diff --git a/src/wp-content/themes/twentyfifteen/js/functions.js b/src/wp-content/themes/twentyfifteen/js/functions.js
index eeeecd2246..64a696860d 100644
--- a/src/wp-content/themes/twentyfifteen/js/functions.js
+++ b/src/wp-content/themes/twentyfifteen/js/functions.js
@@ -9,23 +9,28 @@
var $body, $window, $sidebar, adminbarOffset, top = false,
bottom = false, windowWidth, windowHeight, lastWindowPos = 0,
topOffset = 0, bodyHeight, sidebarHeight, resizeTimer,
- secondary, button;
+ secondary, button;
- // Add dropdown toggle that display child menu items.
- $( '.main-navigation .menu-item-has-children > a' ).after( '' );
- // Toggle buttons and submenu items with active children menu items.
- $( '.main-navigation .current-menu-ancestor > button' ).addClass( 'toggle-on' );
- $( '.main-navigation .current-menu-ancestor > .sub-menu' ).addClass( 'toggled-on' );
+ function initMainNavigation() {
+ // Add dropdown toggle that display child menu items.
+ $( '.main-navigation .menu-item-has-children > a' ).after( '' );
- $( '.dropdown-toggle' ).click( function( e ) {
- var _this = $( this );
- e.preventDefault();
- _this.toggleClass( 'toggle-on' );
- _this.next( '.children, .sub-menu' ).toggleClass( 'toggled-on' );
- _this.attr( 'aria-expanded', _this.attr( 'aria-expanded' ) === 'false' ? 'true' : 'false' );
- _this.html( _this.html() === screenReaderText.expand ? screenReaderText.collapse : screenReaderText.expand );
- } );
+ // Toggle buttons and submenu items with active children menu items.
+ $( '.main-navigation .current-menu-ancestor > button' ).addClass( 'toggle-on' );
+ $( '.main-navigation .current-menu-ancestor > .sub-menu' ).addClass( 'toggled-on' );
+
+ $( '.dropdown-toggle' ).click( function( e ) {
+ var _this = $( this );
+ e.preventDefault();
+ _this.toggleClass( 'toggle-on' );
+ _this.next( '.children, .sub-menu' ).toggleClass( 'toggled-on' );
+ _this.attr( 'aria-expanded', _this.attr( 'aria-expanded' ) === 'false' ? 'true' : 'false' );
+ _this.html( _this.html() === screenReaderText.expand ? screenReaderText.collapse : screenReaderText.expand );
+ } );
+ }
+ initMainNavigation();
+ $( document ).on( 'customize-preview-menu-refreshed', initMainNavigation );
secondary = $( '#secondary' );
button = $( '.site-branding' ).find( '.secondary-toggle' );