I have a custom post type (“site”) that I’m using to display our clients, and I am trying to add a custom meta box to the add/edit site page. I’m using the sample from the WordPress codex (http://codex.wordpress.org/Function_Reference/add_meta_box) and I’m able to get the title of the meta box to show up in the add/edit site page, but there’s no text box to enter the website URL.

Here is the code I have:

<?php
// Add the Meta Box
/* function nw_add_custom_meta_box() {
    add_meta_box(
        'website', // $id
        'Website', // $title 
        'show_custom_meta_box', // $callback
        'site', // $page
        'normal', // $context
        'high'); // $priority
}
add_action('add_meta_boxes', 'nw_add_custom_meta_box');
*/
/**
 * Adds a box to the main column on the Post and Page edit screens.
 */
function nw_add_custom_meta_box() {
    $screens = array( 'site' ); // add items to add to multiple post types
    foreach ( $screens as $screen ) {
        add_meta_box(
        'website', // $id
        'Website', // $title 
        'show_custom_meta_box', // $callback
        $screen, // $page
        'normal', // $context
        'high' // $priority
        );
    }
}
add_action( 'add_meta_boxes', 'nw_add_custom_meta_box' );
/**
 * Prints the box content.
 * 
 * @param WP_Post $post The object for the current post/page.
 */
function myplugin_meta_box_callback( $post ) {
    // Add an nonce field so we can check for it later.
    wp_nonce_field( 'website', 'website_nonce' );
    /*
     * Use get_post_meta() to retrieve an existing value
     * from the database and use the value for the form.
     */
    $value = get_post_meta( $post->ID, '_website', true );
    echo '<label for="website">';
    _e( 'Website Address', 'myplugin_textdomain' );
    echo '</label> ';
    echo '<input type="text" id="website" name="website" value="' . esc_attr( $value ) . '" size="25" />';
}
/**
 * When the post is saved, saves our custom data.
 *
 * @param int $post_id The ID of the post being saved.
 */
function nuggetweb_save_meta_box_data( $post_id ) {
    /*
     * We need to verify this came from our screen and with proper authorization,
     * because the save_post action can be triggered at other times.
     */
    // Check if our nonce is set.
    if ( ! isset( $_POST['website_nonce'] ) ) {
        return;
    }
    // Verify that the nonce is valid.
    if ( ! wp_verify_nonce( $_POST['website_nonce'], 'website' ) ) {
        return;
    }
    // If this is an autosave, our form has not been submitted, so we don't want to do anything.
    if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) {
        return;
    }
    // Check the user's permissions.
    if ( isset( $_POST['post_type'] ) && 'page' == $_POST['post_type'] ) {
        if ( ! current_user_can( 'edit_page', $post_id ) ) {
            return;
        }
    } else {
        if ( ! current_user_can( 'edit_post', $post_id ) ) {
            return;
        }
    }
    /* OK, it's safe for us to save the data now. */
    // Make sure that it is set.
    if ( ! isset( $_POST['website'] ) ) {
        return;
    }
    // Sanitize user input.
    $my_data = sanitize_text_field( $_POST['website'] );
    // Update the meta field in the database.
    update_post_meta( $post_id, '_website', $my_data );
}
add_action( 'save_post', 'nuggetweb_save_meta_box_data' );
?>

Read more here: WordPress Meta Box for custom post type


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