使用RJS / AJAX更新多个div

时间:2010-05-21 02:36:58

标签: ruby-on-rails ruby ajax rjs

我成功使用RJS在page.replace.html create.js.rjs上实现AJAX。我正在尝试更新两个位置而不是一个,并且在观看Ryan Bates Railscast之后我非常接近(我认为)但是我的/views/likes/create.js.rjs文件的语法有问题。情况如下:

位于/views/likes/create.js.rjs的

是以下代码:

page.replace_html  "votes_#{ @site.id }", :partial => @like
page.replace_html  "counter", 10 - (@question.likes.count :conditions => {:user_id => current_user.id})
page[@like].visual_effect :highlight

我的问题在于第二行。 div“counter”在/views/question/show.html.erb页面中显示以下代码:

    <div id="counter">
        You have <%= 10 - (@question.likes.count :conditions => {:user_id => current_user.id}) %> votes remaining for this question
    </div>

从观看屏幕投射后,我相信我的错误必须与第二行的语法有关。具体来说,他提到你不能使用本地实例变量,但不知道如何进行更改。想法?

更新:这是我得到的错误:

ActionView::TemplateError (undefined method `likes' for nil:NilClass) on line #2 of app/views/likes/create.js.rjs:
1: page.replace_html  "votes_#{ @site.id }", :partial => @like
2: page.replace_html  "counter", 10 - (@question.likes.count :conditions => {:user_id => current_user.id})
3: page[@like].visual_effect :highlight

    app/views/likes/create.js.rjs:2:in `_run_rjs_app47views47likes47create46js46rjs'
    app/views/likes/create.js.rjs:1:in `_run_rjs_app47views47likes47create46js46rjs'
    app/controllers/likes_controller.rb:8:in `create'

Rendered rescues/_trace (103.8ms)
Rendered rescues/_request_and_response (0.4ms)
Rendering rescues/layout (internal_server_error)

更新:

class LikesController&lt; ApplicationController中

  def create
    @user = current_user
    @site = Site.find(params[:site_id])
    @like = @site.likes.create!(params[:like].merge(:user_id => @user.id))

    respond_to do |format|
     format.html { redirect_to @site}
     format.js
     end
  end
end

更新:这是喜欢的形式:

    <% remote_form_for [site, Like.new] do |f| %>
    <%= f.hidden_field :site_name, :value => "#{site.name}" %>
    <%= f.hidden_field :question_id, :value => @question.id %> 
    <%= f.hidden_field :ip_address, :value => "#{request.remote_ip}" %>
    <%= f.hidden_field :like, :value => "1" %>
    <%= submit_tag "^" , :class => 'voteup' %>
<% end %>

3 个答案:

答案 0 :(得分:2)

尝试像这样获取@question,因为你的question_id将出现在params [:like] hash

 @question = Question.find params[:like][:question_id]

无论如何要进行双重检查,请打印你的params,这样就可以在likes_controller的create action中添加一个puts语句。

puts params.inspect,params[:like][:question_id]

第2行你有这个错误(未定义的方法`喜欢'为nil:NilClass)

这意味着您的@question为零,您从未在创建操作中声明此实例。

希望这适合你。

答案 1 :(得分:0)

你得到@question = nil。你应该检查@question是nil还是@ question.likes.count = 0如果是这样你应该做(10-0)即

if //your condition here 
  page.replace_html  "counter", "You have 10 votes remaining for this question"
else 
  page.replace_html  "counter", 10 - (@question.likes.count :conditions => {:user_id => current_user.id})

OR

remaining_votes= (@question && !@question.likes.blank && @question.likes.count :conditions => {:user_id => current_user.id} !=0 )? @question.likes.count :conditions => {:user_id => current_user.id} : 0
page.replace_html  "counter", "You have #{10-remaining_votes } votes remaining for this question"

答案 2 :(得分:0)

在控制器中,您需要加载@question变量。