require 'cgi'
require File.dirname(__FILE__) + '/form_helper'
module ActionView
class Base
@@field_error_proc = Proc.new{ |html_tag, instance| "<div class=\"fieldWithErrors\">#{html_tag}</div>" }
cattr_accessor :field_error_proc
end
module Helpers
# The Active Record Helper makes it easier to create forms for records kept in instance variables. The most far-reaching is the form
# method that creates a complete form for all the basic content types of the record (not associations or aggregations, though). This
# is a great of making the record quickly available for editing, but likely to prove lacklusters for a complicated real-world form.
# In that case, it's better to use the input method and the specialized form methods in link:classes/ActionView/Helpers/FormHelper.html
module ActiveRecordHelper
# Returns a default input tag for the type of object returned by the method. Example
# (title is a VARCHAR column and holds "Hello World"):
# input("post", "title") =>
# <input id="post_title" name="post[title]" size="30" type="text" value="Hello World" />
def input(record_name, method)
InstanceTag.new(record_name, method, self).to_tag
end
# Returns an entire form with input tags and everything for a specified Active Record object. Example
# (post is a new record that has a title using VARCHAR and a body using TEXT):
# form("post") =>
# <form action='create' method='POST'>
# <p>
# <label for="post_title">Title</label><br />
# <input id="post_title" name="post[title]" size="30" type="text" value="Hello World" />
# </p>
# <p>
# <label for="post_body">Body</label><br />
# <textarea cols="40" id="post_body" name="post[body]" rows="20" wrap="virtual">
# Back to the hill and over it again!
# </textarea>
# </p>
# <input type='submit' value='Create' />
# </form>
#
# It's possible to specialize the form builder by using a different action name and by supplying another
# block renderer. Example (entry is a new record that has a message attribute using VARCHAR):
#
# form("entry", :action => "sign", :input_block =>
# Proc.new { |record, column| "#{column.human_name}: #{input(record, column.name)}<br />" }) =>
#
# <form action='sign' method='POST'>
# Message:
# <input id="post_title" name="post[title]" size="30" type="text" value="Hello World" /><br />
# <input type='submit' value='Sign' />
# </form>
def form(record_name, options = {})
record = instance_eval("@#{record_name}")
action = options[:action] || (record.new_record? ? "create" : "update")
id_field = record.new_record? ? "" : InstanceTag.new(record_name, "id", self).to_input_field_tag("hidden")
"<form action='#{action}' method='POST'>" +
id_field + all_input_tags(record, record_name, options) +
"<input type='submit' value='#{action.gsub(/[^A-Za-z]/, "").capitalize}' />" +
"</form>"
end
# Returns a string containing the error message attached to the +method+ on the +object+, if one exists.
# This error message is wrapped in a DIV tag, which can be specialized to include both a +prepend_text+ and +append_text+
# to properly introduce the error and a +css_class+ to style it accordingly. Examples (post has an error message
# "can't be empty" on the title attribute):
#
# <%= error_message_on "post", "title" %> =>
# <div class="formError">can't be empty</div>
#
# <%= error_message_on "post", "title", "Title simply ", " (or it won't work)", "inputError" %> =>
# <div class="inputError">Title simply can't be empty (or it won't work)</div>
def error_message_on(object, method, prepend_text = "", append_text = "", css_class = "formError")
if errors = instance_eval("@#{object}").errors.on(method)
"<div class=\"#{css_class}\">#{prepend_text + (errors.is_a?(Array) ? errors.first : errors) + append_text}</div>"
end
end
def error_messages_for(object_name)
object = instance_eval("@#{object_name}")
unless object.errors.empty?
"<div id=\"errorExplanation\">" +
"<h2>#{object.errors.count} error#{"s" unless object.errors.count == 1} prohibited this #{object_name.gsub("_", " ")} from being saved</h2>" +
"<p>There were problems with the following fields (marked in red below):</p>" +
"<ul>#{object.errors.full_messages.collect { |msg| "<li>#{msg}</li>"}}</ul>" +
"</div>"
end
end
private
def all_input_tags(record, record_name, options)
input_block = options[:input_block] || default_input_block
record.class.content_columns.collect{ |column| input_block.call(record_name, column) }.join("\n")
end
def default_input_block
Proc.new { |record, column| "<p><label for=\"#{record}_#{column.name}\">#{column.human_name}</label><br />#{input(record, column.name)}</p>" }
end
end
class InstanceTag #:nodoc:
def to_tag(options = {})
case column_type
when :string
field_type = @method_name.include?("password") ? "password" : "text"
to_input_field_tag(field_type, options)
when :text
to_text_area_tag(options)
when :integer, :float
to_input_field_tag("text", options)
when :date
to_date_select_tag(options)
when :datetime
to_datetime_select_tag(options)
when :boolean
to_boolean_select_tag(options)
end
end
alias_method :tag_without_error_wrapping, :tag
def tag(name, options)
if object.respond_to?("errors") && object.errors.respond_to?("on")
error_wrapping(tag_without_error_wrapping(name, options), object.errors.on(@method_name))
else
tag_without_error_wrapping(name, options)
end
end
alias_method :content_tag_without_error_wrapping, :content_tag
def content_tag(name, value, options)
if object.respond_to?("errors") && object.errors.respond_to?("on")
error_wrapping(content_tag_without_error_wrapping(name, value, options), object.errors.on(@method_name))
else
content_tag_without_error_wrapping(name, value, options)
end
end
alias_method :to_date_select_tag_without_error_wrapping, :to_date_select_tag
def to_date_select_tag(options = {})
if object.respond_to?("errors") && object.errors.respond_to?("on")
error_wrapping(to_date_select_tag_without_error_wrapping(options), object.errors.on(@method_name))
else
to_date_select_tag_without_error_wrapping(options)
end
end
alias_method :to_datetime_select_tag_without_error_wrapping, :to_datetime_select_tag
def to_datetime_select_tag(options = {})
if object.respond_to?("errors") && object.errors.respond_to?("on")
error_wrapping(to_datetime_select_tag_without_error_wrapping(options), object.errors.on(@method_name))
else
to_datetime_select_tag_without_error_wrapping(options)
end
end
def error_wrapping(html_tag, has_error)
has_error ? Base.field_error_proc.call(html_tag, self) : html_tag
end
def error_message
object.errors.on(@method_name)
end
def column_type
object.send("column_for_attribute", @method_name).type
end
end
end
end