/usr/lib/ruby/vendor_ruby/ramaze/helper/blue_form.rb is in ruby-ramaze 2012.12.08-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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require 'ramaze/gestalt'
module Ramaze
module Helper
##
# The BlueForm helper tries to be an even better way to build forms
# programmatically. By using a simple block you can quickly create all the
# required elements for your form.
#
# See {Ramaze::Helper::BlueForm::Form} for all the available methods.
#
# ## Form Data
#
# As stated earlier it's possible to pass an object to the form_for()
# method. What kind of object this is, a database result object or an
# OpenStruct object doesn't matter as long as the attributes can be accessed
# outside of the object (this can be done using attr_readers). This makes it
# extremely easy to directly pass a result object from your favourite ORM.
# Example:
#
# @data = User[1]
#
# form_for(@data, :method => :post) do |f|
# f.input_text 'Username', :username
# end
#
# The object comes handy when you want to do server-side form validation:
# if the form can not be validated, just send back the object with keys
# containing what the user has filled. The fields will be populated with
# these values, so the user doesn't have to retype everything.
#
# If you don't want to use an object you can simply set the first parameter
# to nil.
#
# ## HTML Output
#
# The form helper uses Gestalt, Ramaze's custom HTML builder that works
# somewhat like Erector. The output is very minimalistic, elements such as
# legends and fieldsets have to be added manually.
#
# If you need to add elements not covered by Form methods (e.g. `<div>`
# tags), you can access the form Gestalt instance with the g() method and
# generate your tags like this :
#
# form_for(@result, :method => :post) do |f|
# f.g.div(:class => "awesome") do
# ...
# end
# end
#
# Each combination of a label and input element will be wrapped in
# `<p>` tags.
#
# When using the form helper as a block in your templates it's important to
# remember that the result is returned and not displayed in the browser
# directly. When using Etanni this would result in something like the
# following:
#
# #{form_for(@result, :method => :post) do |f|
# f.input_text 'Text label', :textname, 'Chunky bacon!'
# end}
#
# @example Creating a basic form
# form_for(@data, :method => :post) do |f|
# f.input_text 'Username', :username
# end
#
# @example Adding custom elements inside a form
# form_for(@result, :method => :post) do |f|
# f.fieldset do
# f.g.div(:class => "control-group") do
# f.input_text 'Text label', :textname, { :placeholder => 'Chunky bacon!',
# :class => :bigsize }
# end
# end
# end
#
module BlueForm
##
# The form method generates the basic structure of the form. It should be
# called using a block and it's return value should be manually sent to
# the browser (since it does not echo the value).
#
# @param [Object] form_values Object containing the values for each form
# field.
# @param [Hash] options Hash containing any additional form attributes
# such as the method, action, enctype and so on.
# @param [Block] block Block containing the elements of the form such as
# password fields, textareas and so on.
#
def form_for(form_values, options = {}, &block)
form = Form.new(form_values, options)
form.build(form_errors, &block)
form
end
##
# Manually add a new error to the form_errors key in the flash hash. The
# first parameter is the name of the form field and the second parameter
# is the custom message.
#
# @param [String] name The name of the form field to which the error
# belongs.
# @param [String] message The custom error message to show.
#
def form_error(name, message)
if respond_to?(:flash)
old = flash[:form_errors] || {}
flash[:form_errors] = old.merge(name.to_s => message.to_s)
else
form_errors[name.to_s] = message.to_s
end
end
##
# Returns the hash containing all existing errors and allows other methods
# to set new errors by using this method as if it were a hash.
#
# @return [Array] All form errors.
#
def form_errors
if respond_to?(:flash)
flash[:form_errors] ||= {}
else
@form_errors ||= {}
end
end
##
# Retrieve all the form errors for the specified model and add them to the
# flash hash.
#
# @param [Object] obj An object of a model that contains form errors.
#
def form_errors_from_model(obj)
if obj.respond_to?(:errors)
obj.errors.each do |key, value|
if value.respond_to?(:first)
value = value.first
end
form_error(key.to_s, value % key)
