fix: added spinner for exam publish btn

Fixes #1085

resources/views/training/exam/create.blade.php

@@ -155,7 +155,9 @@ class="form-control"
                             </div>
                         </div>
 
-                        <button type="submit" id="training-submit-btn" class="btn btn-success mt-3">Publish examination report</button>
+                        <button type="submit" id="exam-submit-btn" class="btn btn-success mt-3" onclick="handleSubmit(event)">Publish examination report
+                            <div class="submit-spinner spinner-border spinner-border-sm" role="status" style="display: none;">&nbsp;</div>
+                        </button>
                     </form>
                 </div>
             </div>
@@ -187,6 +189,13 @@ class="form-control"
         var defaultDate = "{{ old('date') }}"
         document.querySelector('.datepicker').flatpickr({ disableMobile: true, minDate: "{!! date('Y-m-d', strtotime('-1 months')) !!}", maxDate: "{!! date('Y-m-d') !!}", dateFormat: "d/m/Y", defaultDate: defaultDate, locale: {firstDayOfWeek: 1 } });
     })
+
+    function handleSubmit(event) {
+        event.preventDefault();
+        document.querySelector('.submit-spinner').style.display = 'inherit';
+        event.target.disabled = true;
+        event.target.closest('form').submit();
+    }
 </script>
 
 @endsection