Drupal 8在ajax回调后添加ajax表单元素

function mymodule_form_alter(&$form, &$form_state, $form_id) {
  if ($form_id == 'my_form_id') {
    $form['my_element'] = [
      '#type' => 'textfield',
      '#title' => 'My Element',
      '#ajax' => [
        'callback' => 'mymodule_ajax_callback',
        'wrapper' => 'my-element-wrapper',
        'effect' => 'fade',
      ],
    ];
    
    $form['my_element_wrapper'] = [
      '#type' => 'container',
      '#attributes' => [
        'id' => 'my-element-wrapper',
      ],
    ];
  }
}

function mymodule_ajax_callback($form, &$form_state) {
  return $form['my_element_wrapper'];
}

mylibrary:
  version: 1.x
  js:
    js/my_script.js: {}
  css:
    theme:
      css/my_styles.css: {}

(function ($) {
  Drupal.behaviors.myBehavior = {
    attach: function (context, settings) {
      $('#my-element-wrapper', context).once('myBehavior').ajaxComplete(function () {
        // 在AJAX请求完成后执行的代码
      });
    }
  };
})(jQuery);