http://www.perlmonks.org?node_id=261316


in reply to Detecting a post via cgi

1. `perldoc CGI`
2. See if $ENV{QUERY_STRING} is defined or ne "".
3. 
use CGI;
use strict;
my $cgi = new CGI;
my $param1 = "";
$param1 = $cgi->param('textboxonform');
if ($param1 ne "") {
    #There was data passed from Post/Get
}

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4. If you are going to use the CGI parameters for anything...do not manually parse the QUERY_STRING. I put that option (#2 above) JIC you only want to know, "Was this script loaded from a Post/Get?"
UPDATE:
5. And if you really want to know which method of parameter passing was used...see fireartist's post above that reads, "my $method = $q->request_method();"

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Re: Re: Detecting a post via cgi
by Ovid (Cardinal) on May 28, 2003 at 15:08 UTC

    A somewhat cleaner way of doing what you accomplish:

    my $param = $cgi->param('foo') || '';
if ($param) {
   #...
}

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    Or, if you always untaint your variables:

    my $_param  = $cgi->param('foo') || '';
my ($param) = $_param =~ /^($some_regex)$/;

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    Cheers,
    Ovid

    New address of my CGI Course.
    Silence is Evil (feel free to copy and distribute widely - note copyright text)

[reply]
[d/l]
[select]
      Very true Ovid. I'm a C programmer...cut me some slack ;o). Seriously though...that's a nice space saver, and I will change my Perl methodology to reflect that 'cleaner' way of instantiation. I post some help to somebody and get help back. Yes, this is a great site.
[reply]

        No worries. I certainly didn't intend for that to come across as a rebuke. Sometimes people are a little too blunt when they post. I try not to be one of them but it looks like I was :)

        Cheers,
        Ovid

        New address of my CGI Course.
        Silence is Evil (feel free to copy and distribute widely - note copyright text)

[reply]
Re: Re: Detecting a post via cgi
by jcpunk (Friar) on May 28, 2003 at 15:11 UTC
    Thanks for the information, but I am unable to get the QUERY_STRNG to be other then "", any thoughts
    my @referers;
my $referers;
. . .
    if ($ENV{QUERY_STRING} ne "") {
        if ($ENV{'HTTP_REFERER'}) {
            foreach $referer (@referers) {
                if ($ENV{'HTTP_REFERER'} =~ m|https?://([^/]*)$referer
+|i) {
                 &begin_data_parse;
                }
            }
        }
        else { 
            print "</b>Data Passed Failed Source Check</b>";
        }
    }
    else {
            &form;
    }

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    it just keeps calling &form......
[reply]
[d/l]
      Put QUERY_STRING in quotes just as you did with HTTP_REFERER.
[reply]

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