require 'cgi' require File.dirname(__FILE__) + '/date_helper' require File.dirname(__FILE__) + '/tag_helper' module ActionView module Helpers # Provides a set of methods for working with forms and especially forms related to objects assigned to the template. # The following is an example of a complete form for a person object that works for both creates and updates built # with all the form helpers. The @person object was assigned by an action on the controller: #
# Name: # <%= text_field "person", "name", "size" => 20 %> # # Password: # <%= password_field "person", "password", "maxsize" => 20 %> # # Single?: # <%= check_box "person", "single" %> # # Description: # <%= text_area "person", "description", "cols" => 20 %> # # #
# # ...is compiled to: # #
# Name: # # # Password: # # # Single?: # # # Description: # # # #
# # There's also methods for helping to build form tags in link:classes/ActionView/Helpers/FormOptionsHelper.html, # link:classes/ActionView/Helpers/DateHelper.html, and link:classes/ActionView/Helpers/ActiveRecordHelper.html module FormHelper # 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+. # # Examples (call, result): # text_field("post", "title", "size" => 20) # def text_field(object, method, options = {}) InstanceTag.new(object, method, self).to_input_field_tag("text", options) end # Works just like text_field, but returns a input tag of the "password" type instead. def password_field(object, method, options = {}) InstanceTag.new(object, method, self).to_input_field_tag("password", options) end # Works just like text_field, but returns a input tag of the "hidden" type instead. def hidden_field(object, method, options = {}) InstanceTag.new(object, method, self).to_input_field_tag("hidden", options) end # Returns a textarea opening and closing tag set 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+. # # Example (call, result): # text_area("post", "body", "cols" => 20, "rows" => 40) # def text_area(object, method, options = {}) InstanceTag.new(object, method, self).to_text_area_tag(options) end # Returns a checkbox tag tailored for accessing a specified attribute (identified by +method+) on an object # assigned to the template (identified by +object+). It's intended that +method+ returns an integer and if that # integer is above zero, then the checkbox is checked. Additional options on the input tag can be passed as a # hash with +options+. The +checked_value+ defaults to 1 while the default +unchecked_value+ # is set to 0 which is convenient for boolean values. Usually unchecked checkboxes don't post anything. # We work around this problem by adding a hidden value with the same name as the checkbox. # # Example (call, result). Imagine that @post.validated? returns 1: # check_box("post", "validated") # # # # Example (call, result). Imagine that @puppy.gooddog returns no: # check_box("puppy", "gooddog", {}, "yes", "no") # # def check_box(object, method, options = {}, checked_value = "1", unchecked_value = "0") InstanceTag.new(object, method, self).to_check_box_tag(options, checked_value, unchecked_value) end # Returns a radio button tag for accessing a specified attribute (identified by +method+) on an object # assigned to the template (identified by +object+). If the current value of +method+ is +tag_value+ the # radio button will be checked. Additional options on the input tag can be passed as a # hash with +options+. # Example (call, result). Imagine that @post.category returns "rails": # radio_button("post", "category", "rails") # radio_button("post", "category", "java") # # # def radio_button(object, method, tag_value, options = {}) InstanceTag.new(object, method, self).to_radio_button_tag(tag_value, options) end end class InstanceTag #:nodoc: include Helpers::TagHelper attr_reader :method_name, :object_name DEFAULT_FIELD_OPTIONS = { "size" => 30 } unless const_defined?("DEFAULT_FIELD_OPTIONS") DEFAULT_TEXT_AREA_OPTIONS = { "wrap" => "virtual", "cols" => 40, "rows" => 20 } unless const_defined?("DEFAULT_TEXT_AREA_OPTIONS") def initialize(object_name, method_name, template_object, local_binding = nil) @object_name, @method_name = object_name, method_name @template_object, @local_binding = template_object, local_binding end def to_input_field_tag(field_type, options = {}) html_options = DEFAULT_FIELD_OPTIONS.merge(options) html_options.merge!({ "size" => options["maxlength"]}) if options["maxlength"] && !options["size"] html_options.delete("size") if field_type == "hidden" html_options.merge!({ "type" => field_type}) html_options.merge!({ "value" => value_before_type_cast }) unless options["value"] add_default_name_and_id(html_options) tag("input", html_options) end def to_radio_button_tag(tag_value, options={}) html_options = DEFAULT_FIELD_OPTIONS.merge(options) html_options.merge!({ "checked" => "checked" }) if value == tag_value html_options.merge!({ "type" => "radio", "value"=> tag_value.to_s }) add_default_name_and_id(html_options) tag("input", html_options) end def to_text_area_tag(options = {}) options = DEFAULT_TEXT_AREA_OPTIONS.merge(options) add_default_name_and_id(options) content_tag("textarea", html_escape(value_before_type_cast), options) end def to_check_box_tag(options = {}, checked_value = "1", unchecked_value = "0") options.merge!({ "checked" => "checked" }) if !value.nil? && ((value.is_a?(TrueClass) || value.is_a?(FalseClass)) ? value : value.to_i > 0) options.merge!({ "type" => "checkbox", "value" => checked_value }) add_default_name_and_id(options) tag("input", options) << tag("input", ({ "name" => options['name'], "type" => "hidden", "value" => unchecked_value })) end def to_date_tag() defaults = { "discard_type" => true } date = value || Date.today options = Proc.new { |position| defaults.update({ :prefix => "#{@object_name}[#{@method_name}(#{position}i)]" }) } html_day_select(date, options.call(3)) + html_month_select(date, options.call(2)) + html_year_select(date, options.call(1)) end def to_boolean_select_tag(options = {}) add_default_name_and_id(options) tag_text = "" end def object @template_object.instance_variable_get "@#{@object_name}" end def value object.send(@method_name) unless object.nil? end def value_before_type_cast unless object.nil? object.respond_to?(@method_name + "_before_type_cast") ? object.send(@method_name + "_before_type_cast") : object.send(@method_name) end end private def add_default_name_and_id(options) options['name'] = tag_name unless options.has_key? "name" options['id'] = tag_id unless options.has_key? "id" end def tag_name "#{@object_name}[#{@method_name}]" end def tag_id "#{@object_name}_#{@method_name}" end end end end