diff --git a/app/controllers/attachments_controller.rb b/app/controllers/attachments_controller.rb
index 3c815c7d8..5385956c1 100644
--- a/app/controllers/attachments_controller.rb
+++ b/app/controllers/attachments_controller.rb
@@ -141,6 +141,23 @@ class AttachmentsController < ApplicationController
     end
   end
 
+  def update_file_dense
+    @attachment = Attachment.find(params[:attachmentid])
+    if  @attachment != nil
+      filedense = params[:newtype].to_s
+      if filedense == "1"
+        @attachment.is_public = 1
+      else
+        @attachment.is_public = 0
+      end
+      @attachment.save
+      @newfiledense = filedense
+    end
+    respond_to do |format|
+      format.js
+    end
+  end
+
   def thumbnail
     if @attachment.thumbnailable? && thumbnail = @attachment.thumbnail(:size => params[:size])
       if stale?(:etag => thumbnail)
diff --git a/app/views/attachments/update_file_dense.js.erb b/app/views/attachments/update_file_dense.js.erb
new file mode 100644
index 000000000..d99481d08
--- /dev/null
+++ b/app/views/attachments/update_file_dense.js.erb
@@ -0,0 +1,2 @@
+$("#is_public_<%= @attachment.id %>").html("<%= escape_javascript(link_to (@attachment.is_public? ? "公开":"私有"), update_file_dense_attachments_path(:attachmentid=>@attachment.id,:newtype=>(@attachment.is_public? ? 0:1)),
+                                                              :remote=>true,:class=>"f_l re_open",:method => :post) %>");
diff --git a/app/views/files/_course_file.html.erb b/app/views/files/_course_file.html.erb
index 603318cf6..089eee8ac 100644
--- a/app/views/files/_course_file.html.erb
+++ b/app/views/files/_course_file.html.erb
@@ -28,7 +28,10 @@
       <div class="re_con_box">
         <div class=" ">
           <%= link_to_attachment file, :download => true, :title => file.filename+"\n"+file.description.to_s, :style => "overflow: hidden; white-space: nowrap;text-overflow: ellipsis;",:class => "c_dblue f_14 f_b f_l" %>
-          <a href="#" class="f_l re_select">选入我的课程</a><a href="javascript:void(0)" class="f_l re_open">公开</a>
+          <a href="#" class="f_l re_select">选入我的课程</a>
+          <span id="is_public_<%= file.id %>">
+            <%= link_to (file.is_public? ? "公开":"私有"), update_file_dense_attachments_path(:attachmentid=>file.id,:newtype=>(file.is_public? ? 0:1)),:remote=>true,:class=>"f_l re_open",:method => :post  %>
+          </span>
         </div>
         <div class="cl"></div>
         <div class="">
diff --git a/config/routes.rb b/config/routes.rb
index 3e2abce47..510872316 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -563,6 +563,7 @@ RedmineApp::Application.routes.draw do
     collection do
       match "updateType" , :via =>  [:get, :post]
       match "updateFileDense" , :via =>  [:get, :post]
+      match "update_file_dense", :via => [:post]
       match "renderTag" , :via =>  [:get, :post]
       match 'delete_softapplications', :via =>  [:get, :post]
     end