03-22-07 12:29 PM
"ATS" <ATS@discussions.microsoft.com> wrote in message
news:D0BA7279-D9BA-4FD0-91C6-C0A498D359DB@microsoft.com...
> HOWTO Make CStr for JavaScript on ASP w/ Request.Form and QueryString
>
> In ASP, Request.Form and Request.QueryString return objects that do not
> support "toString", or any JavaScript string operation on parameters not
> passed.
>
> Example: Make a TST.asp and post to it as TST.asp?STATE=TEST
>
> <%@ Language=JavaScript %>
> <%
> Response.AddHeader("Pragma", "No-Cache");
> %>
> <html>
> <%
> var csTST = Request.Form("STATE");
>
> if ((csTST == "") || (typeof(csTST) == "undefined"))
> {
> %>
> Request.Form("STATE") is NULL/Empty/Blank<br>
> <%
> }
> else
> {
> %>
> Request.Form("STATE") = "<%=csTST%>"<br>
> <%
> }
>
> csTST = Request.QueryString("STATE");
>
> if ((csTST == "") || (typeof(csTST) == "undefined"))
> {
> %>
> Request.QueryString("STATE") is NULL/Empty/Blank<br>
> <%
> }
> else
> {
> %>
> Request.QueryString("STATE") = "<%=csTST%>"<br>
> <%
> }
> %>
> </html>
>
> From this sample, the output will be as such:
>
> Request.Form("STATE") = ""
> Request.QueryString("STATE") = "REGISTER"
>
> This is WRONG. The Request.Form is blank, but yet, the test for "" and
even
> typeof failed to detect it. What I want is some kind of CStr function so
that
> the returned data is 100% turned into a string that JavaScript can work
upon.
>
> Any ideas?
>
You need to bear in mind that that both form and querystring fields can be
multivalued hence both actual return an indexable object. The objects
returned have an Item indexer property that is marked as the default
property. In VBScript whether to access this default property or not is
determined by whether the assignment is prefixed with the Set keyword. In
JScript default properties are ignored and the object reference is always
passed.
Hence in the code above it doesn't matter what name you pass to QueryString
or Form you will always get an object back. I.E. typeof(csTest) ==
'object' will always be true.
Use code like this:-
csTST = Request.QueryString("STATE").Item // note the additional explicit
use of Item.
Now with no state in the query string then typeof(csTST) == 'undefined' is
true.
With ?state= then typeof(csTST) == 'string' is true and csTST == "" is
true.
With ?state=NY then typeof(csTST) == 'string' is true and csTST == "" is
false.
Personally I would just use:-
if (csTest)
{
}
in my code.
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