Module: ActionView::Helpers::FormOptionsHelper

Includes:
ERB::Util
Included in:
InstanceTag
Defined in:
lib/action_view/helpers/form_options_helper.rb

Overview

Provides a number of methods for turning different kinds of containers into a set of option tags.

Options

The collection_select, country_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.find(: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.find(: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:

Constant Summary collapse

COUNTRIES =

All the countries included in the country_options output.

["Afghanistan", "Aland Islands", "Albania", "Algeria", "American Samoa", "Andorra", "Angola",
"Anguilla", "Antarctica", "Antigua And Barbuda", "Argentina", "Armenia", "Aruba", "Australia", "Austria",
"Azerbaijan", "Bahamas", "Bahrain", "Bangladesh", "Barbados", "Belarus", "Belgium", "Belize", "Benin",
"Bermuda", "Bhutan", "Bolivia", "Bosnia and Herzegowina", "Botswana", "Bouvet Island", "Brazil",
"British Indian Ocean Territory", "Brunei Darussalam", "Bulgaria", "Burkina Faso", "Burundi", "Cambodia",
"Cameroon", "Canada", "Cape Verde", "Cayman Islands", "Central African Republic", "Chad", "Chile", "China",
"Christmas Island", "Cocos (Keeling) Islands", "Colombia", "Comoros", "Congo",
"Congo, the Democratic Republic of the", "Cook Islands", "Costa Rica", "Cote d'Ivoire", "Croatia", "Cuba",
"Cyprus", "Czech Republic", "Denmark", "Djibouti", "Dominica", "Dominican Republic", "Ecuador", "Egypt",
"El Salvador", "Equatorial Guinea", "Eritrea", "Estonia", "Ethiopia", "Falkland Islands (Malvinas)",
"Faroe Islands", "Fiji", "Finland", "France", "French Guiana", "French Polynesia",
"French Southern Territories", "Gabon", "Gambia", "Georgia", "Germany", "Ghana", "Gibraltar", "Greece", "Greenland", "Grenada", "Guadeloupe", "Guam", "Guatemala", "Guernsey", "Guinea",
"Guinea-Bissau", "Guyana", "Haiti", "Heard and McDonald Islands", "Holy See (Vatican City State)",
"Honduras", "Hong Kong", "Hungary", "Iceland", "India", "Indonesia", "Iran, Islamic Republic of", "Iraq",
"Ireland", "Isle of Man", "Israel", "Italy", "Jamaica", "Japan", "Jersey", "Jordan", "Kazakhstan", "Kenya",
"Kiribati", "Korea, Democratic People's Republic of", "Korea, Republic of", "Kuwait", "Kyrgyzstan",
"Lao People's Democratic Republic", "Latvia", "Lebanon", "Lesotho", "Liberia", "Libyan Arab Jamahiriya",
"Liechtenstein", "Lithuania", "Luxembourg", "Macao", "Macedonia, The Former Yugoslav Republic Of",
"Madagascar", "Malawi", "Malaysia", "Maldives", "Mali", "Malta", "Marshall Islands", "Martinique",
"Mauritania", "Mauritius", "Mayotte", "Mexico", "Micronesia, Federated States of", "Moldova, Republic of",
"Monaco", "Mongolia", "Montenegro", "Montserrat", "Morocco", "Mozambique", "Myanmar", "Namibia", "Nauru",
"Nepal", "Netherlands", "Netherlands Antilles", "New Caledonia", "New Zealand", "Nicaragua", "Niger",
"Nigeria", "Niue", "Norfolk Island", "Northern Mariana Islands", "Norway", "Oman", "Pakistan", "Palau",
"Palestinian Territory, Occupied", "Panama", "Papua New Guinea", "Paraguay", "Peru", "Philippines",
"Pitcairn", "Poland", "Portugal", "Puerto Rico", "Qatar", "Reunion", "Romania", "Russian Federation",
"Rwanda", "Saint Barthelemy", "Saint Helena", "Saint Kitts and Nevis", "Saint Lucia",
"Saint Pierre and Miquelon", "Saint Vincent and the Grenadines", "Samoa", "San Marino",
"Sao Tome and Principe", "Saudi Arabia", "Senegal", "Serbia", "Seychelles", "Sierra Leone", "Singapore",
"Slovakia", "Slovenia", "Solomon Islands", "Somalia", "South Africa",
"South Georgia and the South Sandwich Islands", "Spain", "Sri Lanka", "Sudan", "Suriname",
"Svalbard and Jan Mayen", "Swaziland", "Sweden", "Switzerland", "Syrian Arab Republic",
"Taiwan, Province of China", "Tajikistan", "Tanzania, United Republic of", "Thailand", "Timor-Leste",
"Togo", "Tokelau", "Tonga", "Trinidad and Tobago", "Tunisia", "Turkey", "Turkmenistan",
"Turks and Caicos Islands", "Tuvalu", "Uganda", "Ukraine", "United Arab Emirates", "United Kingdom",
"United States", "United States Minor Outlying Islands", "Uruguay", "Uzbekistan", "Vanuatu", "Venezuela",
"Viet Nam", "Virgin Islands, British", "Virgin Islands, U.S.", "Wallis and Futuna", "Western Sahara",
"Yemen", "Zambia", "Zimbabwe"]

