Support » Plugins » Strange behaviour of add_submenu_page() / add_menu_page()

  • Resolved Robert Heller


    I am in the process of re-coding a simple plugin to use a classes, instead of a random collection of global functions and variables. I am also coding it to use the WP_List_Table class. I have encounterer a very strange problem. I am sure it is a simple typo in my code somewhere, but I cannot find it. I expect that a fresh set of eyes will spot the problem.

    The plugin adds two main admin menu items, each with one sub-menu item. The first menu item is created fine, but its sub-menu item is created wrong. The second menu item and its sub-menu item are both created properly. I am using a class member function to display the admin pages (the function argument for both calls to add_menu_page and both calls to add_submenu_page is of the form array( $this, ‘member_function_name’ ), and for the both main menu items and the second sub-menu item, the URL generated is of the form /wp-admin/admin.php?page=slug, but for the first sub-menu the URL is /wp-admin/slug and I cannot figure out why it is doing that. I even tried creating a fresh wordpress site on my test server, and the same thing happens as on my proper test site on my test server.

    I have what I have so far available at the URL

    (Note: the plugin is not finished — only the first page (FM Show Sched) is ‘complete’ (but not fully debugged). The problem is with the ‘Add New’ sub-page for FM Show Sched. The FM Open Mics page and its sub-page are not written yet — there will be an error about require_once failing — this is because I haven’t written that code yet!

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  • BTW: I am using WP 3.1.2 on a 64-bit (x86_64) Linux machine (CentOS 5.6, httpd-2.2.3-45.el5.centos.1, php-5.1.6-27.el5_5.3, mysql-5.0.77-4.el5_5.5).

    Found the problem: it seems that using add_action(‘_admin_menu’ …) is not the right thing to do, changing it to add_action(‘admin_menu’ …) solves the problem. Weird… The example code I was looking at used add_action(‘_admin_menu’ …), but now I suspect that the example code is wrong on some level (there are other things wrong with it as well).

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