v1/web/modules/contrib/lang_dropdown/js/lang_dropdown.js

(function ($, drupalSettings) {
  'use strict';

  Drupal.behaviors.lang_dropdown = {
    attach: function (context, settings) {
      settings = settings || drupalSettings;

      if (settings.lang_dropdown) {
        $('select.lang-dropdown-select-element').each(function() {
          var $dropdown = $(this);
          var key = $dropdown.data('lang-dropdown-id');

          var ldSettings = settings.lang_dropdown[key];
          if (ldSettings) {
            var flags = ldSettings.languageicons;
            if (flags) {
              $.each(flags, function (index, value) {
                var option = $dropdown.find('option[value="' + index + '"]');
                if (ldSettings.widget === 'msdropdown') {
                  option.attr('data-image', value);
                }
                else if (ldSettings.widget === 'ddslick' && Boolean(ldSettings.showSelectedHTML)) {
                  option.attr('data-imagesrc', value);
                }
              });
            }
            if (ldSettings.widget === 'msdropdown') {
              try {
                $dropdown.msDropDown({
                  visibleRows: ldSettings.visibleRows,
                  roundedCorner: Boolean(ldSettings.roundedCorner),
                  animStyle: ldSettings.animStyle,
                  event: ldSettings.event,
                  mainCSS: ldSettings.mainCSS
                });
              }
              catch (e) {
                if (console) {
                  console.log(e);
                }
              }
            }
            else if (ldSettings.widget === 'chosen') {
              $dropdown.chosen({
                disable_search: ldSettings.disable_search,
                no_results_text: ldSettings.no_results_text
              });
            }
            else if (ldSettings.widget === 'ddslick') {
              $.data(document.body, 'ddslick' + key + 'flag', 0);
              $dropdown.ddslick({
                width: ldSettings.width,
                height: (ldSettings.height === 0) ? null : ldSettings.height,
                showSelectedHTML: Boolean(ldSettings.showSelectedHTML),
                imagePosition: ldSettings.imagePosition,
                onSelected: function (data, element) {
                  var i = jQuery.data(document.body, 'ddslick' + key + 'flag');
                  if (i) {
                    $.data(document.body, 'ddslick' + key + 'flag', 0);
                    data.selectedItem.closest('form').submit()
                  }
                  $.data(document.body, 'ddslick' + key + 'flag', 1);
                }
              });
            }
          }
        });
      }

      $('select.lang-dropdown-select-element').change(function () {
        $(this).closest('form').submit();
      });
    }
  };
})(jQuery, drupalSettings);