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asp_web_howto thread: problem validating form fields
Message #1 by "Kelvin" <kelvinteh@h...> on Wed, 28 Mar 2001 17:18:22
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hi,
i have this problem in validating form fields. How do i check whether the
passed in form field exist? for e.g. In my action page, i request for the
form field named "handphoneNum".
request.form("handphoneNum")
i tried using these methods to check whether this form field exist, but
they could not work.
if request.form("handphoneNum") = null then
...
end if
if request.form("handphoneNum") = empty then
...
end if
if request.form("handphoneNum") = nothing then
...
end if
i'm stuck with this problem.
can someone help me in this problem?
Your help will be much appreciated.
thank you.
Message #2 by "Peter Lanoie" <planoie@e...> on Wed, 28 Mar 2001 12:12:48 -0500
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The only way I can think of testing it is to see if the field is blank
(=""). If you are expecting there to be a value, then you could be pretty
sure that if it's blank, it's not there. Combine with some JavaScript
validation to ensure that the form isn't submitted with that field blank if
it exists.
I can give you further information on checking to see if it exists in
JavaScript if you so desire. That I know can be done.
HTH,
Peter
-----Original Message-----
From: Kelvin [mailto:kelvinteh@h...]
Sent: Wednesday, March 28, 2001 12:18 PM
To: ASP Web HowTo
Subject: [asp_web_howto] problem validating form fields
hi,
i have this problem in validating form fields. How do i check whether the
passed in form field exist? for e.g. In my action page, i request for the
form field named "handphoneNum".
request.form("handphoneNum")
i tried using these methods to check whether this form field exist, but
they could not work.
if request.form("handphoneNum") = null then
...
end if
if request.form("handphoneNum") = empty then
...
end if
if request.form("handphoneNum") = nothing then
...
end if
i'm stuck with this problem.
can someone help me in this problem?
Your help will be much appreciated.
thank you.
Message #3 by "Wally Burfine" <oopconsultant@h...> on Wed, 28 Mar 2001 18:42:45 -0000
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Kelvin,
You are close, use:
if isempty(request.form("handphoneNum")) then
...
regards, Wally
>From: "Kelvin" <kelvinteh@h...>
>Reply-To: "ASP Web HowTo" <asp_web_howto@p...>
>To: "ASP Web HowTo" <asp_web_howto@p...>
>Subject: [asp_web_howto] problem validating form fields
>Date: Wed, 28 Mar 2001 17:18:22
>
>hi,
>
>i have this problem in validating form fields. How do i check whether the
>passed in form field exist? for e.g. In my action page, i request for the
>form field named "handphoneNum".
>
>request.form("handphoneNum")
>
>i tried using these methods to check whether this form field exist, but
>they could not work.
>
>if request.form("handphoneNum") = null then
>...
>end if
>
>if request.form("handphoneNum") = empty then
>...
>end if
>
>if request.form("handphoneNum") = nothing then
>...
>end if
>
>
>i'm stuck with this problem.
>can someone help me in this problem?
>Your help will be much appreciated.
>
>thank you.
>
>
Message #4 by "Ken Schaefer" <ken@a...> on Fri, 30 Mar 2001 13:29:25 +1000
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
: i have this problem in validating form fields. How do i check whether the
: passed in form field exist? for e.g. In my action page, i request for the
: form field named "handphoneNum".
:
: request.form("handphoneNum")
:
: i tried using these methods to check whether this form field exist, but
: they could not work.
:
: if request.form("handphoneNum") = null then
: ...
: end if
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
It's not working, because they aren't equal to NULL. Nothing is equal to
NULL, not even another NULL. OK?
<%
If Request.Form("field1") & "" = "" then
' empty
Else
' something there
End if
%>
The & "" forces an implicit conversion of any NULLs to string.
Cheers
Ken
Message #5 by "Alex Shiell, ITS, EC, SE" <alex.shiell@s...> on Fri, 30 Mar 2001 10:43:08 +0100
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isempty is the same as ="" (empty string)
what he wants is
if isnull(request.form("handphoneNum")) then
but it really depends on what the database is returning, nulls or empty
strings?
to be safe do
if isnull(request.form("handphoneNum")) or
isempty(request.form("handphoneNum")) then
-----Original Message-----
From: Wally Burfine [mailto:oopconsultant@h...]
Sent: Wednesday, March 28, 2001 7:43 PM
To: ASP Web HowTo
Subject: [asp_web_howto] Re: problem validating form fields
Kelvin,
You are close, use:
if isempty(request.form("handphoneNum")) then
...
regards, Wally
>From: "Kelvin" <kelvinteh@h...>
>Reply-To: "ASP Web HowTo" <asp_web_howto@p...>
>To: "ASP Web HowTo" <asp_web_howto@p...>
>Subject: [asp_web_howto] problem validating form fields
>Date: Wed, 28 Mar 2001 17:18:22
>
>hi,
>
>i have this problem in validating form fields. How do i check whether the
>passed in form field exist? for e.g. In my action page, i request for the
>form field named "handphoneNum".
>
>request.form("handphoneNum")
>
>i tried using these methods to check whether this form field exist, but
>they could not work.
>
>if request.form("handphoneNum") = null then
>...
>end if
>
>if request.form("handphoneNum") = empty then
>...
>end if
>
>if request.form("handphoneNum") = nothing then
>...
>end if
>
>
>i'm stuck with this problem.
>can someone help me in this problem?
>Your help will be much appreciated.
>
>thank you.
>
________________________________________________________________________
Scottish Enterprise Network
http://www.scottish-enterprise.com
Message #6 by "Drew, Ron" <RDrew@B...> on Fri, 30 Mar 2001 10:46:34 -0500
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This message is in MIME format. Since your mail reader does not understand
this format, some or all of this message may not be legible.
------_=_NextPart_001_01C0B930.993D3CF0
Content-Type: text/plain
On the page with the form, add the following Javascript in the HEAD
<script language="JavaScript">
<!-- for old browsers
function CheckForm() {
if (document.myform.handphoneNum.value == "")
{
alert("Please enter a value for Hand Phone Number.");
document.myform.handphoneNum.focus();
return (false);
}
return (true);
}
//-->
</script>
Then add the onSubmit in the BODY
<FORM onSubmit="return CheckForm()" METHOD="POST" ACTION="some.asp"
NAME=myform>
Ron
-----Original Message-----
From: Kelvin [mailto:kelvinteh@h...]
Sent: Wednesday, March 28, 2001 12:18 PM
To: ASP Web HowTo
Subject: [asp_web_howto] problem validating form fields
hi,
i have this problem in validating form fields. How do i check whether the
passed in form field exist? for e.g. In my action page, i request for the
form field named "handphoneNum".
request.form("handphoneNum")
i tried using these methods to check whether this form field exist, but
they could not work.
if request.form("handphoneNum") = null then
...
end if
if request.form("handphoneNum") = empty then
...
end if
if request.form("handphoneNum") = nothing then
...
end if
i'm stuck with this problem.
can someone help me in this problem?
Your help will be much appreciated.
thank you.
---
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