Get HTML for values using CGI module

Anonymous Monk has asked for the wisdom of the Perl Monks concerning the following question:

Hi. I'm running the following code, it's not working how I want.

HTML Form:

<html>
<head>
<title>Test</title>
</head>
<body>
<form action="cgitest.pl" method="POST" enctype="application/x-www-for
+m-urlencoded">
<input type="text" id="txtInput">
<br>
<input type="submit" id="submit" value="submit">
</form>
</body>
</html>
[download]

Perl script:

#!/usr/bin/perl
use strict;
use warnings;
use CGI qw(:standard);

my $cgi = CGI->new;
my $txtInput = $cgi->param('txtInput');
warn $txtInput;
print $cgi->header();
print $cgi->start_html('Testing');
print $cgi->h1($txtInput);
print $cgi->end_html;
[download]

Apache error_log

[error] [client XX.XX.XX.XX] Use of uninitialized value in warn at cgi
+test.pl line 9., referer: http://server/form.html
[error] [client XX.XX.XX.XX] Warning: something's wrong at cgitest.pl 
+line 9., referer: http://server/form.html
[download]

How can I deal with getting form input, so that it's not posted on the query string?

Comment on Get HTML for values using CGI module Select or Download Code

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Re: Get HTML for values using CGI module by Corion (Patriarch) on Feb 21, 2010 at 18:54 UTC
While you gave your form element an `id` attribute, you didn't give it a `name` attribute, and hence it comes as a value without a name. Give it a `name="txtInput"` attribute and you'll find that your Perl code will work. Personally, I use Wireshark or the Firefox Live HTTP Headers Extension to inspect what actually gets sent to the server to check on which side the error lies.	[reply] [d/l] [select]