[Twisted-Python] Nevow question

[Matt Goodall]

On Sat, 2004-08-14 at 13:16 +0200, Heiko Wundram wrote:
> Hi all!
> 
> I'm currently working on a web-application with twisted and nevow, and I'm 
> using the SessionWrapper of nevow to enable logins. Well, here comes the 
> catch: When a login fails, nevow redirects to the original page, with a 
> parameter "login-failed=<somestring>", and I'd like to catch this parameter 
> (rather, check if it is there, if it is, output a different string from the 
> template). For this I have created two sections in the HTML template, both 
> using nevow:render="<somefunction>", and for one of these, I return "", and 
> for the other just context.
> 
> But, the problem remains: how can I get the POST/GET parameters (without using 
> something like Formless) that were posted to the page that is being 
> displayed?

Use "msg = context.arg('login-failed')" in your render method to get the
error message or None.

Note: context.arg is a convenience method for getting parameters from
the request. The above is equivalent to "msg = context.locate
(IRequest).args.get('login-failed',[None])[0]".

Cheers, Matt

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