This is a fork from the original (and long dead) iso-3166-country-select Rails plugin to make it available as a gem and update it as necessary.
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README.md

Country-Select

Forked from https://github.com/purcell/country-select.

Provides a simple helper to get an HTML select list of countries. The list of countries comes from the ISO 3166 standard. While it is a relatively neutral source of country names, it will still offend some users.

Users are strongly advised to evaluate the suitability of this list given their user base.

Installation

Install as a gem using

gem install country-select-iso

Or put the following in your Gemfile

gem 'country-select-iso'

Using as library

Countries list

CountrySelectIso::countries

will return array of hashes with the following keys:

Key symbol Description Example
:iso2 ISO Alpha 2 country code US
:iso3 ISO Alpha 3 country code USA
:name Country name United States
:capital Capital city name Washington
:top_level_domain Top-level internet domain .us
:currency_code Currency code USD
:currency_name Currency name Dollar
:phone_code Phone number country code 1
:postal_code_format Postal code format #####-####
:postal_code_expr Postal coe Regexp ^\d{5}(-\d{4})?$
:neighbours_iso2 Array of neighboring countries ISO2 codes ['CA','MX','CU']

Country states list

CountrySelectIso::states

will return array of hashes with the following keys: US.TX Texas Texas 4736286

Key symbol Description Example
:country_iso2 2-letter ISO country code US
:state_code State code TX
:full_code [country code 2-letter code].[state code] US.TX
:localized_name Localized state name (not sure about this) Texas
:name ASCII country name Texas

Using in views

Example

    country_select("user", "country_name")
<select id="user_country" name="user[country]">
  <option value="Canada">Canada</option>
  <option value="United Kingdom">United Kingdom</option>
  <option value="United States">United States</option>
  <option value="" disabled="disabled">-------------</option>
  <option value="Afghanistan">Afghanistan</option>
  <option value="Aland Islands">Aland Islands</option>
  <option value="Albania">Albania</option>
  ...
</select>

Options

You can set the value of <option> tag to one of the following, by specifying a :value option:

Symbol Value to bo used Example
:iso2 ISO Alpha 2 US
:iso3 ISO Alpha 3 USA
:name Country name United States

You can also include an array of priority countries that will be shown first. Countries are matched by either iso3, iso2 or country name

    country_select("user", "country", value: :iso2, priority_countries: ["RU", "USA", "Albania"])
<select id="user_country" name="user[country]">
    <option value="AL">Albania</option>
    <option value="RU">Russia</option>
    <option value="US">United States</option>
    <option value="" disabled="disabled">-------------</option>
    <option value="AF">Afghanistan</option>
    <option value="AX">Aland Islands</option>
    <option value="AL">Albania</option>
    ...
</select>

States

    state_select("user", "state", value: :full_code, country: "RU", name: :localized_name)
<select id="user_state" name="user[state]">
    <option value="RU.01">Adygeya</option>
    <option value="RU.03">Altay</option>
    <option value="RU.04">Altayskiy</option>
    <option value="RU.05">Amur</option>
    <option value="RU.06">Arkhangelskaya</option>
    <option value="RU.07">Astrakhan</option>
    <option value="RU.08">Bashkortostan</option>
    <option value="RU.09">Belgorod</option>
    ...
</select>

Countries list source: http://download.geonames.org/export/dump/countryInfo.txt

States list source: http://download.geonames.org/export/dump/admin1CodesASCII.txt

Copyright (c) 2008 Michael Koziarski, 2012 Igor Shapiro released under the MIT license