如何将一个按钮添加到部分关闭部分？

I have this partial

我有这个偏袒

_reply.haml

.reply-form
    = form_for comment, :remote => true do |f|
        = f.text_area :body, :input_html => { :rows => "2" }, :label => false
        = f.text_field :commentable_id, :as => :hidden, :value => comment.commentable_id
        = f.text_field :commentable_type, :as => :hidden, :value => comment.commentable_type
        = f.text_field :p_comment, :as => :hidden, :value => parent_comment.id
        = f.submit "Reply!", :class => "btn btn-primary", :disable_with => "Submitting…"
.r