1 files changed, 45 insertions, 2 deletions
diff --git a/misc/vertical-tabs.js b/misc/vertical-tabs.js
index ba43c8f88..127df5420 100644
--- a/misc/vertical-tabs.js
+++ b/misc/vertical-tabs.js
@@ -80,7 +80,9 @@ Drupal.verticalTab = function (settings) {
 };
 
 Drupal.verticalTab.prototype = {
-  // Displays the tab's content pane.
+  /**
+   * Displays the tab's content pane.
+   */
   focus: function () {
     this.fieldset
       .siblings('fieldset.vertical-tabs-pane')
@@ -96,9 +98,50 @@ Drupal.verticalTab.prototype = {
     this.item.addClass('selected');
   },
 
-  // Updates the tab's summary.
+  /**
+   * Updates the tab's summary.
+   */
   updateSummary: function () {
     this.summary.html(this.fieldset.getSummary());
+  },
+
+  /**
+   * Shows a vertical tab pane.
+   */
+  tabShow: function () {
+    // Display the tab.
+    this.item.show();
+    // Update .first marker for items. We need recurse from parent to retain the
+    // actual DOM element order as jQuery implements sortOrder, but not as public
+    // method.
+    this.item.parent().children('.vertical-tab-button').removeClass('first')
+      .filter(':visible:first').addClass('first');
+    // Display the fieldset.
+    this.fieldset.removeClass('vertical-tab-hidden').show();
+    // Focus this tab.
+    this.focus();
+    return this;
+  },
+
+  /**
+   * Hides a vertical tab pane.
+   */
+  tabHide: function () {
+    // Hide this tab.
+    this.item.hide();
+    // Update .first marker for items. We need recurse from parent to retain the
+    // actual DOM element order as jQuery implements sortOrder, but not as public
+    // method.
+    this.item.parent().children('.vertical-tab-button').removeClass('first')
+      .filter(':visible:first').addClass('first');
+    // Hide the fieldset.
+    this.fieldset.addClass('vertical-tab-hidden').hide();
+    // Focus the first visible tab (if there is one).
+    var $firstTab = this.fieldset.siblings('.vertical-tabs-pane:not(.vertical-tab-hidden):first');
+    if ($firstTab.length) {
+      $firstTab.data('verticalTab').focus();
+    }
+    return this;
   }
 };