2 files changed, 16 insertions, 3 deletions
diff --git a/actionpack/lib/action_view/render/layouts.rb b/actionpack/lib/action_view/render/layouts.rb
index 0cb688ca77..b4720aa681 100644
--- a/actionpack/lib/action_view/render/layouts.rb
+++ b/actionpack/lib/action_view/render/layouts.rb
@@ -43,10 +43,16 @@ module ActionView
     # This is the method which actually finds the layout using details in the lookup
     # context object. If no layout is found, it checkes if at least a layout with
     # the given name exists across all details before raising the error.
-    def find_layout(layout) #:nodoc:
+    #
+    # If self.formats contains several formats, just the first one is considered in
+    # the layout lookup.
+    def find_layout(layout)
       begin
-        layout =~ /^\// ?
-          with_fallbacks { find_template(layout) } : find_template(layout)
+        if formats.size == 1
+          _find_layout(layout)
+        else
+          update_details(:formats => self.formats[0,1]){ _find_layout(layout) }
+        end
       rescue ActionView::MissingTemplate => e
         update_details(:formats => nil) do
           raise unless template_exists?(layout)
@@ -54,6 +60,11 @@ module ActionView
       end
     end
 
+    def _find_layout(layout) #:nodoc:
+      layout =~ /^\// ?
+        with_fallbacks { find_template(layout) } : find_template(layout)
+    end
+
     # Contains the logic that actually renders the layout.
     def _render_layout(layout, locals, &block) #:nodoc:
       layout.render(self, locals){ |*name| _layout_for(*name, &block) }
diff --git a/actionpack/lib/action_view/template.rb b/actionpack/lib/action_view/template.rb
index b4fdb49d3b..15fafac53d 100644
--- a/actionpack/lib/action_view/template.rb
+++ b/actionpack/lib/action_view/template.rb
@@ -31,7 +31,9 @@ module ActionView
       format    = details[:format]
       format  ||= handler.default_format.to_sym if handler.respond_to?(:default_format)
       format  ||= :html
+
       @formats  = [format.to_sym]
+      @formats << :html if @formats.first == :js
     end
 
     def render(view, locals, &block)