require 'cgi' require 'erb' require 'action_view/helpers/form_helper' require 'active_support/core_ext/object/blank' require 'active_support/core_ext/string/output_safety' module ActionView # = Action View Form Option Helpers module Helpers # Provides a number of methods for turning different kinds of containers into a set of option tags. # == Options # The collection_select, select and time_zone_select methods take an options parameter, a hash: # # * :include_blank - set to true or a prompt string if the first option element of the select element is a blank. Useful if there is not a default value required for the select element. # # For example, # # select("post", "category", Post::CATEGORIES, {:include_blank => true}) # # could become: # # # # Another common case is a select tag for an belongs_to-associated object. # # Example with @post.person_id => 2: # # select("post", "person_id", Person.all.collect {|p| [ p.name, p.id ] }, {:include_blank => 'None'}) # # could become: # # # # * :prompt - set to true or a prompt string. When the select element doesn't have a value yet, this prepends an option with a generic prompt -- "Please select" -- or the given prompt string. # # Example: # # select("post", "person_id", Person.all.collect {|p| [ p.name, p.id ] }, {:prompt => 'Select Person'}) # # could become: # # # # Like the other form helpers, +select+ can accept an :index option to manually set the ID used in the resulting output. Unlike other helpers, +select+ expects this # option to be in the +html_options+ parameter. # # Example: # # select("album[]", "genre", %w[rap rock country], {}, { :index => nil }) # # becomes: # # # # * :disabled - can be a single value or an array of values that will be disabled options in the final output. # # Example: # # select("post", "category", Post::CATEGORIES, {:disabled => 'restricted'}) # # could become: # # # # When used with the collection_select helper, :disabled can also be a Proc that identifies those options that should be disabled. # # Example: # # collection_select(:post, :category_id, Category.all, :id, :name, {:disabled => lambda{|category| category.archived? }}) # # If the categories "2008 stuff" and "Christmas" return true when the method archived? is called, this would return: # # module FormOptionsHelper # ERB::Util can mask some helpers like textilize. Make sure to include them. include TextHelper # Create a select tag and a series of contained option tags for the provided object and method. # The option currently held by the object will be selected, provided that the object is available. # # There are two possible formats for the choices parameter, corresponding to other helpers' output: # * A flat collection: see options_for_select # * A nested collection: see grouped_options_for_select # # Example with @post.person_id => 1: # select("post", "person_id", Person.all.collect {|p| [ p.name, p.id ] }, { :include_blank => true }) # # could become: # # # # This can be used to provide a default set of options in the standard way: before rendering the create form, a # new model instance is assigned the default options and bound to @model_name. Usually this model is not saved # to the database. Instead, a second model object is created when the create request is received. # This allows the user to submit a form page more than once with the expected results of creating multiple records. # In addition, this allows a single partial to be used to generate form inputs for both edit and create forms. # # By default, post.person_id is the selected option. Specify :selected => value to use a different selection # or :selected => nil to leave all options unselected. Similarly, you can specify values to be disabled in the option # tags by specifying the :disabled option. This can either be a single value or an array of values to be disabled. # # ==== Gotcha # # The HTML specification says when +multiple+ parameter passed to select and all options got deselected # web browsers do not send any value to server. Unfortunately this introduces a gotcha: # if an +User+ model has many +roles+ and have +role_ids+ accessor, and in the form that edits roles of the user # the user deselects all roles from +role_ids+ multiple select box, no +role_ids+ parameter is sent. So, # any mass-assignment idiom like # # @user.update_attributes(params[:user]) # # wouldn't update roles. # # To prevent this the helper generates an auxiliary hidden field before # every multiple select. The hidden field has the same name as multiple select and blank value. # # This way, the client either sends only the hidden field (representing # the deselected multiple select box), or both fields. Since the HTML specification # says key/value pairs have to be sent in the same order they appear in the # form, and parameters extraction gets the last occurrence of any repeated # key in the query string, that works for ordinary forms. # def select(object, method, choices, options = {}, html_options = {}) Tags::Select.new(object, method, self, choices, options, html_options).render end # Returns # # # # # def collection_select(object, method, collection, value_method, text_method, options = {}, html_options = {}) Tags::CollectionSelect.new(object, method, self, collection, value_method, text_method, options, html_options).render end # Returns # # # # # # # # # # def grouped_collection_select(object, method, collection, group_method, group_label_method, option_key_method, option_value_method, options = {}, html_options = {}) Tags::GroupedCollectionSelect.new(object, method, self, collection, group_method, group_label_method, option_key_method, option_value_method, options, html_options).render end # Return select and option tags for the given object and method, using # #time_zone_options_for_select to generate the list of option tags. # # In addition to the :include_blank