instance method `grouped_options_for_select`

Ruby on Rails 3.0.20

Since v2.3.18

Available in: v2.3.18 v3.0.20 v3.1.12 v3.2.22.5 v4.0.13 v4.1.16 v4.2.9 v5.2.8.1 v6.0.6 v6.1.7.10 v7.0.10 v7.1.6 v7.2.3 v8.0.4 v8.1.2

Compare with:

grouped_options_for_select(grouped_options, selected_key = nil, prompt = nil)

Returns a string of <option> tags, like options_for_select, but wraps them with <optgroup> tags.

Parameters:

grouped_options - Accepts a nested array or hash of strings. The first value serves as the <optgroup> label while the second value must be an array of options. The second value can be a nested array of text-value pairs. See options_for_select for more info.
```
Ex. ["North America",[["United States","US"],["Canada","CA"]]]
```
selected_key - A value equal to the value attribute for one of the <option> tags, which will have the selected attribute set. Note: It is possible for this value to match multiple options as you might have the same option in multiple groups. Each will then get selected="selected".
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.

Sample usage (Array):

grouped_options = [
 ['North America',
   [['United States','US'],'Canada']],
 ['Europe',
   ['Denmark','Germany','France']]
]
grouped_options_for_select(grouped_options)

Sample usage (Hash):

grouped_options = {
 'North America' => [['United States','US], 'Canada'],
 'Europe' => ['Denmark','Germany','France']
}
grouped_options_for_select(grouped_options)

Possible output:

<optgroup label="Europe">
  <option value="Denmark">Denmark</option>
  <option value="Germany">Germany</option>
  <option value="France">France</option>
</optgroup>
<optgroup label="North America">
  <option value="US">United States</option>
  <option value="Canada">Canada</option>
</optgroup>

Note: Only the <optgroup> and <option> tags are returned, so you still have to wrap the output in an appropriate <select> tag.

Parameters

grouped_options req
selected_key opt = nil
prompt opt = nil

Source

# File actionpack/lib/action_view/helpers/form_options_helper.rb, line 449
      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

Defined in actionpack/lib/action_view/helpers/form_options_helper.rb line 449 · View on GitHub · Improve this page · Find usages on GitHub

Defined in ActionView::Helpers::FormOptionsHelper

Signature

Parameters