determine if a form object exists

[JT]

is there a way to determine if a form object actually exists?

if i use the following syntax:

varTextField = Request.Form("txtFormField")

then varTextField = "" which gives the same result whether the input field
"txtFormField" doesn't exist or it does exist but it was left empty

why can't i use something like?

if Exists(Request.Form("txtFormField")) = true then
'whatever..

 

[Aaron [SQL Server MVP]]

Function formFieldExists(fieldName)
formFieldExists = (InStr(Request.Form, fieldname & "=") > 0)
End Function
Response.Write(formFieldExists("txtFormField"))

Now, this will work as long as someone doesn't pass "txtFormField=" in the
DATA for a form field with a different name.

 

[tONG]

Use IsEmpty(Request.Form("txtFormField"))