end
end
end
##
# Main form class that contains all the required methods to generate form
# specific tags, such as textareas and select boxes. Do note that this
# class is not thread-safe so you should modify it only within one thread
# of execution.
#
class Form
attr_reader :g
attr_reader :form_values
##
# Constructor method that generates an instance of the Form class.
#
# @param [Object] form_values Object containing the values for each form
# field.
# @param [Hash] options A hash containing any additional form attributes.
# @return [Object] An instance of the Form class.
#
def initialize(form_values, options)
@form_values = form_values
@form_args = options.dup
@g = Gestalt.new
end
##
# Builds the form by generating the opening/closing tags and executing
# the methods in the block.
#
# @param [Hash] form_errors Hash containing all form errors (if any).
#
def build(form_errors = {})
# Convert all the keys in form_errors to strings and
# retrieve the correct values in case
@form_errors = {}
form_errors.each do |key, value|
if value.respond_to?(:first)
value = value.first
end
@form_errors[key.to_s] = value
end
@g.form(@form_args) do
if block_given?
yield self
end
end
end
##
# Generate a `<legend>` tag.
#
# @param [String] text The text to display inside the legend tag.
# @example
# form_for(@data, :method => :post) do |f|
# f.legend 'Ramaze rocks!'
# end
#
def legend(text)
@g.legend(text)
end
##
# Generate a fieldset tag.
#
# @param [Proc] block The form elements to display inside the fieldset.
# @example
# form_for(@data, :method => :post) do |f|
# f.fieldset do
# f.legend 'Hello, world!'
# end
# end
#
def fieldset(&block)
@g.fieldset(&block)
end
##
# Generate an input tag with a type of "text" along with a label tag.
# This method also has the alias "text" so feel free to use that one
# instead of input_text.
#
# @param [String] label The text to display inside the label tag.
# @param [String Symbol] name The name of the text field.
# @param [Hash] args Any additional HTML attributes along with their
# values.
# @example
# form_for(@data, :method => :post) do |f|
# f.input_text 'Username', :username
# end
#
def input_text(label, name, args = {})
# The ID can come from 2 places, id_for and the args hash
id = args[:id] ? args[:id] : id_for(name)
args = args.merge(:type => :text, :name => name, :id => id)
if !args[:value] and @form_values.respond_to?(name)
args[:value] = @form_values.send(name)
end
@g.p do
label_for(id, label, name)
@g.input(args)
end
end
alias text input_text
##
# Generate an input tag with a type of "password" along with a label.
# Password fields are pretty much the same as text fields except that
# the content of these fields is replaced with dots. This method has the
# following alias: "password".
#
# @param [String] label The text to display inside the label tag.
# @param [String Symbol] name The name of the password field.
# @param [Hash] args Any additional HTML attributes along with their
# values.
# @example
# form_for(@data, :method => :post) do |f|
# f.input_password 'My password', :password
# end
#
def input_password(label, name, args = {})
# The ID can come from 2 places, id_for and the args hash
id = args[:id] ? args[:id] : id_for(name)
args = args.merge(:type => :password, :name => name, :id => id)
if !args[:value] and @form_values.respond_to?(name)
args[:value] = @form_values.send(name)
end
@g.p do
label_for(id, label, name)
@g.input(args)
end
end
alias password input_password
##
# Generate a submit tag (without a label). A submit tag is a button that
# once it's clicked will send the form data to the server.
#
# @param [String] value The text to display in the button.
# @param [Hash] args Any additional HTML attributes along with their
# values.
# @example
# form_for(@data, :method => :post) do |f|
# f.input_submit 'Save'
# end
#
def input_submit(value = nil, args = {})
args = args.merge(:type => :submit)
args[:value] = value unless value.nil?
@g.p do
@g.input(args)
