file select.html.twig

{#
/**
 * @file
 * Theme override for a select element.
 *
 * Available variables:
 * - attributes: HTML attributes for the select tag.
 * - input_group: Flag to display as an input group.
 * - options: The option element children.
 * - prefix: Markup to display before the input element.
 * - suffix: Markup to display after the input element.
 *
 * @ingroup templates
 *
 * @see template_preprocess_select()
 */
#}
{% spaceless %}
  {% if input_group %}
    <div class="input-group">
  {% endif %}

  {% if prefix %}
    {{ prefix }}
  {% endif %}

  {# Browsers do not recognize pseudo :after selectors, we must create a wrapper
   # around the select element to style it properly.
   # @see http://stackoverflow.com/q/21103542
   #}
  {% if not attributes.offsetExists('multiple') %}
    <div class="select-wrapper">
  {% endif %}
    {% set classes = ['form-control'] %}
    <select{{ attributes.addClass(classes) }}>
      {% for option in options %}
        {% if option.type == 'optgroup' %}
          <optgroup label="{{ option.label }}">
            {% for sub_option in option.options %}
              <option
                value="{{ sub_option.value }}"{{ sub_option.selected ? ' selected="selected"' }}>{{ sub_option.label }}</option>
            {% endfor %}
          </optgroup>
        {% elseif option.type == 'option' %}
          <option
            value="{{ option.value }}"{{ option.selected ? ' selected="selected"' }}>{{ option.label }}</option>
        {% endif %}
      {% endfor %}
    </select>
  {% if not attributes.offsetExists('multiple') %}
    </div>
  {% endif %}

  {% if suffix %}
    {{ suffix }}
  {% endif %}

  {% if input_group %}
    </div>
  {% endif %}
{% endspaceless %}