discography.php

<?php
/**
 * Example: Add discography example
 */
if ( ! function_exists( 'cmb2_example_plugin_post_discography' ) ) {
	function cmb2_example_plugin_post_discography() {

		$prefix = '_cmb2_example_post_discography_';

		/**
		 * Initiate the metabox
		 */
		$cmb = new_cmb2_box( array(
			'id'           => $prefix,
			'title'        => __( 'Discography', 'cmb2' ),
			'object_types' => array( 'post', ), // Post type
			'context'      => 'normal',
			'priority'     => 'high',
			'show_names'   => true, // Show field names on the left
			// 'cmb_styles' => false, // false to disable the CMB stylesheet
			// 'closed'     => true, // Keep the metabox closed by default
		) );

		// Regular text field
		/*$cmb->add_field( array(
			'name'       => __( 'Album year', 'cmb2' ),
			// 'desc'       => __( 'field description (optional)', 'cmb2' ),
			'id'         => $prefix . 'year',
			'type'       => 'text',
			// 'show_on_cb' => 'cmb2_hide_if_no_cats', // function should return a bool value
			// 'sanitization_cb' => 'my_custom_sanitization', // custom sanitization callback parameter
			// 'escape_cb'       => 'my_custom_escaping',  // custom escaping callback parameter
			// 'on_front'        => false, // Optionally designate a field to wp-admin only
			// 'repeatable'      => true,
		) );*/

		$group_field_id = $cmb->add_field( array(
			'name'        => 'Albums',
			'id'          => $prefix . 'albums',
			'type'        => 'group',
			'description' => __( 'List of albums', 'cmb' ),
			'options'     => array(
				'group_title'   => __( 'Album {#}', 'cmb' ), // since version 1.1.4, {#} gets replaced by row number
				'add_button'    => __( 'Add Another Album', 'cmb' ),
				'remove_button' => __( 'Remove Album', 'cmb' ),
				'sortable'      => true, // beta
			),
		) );

		$cmb->add_group_field( $group_field_id, array(
			'name' => 'Album Title',
			'id'   => 'title',
			'type' => 'text',
		) );

		$cmb->add_group_field( $group_field_id, array(
			'name' => 'Album Year',
			'id'   => 'year',
			'type' => 'text_small',
		) );

		$tracks_group_field_id = $cmb->add_group_field( $group_field_id, array(
			'name'        => 'Tracks',
			'id'          => 'tracks',
			'type'        => 'group',
			'description' => __( 'List of tracks', 'cmb' ),
			'options'     => array(
				'group_title'   => __( 'Track {#}', 'cmb' ), // since version 1.1.4, {#} gets replaced by row number
				'add_button'    => __( 'Add Another Track', 'cmb' ),
				'remove_button' => __( 'Remove Track', 'cmb' ),
				'sortable'      => true, // beta
			),
		) );

		$tracks_group_field_id = $tracks_group_field_id[1]; // Get field ID

		$cmb->add_group_field( $tracks_group_field_id, array(
			'name' => 'Track Title',
			'id'   => 'title',
			'type' => 'text',
		) );

		$cmb->add_group_field( $tracks_group_field_id, array(
			'name' => 'Track Length',
			'id'   => 'length',
			'type' => 'text_small',
		) );

		$cmb->add_group_field( $tracks_group_field_id, array(
			'name'       => 'Composer',
			'id'         => 'title',
			'type'       => 'text',
			'repeatable' => true,
		) );

		$buy_now_group_field_id = $cmb->add_group_field( $tracks_group_field_id, array(
			'name'        => 'Buy Now Links',
			'id'          => 'buy_now_links',
			'type'        => 'group',
			'description' => __( 'List of stores', 'cmb' ),
			'options'     => array(
				'group_title'   => __( 'Store {#}', 'cmb' ), // since version 1.1.4, {#} gets replaced by row number
				'add_button'    => __( 'Add Another Store', 'cmb' ),
				'remove_button' => __( 'Remove Store', 'cmb' ),
				'sortable'      => true, // beta
			),
		) );

		$buy_now_group_field_id = $buy_now_group_field_id[1]; // Get field ID

		$cmb->add_group_field( $buy_now_group_field_id, array(
			'name' => 'Store Name',
			'id'   => 'length',
			'type' => 'text',
		) );

		$cmb->add_group_field( $buy_now_group_field_id, array(
			'name' => 'Link',
			'id'   => 'length',
			'type' => 'text',
		) );

		$singles_group_field_id = $cmb->add_field( array(
			'name'        => 'Singles',
			'id'          => $prefix . 'singles',
			'type'        => 'group',
			'description' => __( 'List of singles', 'cmb' ),
			'options'     => array(
				'group_title'   => __( 'Single {#}', 'cmb' ), // since version 1.1.4, {#} gets replaced by row number
				'add_button'    => __( 'Add Another Single', 'cmb' ),
				'remove_button' => __( 'Remove Single', 'cmb' ),
				'sortable'      => true, // beta
			),
		) );

		$cmb->add_group_field( $singles_group_field_id, array(
			'name' => 'Single Title',
			'id'   => 'title',
			'type' => 'text',
		) );

		$cmb->add_group_field( $singles_group_field_id, array(
			'name' => 'Single Length',
			'id'   => 'length',
			'type' => 'text_small',
		) );

		$cmb->add_group_field( $singles_group_field_id, array(
			'name'       => 'Composer',
			'id'         => 'title',
			'type'       => 'text',
			'repeatable' => true,
		) );

		$buy_now_single_group_field_id = $cmb->add_group_field( $singles_group_field_id, array(
			'name'        => 'Buy Now Links',
			'id'          => 'buy_now_links',
			'type'        => 'group',
			'description' => __( 'List of stores', 'cmb' ),
			'options'     => array(
				'group_title'   => __( 'Store {#}', 'cmb' ), // since version 1.1.4, {#} gets replaced by row number
				'add_button'    => __( 'Add Another Store', 'cmb' ),
				'remove_button' => __( 'Remove Store', 'cmb' ),
				'sortable'      => true, // beta
			),
		) );

		$buy_now_single_group_field_id = $buy_now_single_group_field_id[1]; // Get field ID

		$cmb->add_group_field( $buy_now_single_group_field_id, array(
			'name' => 'Store Name',
			'id'   => 'length',
			'type' => 'text',
		) );

		$cmb->add_group_field( $buy_now_single_group_field_id, array(
			'name' => 'Link',
			'id'   => 'length',
			'type' => 'text',
		) );

	}
}
add_filter( 'cmb2_init', 'cmb2_example_plugin_post_discography' );