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Article ID: 173317 - Last Review: May 2, 2006 - Revision: 4.1
PRB: Active Server Pages' Request.Form and Request.QueryString Return Objects
This article was previously published under Q173317
The values that are returned by
Request.Form and
Request.QueryString are objects, rather than strings as you would expect. This causes subtle conversion problems in server-side scripts, and especially in JScript.
The following call evaluates to TRUE:
<% IsObject(Request.Form("Valid_Form_Value")) %>
This is because the
Request object returns an
IRequestDictionary object rather than a string. In most cases, this subtle fact goes unnoticed because the scripting engine simply substitutes the default value of the object into scripts as necessary. The following example demonstrates what happens when you assign the requested value to a variable:
<% MyValue = Request.QueryString("Valid_QueryString_Value") %>
However, this subtlety causes problems in some scenarios. In
particular, it may be necessary to perform explicit casts in JScript or
when calling automation methods on objects.
Another option is to use the .item syntax to extract the default value of the object. The following
IsObject call evaluates to FALSE and demonstrates use of the .item syntax:
<% IsObject (Request.QueryString("Valid_Form_Value").item) %>
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