Back tothe previousway of globals

templates/feedbackform.html

@@ -73,6 +73,7 @@
 <script type="text/javascript">
     var call = JSON.parse('{{ @call | raw }}');
     var call_url = call['data']['url'];
+    var interval = None;
     function normalize_phone(phone) {
         if (phone.startsWith('+')) {
             return phone.replace('+', '00');
@@ -161,6 +162,6 @@
     };
     $(document).ready(function() {
         update_call(call);
-        var window.interval = window.setInterval(fetch, 3000);
+        interval = window.setInterval(fetch, 3000);
     });
 </script>