使用onchange函数进行动态选择,使用ajax调用jquery

时间:2012-12-12 07:28:23

标签: ruby-on-rails ruby jquery dynamic

PLease帮助,我用了一些例子来构建动态选择,但它似乎不起作用,不过在控制台我可以看到200状态,我不流利所以请请帮忙,问题是选择中的列表会不减少,选择previos后显示相同的选项

index.html.erb

  <%= collection_select(nil, :site_id,  @sites,  :id, :name, {:prompt   => "Select a Site"}, { :id => "sites_select"}) %>
                            <br/>
                    <%= collection_select(nil, :floor_id, @floors, :id, :name, {:prompt   => "Select a Floor"}, {:id => "floors_select"}) %>
                    <br/>
                    <%= collection_select(nil, :pod_id, @pods, :id, :name, {:prompt   => "Select a pod"}, {:id => "pods_select"}) %>
                    <script>
                          $(document).ready(function() {
                            $('#sites_select').change(function() {
                              $.ajax({
                                url: "<%= update_floors_path %>",
                                data: {
                                  site_id : $('#sites_select').val()
                                },
                                dataType: "script"
                              });
                            });
                            $('#floors_select').change(function() {
                              $.ajax({
                                url: "<%= update_pods_path %>",
                                data: {
                                  floor_id : $('#floors_select').val()
                                },
                                dataType: "script"
                              });
                            });
                          });
                        </script>

devices_controller.rb

  def update_floors
# updates floors and pods based on genre selected
site = Site.find(params[:site_id])
# map to name and id for use in our options_for_select
@floors = site.floors.map{|a| [a.name, a.id]}.insert(0, "Select a Floor")
@pods   = site.pods.map{|s| [s.name, s.id]}.insert(0, "Select a Pod")

end

def update_pods
# updates pods based on floor selected
floor = Floor.find(params[:floor_id])
@pods =floor.pods.map{|s| [s.name, s.id]}.insert(0, "Select a Pod")
end

update_floors.js.erb

$('#floors_select').html("<%= escape_javascript(options_for_select(@floors)) %>");
$('#pods_select').html("<%= escape_javascript(options_for_select(@pods)) %>");

update_pods.js.erb     $('#pods_select')。html(“&lt;%= escape_javascript(options_for_select(@pods))%&gt;”);

的routes.rb

  get 'devices/update_floors', :as => 'update_floors'
      get 'devices/update_pods', :as => 'update_pods'
      root :to => "devices#index"

感谢任何建议 谢谢, d

3 个答案:

答案 0 :(得分:1)

问题出在您的控制器上,

你还没有提到response_to js阻止代码中的任何位置,

只需将此代码放入两种更新方法中,

respond_to do |format|
 format.js
end 

答案 1 :(得分:1)

似乎新加载的JavaScript没有向父页面添加效果。为什么不在Ajax成功回调中使用$()。html。并使update.js.html页面仅包含select的选项。应该工作。

的javascript:

$("#sites_select").change(function(){
    $.ajax({
      url: your_url,
      //orther options ...
      success: function(data){
          $("#floors_select").html(data);
      }
    });

});

并在您的update_floors.js.html

<%=options_for_select(@floors)%>

对更新窗格执行相同操作。 :)

答案 2 :(得分:0)

在控制器respond_to :js, :only=>[:update_floors,:update_pods ]中给出响应格式 除此之外,将以下内容写入update_floors.js.erb文件。

$('#floors_select').html("<%= escape_javascript(collection_select(:your_object_name, :floor_id, @floors.to_a, :id, :name, :prompt=>"Select a Floor")) %>");
我认为上述情况会奏效。