Or, embed this snippet using GenerateWP WordPress Plugin.

Download

Clone

Meta Embedded Child Display 1

class sqpp_metabox_embedded_child_display {

	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(
			'sqpp-mb-embedded-child-display',
			__( 'Embedded Child Display', 'sqppcptmeta' ),
			array( $this, 'render_mb_embedded_child_display' ),
			'page',
			'side',
			'high'
		);

	}

	public function render_mb_embedded_child_display( $post ) {

		// Add nonce for security and authentication.
		wp_nonce_field( 'nonce_action', 'nonce' );

		// Retrieve an existing value from the database.
		$sqpp_embedded_child_display_select = get_post_meta( $post->ID, 'sqpp_embedded_child_display_select', true );

		// Set default values.
		if( empty( $sqpp_embedded_child_display_select ) ) $sqpp_embedded_child_display_select = '';

		// Form fields.
		echo '<table class="form-table">';

		echo '	<tr>';
		echo '		<th><label for="sqpp_embedded_child_display_select" class="sqpp_embedded_child_display_select_label">' . __( 'Select', 'sqppcptmeta' ) . '</label></th>';
		echo '		<td>';
		echo '			<select id="sqpp_embedded_child_display_select" name="sqpp_embedded_child_display_select" class="sqpp_embedded_child_display_select_field">';
		echo '			<option value="1" ' . selected( $sqpp_embedded_child_display_select, '1', false ) . '> ' . __( 'No Display', 'sqppcptmeta' ) . '</option>';
		echo '			<option value="2" ' . selected( $sqpp_embedded_child_display_select, '2', false ) . '> ' . __( 'Preview + Link', 'sqppcptmeta' ) . '</option>';
		echo '			<option value="3" ' . selected( $sqpp_embedded_child_display_select, '3', false ) . '> ' . __( 'Popup', 'sqppcptmeta' ) . '</option>';
		echo '			<option value="4" ' . selected( $sqpp_embedded_child_display_select, '4', false ) . '> ' . __( 'Info Box', 'sqppcptmeta' ) . '</option>';
		echo '			</select>';
		echo '			<p class="description">' . __( 'In case this page is a child page of a parent page, then the parent page can display this page as a preview. Here you can set how the child gets displayed on its parent page in such a case.', 'sqppcptmeta' ) . '</p>';
		echo '		</td>';
		echo '	</tr>';

		echo '</table>';

	}

	public function save_metabox( $post_id, $post ) {

		// Add nonce for security and authentication.
		$nonce_name   = isset( $_POST['nonce'] ) ? $_POST['nonce'] : '';
		$nonce_action = '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.
		$new_sqpp_embedded_child_display_select = isset( $_POST[ 'sqpp_embedded_child_display_select' ] ) ? $_POST[ 'sqpp_embedded_child_display_select' ] : '';

		// Update the meta field in the database.
		update_post_meta( $post_id, 'sqpp_embedded_child_display_select', $new_sqpp_embedded_child_display_select );

	}

}

new sqpp_metabox_embedded_child_display;