#NAME

CGI::FormBuilder::Template::TT2 - FormBuilder interface to Template Toolkit

#SYNOPSIS

my $form = CGI::FormBuilder->new(
                fields   => \@fields,
                template => {
                    type => 'TT2',
                    template => 'form.tmpl',
                    variable => 'form',
                }
           );

#DESCRIPTION

This engine adapts FormBuilder to use Template Toolkit. To do so, specify the template option as a hashref which includes the type option set to TT2 and the template option set to the name of the template you want processed. You can also add variable as an option (among others) to denote the variable name that you want the form data to be referenced by:

my $form = CGI::FormBuilder->new(
                fields => \@fields,
                template => {
                    type => 'TT2',
                    template => 'userinfo.tmpl',
                    variable => 'form',
                }
           );

The following methods are provided (usually only used internally):

#engine

Returns a reference to the Template object

#prepare

Returns a hash of all the fields ready to be rendered.

#render

Uses the prepared hash and expands the template, returning a string of HTML.

#TEMPLATES

The template might look something like this:

<html>
<head>
  <title>[% form.title %]</title>
  [% form.jshead %]
</head>
<body>
  [% form.start %]
  <table>
    [% FOREACH field = form.fields %]
    <tr valign="top">
      <td>
        [% field.required
              ? "<b>$field.label</b>"
              : field.label
        %]
      </td>
      <td>
        [% IF field.invalid %]
        Missing or invalid entry, please try again.
    <br/>
    [% END %]

    [% field.field %]
  </td>
</tr>
    [% END %]
    <tr>
      <td colspan="2" align="center">
        [% form.submit %] [% form.reset %]
      </td>
    </tr>
  </table>
  [% form.end %]
</body>
</html>

By default, the Template Toolkit makes all the form and field information accessible through simple variables.

[% jshead %]  -  JavaScript to stick in <head>
[% title  %]  -  The <title> of the HTML form
[% start  %]  -  Opening <form> tag and internal fields
[% submit %]  -  The submit button(s)
[% reset  %]  -  The reset button
[% end    %]  -  Closing </form> tag
[% fields %]  -  List of fields
[% field  %]  -  Hash of fields (for lookup by name)

You can specify the variable option to have all these variables accessible under a certain namespace. For example:

my $form = CGI::FormBuilder->new(
    fields => \@fields,
    template => {
         type => 'TT2',
         template => 'form.tmpl',
         variable => 'form'
    },
);

With variable set to form the variables are accessible as:

[% form.jshead %]
[% form.start  %]
etc.

You can access individual fields via the field variable.

For a field named...  The field data is in...
--------------------  -----------------------
job                   [% form.field.job   %]
size                  [% form.field.size  %]
email                 [% form.field.email %]

Each field contains various elements. For example:

[% myfield = form.field.email %]

[% myfield.label    %]  # text label
[% myfield.field    %]  # field input tag
[% myfield.value    %]  # first value
[% myfield.values   %]  # list of all values
[% myfield.option   %]  # first value
[% myfield.options  %]  # list of all values
[% myfield.required %]  # required flag
[% myfield.invalid  %]  # invalid flag

The fields variable contains a list of all the fields in the form. To iterate through all the fields in order, you could do something like this:

[% FOREACH field = form.fields %]
<tr>
 <td>[% field.label %]</td> <td>[% field.field %]</td>
</tr>
[% END %]

If you want to customise any of the Template Toolkit options, you can set the engine option to contain a reference to an existing Template object or hash reference of options which are passed to the Template constructor. You can also set the data item to define any additional variables you want accessible when the template is processed.

my $form = CGI::FormBuilder->new(
    fields => \@fields,
    template => {
         type => 'TT2',
         template => 'form.tmpl',
         variable => 'form',
         engine   => {
              INCLUDE_PATH => '/usr/local/tt2/templates',
         },
         data => {
              version => 1.23,
              author  => 'Fred Smith',
         },
    },
);

For further details on using the Template Toolkit, see Template or http://www.template-toolkit.org

#REVISION

$Id: TT2.pm 100 2007-03-02 18:13:13Z nwiger $

#AUTHOR

Template Tookit support is largely due to a huge patch from Andy Wardley.

This module is free software; you may copy this under the terms of the GNU General Public License, or the Artistic License, copies of which should have accompanied your Perl kit.

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