How to Hard Code Custom menu items

Question

Is there any way that i can hard code the custom menu items when first theme installed? I am creating a theme which will automatically make some common pages when installed. So I need to know if I can also add them to Wordpress custom menu so client don't need to add them manually?

In other words: how to insert/create custom menu item programmatically?

Let me know if anything unclear. Guide to the appropriate codex page is welcome. Thanks!

---

update: tried code from here Targeting specific menu with wp_nav_menu_items

Menu registration:

function register_my_menus() {
  register_nav_menus(
    array('main-menu' => __( 'Main Menu' ) )
  );
}

add_action( 'init', 'register_my_menus' );

Template use:

<?php wp_nav_menu( array( 'theme_location' => 'main-menu' ) ); ?>

Code for adding new items:

function new_nav_menu_items($items) {
    if( $args->theme_location == 'main-menu' ){
    $homelink = '<li class="home"><a href="' . home_url( '/' ) . '">' . __('Home') . '</a></li>';
    $items = $homelink . $items;
    return $items;
    }
}
add_filter( 'wp_nav_menu_items', 'new_nav_menu_items', 10, 2 );

when adding the code for adding new items in nav menu in functions.php file nothings happens in menu page in admin panel but the current menu items are gone in site!

Answer 1

The Problem with your code is that its not actually adding the links to the menu and only to the menu's output, hence the use of a filter (add_filter) so you are just filtering the output of the menu in fact even if you don't have a menu your link will be shown with the code you are using. But to create a link and add it to a menu you can use this code:

$run_once = get_option('menu_check');
if (!$run_once){
    //give your menu a name
    $name = 'theme default menu';
    //create the menu
    $menu_id = wp_create_nav_menu($name);
    //then get the menu object by its name
    $menu = get_term_by( 'name', $name, 'nav_menu' );

    //then add the actuall link/ menu item and you do this for each item you want to add
    wp_update_nav_menu_item($menu->term_id, 0, array(
        'menu-item-title' =>  __('Home'),
        'menu-item-classes' => 'home',
        'menu-item-url' => home_url( '/' ), 
        'menu-item-status' => 'publish'));

    //then you set the wanted theme  location
    $locations = get_theme_mod('nav_menu_locations');
    $locations['main-menu'] = $menu->term_id;
    set_theme_mod( 'nav_menu_locations', $locations );

    // then update the menu_check option to make sure this code only runs once
    update_option('menu_check', true);
}

I commented all over to make it simpler.

To create a child page/sub page/second level menu (how ever you may call it), you just need to set the menu-item-parent-id in the new item for example:

//create the top level menu item (home)
$top_menu = wp_update_nav_menu_item($menu->term_id, 0, array( 
    'menu-item-title' =>  __('Home'),
    'menu-item-classes' => 'home',
    'menu-item-url' => home_url( '/' ), 
    'menu-item-status' => 'publish'
    'menu-item-parent-id' => 0,
    ));
//Sub menu item (first child)
$first_child = wp_update_nav_menu_item($menu->term_id, 0, array( 
    'menu-item-title' =>  __('First_Child'),
    'menu-item-classes' => 'home',
    'menu-item-url' => home_url( '/' ), 
    'menu-item-status' => 'publish'
    'menu-item-parent-id' => $top_menu,
    ));
//Sub Sub menu item (first child)
$Second_child = wp_update_nav_menu_item($menu->term_id, 0, array( 
    'menu-item-title' =>  __('Second_Child'),
    'menu-item-classes' => 'home',
    'menu-item-url' => home_url( '/' ), 
    'menu-item-status' => 'publish'
    'menu-item-parent-id' => $first_child,
    ));

also you can set the position by code with menu-item-position and i think its done like this:

• First item - 'menu-item-position' => 1
  • First item first child - 'menu-item-position' => 1
  • First item second child - 'menu-item-position' => 1
    • First item second child first child - 'menu-item-position' => 1
• Second item - 'menu-item-position' => 2
• 3rd item - 'menu-item-position' => 3
• 4th item - 'menu-item-position' => 4

Answer 2

Your original code is very close to the money and I seriously think the this long solution by @Bainternet (no offence) is overkill, so have a look at this instead:

function new_nav_menu_items($items, $args) {
    if( $args->theme_location == 'primary' ){
        $homelink = '<li class="home"><a href="' . home_url( '/' ) . '">' . __('Home') . '</a></li>';
        $items = $homelink . $items;
    }
    return $items;
}
add_filter( 'wp_nav_menu_items', 'new_nav_menu_items', 10, 2 );

Your only problem was that you were not returning $items after the function checked for the correct menu, and you were missing the second callback argument that was needed to make the check ($args).

Answer 3

There's a bug in Wordpress 3.4.2:

https://github.com/WordPress/WordPress/commit/ae96b842f9f55ecfb22da705a4902b9d25580259#wp-includes/nav-menu.php

You need to create the term relation manually:

$menu = wp_get_nav_menu_object('top menu');
$id = wp_update_nav_menu_item($menu->term_id, 0, $data);

if ($menu->term_id && (!is_object_in_term($id, 'nav_menu', (int)$menu->term_id))) {
    wp_set_post_terms($id, array((int)$this->id), 'nav_menu');
}

See https://gist.github.com/4148529 for an example of the Menu class for simple menu creation.

Answer 4

For information, current user has to got rights to add terms, my menu_items were created but not added in the table wp_terms_relationship before I add a call to wp_set_current_user(1);