Constants included from ERB::Util

ERB::Util::HTML_ESCAPE, ERB::Util::JSON_ESCAPE

Instance Method Summary collapse 



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# File 'lib/action_view/helpers/form_options_helper.rb', line 132

def collection_select(object, method, collection, value_method, text_method, options = {}, html_options = {})
  InstanceTag.new(object, method, self, nil, options.delete(:object)).to_collection_select_tag(collection, value_method, text_method, options, html_options)
end

#country_options_for_select(selected = nil, priority_countries = nil) ⇒ Object

Returns a string of option tags for pretty much any country in the world. Supply a country name as selected to have it marked as the selected option tag. You can also supply an array of countries as priority_countries, so that they will be listed above the rest of the (long) list.

NOTE: Only the option tags are returned, you have to wrap this call in a regular HTML select tag.



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# File 'lib/action_view/helpers/form_options_helper.rb', line 279

def country_options_for_select(selected = nil, priority_countries = nil)
  country_options = ""

  if priority_countries
    country_options += options_for_select(priority_countries, selected)
    country_options += "<option value=\"\" disabled=\"disabled\">-------------</option>\n"
  end

  return country_options + options_for_select(COUNTRIES, selected)
end

#country_select(object, method, priority_countries = nil, options = {}, html_options = {}) ⇒ Object

Return select and option tags for the given object and method, using country_options_for_select to generate the list of option tags.



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# File 'lib/action_view/helpers/form_options_helper.rb', line 137

def country_select(object, method, priority_countries = nil, options = {}, html_options = {})
  InstanceTag.new(object, method, self, nil, options.delete(:object)).to_country_select_tag(priority_countries, options, html_options)
end

#option_groups_from_collection_for_select(collection, group_method, group_label_method, option_key_method, option_value_method, selected_key = nil) ⇒ Object

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.

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:

<optgroup label="Africa">
<option value="1">Egypt</option>
<option value="4">Rwanda</option>
...
</optgroup>
<optgroup label="Asia">
<option value="3" selected="selected">China</option>
<option value="12">India</option>
<option value="5">Japan</option>
...
</optgroup>

Note: Only the and tags are returned, so you still have to wrap the output in an appropriate

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.



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# File 'lib/action_view/helpers/form_options_helper.rb', line 98

def select(object, method, choices, options = {}, html_options = {})
  InstanceTag.new(object, method, self, nil, options.delete(:object)).to_select_tag(choices, options, html_options)
end

#time_zone_options_for_select(selected = nil, priority_zones = nil, model = ::ActiveSupport::TimeZone) ⇒ Object

Returns a string of option tags for pretty much any time zone in the world. Supply a TimeZone name as selected to have it marked as the selected option tag. You can also supply an array of TimeZone objects as priority_zones, so that they will be listed above the rest of the (long) list. (You can use TimeZone.us_zones as a convenience for obtaining a list of the US time zones.)

The selected parameter must be either nil, or a string that names a TimeZone.

By default, model is the 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.



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# File 'lib/action_view/helpers/form_options_helper.rb', line 307

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
    zone_options += options_for_select(convert_zones[priority_zones], selected)
    zone_options += "<option value=\"\" disabled=\"disabled\">-------------</option>\n"

    zones = zones.reject { |z| priority_zones.include?( z ) }
  end

  zone_options += options_for_select(convert_zones[zones], selected)
  zone_options
end

#time_zone_select(object, method, priority_zones = nil, options = {}, html_options = {}) ⇒ Object

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 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 TimeZone objects as priority_zones, so that they will be listed above the rest of the (long) list. (You can use TimeZone.us_zones as a convenience for obtaining a list of the US time zones.)

Finally, this method supports a :default option, which selects a default 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', TimeZone.us_zones, :default => "Pacific Time (US & Canada)")

time_zone_select( "user", 'time_zone', [ TimeZone['Alaska'], TimeZone['Hawaii'] ])

time_zone_select( "user", "time_zone", TZInfo::Timezone.all.sort, :model => TZInfo::Timezone)


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# File 'lib/action_view/helpers/form_options_helper.rb', line 168

def time_zone_select(object, method, priority_zones = nil, options = {}, html_options = {})
  InstanceTag.new(object, method, self, nil, options.delete(:object)).to_time_zone_select_tag(priority_zones, options, html_options)
end