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.

Returns a string of option tags, like options_from_collection_for_select, but surrounds them by <optgroup> tags.

An array of group objects are passed. Each group should return an array of options when calling group_method Each group should should return its name when calling group_label_method.

html_option_groups_from_collection(@continents, "countries", "contient_name", "country_id", "country_name", @selected_country.id)

Could become:

 <optgroup label="Africa">
  <select>Egypt</select>
  <select>Rwanda</select>
  ...
 </optgroup>
 <optgroup label="Asia">
  <select>China</select>
  <select>India</select>
  <select>Japan</select>
  ...
 </optgroup>

with objects of the following classes: class Continent

  def initialize(p_name, p_countries)   @continent_name = p_name; @countries = p_countries;       end
  def continent_name() @continent_name; end
  def countries() @countries; end

end class Country

  def initialize(id, name) @id = id; @name = name end
  def country_id() @id; end
  def country_name() @name; end

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.

Examples (call, result):

  options_for_select([["Dollar", "$"], ["Kroner", "DKK"]])
    <option value="$">Dollar</option>\n<option value="DKK">Kroner</option>

  options_for_select([ "VISA", "Mastercard" ], "Mastercard")
    <option>VISA</option>\n<option selected>Mastercard</option>

  options_for_select({ "Basic" => "$20", "Plus" => "$40" }, "$40")
    <option value="$20">Basic</option>\n<option value="$40" selected>Plus</option>

Returns a string of option tags that has been compiled by iterating over the collection and assigning the the result of a call to the value_method as the option value and the text_method as the option text. If selected_value is specified, the element returning a match on value_method will get the selected option tag.

Example (call, result). Imagine a loop iterating over each person in @project.people to generate a input tag:

  options_from_collection_for_select(@project.people, "id", "name")
    <option value="#{person.id}">#{person.name}</option>