salve a tutti... qualcuno di voi può aiutarmi?! non riesco ad inserire un controllo nel codice che posto qui di seguito per controllare che i tre campi (username, password e email) non siano vuoti... in pratica vorrei far in modo che se uno non compila uno dei tre campi venga fuori un messaggio "ooooooooooooooooooohhhhhhhhhhh dei inserire pur qulacosa per registrarti!?!"


<%
' *** Edit Operations: declare variables

Dim MM_editAction
Dim MM_abortEdit
Dim MM_editQuery
Dim MM_editCmd

Dim MM_editConnection
Dim MM_editTable
Dim MM_editRedirectUrl
Dim MM_editColumn
Dim MM_recordId

Dim MM_fieldsStr
Dim MM_columnsStr
Dim MM_fields
Dim MM_columns
Dim MM_typeArray
Dim MM_formVal
Dim MM_delim
Dim MM_altVal
Dim MM_emptyVal
Dim MM_i

MM_editAction = CStr(Request.ServerVariables("SCRIPT_NAME"))
If (Request.QueryString <> "") Then
MM_editAction = MM_editAction & "user_exist.asp" & Request.QueryString
End If

' boolean to abort record edit
MM_abortEdit = false

' query string to execute
MM_editQuery = ""
%>
<%
' *** Redirect if username exists
MM_flag="MM_insert"
If (CStr(Request(MM_flag)) <> "") Then
MM_dupKeyRedirect="user_exist.asp"
MM_rsKeyConnection=MM_connRegistrazione_STRING
MM_dupKeyUsernameValue = CStr(Request.Form("username"))
MM_dupKeySQL="SELECT username FROM utenti WHERE username='" & MM_dupKeyUsernameValue & "'"
MM_adodbRecordset="ADODB.Recordset"
set MM_rsKey=Server.CreateObject(MM_adodbRecordset)
MM_rsKey.ActiveConnection=MM_rsKeyConnection
MM_rsKey.Source=MM_dupKeySQL
MM_rsKey.CursorType=0
MM_rsKey.CursorLocation=2
MM_rsKey.LockType=3
MM_rsKey.Open
If Not MM_rsKey.EOF Or Not MM_rsKey.BOF Then

' the username was found - can not add the requested username
MM_qsChar = "?"
If (InStr(1,MM_dupKeyRedirect,"?") >= 1) Then MM_qsChar = "&"
MM_dupKeyRedirect = MM_dupKeyRedirect & MM_qsChar & "requsername=" & MM_dupKeyUsernameValue
Response.Redirect(MM_dupKeyRedirect)
End If
MM_rsKey.Close
End If

' *** Redirect if email exists
MM_flag="MM_insert"
If (CStr(Request(MM_flag)) <> "") Then
MM_dupKeyRedirect="email_exist.asp"
MM_rsKeyConnection=MM_connRegistrazione_STRING
MM_dupKeyemailValue = CStr(Request.Form("email"))
MM_dupKeySQL="SELECT email FROM utenti WHERE email='" & MM_dupKeyemailValue & "'"
MM_adodbRecordset="ADODB.Recordset"
set MM_rsKey=Server.CreateObject(MM_adodbRecordset)
MM_rsKey.ActiveConnection=MM_rsKeyConnection
MM_rsKey.Source=MM_dupKeySQL
MM_rsKey.CursorType=0
MM_rsKey.CursorLocation=2
MM_rsKey.LockType=3
MM_rsKey.Open
If Not MM_rsKey.EOF Or Not MM_rsKey.BOF Then

' the email was found - can not add the requested email
MM_qsChar = "?"
If (InStr(1,MM_dupKeyRedirect,"?") >= 1) Then MM_qsChar = "&"
MM_dupKeyRedirect = MM_dupKeyRedirect & MM_qsChar & "reqemail=" & MM_dupKeyemailValue
Response.Redirect(MM_dupKeyRedirect)
End If
MM_rsKey.Close
End If
%>
<%
' *** Insert Record: set variables

If (CStr(Request("MM_insert")) = "form1") Then

MM_editConnection = MM_connRegistrazione_STRING
MM_editTable = "utenti"
MM_editRedirectUrl = "grazie.asp"
MM_fieldsStr= "username|value|password|value|email|value"
MM_columnsStr = "username|',none,''|password|',none,''|email|',none,''"

' create the MM_fields and MM_columns arrays
MM_fields = Split(MM_fieldsStr, "|")
MM_columns = Split(MM_columnsStr, "|")

' set the form values
For MM_i = LBound(MM_fields) To UBound(MM_fields) Step 2
MM_fields(MM_i+1) = CStr(Request.Form(MM_fields(MM_i)))
Next

' append the query string to the redirect URL
If (MM_editRedirectUrl <> "" And Request.QueryString <> "") Then
If (InStr(1, MM_editRedirectUrl, "?", vbTextCompare) = 0 And Request.QueryString <> "") Then
MM_editRedirectUrl = MM_editRedirectUrl & "?" & Request.QueryString
Else
MM_editRedirectUrl = MM_editRedirectUrl & "&" & Request.QueryString
End If
End If

End If
%>
<%
' *** Insert Record: construct a sql insert statement and execute it

Dim MM_tableValues
Dim MM_dbValues

If (CStr(Request("MM_insert")) <> "") Then

' create the sql insert statement
MM_tableValues = ""
MM_dbValues = ""
For MM_i = LBound(MM_fields) To UBound(MM_fields) Step 2
MM_formVal = MM_fields(MM_i+1)
MM_typeArray = Split(MM_columns(MM_i+1),",")
MM_delim = MM_typeArray(0)
If (MM_delim = "none") Then MM_delim = ""
MM_altVal = MM_typeArray(1)
If (MM_altVal = "none") Then MM_altVal = ""
MM_emptyVal = MM_typeArray(2)
If (MM_emptyVal = "none") Then MM_emptyVal = ""
If (MM_formVal = "") Then
MM_formVal = MM_emptyVal
Else
If (MM_altVal <> "") Then
MM_formVal = MM_altVal
ElseIf (MM_delim = "'") Then' escape quotes
MM_formVal = "'" & Replace(MM_formVal,"'","''") & "'"
Else
MM_formVal = MM_delim + MM_formVal + MM_delim
End If
End If
If (MM_i <> LBound(MM_fields)) Then
MM_tableValues = MM_tableValues & ","
MM_dbValues = MM_dbValues & ","
End If
MM_tableValues = MM_tableValues & MM_columns(MM_i)
MM_dbValues = MM_dbValues & MM_formVal
Next
MM_editQuery = "insert into " & MM_editTable & " (" & MM_tableValues & ") values (" & MM_dbValues & ")"

If (Not MM_abortEdit) Then
' execute the insert
Set MM_editCmd = Server.CreateObject("ADODB.Command")
MM_editCmd.ActiveConnection = MM_editConnection
MM_editCmd.CommandText = MM_editQuery
MM_editCmd.Execute
MM_editCmd.ActiveConnection.Close

If (MM_editRedirectUrl <> "") Then
Response.Redirect(MM_editRedirectUrl)
End If
End If

End If
%>