Finding menu item ID

Question

How to find a menu item pointing to the specific node?

On node creation I want to create a main_menu link for the node. With menu_rules it is relatively easy. The problem arises when the parent element can differ.

main_menu
Groups
-[GROUPS]
--[GROUP_CONTENT]

main_menu
...
Groups
-A
--a1
--a2
-B
--b1
-C
...

In the above case adding a new group D is easy - I simply add a menu item to 'Groups', but what if I would like to add a3? I know the name of A and I know what it is linking to (a node representing a group) but I don't know its randomly generated menu ID (for example [menu-1082]).

How do I find that Id?

Answer 1

I'm almost new user of Drupal, but I encountered the same problem because I write myself my modules. My need is to create a node and to insert it as submenu of a main menu Item. I solved my problem in this way:

I wrote this function

function mymodule_get_plid($menu_name , $name) {
    $menu = menu_tree_all_data($menu_name);
    foreach ($menu as $item => $menuitem) {
        if ($name == $menuitem['link']['link_title']) {
            return $menuitem['link']['mlid'];
            break;  
        }
    }
    return false;
}

where $menuname is a string like 'main-menu', $name is the menu item for which I'm searching for it's Id. Function return Id if it find $name, false otherwise.

Now to complete node creation i wrote this.

$node = new stdClass();
$node->title = "YOUR TITLE";
$node->type = "page";  // Creating a node of Basic page type
node_object_prepare($node); // Sets some defaults. Invokes hook_prepare() and hook_node_prepare().
$node->language = LANGUAGE_NONE; // Or e.g. 'en' if locale is enabled
$node->uid = $account->uid;
$node->status = 1; //(1 or 0): published or not
$node->promote = 0; //(1 or 0): promoted to front page
$node->comment = 0; // 0 = comments disabled, 1 = read only, 2 = read/write

$node->menu['enabled'] = TRUE;
$node->menu['menu_name'] = 'main-menu';
$node->menu['plid'] = mymodule_get_plid('main-menu' , 'Inquiries');
$node->menu['link_title'] = 'MY SUBMENU NAME';
$node->menu['description'] = ''; // Needed even if empty to avoid notices.  /*  

$node = node_submit($node); // Prepare node for saving
node_save($node);

Now all behaves well, "MY SUBMENU NAME" is created as a new node and appended as sub menuitem of the 'Inquiries' menu Item of the main menu.

Answer 2

Edit that menu item in your menu admin page, the id is in the URL of the menu item edit page. In most of cases you'll also find the ID of your menu item as a class of the <a> link.

EDIT :

You can either use menu_get_item if you know the path of A, or a db_select on the menu_links table filtering on the path.

Answer 3

To get the ID I query the db using the bellow function. As an argument it takes node id of the content and it returns id of the menu item for the parent group.

function mymodule_get_fathers_menu_item($nid){
    $node = node_load($nid);
    $fathers_gid = mymodule_get_father($node);
    $fathers_nid = mymodule_get_nid_from_gid($fathers_gid);
    $father_node_link = "node/".$fathers_nid;

    $query = db_select('menu_links');
    $query->addfield('menu_links','mlid','mlid');
    $query->condition('link_path', $father_node_link,'=');

    $results = $query->execute();
    $result = $results->fetchAssoc();

    //drupal_set_message($result['mlid']);

    return ("main-menu:".$result['mlid']) ;
}

I then use "Create a menu item for node" action from menu_rules module with the parent parameter as PHP code.

return windbench_get_fathers_menu_item( $value );

and data selector set for node:nid.

My code does not work on node creation (probably something to do with when the og data are saved) so I trigger it on node edit (after publishing).