[thelist] does JavaScript have an equivalent to IsDefined()?

[jsWalter]

> -----Original Message-----
> From: thelist-bounces at lists.evolt.org
> [mailto:thelist-bounces at lists.evolt.org]On Behalf Of Sarah
> Sent: Monday, September 22, 2003 2:52 PM
> To: Evolt - thelist
> Subject: [thelist] does JavaScript have an equivalent to IsDefined()?
>
>
> More ASP/JavaScript woes :) Is there a JavaScript equivalent to the
> ColdFusion IsDefined() function? I would like to be able to test
> to see if
> a variable is defined in the querystring, but none of the methods I have
> tried has worked. I have tried:
> if (Request.QueryString('id') == null) //...
> if (Request.QueryString('id') == undefined) //...
> if (Request.QueryString('id') == 'undefined') //...
> if (typeof Request.QueryString('id') == undefined) //...
> if (typeof Request.QueryString('id') == 'undefined') //...

I pulled this from my snippets file...

   if ( typeof ( myVar ) != "undefined" )


It is similar to your last 2 examples, but the TYPEOF is a method call, thus
needing the parens.

Don't know if it will work for Request.QueryString?

I'd like to know if it does work.

Hope this helps a little.

Walter