Added access to nested attributes in RJS (closes #4548) [richcollins@gmail.com]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@5004 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

actionpack/CHANGELOG

@@ -1,5 +1,12 @@
 *SVN*
 
+* Added access to nested attributes in RJS #4548 [richcollins@gmail.com]. Examples:
+
+    page['foo']['style']                  # => $('foo').style;
+    page['foo']['style']['color']         # => $('blank_slate').style.color;
+    page['foo']['style']['color'] = 'red' # => $('blank_slate').style.color = 'red';
+    page['foo']['style'].color = 'red'    # => $('blank_slate').style.color = 'red';
+
 * Fixed that AssetTagHelper#image_tag and others using compute_public_path should not modify the incoming source argument (closes #5102) [eule@space.ch]
 
 * Deprecated the auto-appending of .png to AssetTagHelper#image_tag calls that doesn't have an extension [DHH] 

actionpack/lib/action_view/helpers/prototype_helper.rb

@@ -777,6 +777,21 @@ module ActionView
         super(generator, "$(#{id.to_json})")
       end
       
+      # Allows access of element attributes through +attribute+. Examples:
+      #
+      #   page['foo']['style']                  # => $('foo').style;
+      #   page['foo']['style']['color']         # => $('blank_slate').style.color;
+      #   page['foo']['style']['color'] = 'red' # => $('blank_slate').style.color = 'red';
+      #   page['foo']['style'].color = 'red'    # => $('blank_slate').style.color = 'red';
+      def [](attribute)
+        append_to_function_chain!(attribute)
+        self
+      end
+      
+      def []=(variable, value)
+        assign(variable, value)
+      end
+      
       def replace_html(*options_for_render)
         call 'update', @generator.send(:render, *options_for_render)
       end

actionpack/test/template/prototype_helper_test.rb

@@ -262,6 +262,16 @@ Element.update("baz", "<p>This is a test</p>");
     @generator['hello'].hide
     assert_equal %($("hello").hide();), @generator.to_s
   end
+  
+  def test_element_proxy_variable_access
+    @generator['hello']['style']
+    assert_equal %($("hello").style;), @generator.to_s
+  end
+  
+  def test_element_proxy_variable_access_with_assignment
+    @generator['hello']['style']['color'] = 'red'
+    assert_equal %($("hello").style.color = "red";), @generator.to_s
+  end
 
   def test_element_proxy_assignment
     @generator['hello'].width = 400