Fix render :text no longer working, and show a reminder message when no page is found

app/controllers/admin/event_news_controller.rb

@@ -84,7 +84,7 @@ class Admin::EventNewsController < OrbitAdminController
     uids = iframe_params['member_ids'].to_a.map{|m_id| MemberProfile.find(m_id).uid rescue nil}.select{|uid| !uid.nil?}
     url_params = iframe_params.except(:member_ids)
     url_params['uids'] = uids if uids != []
-    render :text => '/xhr/panel/event_news/widget/sync_data?'+url_params.to_param
+    render :plain => '/xhr/panel/event_news/widget/sync_data?'+url_params.to_param
   end
   def settings
     @setting = @event_news_setting
@@ -488,7 +488,12 @@ class Admin::EventNewsController < OrbitAdminController
     
     event_news.is_preview = true
     event_news.save
-    render :text=>page_for_event_news(event_news) + "?preview=true"
+    preview_url = page_for_event_news(event_news)
+    if preview_url == "/"
+      render :json => { "error" => true, "message" => t("event_news.no_event_news_page") }
+    else
+      render :plain=>preview_url + "?preview=true"   
+    end
   end
 
   def destroy_preview

app/views/admin/event_news/_form.html.erb

@@ -712,6 +712,10 @@
         processData: false,
         contentType: false
       }).done(function(data){
+        if(typeof data === "object" && data.error){
+          alert(data.message);
+          return;
+        }
         if(window.location.protocol === "https:"){
           data = data.replace("http:","https:");
         }

config/locales/en.yml

@@ -4,6 +4,7 @@ en:
   event_news_mod:
     event_news_mod: Event News
   event_news:
+    no_event_news_page: "No event news page has been set. Please set one first."
     carousel_image_types:
       default: Default
       carousel: Carousel

config/locales/zh_tw.yml

@@ -4,6 +4,7 @@ zh_tw:
   event_news_mod:
     event_news_mod: 活動公告
   event_news:
+    no_event_news_page: "沒有任何活動公告頁面，請先設定一個"
     carousel_image_types:
       default: 預設
       carousel: 輪播