WordPress: Disable “Add New” on Custom Post Type

问题:

Is there any way to disable the option of adding a new post under a Custom Post Type in WordPress (3.0)? I've looked into labels and arguments but can't find anything that would resemble such a feature.

回答1:

Full credit to Seamus Leahy

There is a meta capability create_posts that is not documented but is used by WordPress to check before inserting the various 'Add New' buttons and links. In your custom post type declaration, add capabilities (not to be confused with cap) and then set it to false as below.

register_post_type( 'custom_post_type_name', array(
  'capability_type' => 'post',
  'capabilities' => array(
    'create_posts' => 'do_not_allow', // false < WP 4.5, credit @Ewout
  ),
  'map_meta_cap' => true, // Set to `false`, if users are not allowed to edit/delete existing posts
));

May I ask why you want to do this?

I would at first have suggested changing the capabilities for your custom post type, but I don't think there's one that limits who can add posts, but only who can edit or publish them.

It looks a little dirty, but you could try unsetting the item in the $submenu global;

function hide_add_new_custom_type()
{
    global $submenu;
    // replace my_type with the name of your post type
    unset($submenu['edit.php?post_type=my_type'][10]);
}
add_action('admin_menu', 'hide_add_new_custom_type');

回答2:

There is a meta capability create_posts that is not documented but is used by WordPress to check before inserting the various 'Add New' buttons and links. In your custom post type declaration, add capabilities (not to be confused with cap) and then set it to false as below.

register_post_type( 'custom_post_type_name', array(
  'capability_type' => 'post',
  'capabilities' => array(
    'create_posts' => false, // Removes support for the "Add New" function ( use 'do_not_allow' instead of false for multisite set ups )
  ),
  'map_meta_cap' => true, // Set to `false`, if users are not allowed to edit/delete existing posts
));

回答3:

The combinations of the solutions above work in hiding the links (although someone could quite easily type the URL in directly.

The solution mentioned @PavelChernov relies on get_post_type() which will only work if there is already a post in the listing. If there are no posts, the function will not return anything, and the "Add New" link will be available. An alternative method:

function disable_new_posts() {
    // Hide sidebar link
    global $submenu;
    unset($submenu['edit.php?post_type=CUSTOM_POST_TYPE'][10]);

    // Hide link on listing page
    if (isset($_GET['post_type']) && $_GET['post_type'] == 'CUSTOM_POST_TYPE') {
        echo '<style type="text/css">
        #favorite-actions, .add-new-h2, .tablenav { display:none; }
        </style>';
    }
}
add_action('admin_menu', 'disable_new_posts');

EDIT: To prevent direct access if someone types the URL in themselves: https://wordpress.stackexchange.com/a/58292/6003

回答4:

In wordpress and for all the post types there is the capability create_posts. This capability is used in several core files :

1. wp-admin\edit-form-advanced.php
2. wp-admin\edit.php
3. wp-admin\includes\post.php
4. wp-admin\menu.php
5. wp-admin\post-new.php
6. wp-admin\press-this.php
7. wp-includes\admin-bar.php
8. wp-includes\class-wp-xmlrpc-server.php
9. wp-includes\post.php

So if you really want to disable this feautere you must do it per role and per post type. I use the great plugin "User Role Editor" to manage the capabilities per role.

But what about the capability create_posts? Well this capability is not mapped and also create_posts is equal to create_posts so we should fix this and map the capability per post type.

So you can add this piece of code in your functions.php and the you can manage this capability.

function fix_capability_create(){
    $post_types = get_post_types( array(),'objects' );
    foreach ( $post_types as $post_type ) {
        $cap = "create_".$post_type->name;
        $post_type->cap->create_posts = $cap;
        map_meta_cap( $cap, 1); 
    }
}
add_action( 'init', 'fix_capability_create',100);

So here we are not hiding or removing menu elements... here we are removing the capability for users (including xmlrpc requests).

The action was init and not admin_init or anything else because init at priority 100 prevents the display of "add new" on admin bar, sidebar, etc (in all the wp interface).

回答5:

add_action("load-post-new.php", 'block_post');

function block_post()
{
    if($_GET["post_type"] == "custom_type") 
        wp_redirect("edit.php?post_type=custom_type");
}

回答6:

WordPress Networks: I found that Seamus Leahy's answer doesn't work if you are logged in as a super admin of the network, it doesn't matter if the user doesn't have the capability, mapped or otherwise, when current_user_can($cap) is called by the CMS. By digging into the core I found you can do the following.

register_post_type( 'custom_post_type_name', array(
  'capability_type' => 'post',
  'capabilities' => array(
    'create_posts' => 'do_not_allow', // Removes support for the "Add New" function, including Super Admin's
  ),
  'map_meta_cap' => true, // Set to false, if users are not allowed to edit/delete existing posts
));

The accepted answer hides the menu item, but the page is still accessible.

回答7:

@ Staffan Estberg,

This is best way to hide the Add New or Create New button in custom postypes

'capability_type'    => 'post',

        'capabilities'       => array( 'create_posts' => false ),       

        'map_meta_cap'       => true,

It disable to create new post in custom post types both side in admin menu and above the list of post type.

回答8:

Disable creating new post for registered post-types: (example for post and page)

function disable_create_newpost() {
    global $wp_post_types;
    $wp_post_types['post']->cap->create_posts = 'do_not_allow';
    //$wp_post_types['page']->cap->create_posts = 'do_not_allow';
    //$wp_post_types['my-post-type']->cap->create_posts = 'do_not_allow';
}
add_action('init','disable_create_newpost');

回答9:

I found this simplest way for this. Just ad this code into theme’s function.php.

function hd_add_buttons() {
    global $pagenow;
    if (is_admin()) {
        if ($_GET['post_type'] == 'custom_post_type_name') {
            echo '<style>.add-new-h2{display: none !important;}</style>';
        }
    }
}
add_action('admin_head', 'hd_add_buttons');

回答10:

register_post_type( 'custom_post_type_name', array(
  'capability_type' => 'post',
  'capabilities' => array(
    'create_posts' => false, // Removes support for the "Add New" function 
  ),
  'map_meta_cap' => true, // Set to `false`, if users are not allowed to edit/delete existing posts
));

I hope it will help you. Many thanks !