#!/usr/bin/perl -w use strict; use CGI::Ajax; use CGI; # define an anonymous perl subroutine that you want available to # javascript on the generated web page. my $evenodd_func = sub { my $input = shift; my $magic = "      look ma, no submit!
"; # see if input is defined if ( not defined $input ) { return("input not defined or NaN" . $magic); } # see if value is a number (*thanks Randall!*) if ( $input !~ /\A\d+\z/ ) { return("input is NaN" . $magic); } # got a number, so mod by 2 $input % 2 == 0 ? return("$input is EVEN" . $magic) : return("$input is ODD" . $magic); }; # don't forget the trailing ';', since this is an anon subroutine # define a function to generate the web page - this can be done # million different ways, and can also be defined as an anonymous sub. # The only requirement is that the sub send back the html of the page. sub Show_HTML { my $html = ""; $html .= < CGI::Ajax Example
Enter a number: 
EOT return $html; } my $cgi = new CGI(); # create a new CGI object # now we create a CGI::Ajax object, and associate our anon code my $pjx = new CGI::Ajax( 'evenodd' => $evenodd_func ); # now print the page. This can be done easily using # CGI::Ajax->build_html, sending in the CGI object to generate the html # header. This could also be done manually, and then you don't need # the build_html() method print $pjx->build_html($cgi,\&Show_HTML); # this outputs the html for the page # that's it!