Ticket #23875: 23875.3.diff

wp-content/themes/twentythirteen/js/functions.js

@@ -5 +5 @@
  */
 
 ( function( $ ) {
-        var html          = $( 'html' ),
-            body          = $( 'body' ),
-            navbar        = $( '#navbar' ),
-            _window       = $( window ),
-            navbarOffset  = -1,
-            toolbarOffset = body.is( '.admin-bar' ) ? 28 : 0,
+        var html               = $( 'html' ),
+            body               = $( 'body' ),
+            navbar             = $( '#navbar' ),
+            _window            = $( window ),
+            toolbarOffset      = body.is( '.admin-bar' ) ? 28 : 0,
+            navbarOffset       = navbar.offset().top - toolbarOffset,
+            scrollOffsetMethod = ( typeof window.scrollY === 'undefined' ),
+            timer              = 0,
             adjustFooter,
             adjustAnchor;
 
@@ -48 +50 @@
         /**
          * Displays the fixed navbar based on screen position.
          */
-        _window.on( 'scroll.twentythirteen', function() {
-                var scrollOffset = ( typeof window.scrollY === 'undefined' ) ? document.documentElement.scrollTop : window.scrollY;
-                if ( navbarOffset < 0 )
-                        navbarOffset = navbar.offset().top - toolbarOffset;
+        if ( _window.innerWidth() > 644 ) {
+                _window.on( 'scroll.twentythirteen', function() {
+                        if ( timer )
+                                clearTimeout( timer );
 
-                if ( scrollOffset >= navbarOffset && _window.innerWidth() > 644 )
-                        html.addClass( 'navbar-fixed' );
-                else
-                        html.removeClass( 'navbar-fixed' );
-        } );
+                        timer = setTimeout( function() {
+                                var scrollOffset = scrollOffsetMethod ? document.documentElement.scrollTop : window.scrollY;
 
+                                if ( scrollOffset > navbarOffset )
+                                        html.addClass( 'navbar-fixed' );
+                                else
+                                        html.removeClass( 'navbar-fixed' );
+                        }, 50 );
+                } );
+        }
+
         /**
          * Allows clicking the navbar to scroll to top.
          */

wp-content/themes/twentythirteen/functions.php

@@ -223 +223 @@
                 wp_enqueue_script( 'jquery-masonry' );
 
         // Loads JavaScript file with functionality specific to Twenty Thirteen.
-        wp_enqueue_script( 'twentythirteen-script', get_template_directory_uri() . '/js/functions.js', array( 'jquery' ), '20130211', true );
+        wp_enqueue_script( 'twentythirteen-script', get_template_directory_uri() . '/js/functions.js', array( 'jquery' ), '20130416', true );
 
         // Loads our main stylesheet.
         wp_enqueue_style( 'twentythirteen-style', get_stylesheet_uri() );