Method: ActionView::Helpers::FormTagHelper#select_tag

Defined in:

actionview/lib/action_view/helpers/form_tag_helper.rb

#select_tag(name, option_tags = nil, options = {}) ⇒ Object

Creates a dropdown selection box, or if the :multiple option is set to true, a multiple choice selection box.

Helpers::FormOptions can be used to create common select boxes such as countries, time zones, or associated records. option_tags is a string containing the option tags for the select box.

Options

• :multiple - If set to true, the selection will allow multiple choices.

• :disabled - If set to true, the user will not be able to use this input.

• :include_blank - If set to true, an empty option will be created. If set to a string, the string will be used as the option’s content and the value will be empty.

• :prompt - Create a prompt option with blank value and the text asking user to select something.

• Any other key creates standard HTML attributes for the tag.

Examples

select_tag "people", options_from_collection_for_select(@people, "id", "name")
# <select id="people" name="people"><option value="1">David</option></select>

select_tag "people", options_from_collection_for_select(@people, "id", "name", "1")
# <select id="people" name="people"><option value="1" selected="selected">David</option></select>

select_tag "people", raw("<option>David</option>")
# => <select id="people" name="people"><option>David</option></select>

select_tag "count", raw("<option>1</option><option>2</option><option>3</option><option>4</option>")
# => <select id="count" name="count"><option>1</option><option>2</option>
#    <option>3</option><option>4</option></select>

select_tag "colors", raw("<option>Red</option><option>Green</option><option>Blue</option>"), multiple: true
# => <select id="colors" multiple="multiple" name="colors[]"><option>Red</option>
#    <option>Green</option><option>Blue</option></select>

select_tag "locations", raw("<option>Home</option><option selected='selected'>Work</option><option>Out</option>")
# => <select id="locations" name="locations"><option>Home</option><option selected='selected'>Work</option>
#    <option>Out</option></select>

select_tag "access", raw("<option>Read</option><option>Write</option>"), multiple: true, class: 'form_input', id: 'unique_id'
# => <select class="form_input" id="unique_id" multiple="multiple" name="access[]"><option>Read</option>
#    <option>Write</option></select>

select_tag "people", options_from_collection_for_select(@people, "id", "name"), include_blank: true
# => <select id="people" name="people"><option value="" label=" "></option><option value="1">David</option></select>

select_tag "people", options_from_collection_for_select(@people, "id", "name"), include_blank: "All"
# => <select id="people" name="people"><option value="">All</option><option value="1">David</option></select>

select_tag "people", options_from_collection_for_select(@people, "id", "name"), prompt: "Select something"
# => <select id="people" name="people"><option value="">Select something</option><option value="1">David</option></select>

select_tag "destination", raw("<option>NYC</option><option>Paris</option><option>Rome</option>"), disabled: true
# => <select disabled="disabled" id="destination" name="destination"><option>NYC</option>
#    <option>Paris</option><option>Rome</option></select>

select_tag "credit_card", options_for_select([ "VISA", "MasterCard" ], "MasterCard")
# => <select id="credit_card" name="credit_card"><option>VISA</option>
#    <option selected="selected">MasterCard</option></select>

# File 'actionview/lib/action_view/helpers/form_tag_helper.rb', line 201

def select_tag(name, option_tags = nil, options = {})
  option_tags ||= ""
  html_name = (options[:multiple] == true && !name.end_with?("[]")) ? "#{name}[]" : name

  if options.include?(:include_blank)
    include_blank = options[:include_blank]
    options = options.except(:include_blank)
    options_for_blank_options_tag = { value: "" }

    if include_blank == true
      include_blank = ""
      options_for_blank_options_tag[:label] = " "
    end

    if include_blank
      option_tags = content_tag("option", include_blank, options_for_blank_options_tag).safe_concat(option_tags)
    end
  end

  if prompt = options.delete(:prompt)
    option_tags = content_tag("option", prompt, value: "").safe_concat(option_tags)
  end

  content_tag "select", option_tags, { "name" => html_name, "id" => sanitize_to_id(name) }.update(options.stringify_keys)
end