Problem with CGI.pm generated forms

[MrNobo1024]

Here is the code:

#!perl -Tw
use CGI qw(:standard);
use strict;
my $num = param('number') || 0;
print header, start_html;
print "Your number is $num.";
print start_form;
print hidden('number', $num + 1);
print submit('Get next number');
print end_form;
print end_html;

The first time this is run, it prints "Your number is 0" and the hidden field is set to 1, as expected. But when I click on the button and it calls count.cgi?number=1, it prints "Your number is 1" but the hidden field is again set to 1! Why isn't it going to 2?

--MrNobo1024
s]]HrLfbfe|EbBibmv]e|s}w}ciZx^RYhL}e^print

[Hero Zzyzzx]

Mayhap you should check out the "-override" option? By default, form values are sticky, and you need to set them explicitly how jeffa did above, or by passing them to your method and setting "-override" to a true value.


#!/usr/bin/perl                                                       
+          
use CGI qw(:standard);
use strict;
my $num = param('number') || 0;
print header, start_html;
print "Your number is $num.";
print start_form;
print hidden(-name=>'number', -value=>$num + 1,-override=>1);
print submit('Get next number');
print end_form;
print end_html;

-Any sufficiently advanced technology is
indistinguishable from doubletalk.

[jeffa]

Very common pitfall ... you need to also set the value with the param() method:

param('number',$num + 1);
print hidden('number', $num + 1);

I can't remember why off hand though ...

UPDATE: LOL - you think i would have known that from the advice i gave at (jeffa) Re: Unstickying CGI ... Hero Zzyzzx++

jeffa

L-LL-L--L-LL-L--L-LL-L--
-R--R-RR-R--R-RR-R--R-RR
B--B--B--B--B--B--B--B--
H---H---H---H---H---H---
(the triplet paradiddle with high-hat)