Added FormHelper#label (closes #8641) [jcoglan]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@7541 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

actionpack/CHANGELOG

@@ -1,5 +1,7 @@
 *SVN*
 
+* Added FormHelper#label #8641 [jcoglan]
+
 * Added AtomFeedHelper (slightly improved from the atom_feed_helper plugin) [DHH]
 
 * Prevent errors when generating routes for uncountable resources, (i.e. sheep where plural == singluar).   map.resources :sheep now creates sheep_index_url for the collection and sheep_url for the specific item.  [Koz]

actionpack/lib/action_view/helpers/form_helper.rb

@@ -219,6 +219,25 @@ def fields_for(object_name, *args, &block)
         yield builder.new(object_name, object, self, options, block)
       end
 
+      # Returns a label tag tailored for labelling an input field for a specified attribute (identified by +method+) on an object
+      # assigned to the template (identified by +object+). The text of label will default to the attribute name unless you specify
+      # it explicitly. Additional options on the label tag can be passed as a hash with +options+. These options will be tagged
+      # onto the html as an HTML element attribute as in the example shown.
+      #
+      # ==== Examples
+      #   label(:post, :title)
+      #   #=> <label for="post_title">Title</label>
+      #
+      #   label(:post, :title, "A short title")
+      #   #=> <label for="post_title">A short title</label>
+      #
+      #   label(:post, :title, "A short title", :class => "title_label")
+      #   #=> <label for="post_title" class="title_label">A short title</label>
+      #
+      def label(object_name, method, text = nil, options = {})
+        InstanceTag.new(object_name, method, self, nil, options.delete(:object)).to_label_tag(text, options)
+      end
+
       # Returns an input tag of the "text" type tailored for accessing a specified attribute (identified by +method+) on an object
       # assigned to the template (identified by +object+). Additional options on the input tag can be passed as a
       # hash with +options+.  These options will be tagged onto the html as an HTML element attribute as in the example
@@ -398,6 +417,14 @@ def initialize(object_name, method_name, template_object, local_binding = nil, o
         end
       end
 
+      def to_label_tag(text = nil, options = {})
+        name_and_id = options.dup
+        add_default_name_and_id(name_and_id)
+        options["for"] = name_and_id["id"]
+        content = (text.blank? ? nil : text.to_s) || method_name.humanize
+        content_tag("label", content, options)
+      end
+
       def to_input_field_tag(field_type, options = {})
         options = options.stringify_keys
         options["size"] = options["maxlength"] || DEFAULT_FIELD_OPTIONS["size"] unless options.key?("size")
@@ -574,7 +601,7 @@ def initialize(object_name, object, template, options, proc)
         @object_name, @object, @template, @options, @proc = object_name, object, template, options, proc        
       end
       
-      (field_helpers - %w(check_box radio_button fields_for)).each do |selector|
+      (field_helpers - %w(label check_box radio_button fields_for)).each do |selector|
         src = <<-end_src
           def #{selector}(method, options = {})
             @template.send(#{selector.inspect}, @object_name, method, options.merge(:object => @object))
@@ -588,6 +615,10 @@ def fields_for(name, *args, &block)
         @template.fields_for(name, *args, &block)
       end
 
+      def label(method, text = nil, options = {})
+        @template.label(@object_name, method, text, options.merge(:object => @object))
+      end
+
       def check_box(method, options = {}, checked_value = "1", unchecked_value = "0")
         @template.check_box(@object_name, method, options.merge(:object => @object), checked_value, unchecked_value)
       end

actionpack/test/template/form_helper_test.rb

@@ -70,6 +70,19 @@ def url_for(options)
     @controller = @controller.new
   end
 
+  def test_label
+    assert_dom_equal('<label for="post_title">Title</label>', label("post", "title"))
+    assert_dom_equal('<label for="post_title">The title goes here</label>', label("post", "title", "The title goes here"))
+    assert_dom_equal(
+      '<label class="title_label" for="post_title">Title</label>',
+      label("post", "title", nil, :class => 'title_label')
+    )
+  end
+  
+  def test_label_with_symbols
+    assert_dom_equal('<label for="post_title">Title</label>', label(:post, :title))
+  end
+
   def test_text_field
     assert_dom_equal(
       '<input id="post_title" name="post[title]" size="30" type="text" value="Hello World" />', text_field("post", "title")
@@ -275,6 +288,7 @@ def test_form_for
     _erbout = ''
 
     form_for(:post, @post, :html => { :id => 'create-post' }) do |f|
+      _erbout.concat f.label(:title)
       _erbout.concat f.text_field(:title)
       _erbout.concat f.text_area(:body)
       _erbout.concat f.check_box(:secret)
@@ -283,6 +297,7 @@ def test_form_for
 
     expected = 
       "<form action='http://www.example.com' id='create-post' method='post'>" +
+      "<label for='post_title'>Title</label>" +
       "<input name='post[title]' size='30' type='text' id='post_title' value='Hello World' />" +
       "<textarea name='post[body]' id='post_body' rows='20' cols='40'>Back to the hill and over it again!</textarea>" +
       "<input name='post[secret]' checked='checked' type='checkbox' id='post_secret' value='1' />" +