wPeanuts “External Link” Meta Box
class wPeanuts_External_Link {
public function __construct() {
if ( is_admin() ) {
add_action( 'load-post.php', array( $this, 'init_metabox' ) );
add_action( 'load-post-new.php', array( $this, 'init_metabox' ) );
}
}
public function init_metabox() {
add_action( 'add_meta_boxes', array( $this, 'add_metabox' ) );
add_action( 'save_post', array( $this, 'save_metabox' ), 10, 2 );
}
public function add_metabox() {
add_meta_box(
'external_link',
__( 'External Link', 'wpeanuts' ),
array( $this, 'render_metabox' ),
'item',
'advanced',
'default'
);
}
public function render_metabox( $post ) {
// Add nonce for security and authentication.
wp_nonce_field( 'wpeanuts_nonce_action', 'wpeanuts_nonce' );
// Retrieve an existing value from the database.
$wpeanuts_item_url = get_post_meta( $post->ID, 'wpeanuts_item_url', true );
$wpeanuts_item_author = get_post_meta( $post->ID, 'wpeanuts_item_author', true );
$wpeanuts_item_author_url = get_post_meta( $post->ID, 'wpeanuts_item_author_url', true );
// Set default values.
if( empty( $wpeanuts_item_url ) ) $wpeanuts_item_url = '';
if( empty( $wpeanuts_item_author ) ) $wpeanuts_item_author = '';
if( empty( $wpeanuts_item_author_url ) ) $wpeanuts_item_author_url = '';
// Form fields.
echo '<table class="form-table">';
echo ' <tr>';
echo ' <th><label for="wpeanuts_item_url" class="wpeanuts_item_url_label">' . __( 'Item URL', 'wpeanuts' ) . '</label></th>';
echo ' <td>';
echo ' <input type="url" id="wpeanuts_item_url" name="wpeanuts_item_url" class="wpeanuts_item_url_field" placeholder="' . esc_attr__( 'https://...', 'wpeanuts' ) . '" value="' . esc_attr( $wpeanuts_item_url ) . '">';
echo ' </td>';
echo ' </tr>';
echo ' <tr>';
echo ' <th><label for="wpeanuts_item_author" class="wpeanuts_item_author_label">' . __( 'Item Author', 'wpeanuts' ) . '</label></th>';
echo ' <td>';
echo ' <input type="text" id="wpeanuts_item_author" name="wpeanuts_item_author" class="wpeanuts_item_author_field" placeholder="' . esc_attr__( '', 'wpeanuts' ) . '" value="' . esc_attr( $wpeanuts_item_author ) . '">';
echo ' </td>';
echo ' </tr>';
echo ' <tr>';
echo ' <th><label for="wpeanuts_item_author_url" class="wpeanuts_item_author_url_label">' . __( 'Item Author URL', 'wpeanuts' ) . '</label></th>';
echo ' <td>';
echo ' <input type="url" id="wpeanuts_item_author_url" name="wpeanuts_item_author_url" class="wpeanuts_item_author_url_field" placeholder="' . esc_attr__( '', 'wpeanuts' ) . '" value="' . esc_attr( $wpeanuts_item_author_url ) . '">';
echo ' </td>';
echo ' </tr>';
echo '</table>';
}
public function save_metabox( $post_id, $post ) {
// Add nonce for security and authentication.
$nonce_name = isset( $_POST['wpeanuts_nonce'] ) ? $_POST['wpeanuts_nonce'] : '';
$nonce_action = 'wpeanuts_nonce_action';
// Check if a nonce is set.
if ( ! isset( $nonce_name ) )
return;
// Check if a nonce is valid.
if ( ! wp_verify_nonce( $nonce_name, $nonce_action ) )
return;
// Check if the user has permissions to save data.
if ( ! current_user_can( 'edit_post', $post_id ) )
return;
// Check if it's not an autosave.
if ( wp_is_post_autosave( $post_id ) )
return;
// Check if it's not a revision.
if ( wp_is_post_revision( $post_id ) )
return;
// Sanitize user input.
$wpeanuts_new_item_url = isset( $_POST[ 'wpeanuts_item_url' ] ) ? esc_url( $_POST[ 'wpeanuts_item_url' ] ) : '';
$wpeanuts_new_item_author = isset( $_POST[ 'wpeanuts_item_author' ] ) ? sanitize_text_field( $_POST[ 'wpeanuts_item_author' ] ) : '';
$wpeanuts_new_item_author_url = isset( $_POST[ 'wpeanuts_item_author_url' ] ) ? esc_url( $_POST[ 'wpeanuts_item_author_url' ] ) : '';
// Update the meta field in the database.
update_post_meta( $post_id, 'wpeanuts_item_url', $wpeanuts_new_item_url );
update_post_meta( $post_id, 'wpeanuts_item_author', $wpeanuts_new_item_author );
update_post_meta( $post_id, 'wpeanuts_item_author_url', $wpeanuts_new_item_author_url );
}
}
new wPeanuts_External_Link;