end
end
alias submit input_submit
##
# Generate an input tag with a type of "checkbox".
#
# If you want to have multiple checkboxes you can either use an array or
# a hash. In the case of an array the values will also be used as text
# for each checkbox. When using a hash the key will be displayed and
# the value will be the value of the checkbox. Example:
#
# @data = Class.new
# attr_reader :gender_arr
# attr_reader :gender_hash
#
# def initialize
# @gender_arr = ['male', 'female']
# @gender_hash = {"Male" => "male", "Female" => "female"}
# end
# end.new
#
# form_for(@data, :method => :post) do |f|
# f.input_checkbox "Gender", :gender_arr
# f.input_checkbox "Gender", :gender_hash
# end
#
# @example
# form_for(@data, :method => :post) do |f|
# f.input_checkbox 'Remember me', :remember_user
# end
#
# @param [String] label The text to display inside the label tag.
# @param [String Symbol] name The name of the checkbox.
# @param [String/Array] checked String or array that indicates which
# value(s) should be checked.
# @param [Hash] args Any additional HTML attributes along with their
# values.
# @option args [String/Symbol] :id The value to use for the ID attribute.
# @option args [Array] :values An array containing the possible values
# for the checkboxes.
# @option args [String/Symbol] :span_class The class to use for the
# `<span>` element that's wrapped around the checkbox.
# @option args [TrueClass/FalseClass] :show_value When set to false the
# value of each checkbox won't be displayed to the right of the
# checkbox. This option is set to true by default.
# @option args [TrueClass/FalseClass] :show_label When set to true
# (default) the label for the checkbox will be displayed. Setting this
# to false will hide it.
#
def input_checkbox(label, name, checked = nil, args = {})
id = args[:id] ? args[:id] : "#{id_for(name)}_0"
# Determine whether or not to show the value of the checkbox
if args.key?(:show_value)
show_value = args.delete(:show_value)
else
show_value = true
end
# Determine whether or not to show the label
if args.key?(:show_label)
show_label = args.delete(:show_label)
else
show_label = true
end
# Get the checkbox value from either the args hash or from
# the form object (as specified in the form_for() method).
if !args[:values] and @form_values.respond_to?(name)
args[:values] = @form_values.send(name)
end
# That class for each element wrapper (a span tag) can be customized
# using :span_class => "a_class".
if args[:span_class]
span_class = args[:span_class]
args.delete(:span_class)
else
span_class = "checkbox_wrap"
end
# Get the type from the args hash instead of pre-defining it. Doing so
# means we can use this method for the input_radio method.
args[:type] = :checkbox if !args[:type]
# Convert the values to an array if it's something we can't use in a loop
# (e.g. a string).
if args[:values].class != Hash and args[:values].class != Array
args[:values] = [args[:values]]
end
# Create a checkbox for each value
if !args[:values].empty?
@g.p do
# Let's create the label and the hidden field
if show_label === true
label_for(id, label, name)
end
# Loop through all the values. Each checkbox will have an ID of
# "form-NAME-INDEX". Each name will be NAME followed by [] to
# indicate it's an array (since multiple values are possible).
args[:values].each_with_index do |value, index|
id = args[:id] ? args[:id] : "#{id_for(name)}_#{index}"
if args[:type] == :checkbox
checkbox_name = "#{name}[]"
else
checkbox_name = name
end
# Copy all additional attributes and their values except the
# values array.
opts = args.clone
opts.delete(:values)
# Get the value and text to display for each checkbox
if value.class == Array
checkbox_text = value[0]
checkbox_value = value[1]
else
checkbox_text = checkbox_value = value
end
# Let's see if the current item is checked
if checked.class == Array
if checked.include?(checkbox_value)
opts[:checked] = 'checked'
end
else
if checkbox_value == checked
opts[:checked] = 'checked'
end
end
# And we're done, easy wasn't it?
opts = opts.merge(
:name => checkbox_name, :id => id, :value => checkbox_value
)
# Generate the following HTML:
#
# <span class="#{span_class}">
# <input type="checkbox" name="#{checkbox_name}" id="#{id}"
# value="#{value}" /> #{value}
# </span>
#
@g.span(:class => span_class) do
@g.input(opts)
