Alexander Becker > CGI-Application-Plugin-HTCompiled > CGI::Application::Plugin::HTCompiled



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CGI::Application::Plugin::HTCompiled - Integrate with HTML::Template::Compiled


    # In your CGI::Application-derived base class. . . 
    use base "CGI::Application";
    use CGI::Application::Plugin::HTCompiled;

    # Later, in a run mode far, far away. . . 
    sub view
        my $self = shift;
        my $username = $self->query->param("user");
        my $user     = My::Users->retrieve($username);

        my $tmpl_view = $self->load_tmpl( "view_user.tmpl" );

        $tmpl_view->param( user => $user );

        return $tmpl_view->output();


Allows you to use HTML::Template::Compiled as a seamless replacement for HTML::Template.


By default, the HTCompiled plugin will automatically add a parameter 'c' to the template that will return to your CGI::Application object $self. This allows you to access any methods in your CGI::Application module that you could normally call on $self from within your template. This allows for some powerful actions in your templates. For example, your templates will be able to access query parameters, or if you use the CGI::Application::Plugin::Session module, you can access session parameters.

 <a href="<tmpl_var c.query.self_url>">Reload this page</a>

With this extra flexibility comes some responsibilty as well. It could lead down a dangerous path if you start making alterations to your object from within the template. For example you could call c.header_add to add new outgoing headers, but that is something that should be left in your code, not in your template. Try to limit yourself to pulling in information into your templates (like the session example above does).

Extending load_tmpl()

There are times when the basic load_tmpl() functionality just isn't enough. The easiest way to do this is by replacing or extending the functionality of CGI::Application's load_tmpl() method. This is still possible using the plugin.

The following code snippet illustrates one possible way of achieving this:

  sub load_tmpl
      my ($self, $tmpl_file, @extra_params) = @_;

      push @extra_params, "cache",             "1";
      return $self->SUPER::load_tmpl($tmpl_file, @extra_params);


This is documentation of how it is done internally. If you actually are looking for how to use this module, see SYNOPSIS. There isn't anything else to do than using this plugin.


Will be called when your Module uses HTML::Template::Compiled. Registers callbacks at the init and the load_tmpl stages. This is how the plugin mechanism works.


Adds the parameter c each template that will be processed. See DEFAULT PARAMETERS for more information.


Set html_tmpl_class to HTML::Template::Compiled at the init stage. That way, each time a template is loaded using load_tmpl, an instance of HTML::Template::Compiled will be created instead of the defualt HTML::Template. See the CGI::Appliaction manpage for more information.


This method exists to ensure backward compatibility only. It overrides CGI::Application's load_tmpl() when this plugin is used the old way. See BACKWARD COMPATIBILITY for more information and please just don't use it that way anymore.

For the most part, this is the exact load_tmpl() method from CGI::Application, except it uses HTML::Template::Compiled instead of HTML::Template.

See the CGI::Application reference for more detailed information on what parameters can be passed to load_tmpl().


You can still use the old method using the module by inheriting from it. This is not recommended, as it overrides CGI::Application's load_tmpl().

    # In your CGI::Application-derived base class. . . 
    use base ("CGI::Application::Plugin::HTCompiled", "CGI::Application");

    # Later, in a run mode far, far away. . . 
    sub view
        my $self = shift;
        my $username = $self->query->param("user");
        my $user     = My::Users->retrieve($username);

        my $tmpl_view = $self->load_tmpl( "view_user.tmpl" );

        $tmpl_view->param( user => $user );

        return $tmpl_view->output();


Define your CGI::Application derived base class.

        package CGIApplicationDerivedBaseClass;
        use strict;
        use warnings;
        use FindBin qw/$Bin/;
        use lib $Bin . '/lib';
        use base qw/CGI::Application/;
        use CGI::Application::Plugin::HTCompiled;
        =head1 NAME
        CGIApplicationDerivedBaseClass - Perl extension for demonstrating
        =head1 SYNOPSIS
                use strict;
                use warnings;
                my $app = CGIApplicationDerivedBaseClass->new();
        =head1 DESCRIPTION
        This demonstrates, how to use CGI::Application::Plugin::HTCompiled.
        =head1 METHODS
        =head2 setup()
        Defined runmodes, etc.
        sub setup {
                my $self = shift;
        } # /setup
        =head2 start()
        sub start {
                my $self        = shift;
                my $tmpl_content = qq~
        <p>You are here: <TMPL_VAR c.query.url> (this is HTML::Compiled magic)</p>
        <p>You are using CAP::HTC version <TMPL_VAR version></p>
                my $t = $self->load_tmpl(\$tmpl_content);
                $t->param(version => $CGI::Application::Plugin::HTCompiled::VERSION);
                return $t->output();
        } # /start
        =head1 SEE ALSO
        CGI::Application, CGI::Application::Plugin::HTCompiled.
        =head1 AUTHOR
        Alexander Becler, E<lt>c a p f a n < a t > g m x . d eE<gt>
        Copyright (C) 2009 by Alexander Becker
        This library is free software; you can redistribute it and/or modify it under
        the same terms as Perl itself, either Perl version 5.8.8 or, at your option,
        any later version of Perl 5 you may have available.

Create an instance and run.

        use strict;
        use warnings;
        use CGIApplicationDerivedBaseClass;
        my $app = CGIApplicationDerivedBaseClass->new();


Alexander Becker <>, Mark Stosberg <> ...but largely modeled on HTDot plugin by Jason A. Crome.


Please report any bugs or feature requests to, or through the web interface at I will be notified, and then you'll automatically be notified of progress on your bug as I make changes.


The usual crowd in #cgiapp on


CGI::Application, HTML::Template, HTML::Template::Compiled,


Copyright 2005 Mark Stosberg, all rights reserved.

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

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