Version with global json

index.html

@@ -37,6 +37,12 @@
                     });
                 });
             }
+
+            if (app.ports !== undefined && app.ports.eraseVideo !== undefined) {
+                app.ports.eraseVideo.subscribe(function() {
+                    lastId = undefined;
+                });
+            }
         </script>
     </body>
 </html>