Ticket #41535: 41535.patch

src/wp-admin/js/common.js

@@ -90 +90 @@
 showNotice = {
         warn : function() {
                 var msg = commonL10n.warnDelete || '';
-                if ( confirm(msg) ) {
+                if ( confirm( msg ) ) {
                         return true;
                 }
 
                 return false;
         },
 
+    warnOffline : function() {
+        var msg = commonL10n.warnOffline || '';
+        if ( navigator.onLine !== true ){
+            return confirm( msg );
+        }
+
+        // If navigator.onLine returns true or it isn't supported by the current browser, proceed
+        return true;
+    },
+
         note : function(text) {
                 alert(text);
         }

src/wp-admin/js/inline-edit-post.js

@@ -391 +391 @@
          *                       Enter on a focused field.
          */
         save : function(id) {
+
+        if ( ! showNotice.warnOffline() ){
+            return false;
+        }
+
                 var params, fields, page = $('.post_status_page').val() || '';
 
                 if ( typeof(id) === 'object' ) {

src/wp-admin/js/nav-menu.js

@@ -844 +844 @@
                          * When a navigation menu is saved, store a JSON representation of all form data
                          * in a single input to avoid PHP `max_input_vars` limitations. See #14134.
                          */
-                        $( '#update-nav-menu' ).submit( function() {
+                        $( '#update-nav-menu' ).submit( function( event ) {
+
+                            if ( ! showNotice.warnOffline() ){
+                    event.preventDefault();
+                    return;
+                }
+
                                 var navMenuData = $( '#update-nav-menu' ).serializeArray();
                                 $( '[name="nav-menu-data"]' ).val( JSON.stringify( navMenuData ) );
                         });

src/wp-admin/js/post.js

@@ -884 +884 @@
                         event.preventDefault();
                 });
 
-                // Cancel submit when an invalid timestamp has been selected.
                 $('#post').on( 'submit', function( event ) {
+
+                    var $publishingActionSpinner = $( '#publishing-action .spinner' );
+
+            if ( ! showNotice.warnOffline() ){
+                $publishingActionSpinner.removeClass( 'is-active' );
+                event.preventDefault();
+                return;
+            }
+
+            // Cancel submit when an invalid timestamp has been selected.
                         if ( ! updateText() ) {
                                 event.preventDefault();
                                 $timestampdiv.show();
@@ -894 +903 @@
                                         wp.autosave.enableButtons();
                                 }
 
-                                $( '#publishing-action .spinner' ).removeClass( 'is-active' );
+                $publishingActionSpinner.removeClass( 'is-active' );
                         }
                 });
 

src/wp-includes/script-loader.php

@@ -78 +78 @@
         $scripts->add( 'common', "/wp-admin/js/common$suffix.js", array('jquery', 'hoverIntent', 'utils'), false, 1 );
         did_action( 'init' ) && $scripts->localize( 'common', 'commonL10n', array(
                 'warnDelete'   => __( "You are about to permanently delete these items from your site.\nThis action cannot be undone.\n 'Cancel' to stop, 'OK' to delete." ),
+                'warnOffline'  => __( 'You are offline at the current moment. Are you sure you want to proceed?' ),
                 'dismiss'      => __( 'Dismiss this notice.' ),
                 'collapseMenu' => __( 'Collapse Main menu' ),
                 'expandMenu'   => __( 'Expand Main menu' ),