Sakurairo/opt/fields/textarea/textarea.php

<?php if ( ! defined( 'ABSPATH' ) ) { die; } // Cannot access directly.
/**
 *
 * Field: textarea
 *
 * @since 1.0.0
 * @version 1.0.0
 *
 */
if ( ! class_exists( 'CSF_Field_textarea' ) ) {
  class CSF_Field_textarea extends CSF_Fields {

    public function __construct( $field, $value = '', $unique = '', $where = '', $parent = '' ) {
      parent::__construct( $field, $value, $unique, $where, $parent );
    }

    public function render() {

      echo $this->field_before();
      echo $this->shortcoder();
      echo '<textarea name="'. esc_attr( $this->field_name() ) .'"'. $this->field_attributes() .'>'. $this->value .'</textarea>';
      echo $this->field_after();

    }

    public function shortcoder() {

      if ( ! empty( $this->field['shortcoder'] ) ) {

        $instances = ( is_array( $this->field['shortcoder'] ) ) ? $this->field['shortcoder'] : array_filter( (array) $this->field['shortcoder'] );

        foreach ( $instances as $instance_key ) {

          if ( isset( Sakurairo_CSF::$shortcode_instances[$instance_key] ) ) {

            $button_title = Sakurairo_CSF::$shortcode_instances[$instance_key]['button_title'];

            echo '<a href="#" class="button button-primary csf-shortcode-button" data-modal-id="'. esc_attr( $instance_key ) .'">'. $button_title .'</a>';

          }

        }

      }

    }
  }
}