drupalcampbristol/web/modules/contrib/webform/js/webform.element.select2.js

/**
 * @file
 * JavaScript behaviors for Select2 integration.
 */

(function ($, Drupal) {

  'use strict';

  // @see https://select2.github.io/options.html
  Drupal.webform = Drupal.webform || {};
  Drupal.webform.select2 = Drupal.webform.select2 || {};
  Drupal.webform.select2.options = Drupal.webform.select2.options || {};

  /**
   * Initialize Select2 support.
   *
   * @type {Drupal~behavior}
   */
  Drupal.behaviors.webformSelect2 = {
    attach: function (context) {
      if (!$.fn.select2) {
        return;
      }

      $(context)
        .find('select.js-webform-select2, .js-webform-select2 select')
        .once('webform-select2')
        // http://stackoverflow.com/questions/14313001/select2-not-calculating-resolved-width-correctly-if-select-is-hidden
        .css('width', '100%')
        .each(function () {
          var $select = $(this);

          var options = $.extend({}, Drupal.webform.select2.options);
          if ($select.data('placeholder')) {
            options.placeholder = $select.data('placeholder');
            if (!$select.prop('multiple')) {
              // Allow single option to be deselected.
              options.allowClear = true;
            }
          }

          $select.select2(options);
        });

    }
  };

  /**
   * ISSUE:
   * Hiding/showing element via #states API cause select2 dropdown to appear in the wrong position.
   *
   * WORKAROUND:
   * Close (aka hide) select2 dropdown when #states API hides or shows an element.
   *
   * Steps to reproduce:
   * - Add custom 'Submit button(s)'
   * - Hide submit button
   * - Save
   * - Open 'Submit button(s)' dialog
   *
   * Dropdown body is positioned incorrectly when dropdownParent isn't statically positioned.
   * @see https://github.com/select2/select2/issues/3303
   */
  $(function () {
    if ($.fn.select2) {
      $(document).on('state:visible state:visible-slide', function (e) {
        $('select.select2-hidden-accessible').select2('close');
      });
    }
  });

})(jQuery, Drupal);