--- /dev/null
+<?php
+/**
+ * Customize API: WP_Customize_Nav_Menu_Section class
+ *
+ * @package WordPress
+ * @subpackage Customize
+ * @since 4.4.0
+ */
+
+/**
+ * Customize Menu Section Class
+ *
+ * Custom section only needed in JS.
+ *
+ * @since 4.3.0
+ *
+ * @see WP_Customize_Section
+ */
+class WP_Customize_Nav_Menu_Section extends WP_Customize_Section {
+
+ /**
+ * Control type.
+ *
+ * @since 4.3.0
+ * @access public
+ * @var string
+ */
+ public $type = 'nav_menu';
+
+ /**
+ * Get section parameters for JS.
+ *
+ * @since 4.3.0
+ * @access public
+ * @return array Exported parameters.
+ */
+ public function json() {
+ $exported = parent::json();
+ $exported['menu_id'] = intval( preg_replace( '/^nav_menu\[(\d+)\]/', '$1', $this->id ) );
+
+ return $exported;
+ }
+}