drupal-8 - hook_form_user_register_form_alter（更改添加的字段）

Question

以下内容无效：（#description 和 #attributes 有效。#required 无效）

function bncreports_form_user_register_form_alter(&$form, FormStateInterface $form_state, $form_id)
{
  $form['account']['mail']['#attributes'] = ['onblur' => "getElementById('edit-name').value=this.value.toLowerCase();"];
  $form['account']['name']['#description'] = 'Use Email address as your username';
  $form['account']['name']['#attributes'] = ['onblur' => 'this.value=this.value.toLowerCase();'];
  $form['field_district']['widget']['#required'] = true;
}

为什么不？

标签： drupal-8