support reconnecting and refreshing note content

Controllers/ApiController.cs

@@ -0,0 +1,17 @@
+using Microsoft.AspNetCore.Mvc;
+using BinaryDad.Notes.Services;
+
+namespace BinaryDad.Notes.Controllers
+{
+    public class ApiController : ControllerBase
+    {
+        private readonly INoteService noteService;
+
+        public ApiController(INoteService noteService)
+        {
+            this.noteService = noteService;
+        }
+
+        public string Note() => noteService.Get();
+    }
+}

wwwroot/js/site.js

@@ -53,6 +53,15 @@ $(function () {
         showToast('#update-indicator');
     });
 
+    // update content after reconnected
+    connection.onreconnected(function() {
+        $.get('api/note', function(content) {
+            $textarea.val(content);
+            showToast('#update-indicator');
+            console.log('Refreshed after disconnect');
+        });
+    });
+
     // set dark mode
     if (window.location.hash == '#dark') {
         $('body').addClass('dark');