Check Existence of QueryString

[Keith]

What is the easiest way to check if a particular QueryString exists?

I want to know if the QueryString was ever passed rather than whether it
contains a value or not.

 

[McKirahan]

What is the easiest way to check if a particular QueryString exists?

I want to know if the QueryString was ever passed rather than whether it
contains a value or not.

What's the difference?

If Request.QueryString() <> "" Then {whatever}

 

[Evertjan.]

Keith wrote on 31 jan 2005 in microsoft.public.inetserver.asp.general:

What is the easiest way to check if a particular QueryString exists?

I want to know if the QueryString was ever passed rather than whether
it contains a value or not.

http://localhost/test.asp?qwerty=
and
http://localhost/test.asp?a=1&qwerty=zzz

using test.asp:

<%
response.write instr(request.querystring,"qwerty=")>0
%>

will both write:

True

=========================================

http://localhost/test.asp?qwertXy=7

will write:

False

 

[Mark Schupp]

Not to pick nits, and probably not a concern to the original poster but

test.asp?newdata=xxx
test.asp?morenewdata=yyy

would both get hits for "newdata="

If that is a possibility then a more complex condition must be checked.
Something like the following (not tested, may need tweaking)

lcase(left(request.querystring, len("newdata=")))="newdata=" Or _
instr(request.querystring,"&newdata=")>0

 

[Chris Hohmann]

What is the easiest way to check if a particular QueryString exists?

I want to know if the QueryString was ever passed rather than whether it
contains a value or not.

Response.Write IsEmpty(Request.Querystring("val"))

 

[Dave Anderson]

Response.Write IsEmpty(Request.Querystring("val"))

More to the point, Request.QueryString("val") is an *object*, and one with a
property already suitable for this task:

Request.Querystring("val").Count

The .Count property will return 0 if the parameter is not present and 1 (or
more) if present.



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Dave Anderson

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