Reactjs: тег br и запрос ajax

Public Function WorkSheetExists(ByVal strName As String) As Boolean
   On Error Resume Next
   WorkSheetExists = Not Worksheets(strName) Is Nothing
End Function

sub test_sheet()

 If Not WorkSheetExists("SheetName") Then
 MsgBox "Not available"
Else MsgBox "Available"
End If

End Sub