From 0cb18335d9108c0c2d7796257446ad3741661939 Mon Sep 17 00:00:00 2001
From: David Heinemeier Hansson <david@loudthinking.com>
Date: Mon, 21 Mar 2005 23:41:25 +0000
Subject: [PATCH] fix for javascript_helper.rb build_callbacks #893

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@970 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
---
 actionpack/lib/action_view/helpers/javascript_helper.rb | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/actionpack/lib/action_view/helpers/javascript_helper.rb b/actionpack/lib/action_view/helpers/javascript_helper.rb
index 569f3ff194..3de110428f 100644
--- a/actionpack/lib/action_view/helpers/javascript_helper.rb
+++ b/actionpack/lib/action_view/helpers/javascript_helper.rb
@@ -169,9 +169,11 @@ module ActionView
             
       def build_callbacks(options)
         CALLBACKS.inject({}) do |callbacks, callback|
-          name = 'on' + callback.to_s.capitalize
-          code = escape_javascript(options[callback])
-          callbacks[name] = "function(request){#{code}}" if callbacks[name]
+          if options[callback]
+            name = 'on' + callback.to_s.capitalize
+            code = escape_javascript(options[callback])
+            callbacks[name] = "function(request){#{code}}"
+          end
           callbacks
         end
       end