Added button_to_remote helper

Ticket originally from http://dev.rubyonrails.org/ticket/3641

Signed-off-by: Jeremy Kemper <jeremy@bitsweat.net>

actionpack/CHANGELOG

@@ -1,5 +1,7 @@
 *Edge*
 
+* Added button_to_remote helper.  #3641 [Donald Piret, Tarmo Tänav]
+
 * Deprecate render_component. Please use render_component plugin from http://github.com/rails/render_component/tree/master [Pratik]
 
 * Routes may be restricted to lists of HTTP methods instead of a single method or :any.  #407 [Brennan Dunn, Gaius Centus Novus]

actionpack/lib/action_view/helpers/prototype_helper.rb

@@ -255,6 +255,14 @@ def link_to_remote(name, options = {}, html_options = nil)
         link_to_function(name, remote_function(options), html_options || options.delete(:html))
       end
 
+      # Creates a button with an onclick event which calls a remote action
+      # via XMLHttpRequest
+      # The options for specifying the target with :url
+      # and defining callbacks is the same as link_to_remote.
+      def button_to_remote(name, options = {}, html_options = {})
+        button_to_function(name, remote_function(options), html_options)
+      end
+
       # Periodically calls the specified url (<tt>options[:url]</tt>) every
       # <tt>options[:frequency]</tt> seconds (default is 10). Usually used to
       # update a specified div (<tt>options[:update]</tt>) with the results

actionpack/test/template/prototype_helper_test.rb

@@ -91,6 +91,19 @@ def test_link_to_remote_url_quote_escaping
       link_to_remote("Remote", { :url => { :action => "whatnot's" } })
   end
 
+  def test_button_to_remote
+    assert_dom_equal %(<input class=\"fine\" type=\"button\" value=\"Remote outpost\" onclick=\"new Ajax.Request('http://www.example.com/whatnot', {asynchronous:true, evalScripts:true});\" />),
+      button_to_remote("Remote outpost", { :url => { :action => "whatnot"  }}, { :class => "fine"  })
+    assert_dom_equal %(<input type=\"button\" value=\"Remote outpost\" onclick=\"new Ajax.Request('http://www.example.com/whatnot', {asynchronous:true, evalScripts:true, onComplete:function(request){alert(request.reponseText)}});\" />),
+      button_to_remote("Remote outpost", :complete => "alert(request.reponseText)", :url => { :action => "whatnot"  })
+    assert_dom_equal %(<input type=\"button\" value=\"Remote outpost\" onclick=\"new Ajax.Request('http://www.example.com/whatnot', {asynchronous:true, evalScripts:true, onSuccess:function(request){alert(request.reponseText)}});\" />),
+      button_to_remote("Remote outpost", :success => "alert(request.reponseText)", :url => { :action => "whatnot"  })
+    assert_dom_equal %(<input type=\"button\" value=\"Remote outpost\" onclick=\"new Ajax.Request('http://www.example.com/whatnot', {asynchronous:true, evalScripts:true, onFailure:function(request){alert(request.reponseText)}});\" />),
+      button_to_remote("Remote outpost", :failure => "alert(request.reponseText)", :url => { :action => "whatnot"  })
+    assert_dom_equal %(<input type=\"button\" value=\"Remote outpost\" onclick=\"new Ajax.Request('http://www.example.com/whatnot?a=10&amp;b=20', {asynchronous:true, evalScripts:true, onFailure:function(request){alert(request.reponseText)}});\" />),
+      button_to_remote("Remote outpost", :failure => "alert(request.reponseText)", :url => { :action => "whatnot", :a => '10', :b => '20' })
+  end
+
   def test_periodically_call_remote
     assert_dom_equal %(<script type="text/javascript">\n//<![CDATA[\nnew PeriodicalExecuter(function() {new Ajax.Updater('schremser_bier', 'http://www.example.com/mehr_bier', {asynchronous:true, evalScripts:true})}, 10)\n//]]>\n</script>),
       periodically_call_remote(:update => "schremser_bier", :url => { :action => "mehr_bier" })