ruby - rails的表单验证后格式错乱问题
天蓬老师
天蓬老师 2017-04-21 11:15:23
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举个例子,在表单中有这样的内容:

    <dl>                                                                                                                                                                                                                                                                        
      <dt>
        <%= f.label :subject %>
      </dt>
      <dd>
        <%= f.text_field :subject %>
      </dd>
    </dl>

在浏览器中显示成:

■Subject

(※注:■由CSS生成)

如果对表单进行验证,验证后再显示的格式就乱了,变成这样:

■
Subject

为什么会错位呢?

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天蓬老师

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Antworte allen(1)
Peter_Zhu

You should override ActionView::Base.field_error_proc. It's currently defined as this within ActionView::Base:

 @@field_error_proc = Proc.new{ |html_tag, instance| 
   "<p class=\"field_with_errors\">#{html_tag}</p>".html_safe
 }

You can override it by putting this in your application's class inside config/application.rb:

config.action_view.field_error_proc = Proc.new { |html_tag, instance| 
  "#{html_tag}".html_safe 
}

Restart rails server for this change to take effect.

(全文抄袭自 http://stackoverflow.com/questions/5267998/rails-3-field-with-errors-wrapper-changes-the-page-appearance-how-to-avoid-t)


当然,更推荐改成这样

config.action_view.field_error_proc = Proc.new do |html_tag, instance|
  class_attr_index = html_tag.index 'class='

  if class_attr_index
    html_tag.insert class_attr_index+7, 'error '
  else
    html_tag.insert html_tag.index('>'), ' class="error"'
  end
end
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