jquery append在Rails ajax视图中不起作用

我的应用程序在Rails 4.1.1和jquery上

该页面显示一个活动列表，每个活动包含在一个分部中

对于每个活动，用户都可以添加一条新的注释-链接到新注释方法的id是基于活动id动态生成的，即newcomment_185

对于每个活动，注释显示在一个列表中。ul的id基于活动id动态显示，即commentslist_185

_activity.html.erb (my activity partial)
<p>The activity content is here.
<%= link_to t('new_comment'), new_activity_comment_path(activity_id: activity.id), :id => "newcomment_#{activity.id}", remote: true, :class => "button tiny " %></p>
<ul id="commentslist_<%= activity.id %> "> Comments: <%= activity.comments.count %>
 <% activity.comments.each do |comment| %>
    <li> <%= comment.body %> (par <%= comment.commenter.name %>) </li> 
<% end %>
</ul>

comments_controller.erb
class CommentsController < ApplicationController
load_and_authorize_resource

  def new
    @comment = Comment.new commenter: current_user, activity_id: params[:activity_id]
    respond_to do |format|
      if request.xhr?
        format.js
        format.html { render layout: false }
      else
        format.js { render :action => 'new' }
        format.html { render 'new' }
        format.json { render json: @comment }
      end
    end
  end

  def create
    @comment = Comment.new(comment_params)
    @comment.commenter = current_user
    respond_to do |format|
      if @comment.save
        format.js
        format.html { redirect_to root_path, notice: 'Commentaire ajouté' }
      else
        format.js { render 'update' }
        format.html { render 'new' }
        format.json { render json: @comment.errors, status: :unprocessable_entity }
      end
    end
  end

  private

  def comment_params
    params.require(:comment).permit(:body, :activity_id, :commenter_id)
  end
end

/app/views/comments/new.js.erb
$('#newcomment_<%= @comment.activity_id.to_s %>').hide().after('<%= j render("form") %>');
$('#commentform').slideDown(350);

/app/views/comments/create.js.erb
$('#commentform_<%= @comment.activity_id.to_s %>').remove();
$('#newcomment_<%= @comment.activity_id.to_s %>').show();
$('#commentslist_<%= @comment.activity_id.to_s %> ul').append('<%= j render(@comment) %>');

问题是这最后一行，除了这一行，一切都正常。li元素未添加到ul中

在Chrome控制台预览中，已解析的js似乎正常：

$('#commentform_188').remove();
$('#newcomment_188').show();
$('#commentslist_188 ul').append('<li> test 1 (by John Doe) <\/li>');

---

任何地方都没有错误消息。我尝试了最后一行的不同版本，没有ul，交替单引号和双引号，等等。我不知道。感谢您的指点。

我认为您添加了一个额外的空格，使选择器中断：

<="commentslist_<%= activity.id %> ">
<="commentslist_<%= activity.id %>">

---

我没有意识到名称后面的额外空格会破坏选择器。抢手货谢谢