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I would like to add a custom Metabox with HTML content in the screens New and Edit Posts/Pages ( /wp-admin/post.php?post=POST_ID&action=edit), so that I could display a list of editorial guidelines for my editors to follow.

I don't want to edit code in many different places to update the instructions. I am looking for something more universal that i can edit in one place. How can I achieve something like this?

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up vote 4 down vote accepted

Don't know any plugin for that. But it can be solved creating a custom plugin with the Settings API and a Custom Meta Box.

Adding a RichText Editor in the Settings Page


/* Plugin Name: Custom Editor in Settings Page */

add_action( 'admin_init', 'register_settings_wpse_57647' );

# Register settings
function register_settings_wpse_57647() 
        'Publishing Guidelines', 
        'Enter custom message', 

# Print settings field content
function print_text_editor_wpse_57647() 
    $the_guides = html_entity_decode( get_option( 'html_guidelines_message' ) );
    echo wp_editor( 
        array( 'textarea_name' => 'html_guidelines_message' ) 

Results in:
resulting settings

Adding a Meta Box to Posts/Pages

This will print the option saved in the Settings page.

add_action( 'add_meta_boxes', 'add_custom_box_wpse_57647' );

# Add Meta Boxes
function add_custom_box_wpse_57647() 
    foreach( array( 'post', 'page' ) as $cpt )
            __( 'Additional Guidelines', 'this_plugin_or_theme_textdomain' ),

# Prints the box content
function inner_custom_box_wpse_57647( $post ) 
    global $current_user;
    $the_guides = html_entity_decode( get_option ( 'html_guidelines_message' ) );
    echo '<h2>Howdy, ' . $current_user->display_name . '</h2>';
    echo "<div>$the_guides</div><br style='clear:both' />";

Results in:
resulting meta box

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I think what you are looking for is a metabox plugin... That way you would be able to add html boxes in post/edit screens


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Ehm, this plugin ask you to define the box by code, it's exactly what I don't want to do. – Bakaburg Jul 6 '12 at 17:59

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