option documented above, # this method also supports a :model option, which defaults # to ActiveSupport::TimeZone. This may be used by users to specify a # different time zone model object. (See +time_zone_options_for_select+ # for more information.) # # You can also supply an array of ActiveSupport::TimeZone objects # as +priority_zones+, so that they will be listed above the rest of the # (long) list. (You can use ActiveSupport::TimeZone.us_zones as a convenience # for obtaining a list of the US time zones, or a Regexp to select the zones # of your choice) # # Finally, this method supports a :default option, which selects # a default ActiveSupport::TimeZone if the object's time zone is +nil+. # # Examples: # time_zone_select( "user", "time_zone", nil, :include_blank => true) # # time_zone_select( "user", "time_zone", nil, :default => "Pacific Time (US & Canada)" ) # # time_zone_select( "user", 'time_zone', ActiveSupport::TimeZone.us_zones, :default => "Pacific Time (US & Canada)") # # time_zone_select( "user", 'time_zone', [ ActiveSupport::TimeZone['Alaska'], ActiveSupport::TimeZone['Hawaii'] ]) # # time_zone_select( "user", 'time_zone', /Australia/) # # time_zone_select( "user", "time_zone", ActiveSupport::TimeZone.all.sort, :model => ActiveSupport::TimeZone) def time_zone_select(object, method, priority_zones = nil, options = {}, html_options = {}) Tags::TimeZoneSelect.new(object, method, self, priority_zones, options, html_options).render end # Accepts a container (hash, array, enumerable, your type) and returns a string of option tags. Given a container # where the elements respond to first and last (such as a two-element array), the "lasts" serve as option values and # the "firsts" as option text. Hashes are turned into this form automatically, so the keys become "firsts" and values # become lasts. If +selected+ is specified, the matching "last" or element will get the selected option-tag. +selected+ # may also be an array of values to be selected when using a multiple select. # # Examples (call, result): # options_for_select([["Dollar", "$"], ["Kroner", "DKK"]]) # \n # # options_for_select([ "VISA", "MasterCard" ], "MasterCard") # \n # # options_for_select({ "Basic" => "$20", "Plus" => "$40" }, "$40") # \n # # options_for_select([ "VISA", "MasterCard", "Discover" ], ["VISA", "Discover"]) # \n\n # # You can optionally provide html attributes as the last element of the array. # # Examples: # options_for_select([ "Denmark", ["USA", {:class => 'bold'}], "Sweden" ], ["USA", "Sweden"]) # \n\n # # options_for_select([["Dollar", "$", {:class => "bold"}], ["Kroner", "DKK", {:onclick => "alert('HI');"}]]) # \n # # If you wish to specify disabled option tags, set +selected+ to be a hash, with :disabled being either a value # or array of values to be disabled. In this case, you can use :selected to specify selected option tags. # # Examples: # options_for_select(["Free", "Basic", "Advanced", "Super Platinum"], :disabled => "Super Platinum") # \n\n\n # # options_for_select(["Free", "Basic", "Advanced", "Super Platinum"], :disabled => ["Advanced", "Super Platinum"]) # \n\n\n # # options_for_select(["Free", "Basic", "Advanced", "Super Platinum"], :selected => "Free", :disabled => "Super Platinum") # \n\n\n # # NOTE: Only the option tags are returned, you have to wrap this call in a regular HTML select tag. def options_for_select(container, selected = nil) return container if String === container selected, disabled = extract_selected_and_disabled(selected).map do |r| Array(r).map { |item| item.to_s } end container.map do |element| html_attributes = option_html_attributes(element) text, value = option_text_and_value(element).map { |item| item.to_s } selected_attribute = ' selected="selected"' if option_value_selected?(value, selected) disabled_attribute = ' disabled="disabled"' if disabled && option_value_selected?(value, disabled) %() end.join("\n").html_safe end # Returns a string of option tags that have been compiled by iterating over the +collection+ and assigning # the result of a call to the +value_method+ as the option value and the +text_method+ as the option text. # Example: # options_from_collection_for_select(@people, 'id', 'name') # This will output the same HTML as if you did this: # # # This is more often than not used inside a #select_tag like this example: # select_tag 'person', options_from_collection_for_select(@people, 'id', 'name') # # If +selected+ is specified as a value or array of values, the element(s) returning a match on +value_method+ # will be selected option tag(s). # # If +selected+ is specified as a Proc, those members of the collection that return true for the anonymous # function are the selected values. # # +selected+ can also be a hash, specifying both :selected and/or :disabled values as required. # # Be sure to specify the same class as the +value_method+ when specifying selected or disabled options. # Failure to do this will produce undesired results. Example: # options_from_collection_for_select(@people, 'id', 'name', '1') # Will not select a person with the id of 1 because 1 (an Integer) is not the same as '1' (a string) # options_from_collection_for_select(@people, 'id', 'name', 1) # should produce the desired results. def options_from_collection_for_select(collection, value_method, text_method, selected = nil) options = collection.map do |element| [element.send(text_method), element.send(value_method)] end selected, disabled = extract_selected_and_disabled(selected) select_deselect = {} select_deselect[:selected] = extract_values_from_collection(collection, value_method, selected) select_deselect[:disabled] = extract_values_from_collection(collection, value_method, disabled) options_for_select(options, select_deselect) end # Returns a string of tags, like options_from_collection_for_select, but # groups them by tags based