#1026 上传出现网络问题时给出提示

app/views/files/_course_new.html.erb

@@ -1,6 +1,7 @@
 <h3><%=l(:label_attachment_new)%></h3>
 <% attachmenttypes = course.attachmenttypes %>
 <%= error_messages_for 'attachment' %>
+<div id="network_issue" style="color: red; display: none;">上传出现错误，请您检查您的网络环境，并刷新页面重新上传。</div>
 <%= form_tag(course_files_path(course), :multipart => true,:remote => true,:method => :post,:name=>"upload_form", :class => "tabular") do %>
 <div class="box">
   <p>

public/javascripts/attachments.js

@@ -69,6 +69,10 @@ function ajaxUpload(file, attachmentId, fileSpan, inputEl) {
       })
       .fail(function(result) {
         progressSpan.text(result.statusText);
+        if($("#network_issue"))
+        {
+            $("#network_issue").show();  
+        }
       }).always(function() {
         ajaxUpload.uploading--;
         fileSpan.removeClass('ajax-loading');