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

@@ -1,12 +1,17 @@
 /**
  * @file
- * Javascript behaviors for Select2 integration.
+ * 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.
    *
@@ -14,13 +19,55 @@
    */
   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%')
-        .select2();
+        .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);