" #{checkbox_text}" if show_value === true
end
end
end
end
end
alias checkbox input_checkbox
##
# Generate an input tag with a type of "radio".
#
# If you want to generate multiple radio buttons you can use an array
# just like you can with checkboxes. Example:
#
# @data = Class.new
# attr_reader :gender_arr
# attr_reader :gender_hash
#
# def initialize
# @gender_arr = ['male', 'female']
# @gender_hash = {"Male" => "male", "Female" => "female"}
# end
# end.new
#
# form_for(@data, :method => :post) do |f|
# f.input_radio "Gender", :gender_arr
# f.input_radio "Gender", :gender_hash
# end
#
# For more information see the input_checkbox() method.
#
# @param [String] label The text to display inside the label tag.
# @param [String Symbol] name The name of the radio button.
# @param [String] checked String that indicates if (and which) radio
# button should be checked.
# @param [Hash] args Any additional HTML attributes along with their
# values.
# @see input_checkbox()
# @example
# form_for(@data, :method => :post) do |f|
# f.input_radio 'Gender', :gender
# end
#
def input_radio(label, name, checked = nil, args = {})
# Force a type of "radio"
args[:type] = :radio
if !args[:span_class]
args[:span_class] = "radio_wrap"
end
self.input_checkbox(label, name, checked, args)
end
alias radio input_radio
##
# Generate a field for uploading files.
#
# @param [String] label The text to display inside the label tag.
# @param [String Symbol] name The name of the radio tag.
# @param [Hash] args Any additional HTML attributes along with their
# values.
# @example
# form_for(@data, :method => :post) do |f|
# f.input_file 'Image', :image
# end
#
def input_file(label, name, args = {})
id = args[:id] ? args[:id] : id_for(name)
args = args.merge(:type => :file, :name => name, :id => id)
@g.p do
label_for(id, label, name)
@g.input(args)
end
end
alias file input_file
##
# Generate a hidden field. Hidden fields are essentially the same as
# text fields except that they aren't displayed in the browser.
#
# @param [String Symbol] name The name of the hidden field tag.
# @param [String] value The value of the hidden field
# @param [Hash] args Any additional HTML attributes along with their
# values.
# @example
# form_for(@data, :method => :post) do |f|
# f.input_hidden :user_id
# end
#
def input_hidden(name, value = nil, args = {})
args = args.merge(:type => :hidden, :name => name)
if !value and @form_values.respond_to?(name)
args[:value] = @form_values.send(name)
else
args[:value] = value
end
@g.input(args)
end
alias hidden input_hidden
##
# Generate a text area.
#
# @param [String] label The text to display inside the label tag.
# @param [String Symbol] name The name of the textarea.
# @param [Hash] args Any additional HTML attributes along with their
# values.
# @example
# form_for(@data, :method => :post) do |f|
# f.textarea 'Description', :description
# end
#
def textarea(label, name, args = {})
id = args[:id] ? args[:id] : id_for(name)
# Get the value of the textarea
if !args[:value] and @form_values.respond_to?(name)
value = @form_values.send(name)
else
value = args[:value]
args.delete(:value)
end
args = args.merge(:name => name, :id => id)
@g.p do
label_for(id, label, name)
@g.textarea(args){ value }
end
end
##
# Generate a select tag along with the option tags and a label.
#
# @param [String] label The text to display inside the label tag.
# @param [String Symbol] name The name of the select tag.
# @param [Hash] args Hash containing additional HTML attributes.
# @example
# form_for(@data, :method => :post) do |f|
# f.select 'Country', :country_list
# end
#
def select(label, name, args = {})
id = args[:id] ? args[:id] : id_for(name)
multiple, size = args.values_at(:multiple, :size)
# Get all the values
if !args[:values] and @form_values.respond_to?(name)
values = @form_values.send(name)
else
values = args[:values]
args.delete(:values)
end
args[:multiple] = 'multiple' if multiple
args[:size] = (size || values.count || 1).to_i
args[:name] = multiple ? "#{name}[]" : name
args = args.merge(:id => id)
# Retrieve the selected value
has_selected, selected = args.key?(:selected), args[:selected]
selected = [selected] if !selected.is_a?(Array)
args.delete(:selected)
@g.p do
label_for(id, label, name)
@g.select args do
values.each do |value, o_name|
o_name ||= value
o_args = {:value => value}
if has_selected and selected.include?(value)
o_args[:selected] = 'selected'
end
@g.option(o_args){ o_name }
end
end
end
end
##
# Method used for converting the results of the BlueForm helper to a
# string
#
# @return [String] The form output
#
def to_s
@g.to_s
end
private
##
# Generate a label based on the id and value.
#
# @param [String] id The ID to which the label belongs.
# @param [String] value The text to display inside the label tag.
# @param [String] name The name of the field to which the label belongs.
#
def label_for(id, value, name)
if error = @form_errors.delete(name.to_s)
@g.label("#{value} ", :for => id){ @g.span(:class => :error){ error } }
else
@g.label(value, :for => id)
end
end
##
# Generate a value for an ID tag based on the field's name.
#
# @param [String] field_name The name of the field.
# @return [String] The ID for the specified field name.
#
def id_for(field_name)
if name = @form_args[:name]
"#{name}_#{field_name}".downcase.gsub(/-/, '_')
else
"form_#{field_name}".downcase.gsub(/-/, '_')
end
end
end # Form
end # BlueForm
end # Helper
end # Ramaze
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