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Full Discussion: CGI param() function parameters
Top Forums Web Development CGI param() function parameters Post 302589789 by yifangt on Thursday 12th of January 2012 02:52:40 PM
Old 01-12-2012
CGI param() function parameters
Hello again!
Three posts in this forum now, as I am trying to understand how CGI is running and the interaction of the input and output with the server/browser. Very confused with them, especially with the param() function that I was trying to figure out how the parameters of it were passed in between. Say, with the following script, I swallowed it down with little digestion, and it is working. But I do not know how to modify it for my own purpose.
I seem understanding the general idea of the cooperation among CGI, Apache2 and the Browser, but I am not sure, especially, the CGI functions in detail. In this example, I was expecting "key - value" pairs from param() function as
Code:
name      Linux
address1   123 streat
address2    Room 123
city           New York
State          NJ
zip             1X23Y4
country       USA
button         Enter

but actually nothing was printed. Can anyone explain it for me how these parameters are passed, please? Thanks a lot!

Code:
#!/usr/bin/perl -wT
#textform.pl

use strict;
use CGI;
my $q = CGI->new;

# Starters.
print $q->header, $q->start_html('Address info');

# Create a form with text entry fields.
print $q->start_form,
    $q->h1('Please enter your address below.'),$q->p,
    'Name:',$q->textfield(-name => 'name'),$q->br,
    'Address:',$q->textfield(-name => 'address1'),$q->br,
    'Address:',$q->textfield(-name => 'address2'),$q->br,
    'City:',$q->textfield(-name => 'city'),
    'State/Province:',$q->textfield(-name => 'state'),
    'Zip/Postal code:',$q->textfield(-name => 'zip'),$q->br,
    'Country:',$q->textfield(-name => 'country'),$q->p,
    $q->submit('button','Enter'),
    $q->end_form;
print "The parameters of the CGI object (\$q) are: ", "\n";
foreach my $member ($q->param()) {     #Line 24
print "$member\t";                                   #Line 25
}                                                            #Line 26
print "\n";
# End the document.
print $q->end_html;

 

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LEARN ABOUT DEBIAN

cgi::xml

XML(3pm)						User Contributed Perl Documentation						  XML(3pm)

NAME

       CGI::XML - Perl extension for converting CGI.pm variables to/from XML

SYNOPSIS

	 use CGI::XML;
	 $q = new CGI::XML;

	 # convert CGI.pm variables to XML
	 $xml = $q->toXML;
	 $xml = $q->toXML($root);

	 # convert XML to CGI.pm variables
	 $q->toCGI($xml);

DESCRIPTION

       The CGI::XML module converts CGI.pm variables to XML and vice versa.

       CGI::XML is a subclass of CGI.pm, so it reads the CGI variables just as CGI.pm would.

METHODS

       $q = new CGI::XML
	   creates a new instance of CGI::XML. You also have access to all of the methods in CGI.pm.

       $q->toXML([$root])
	   where $root is an optional parameter that specifies the root element. By default, toXML will not return a root element.

       $q->toCGI($xml)
	   where $xml is the XML you would like to convert to CGI.pm parameters. Values in the XML will overwrite any existing values if they
	   exist.

NOTE

       CGI::XML does not currently handle multiple selections passed from HTML forms. This will be added in a future release.

AUTHOR

       Jonathan Eisenzopf <eisen@pobox.com>

CONTRIBUTORS

       David Black <dblack@candle.superlink.net>

SEE ALSO

       perl(1), XML::Parser(3).

perl v5.8.8							    2004-12-05								  XML(3pm)
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