From: Brian Candler <b.candler@...>
Date: 2008-10-23T19:25:00+09:00
Subject: Re: using buttons in CGI

Asaf Asaf wrote:
> I read on the 'programming Ruby' that the submit button will update the 
> name of the fprm that appear on the form parameters :
> for ex. @cgi.form("get","abcdc.rb")
> will update the abcdc.rb form and will show this form, with no option 
> for me to change it.

But first you need to look at what cgi.params contains; the 
documentation for @cgi.submit, and look at what HTML it creates; and at 
the w3 documentation for <input type="submit">, which explicitly states 
that a form can have multiple submit buttons with different values.

I find it's always wise not to trust my understanding of what I've read 
until I've demonstrated for myself whether it works in the way I thought 
it did.

> so can you please explain to me how can I get the data back and how can 
> I handle it.

Here is a fully-working example.

#!/usr/local/bin/ruby -w

require 'cgi'

def show_form(cgi, rows)
  cgi.form do
    content = ""
    # content << cgi.params.inspect
    rows.each do |row|
      content << cgi.text_field("row", row)
      content << cgi.br
    end
    content << cgi.submit("new row", "submit")
    content << cgi.br
    content << cgi.submit("go", "submit")
    content
  end
end

cgi = CGI.new("html4")
rows = cgi.params["row"]

case cgi.params["submit"].first
when "go"
  cgi.out do
    CGI.escapeHTML("You submitted #{rows.inspect}")
  end

when "new row"
  cgi.out do
    show_form(cgi, rows + [""])
  end

else
  cgi.out do
    show_form(cgi, rows)
  end
end
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