diff --git a/menu_attributes.js b/menu_attributes.js
index 07a0c9e..59112a1 100644
--- a/menu_attributes.js
+++ b/menu_attributes.js
@@ -113,6 +113,20 @@ Drupal.behaviors.menuAttributesOptionsSummary = {
       }
     });
 
+    // Menu item onclick.
+    $('fieldset#edit-onclick', context).drupalSetSummary(function (context) {
+      if (!$('input[type="checkbox"]:checked', context).val()) {
+        return Drupal.t('Disabled');
+      }
+      var value = $('.form-textarea', context).val();
+      if (!value) {
+        return Drupal.t('No onclick');
+      }
+      else {
+        return Drupal.checkPlain(value);
+      }
+    });
+
   }
 };
 
diff --git a/menu_attributes.module b/menu_attributes.module
index dabaf3c..8153026 100644
--- a/menu_attributes.module
+++ b/menu_attributes.module
@@ -101,6 +101,14 @@ function menu_attributes_menu_attribute_info() {
     ),
     'scope' => array(MENU_ATTRIBUTES_LINK),
   );
+  $info['onclick'] = array(
+    'label' => t('Onclick'),
+    'description' => t('Enter an onclick event.'),
+    'form' => array(
+      '#type' => 'textarea',
+      '#rows' => 2,
+    ),
+  );
   return $info;
 }
 
diff --git a/menu_attributes.test b/menu_attributes.test
index 4cabdfd..0d51295 100644
--- a/menu_attributes.test
+++ b/menu_attributes.test
@@ -40,6 +40,7 @@ class MenuAttributesTestHelper extends DrupalWebTestCase {
       'style' => $this->randomName(10),
       'target' => '_top',
       'accesskey' => $this->randomName(1),
+      'onclick' => $this->randomName(10),
     );
 
     $this->menu_attributes_edit = array(
@@ -51,6 +52,7 @@ class MenuAttributesTestHelper extends DrupalWebTestCase {
       'style' => $this->randomName(10),
       'target' => '_self',
       'accesskey' => $this->randomName(1),
+      'onclick' => $this->randomName(10),
     );
   }
 
@@ -91,6 +93,7 @@ class MenuAttributesTestHelper extends DrupalWebTestCase {
       'options[attributes][style]' => $menu_attributes['style'],
       'options[attributes][target]' => $menu_attributes['target'],
       'options[attributes][accesskey]' => $menu_attributes['accesskey'],
+      'options[attributes][onclick]' => $menu_attributes['onclick'],
     );
 
     // Add menu link.
@@ -225,6 +228,7 @@ class MenuAttributesNodeTestCase extends MenuAttributesTestHelper {
       'menu[options][attributes][style]' => $this->menu_attributes_new['style'],
       'menu[options][attributes][target]' => $this->menu_attributes_new['target'],
       'menu[options][attributes][accesskey]' => $this->menu_attributes_new['accesskey'],
+      'menu[options][attributes][onclick]' => $this->menu_attributes_new['onclick'],
     );
     $this->drupalPost('node/' . $node->nid . '/edit', $edit, t('Save'));
     // Assert that the link exists.
@@ -248,6 +252,7 @@ class MenuAttributesNodeTestCase extends MenuAttributesTestHelper {
       'menu[options][attributes][style]' => $this->menu_attributes_edit['style'],
       'menu[options][attributes][target]' => $this->menu_attributes_edit['target'],
       'menu[options][attributes][accesskey]' => $this->menu_attributes_edit['accesskey'],
+      'menu[options][attributes][onclick]' => $this->menu_attributes_new['onclick'],
     );
     $this->drupalPost('node/' . $node->nid . '/edit', $edit, t('Save'));