker::add_addon_support( array( 
        'multi-level-dropdown',
        'nav-list' )
    );
}

This way we avoid loading additional bloat into our sites while adding additional featured to the mix. Right away I see addons for multi level dropdowns, and abstracting the glyphicons functionality to an add-on aswell.

Two Pronged Solution

The ideal situation is to develop this as a drop in library for theme developers to integrate into their theme or framework. Aswell as a plugin where you can turn on and off individual framework options.

The beauty of taking the time to also create a plugin is this will also give us utility classes needed to easily add the framework options to our themes as well.

Technical Considerations

Ideally this would be achieved while adding the least additional HTTP requests as possible. Understanding that some add-ons may require additional .less & .js files I think it is important to compile and minify all of out resources into single .css & .js files.

This is a large consideration that may be difficult to achieve, although with libraries like Grunt this may be possible. I think its worth taking a look at and may be a plugin of its own. I would love a plugin that would take all of the .less, .css & .js files from my theme/plugins and package and minify them nicely.

Yes, this would be beautiful.

if ( class_exists( 'Gruntify' ) ) {
    Gruntify::add_less( array( 
        '../less/style.less' )
    );
        Gruntify::add_js( array( 
        '../js/awesomeness.js' )
    );
} else {
      // Enqueue normally
}

Feedback

I would love to know what you all think about this direction.

Especially you amazing contributors:
@claudiosmweb
@mindctrl
@pattonwebz
@cvrebert
@mafuba
@wboptimise
@mharis

IE 8 only shows Collapsed Mode

I'm having a strange issue in IE8 where the menu is only showing up in the collapsed mode. I can click the button, and it expands to show the menu items, and they work - but the normal menu view is not working, even when the page is expanded to full screen.
I am wondering if anybody else has had this issue.

Ability to have dropdown be split button eg link / caret

On sites like Font Awesome, their main nav functions like this:

1. The parent links are all clickable to a primary page, eg "icons" just goes to the icons page
2. The dropdowns are activated by clicking the caret.

Example of the split button: http://getbootstrap.com/components/#btn-dropdowns-split

This would be a great addition, I am guessing though it would have to be specified somehow as there's no way to know if it should build the standard dropdown, or a split button.

I am no PHP programmer, so while I can help with bootstrap html/css, making it actually work is out of my reach /cry. I am happy to take part in trying ot make this a feature though and plan to experiment with it a bit and see if I can at least run in to some useful errors.

Please respond here if you have more questions on my use case.

Not Working on the Online Server but work well on localhost

Hi Edward, sorry to disturb your day,
I'm using your walker function to my wp themes, i'ts working well on the local server.
But sadly it's not working when I make it online ( http://greenlotresidence.com )
Where did i go wrong ?

Dropdown clicks not working

First of all, I don't know if this is something related to the theme I'm developing, your script or any other thing.

I'm using this script to implement a Bootstrap theme in Wordpress. Everything works fine in the menus, except the click on the one that have submenus. When I click it, the "open" class is not added to the 'li class="dropdown"' part.

I have done everything according to the instructions in this repository, but this is not working. I can't tell if it's related to this or any Javascript bits.

Best regards;
Bruno Miguel

Support for sub-headings

Thank you for making this available! It really helped me out.

You included functionality for the dividers (thank you!) but not the sub-headings, as far as I can tell. I ended up adding that functionality myself, in case anyone else would be interested in what I did.

I changed this if statement:
if (strcasecmp($item->title, 'divider') && strcasecmp($item->title, 'heading')) {

And the else statement:
} elseif (strcasecmp($item->title, 'heading')) { /* it's a divider */ $output .= $indent . '<li class="divider">'; } else { /* it's a sub-heading */ $output .= $indent . '<li class="nav-header">' . esc_attr( $item->attr_title ); }

Then you can use the headings by putting the word heading in the menu item label and the actual heading text in the title attribute.

This seems to be working for me, however, I'm no expert, so there may be a better way. But this may help someone out, so I wanted to share it.

Cheers!