How can I add dropdown widget/box to admin post page?

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I am trying to figure out how to add a dropdown widget to the post page. The reason I ask is because I would like to be able to have a few different post classes that the user can select while making a post that they can select.

I figure I can use post_class and define a few different classes and allow the user to use this as a post template.

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Has anyone done this before and could lead me in the right direction?

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2 comments

  1. Since this is very similar to post formats (see post-formats) I would use a custom taxonomy.

    That makes it easy to control the access level, and you get the meta box without writing extra code.

    enter image description here

    Then you insert the new post classes with a simple filter. Your theme must use the function post_class() – of course.

    Example:

    <?php # -*- coding: utf-8 -*-
/* Plugin Name: Post Class Taxonomy */

add_action( 'wp_loaded', 'register_post_class_taxonomy' );

function register_post_class_taxonomy()
{
    $caps = array(
        'manage_terms' => 'manage_options',
        'edit_terms'   => 'manage_options',
        'delete_terms' => 'manage_options',
        'assign_terms' => 'edit_others_posts',
    );

    $labels = array(
        'name'                       => 'Post Classes',
        'singular_name'              => 'Post Class',
        'search_items'               => 'Search Post Classes',
        'popular_items'              => 'Popular Post Classes',
        'all_items'                  => 'All Post Classes',
        'edit_item'                  => 'Edit Post Class',
        'view_item'                  => 'View Post Class',
        'update_item'                => 'Update Post Class',
        'add_new_item'               => 'Add New Post Class',
        'new_item_name'              => 'New Post Class',
        'separate_items_with_commas' => 'Separate Post Classes with commas',
        'add_or_remove_items'        => 'Add or remove Post Classes',
        'choose_from_most_used'      => 'Choose from the most used Post Classes',
    );
    $args = array (
        'rewrite'           => FALSE,
        'public'            => FALSE,
        'show_ui'           => TRUE,
        'labels'            => $labels,
        'capabilities'      => $caps,
        'show_in_nav_menus' => FALSE,
    );
    register_taxonomy( 'post_classes', 'post', $args );
}

add_filter( 'post_class', 'insert_custom_post_classes' );

function insert_custom_post_classes( $classes, $class = '', $post_ID = NULL )
{
    NULL === $post_ID && $post_ID = get_the_ID();

    $post = get_post( $post_ID );

    if ( ! is_object_in_taxonomy( $post->post_type, 'post_classes' ) )
        return $classes;

    if ( ! $post_classes = get_the_terms( $post_ID, 'post_classes' ) )
        return $classes;

    foreach ( $post_classes as $post_class )
        if ( ! empty ( $post_class->slug ) )
            $classes[] = 'post-class-' . esc_attr( $post_class->slug );

    return $classes;
}