Added additional documentation to FormTagHelper #1788 [jon@instance-design.co.uk]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@1880 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

actionpack/lib/action_view/helpers/form_tag_helper.rb

@@ -14,6 +14,7 @@ module FormTagHelper
       #
       # Options:
       # * <tt>:multipart</tt> - If set to true, the enctype is set to "multipart/form-data".
+      # * <tt>:method</tt> - The method to use when submitting the form, usually either "get" or "post".
       def form_tag(url_for_options = {}, options = {}, *parameters_for_url)
         html_options = { "method" => "post" }.merge(options.stringify_keys)
 
@@ -33,26 +34,68 @@ def end_form_tag
         "</form>"
       end
 
+      # Creates a dropdown selection box, or if the <tt>:multiple</tt> option is set to true, a multiple
+      # choice selection box.
+      #
+      # Helpers::FormOptions can be used to create common select boxes such as countries, time zones, or
+      # associated records.
+      #
+      # <tt>option_tags</tt> is a string containing the option tags for the select box:
+      #   # Outputs <select id="people" name="people"><option>David</option></select>
+      #   select_tag "people", "<option>David</option>"
+      #
+      # Options:
+      # * <tt>:multiple</tt> - If set to true the selection will allow multiple choices.
       def select_tag(name, option_tags = nil, options = {})
         content_tag("select", option_tags, { "name" => name, "id" => name }.update(convert_options(options)))
       end
 
+      # Creates a standard text field.
+      #
+      # Options:
+      # * <tt>:disabled</tt> - If set to true, the user will not be able to use this input.
+      # * <tt>:size</tt> - The number of visible characters that will fit in the input.
+      # * <tt>:maxlength</tt> - The maximum number of characters that the browser will allow the user to enter.
+      # 
+      # A hash of standard HTML options for the tag.
       def text_field_tag(name, value = nil, options = {})
         tag("input", { "type" => "text", "name" => name, "id" => name, "value" => value }.update(convert_options(options)))
       end
 
+      # Creates a hidden field.
+      #
+      # Takes the same options as text_field_tag
       def hidden_field_tag(name, value = nil, options = {})
         text_field_tag(name, value, options.stringify_keys.update("type" => "hidden"))
       end
 
+      # Creates a file upload field.
+      #
+      # If you are using file uploads then you will also need to set the multipart option for the form:
+      #   <%= form_tag { :action => "post" }, { :multipart => true } %>
+      #     <label for="file">File to Upload</label> <%= file_field_tag "file" %>
+      #     <%= submit_tag %>
+      #   <%= end_form_tag %>
+      #
+      # The specified URL will then be passed a File object containing the selected file, or if the field 
+      # was left blank, a StringIO object.
       def file_field_tag(name, options = {})
         text_field_tag(name, nil, convert_options(options).update("type" => "file"))
       end
 
+      # Creates a password field.
+      #
+      # Takes the same options as text_field_tag
       def password_field_tag(name = "password", value = nil, options = {})
         text_field_tag(name, value, convert_options(options).update("type" => "password"))
       end
 
+      # Creates a text input area.
+      #
+      # Options:
+      # * <tt>:size</tt> - A string specifying the dimensions of the textarea.
+      #     # Outputs <textarea name="body" id="body" cols="25" rows="10"></textarea>
+      #     <%= text_area_tag "body", nil, :size => 25x10 %>
       def text_area_tag(name, content = nil, options = {})
         options = options.stringify_keys
         if options["size"]
@@ -63,22 +106,28 @@ def text_area_tag(name, content = nil, options = {})
         content_tag("textarea", content, { "name" => name, "id" => name }.update(convert_options(options)))
       end
 
+      # Creates a check box.
       def check_box_tag(name, value = "1", checked = false, options = {})
         html_options = { "type" => "checkbox", "name" => name, "id" => name, "value" => value }.update(convert_options(options))
         html_options["checked"] = "checked" if checked
         tag("input", html_options)
       end
 
+      # Creates a radio button.
       def radio_button_tag(name, value, checked = false, options = {})
         html_options = { "type" => "radio", "name" => name, "id" => name, "value" => value }.update(convert_options(options))
         html_options["checked"] = "checked" if checked
         tag("input", html_options)
       end
 
+      # Creates a submit button with the text <tt>value</tt> as the caption.
       def submit_tag(value = "Save changes", options = {})
         tag("input", { "type" => "submit", "name" => "commit", "value" => value }.update(convert_options(options)))
       end
       
+      # Displays an image which when clicked will submit the form.
+      #
+      # <tt>source</tt> is passed to AssetTagHelper#image_path
       def image_submit_tag(source, options = {})
         tag("input", { "type" => "image", "src" => image_path(source) }.update(convert_options(options)))
       end