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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

appconfig::cgi

AppConfig::CGI(3pm)					User Contributed Perl Documentation				       AppConfig::CGI(3pm)

NAME

       AppConfig::CGI - Perl5 module for processing CGI script parameters.

SYNOPSIS

	   use AppConfig::CGI;

	   my $state = AppConfig::State->new(\%cfg);
	   my $cgi   = AppConfig::CGI->new($state);

	   $cgi->parse($cgi_query);
	   $cgi->parse();		# looks for CGI query in environment

OVERVIEW

       AppConfig::CGI is a Perl5 module which implements a CGI interface to AppConfig.	It examines the QUERY_STRING environment variable, or a
       string passed explicitly by parameter, which represents the additional parameters passed to a CGI query.  This is then used to update
       variable values in an AppConfig::State object accordingly.

       AppConfig::CGI is distributed as part of the AppConfig bundle.

DESCRIPTION

   USING THE AppConfig::CGI MODULE
       To import and use the AppConfig::CGI module the following line should appear in your Perl script:

	   use AppConfig::CGI;

       AppConfig::CGI is used automatically if you use the AppConfig module and create an AppConfig::CGI object through the cgi() method.
       AppConfig::CGI is implemented using object-oriented methods.  A new AppConfig::CGI object is created and initialised using the new()
       method.	This returns a reference to a new AppConfig::CGI object.  A reference to an AppConfig::State object should be passed in as the
       first parameter:

	   my $state = AppConfig::State->new();
	   my $cgi   = AppConfig::CGI->new($state);

       This will create and return a reference to a new AppConfig::CGI object.

   PARSING CGI QUERIES
       The "parse()" method is used to parse a CGI query which can be specified explicitly, or is automatically extracted from the "QUERY_STRING"
       CGI environment variable.  This currently limits the module to only supporting the GET method.

       See AppConfig for information about using the AppConfig::CGI module via the cgi() method.

AUTHOR

       Andy Wardley, "<abw@wardley.org<gt">

COPYRIGHT

       Copyright (C) 1997-2007 Andy Wardley.  All Rights Reserved.

       Copyright (C) 1997,1998 Canon Research Centre Europe Ltd.

       This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

SEE ALSO

       AppConfig, AppConfig::State

perl v5.12.4							    2007-05-30						       AppConfig::CGI(3pm)
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