html在link_to中被转义。

Question

我正在尝试实现一个链接，当单击时会将您标记为出席会议。此链接是帮助器中的方法：

  def link_to_remote_registration(event_id)
    down_image = "down_blanco.png"
    up_image   = "up_blanco.png"

    unless registration.nil?
      if registration.present == 1
        up_image = "up_filled.png"
      elsif registration.present == 0
        down_image = "down_filled.png"
      end
    end

    link_to_remote_registration = String.new 
    loading_and_complete = "Element.show('indicator_event_"+event_id.to_s+"'); Element.hide('vote_"+event_id.to_s+"')".html_safe
    complete = "Element.hide('indicator_event_"+event_id.to_s+"'); Element.show('vote_"+event_id.to_s+"')".html_safe

    link_to_remote_registration =
      link_to(image_tag(up_image , :id =>  'will_not_attend_event_'+ event_id.to_s , border => 0),
      :url =>  new_registration_path(:present  => 1, :event_id => event_id, :escape => false),
      :remote => true,
      :method => :put,
      :loading => loading_and_complete,
      :complete => complete)

    return link_to_remote_registration
  end

问题是，当我在我的视图中呈现链接时，一些html会逃脱，从而使链接无法工作。

<a href="/calendar?complete=Element.hide%28%27indicator_event_1%27%29%3B+Element.show%28%27vote_1%27%29&loading=Element.show%28%27indicator_event_1%27%29%3B+Element.hide%28%27vote_1%27%29&method=put&remote=true&url=%2Fregistrations%2Fnew%3Fevent_id%3D1%26present%3D1">
<img id="will_not_attend_event_1" border="0" src="/images/up_blanco.png?1198181114" alt="Up_blanco">
</a>

我认为这不是一个有效的url。我想知道为什么会发生这种情况-我在完整和加载字符串上调用html转义。

问候

Answer 1

由于您是从helper传递的html，因此Rails会对其进行清理以防止XSS。您可以通过返回以下内容来覆盖它：

link_to_remote_registration.html_safe

http://railscasts.com/episodes/204-xss-protection-in-rails-3

Answer 2

您还可以使用raw()，而不是在系统范围内禁用XSS。

raw(image_tag(up_image , :id =>  'will_not_attend_event_'+ event_id.to_s , border => 0))