Ticket #38627: 38627.1.diff

src/wp-content/themes/twentyseventeen/assets/js/customize-preview.js

@@ -102 +102 @@
                         }
                 } );
         } );
+
+        // Whether a header image is available.
+        function hasHeaderImage() {
+                var image = wp.customize( 'header_image' )();
+                return '' !== image && 'remove-header' !== image;
+        }
+
+        // Whether a header video is available.
+        function hasHeaderVideo() {
+                var externalVideo = wp.customize( 'external_header_video' )(),
+                        video = wp.customize( 'header_video' )();
+
+                return '' !== externalVideo || ( 0 !== video && '' !== video );
+        }
+
+        // Toggle a body class if a custom header exists.
+        $.each( [ 'external_header_video', 'header_image', 'header_video' ], function( index, settingId ) {
+                wp.customize( settingId, function( setting ) {
+                        setting.bind(function() {
+                                if ( hasHeaderImage() || ( hasHeaderVideo() && $( 'body' ).hasClass( 'twentyseventeen-front-page' ) ) ) {
+                                        $( document.body ).addClass( 'has-header-image' );
+                                } else {
+                                        $( document.body ).removeClass( 'has-header-image' );
+                                }
+                        } );
+                } );
+        } );
+
 } )( jQuery );