The London Perl and Raku Workshop takes place on 26th Oct 2024. If your company depends on Perl, please consider sponsoring and/or attending.


JavaScript::DataFormValidator - JavaScript form validation from a Perl Data::FormValidator profile


This module helps with setting up a JavaScript validation for a form using Data.FormValidator, a JavaScript port of Data::FormValidator. A key feature of this system is that it allows you to use the exact same validation profile for both Perl and JavaScript validation.

You should read the docs for the JavaScript implementation for some limitations:

Here's an example with HTML::Template syntax:

  <script type="text/javascript" src="../JSAN/Data/FormValidator.js"></script>

  <!-- tmpl_var dfv_profile -->

  <form action="/foo"  <tmpl_var js_dfv_onsubmit > >
  <!-- ... ->

And then back in your perl code...

 use JavaScript::DataFormValidator;
 my $t = HTML::Template->new_file('foo.html');  
    dfv_profile => js_dfv_profile( 'my_form' => {
            required => [qw/email first_name/],
            optional => 'last_name',
            constraints => {
                email => 'email',
    js_dfv_onsubmit => js_dfv_onsubmit('my_form');


The Data.FormValidator JavaScript file must be copied to your server so that you can call it. Download the latest version from here:

js_dfv_profile( $profile_name => \%profile_hash );

$dfv_profile_in_js = js_dfv_profile( $profile_name => \%profile_hash );

Takes a named Data::FormValidator profile in Perl, and returns a representation of it in JavaScript, for use with the Data.FormValidator JavaScript module.


Hopefully, it's done. It's very simple code.

However, the API may break and change in the first weeks after the the release as I get feedback. I'll plan to at least make a new release to remove this notice once things seem stable.


 $onsubmit_code = js_dfv_onsubmit($profile_name);

Returns the Javascript snippet to put in your <form> tag to call the basic check_and_report() JavaScript validation function.


This module is mostly released as a demonstration of how to integrate with the Data.FormValidator JavaScript project. For anything more complicated, it will probably be easier to use this source code as starting point for a custom solution.


Mark Stosberg, <mark at>


Please report any bugs or feature requests to bug-cgi-application-plugin-javascript-formvalidator at, 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.



This uses Data::JavaScript::Anon for the heavy lifting.


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.