Tax Meta

class staff_department_metafields {

	public function __construct() {

		if ( is_admin() ) {

			add_action( 'staff_add_form_fields',  array( $this, 'create_screen_fields'), 10, 1 );
			add_action( 'staff_edit_form_fields', array( $this, 'edit_screen_fields' ),  10, 2 );

			add_action( 'created_staff', array( $this, 'save_data' ), 10, 1 );
			add_action( 'edited_staff',  array( $this, 'save_data' ), 10, 1 );

		}

	}

	public function create_screen_fields( $taxonomy ) {

		// Set default values.
		$staff_department_order = '';

		// Form fields.
		echo '<div class="form-field term-staff_department_order-wrap">';
		echo '	<label for="staff_department_order">' . __( 'Abteilungen nach Wichtigkeit geordnet (hohe Werte für höchste Abteilungen)', 'ap_theme' ) . '</label>';
		echo '	<input type="text" id="staff_department_order" name="staff_department_order" placeholder="' . esc_attr__( '', 'ap_theme' ) . '" value="' . esc_attr( $staff_department_order ) . '">';
		echo '	<p class="description">' . __( 'Die Gewichtung dieser Abteilung eingeben (hohe Werte für höchste Abteilungen)', 'ap_theme' ) . '</p>';
		echo '</div>';

	}

	public function edit_screen_fields( $term, $taxonomy ) {

		// Retrieve an existing value from the database.
		$staff_department_order = get_term_meta( $term->term_id, 'staff_department_order', true );

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

		// Form fields.
		echo '<tr class="form-field term-staff_department_order-wrap">';
		echo '<th scope="row">';
		echo '	<label for="staff_department_order">' . __( 'Abteilungen nach Wichtigkeit geordnet (hohe Werte für höchste Abteilungen)', 'ap_theme' ) . '</label>';
		echo '</th>';
		echo '<td>';
		echo '	<input type="text" id="staff_department_order" name="staff_department_order" placeholder="' . esc_attr__( '', 'ap_theme' ) . '" value="' . esc_attr( $staff_department_order ) . '">';
		echo '	<p class="description">' . __( 'Die Gewichtung dieser Abteilung eingeben (hohe Werte für höchste Abteilungen)', 'ap_theme' ) . '</p>';
		echo '</td>';
		echo '</tr>';

	}

	public function save_data( $term_id ) {

		// Sanitize user input.
		$staff_new_department_order = isset( $_POST[ 'staff_department_order' ] ) ? sanitize_text_field( $_POST[ 'staff_department_order' ] ) : '';

		// Update the meta field in the database.
		update_term_meta( $term_id, 'staff_department_order', $staff_new_department_order );

	}

}

new staff_department_metafields;