data-remote needs to be on the form and not the submit when using button_to :remote=>true

actionpack/lib/action_view/helpers/url_helper.rb

@@ -286,6 +286,8 @@ module ActionView
 
         form_method = method.to_s == 'get' ? 'get' : 'post'
 
+        remote = html_options.delete('remote')
+
         request_token_tag = ''
         if form_method == 'post' && protect_against_forgery?
           request_token_tag = tag(:input, :type => "hidden", :name => request_forgery_protection_token.to_s, :value => form_authenticity_token)
@@ -298,7 +300,7 @@ module ActionView
 
         html_options.merge!("type" => "submit", "value" => name)
 
-        ("<form method=\"#{form_method}\" action=\"#{escape_once url}\" class=\"button-to\"><div>" +
+        ("<form method=\"#{form_method}\" action=\"#{escape_once url}\" #{"data-remote=\"true\"" if remote} class=\"button-to\"><div>" +
           method_tag + tag("input", html_options) + request_token_tag + "</div></form>").html_safe!
       end
 

actionpack/test/template/url_helper_test.rb

@@ -81,6 +81,13 @@ class UrlHelperTest < ActionView::TestCase
     )
   end
 
+  def test_button_to_with_remote_and_javascript_confirm
+    assert_dom_equal(
+      "<form method=\"post\" action=\"http://www.example.com\" class=\"button-to\" data-remote=\"true\"><div><input data-confirm=\"Are you sure?\" type=\"submit\" value=\"Hello\" /></div></form>",
+      button_to("Hello", "http://www.example.com", :remote => true, :confirm => "Are you sure?")
+    )
+  end
+
   def test_button_to_enabled_disabled
     assert_dom_equal(
       "<form method=\"post\" action=\"http://www.example.com\" class=\"button-to\"><div><input type=\"submit\" value=\"Hello\" /></div></form>",