From: David Alan Black <dblack@...>
Date: 2001-11-16T08:01:52+09:00
Subject: [ruby-talk:25355] Re: CGI beginner's trouble

Hello --

On Fri, 16 Nov 2001, Niklas Backlund wrote:

> require 'cgi'
>
> cgi = CGI.new("html3")
>
> cgi.out {
>   cgi.html {
>     cgi.head{ cgi.title{"Submit news..."} } +
>     cgi.body{ "\n" +
>       cgi.form{ "\n" +
>         cgi.textarea("get_text") + "\n" +
>         cgi.br +
>         cgi.submit("Submit")
>       }
>     }
>   }
> }
> if cgi["get_text"] != nil
>  print "Previous result: " + cgi["get_text"].to_s
> end
>
>
> It works as I expected to: I enter some text, hit 'Submit' and I get the
> same page again, this time with the result printed below the form (just
> for testing).

That result shouldn't actually show up, since it's after the closing
</html> tag, but I guess your browser isn't picky :-)

> But I want to save the text I entered to a text file (or whatever) and
> send back some confirmation text -- I don't want the form to appear
> again. If I try to acheive this with some test ( if cgi["get_text"] ==
> nil cgi.out{...} ) I will get stuck in the "presentation mode", because
> when trying to reload the page, I have to repost the form data, which
> will prevent me from getting the form back again... How do I make it
> "forget" my previous entry?

You should be able to branch on whether or not there's a get_text:

  require 'cgi'

  cgi = CGI.new("html3")

  cgi.out {
    if cgi["get_text"]
      cgi.html {
	cgi.head { cgi.title{"Result"} } +
	  cgi.body { "Form result: " + cgi["get_text"].to_s }
      }
    else
      cgi.html {
	cgi.head{ cgi.title{"Submit news..."} } +
	  cgi.body{ "\n" +
	    cgi.form{ "\n" +
	      cgi.textarea("get_text") + "\n" +
	      cgi.br +
	      cgi.submit("Submit")
	  }
	}
      }
    end
  }



David

-- 
David Alan Black
home: dblack@candle.superlink.net
work: blackdav@shu.edu
Web:  http://pirate.shu.edu/~blackdav