on the object relationships of the arguments. # # Parameters: # * +collection+ - An array of objects representing the tags. # * +group_method+ - The name of a method which, when called on a member of +collection+, returns an # array of child objects representing the tags. # * group_label_method+ - The name of a method which, when called on a member of +collection+, returns a # string to be used as the +label+ attribute for its tag. # * +option_key_method+ - The name of a method which, when called on a child object of a member of # +collection+, returns a value to be used as the +value+ attribute for its tag. # * +option_value_method+ - The name of a method which, when called on a child object of a member of # +collection+, returns a value to be used as the contents of its tag. # * +selected_key+ - A value equal to the +value+ attribute for one of the tags, # which will have the +selected+ attribute set. Corresponds to the return value of one of the calls # to +option_key_method+. If +nil+, no selection is made. Can also be a hash if disabled values are # to be specified. # # Example object structure for use with this method: # class Continent < ActiveRecord::Base # has_many :countries # # attribs: id, name # end # class Country < ActiveRecord::Base # belongs_to :continent # # attribs: id, name, continent_id # end # # Sample usage: # option_groups_from_collection_for_select(@continents, :countries, :name, :id, :name, 3) # # Possible output: # # # # ... # # # # # # ... # # # Note: Only the and tags are returned, so you still have to # wrap the output in an appropriate tag. def grouped_options_for_select(grouped_options, selected_key = nil, prompt = nil) body = '' body << content_tag(:option, prompt, { :value => "" }, true) if prompt grouped_options = grouped_options.sort if grouped_options.is_a?(Hash) grouped_options.each do |group| body << content_tag(:optgroup, options_for_select(group[1], selected_key), :label => group[0]) end body.html_safe end # Returns a string of option tags for pretty much any time zone in the # world. Supply a ActiveSupport::TimeZone name as +selected+ to have it # marked as the selected option tag. You can also supply an array of # ActiveSupport::TimeZone objects as +priority_zones+, so that they will # be listed above the rest of the (long) list. (You can use # ActiveSupport::TimeZone.us_zones as a convenience for obtaining a list # of the US time zones, or a Regexp to select the zones of your choice) # # The +selected+ parameter must be either +nil+, or a string that names # a ActiveSupport::TimeZone. # # By default, +model+ is the ActiveSupport::TimeZone constant (which can # be obtained in Active Record as a value object). The only requirement # is that the +model+ parameter be an object that responds to +all+, and # returns an array of objects that represent time zones. # # NOTE: Only the option tags are returned, you have to wrap this call in # a regular HTML select tag. def time_zone_options_for_select(selected = nil, priority_zones = nil, model = ::ActiveSupport::TimeZone) zone_options = "" zones = model.all convert_zones = lambda { |list| list.map { |z| [ z.to_s, z.name ] } } if priority_zones if priority_zones.is_a?(Regexp) priority_zones = model.all.find_all {|z| z =~ priority_zones} end zone_options += options_for_select(convert_zones[priority_zones], selected) zone_options += "\n" zones = zones.reject { |z| priority_zones.include?( z ) } end zone_options += options_for_select(convert_zones[zones], selected) zone_options.html_safe end private def option_html_attributes(element) return "" unless Array === element html_attributes = [] element.select { |e| Hash === e }.reduce({}, :merge).each do |k, v| html_attributes << " #{k}=\"#{ERB::Util.html_escape(v.to_s)}\"" end html_attributes.join end def option_text_and_value(option) # Options are [text, value] pairs or strings used for both. case when Array === option option = option.reject { |e| Hash === e } [option.first, option.last] when !option.is_a?(String) && option.respond_to?(:first) && option.respond_to?(:last) [option.first, option.last] else [option, option] end end def option_value_selected?(value, selected) if selected.respond_to?(:include?) && !selected.is_a?(String) selected.include? value else value == selected end end def extract_selected_and_disabled(selected) if selected.is_a?(Proc) [ selected, nil ] else selected = Array.wrap(selected) options = selected.extract_options!.symbolize_keys selected_items = options.include?(:selected) ? options[:selected] : selected [ selected_items, options[:disabled] ] end end def extract_values_from_collection(collection, value_method, selected) if selected.is_a?(Proc) collection.map do |element| element.send(value_method) if selected.call(element) end.compact else selected end end end class FormBuilder def select(method, choices, options = {}, html_options = {}) @template.select(@object_name, method, choices, objectify_options(options), @default_options.merge(html_options)) end def collection_select(method, collection, value_method, text_method, options = {}, html_options = {}) @template.collection_select(@object_name, method, collection, value_method, text_method, objectify_options(options), @default_options.merge(html_options)) end def grouped_collection_select(method, collection, group_method, group_label_method, option_key_method, option_value_method, options = {}, html_options = {}) @template.grouped_collection_select(@object_name, method, collection, group_method, group_label_method, option_key_method, option_value_method, objectify_options(options), @default_options.merge(html_options)) end def time_zone_select(method, priority_zones = nil, options = {}, html_options = {}) @template.time_zone_select(@object_name, method, priority_zones, objectify_options(options), @default_options.merge(html_options)) end end end end