Provided by: libcatalyst-modules-perl_47_all 
NAME
Catalyst::Controller::FormBuilder - Catalyst FormBuilder Base Controller
SYNOPSIS
package MyApp::Controller::Books;
use base 'Catalyst::Controller::FormBuilder';
# optional config setup
__PACKAGE__->config(
'Controller::FormBuilder' = {
template_type => 'HTML::Template', # default is 'TT' (e.g. TT2)
}
);
# looks for books/edit.fb form configuration file, based on the presence of
# the ":Form" attribute.
sub edit : Local Form {
my ( $self, $c, @args ) = @_;
my $form = $self->formbuilder;
# add email form field to fields already defined edit.fb
$form->field( name => 'email', validate => 'EMAIL' );
if ( $form->submitted ) {
if ( $form->validate ) {
return $c->response->body("VALID FORM");
}
else {
$c->stash->{ERROR} = "INVALID FORM";
$c->stash->{invalid_fields} =
[ grep { !$_->validate } $form->fields ];
}
}
}
# explicitedly use books/edit.fb, otherwise books/view.fb is used
sub view : Local Form('/books/edit') {
my ( $self, $c ) = @_;
$c->stash->{template} = "books/edit.tt" # TT2 template;
}
DESCRIPTION
This base controller merges the functionality of CGI::FormBuilder with Catalyst and the
following templating systems: Template Toolkit, Mason and HTML::Template. This gives you
access to all of FormBuilder's niceties, such as controllablefield stickiness,
multilingual support, and Javascript generation. For more details, see CGI::FormBuilder or
the website at:
http://www.formbuilder.org
FormBuilder usage within Catalyst is straightforward. Since Catalyst handles page
rendering, you don't call FormBuilder's "render()" method, as you would normally. Instead,
you simply add a ":Form" attribute to each method that you want to associate with a form.
This will give you access to a FormBuilder "$self->formbuilder" object within that
controller method:
# An editing screen for books
sub edit : Local Form {
my ( $self, $c ) = @_;
$self->formbuilder->method('post'); # set form method
}
The out-of-the-box setup is to look for a form configuration file that follows the
CGI::FormBuilder::Source::File format (essentially YAML), named for the current action
url. So, if you were serving "/books/edit", this plugin would look for:
root/forms/books/edit.fb
(The path is configurable.) If no source file is found, then it is assumed you'll be
setting up your fields manually. In your controller, you will have to use the
"$self->formbuilder" object to create your fields, validation, and so on.
Here is an example "edit.fb" file:
# Form config file root/forms/books/edit.fb
name: books_edit
method: post
fields:
title:
label: Book Title
type: text
size: 40
required: 1
author:
label: Author's Name
type: text
size: 80
validate: NAME
required: 1
isbn:
label: ISBN#
type: text
size: 20
validate: /^(\d{10}|\d{13})$/
required: 1
desc:
label: Description
type: textarea
cols: 80
rows: 5
submit: Save New Book
This will automatically create a complete form for you, using the specified fields. Note
that the "root/forms" path is configurable; this path is used by default to integrate with
the "TTSite" helper.
Within your controller, you can call any method that you would on a normal
"CGI::FormBuilder" object on the "$self->formbuilder" object. To manipulate the field
named "desc", simply call the "field()" method:
# Change our desc field dynamically
$self->formbuilder->field(
name => 'desc',
label => 'Book Description',
required => 1
);
To populate field options for "country", you might use something like this to iterate
through the database:
$self->formbuilder->field(
name => 'country',
options =>
[ map { [ $_->id, $_->name ] } $c->model('MyApp::Country')->all ],
other => 1, # create "Other:" box
);
This would create a select list with the last element as "Other:" to allow the addition of
more countries. See CGI::FormBuilder for methods available to the form object.
The FormBuilder methodolody is to handle both rendering and validation of the form. As
such, the form will "loop back" onto the same controller method. Within your controller,
you would then use the standard FormBuilder submit/validate check:
if ( $self->formbuilder->submitted && $self->formbuilder->validate ) {
$c->forward('/books/save');
}
This would forward to "/books/save" if the form was submitted and passed field validation.
Otherwise, it would automatically re-render the form with invalid fields highlighted,
leaving the database unchanged.
To render the form in your tt2 template for example, you can use "render" to get a default
table-based form:
<!-- root/src/books/edit.tt -->
[% FormBuilder.render %]
You can also get fine-tuned control over your form layout from within your template.
TEMPLATES
The simplest way to get your form into HTML is to reference the "FormBuilder.render"
method, as shown above. However, frequently you want more control.
Only Template Toolkit, Mason and HTML::Template are currently supported, but if your
templating system's stash requirements are identical to one of these, simply choose and
define it via the "template_type" config option. Of course, make sure you have a View to
support the template, since this module does not render templates.
From within your template, you can reference any of FormBuilder's methods to manipulate
form HTML, JavaScript, and so forth. For example, you might want exact control over
fields, rendering them in a "<div>" instead of a table. You could do something like this:
<!-- root/src/books/edit.tt -->
<head>
<title>[% formbuilder.title %]</title>
[% formbuilder.jshead %]<!-- javascript -->
</head>
<body>
[% formbuilder.start -%]
<div id="form">
[% FOREACH field IN formbuilder.fields -%]
<p>
<label>
<span [% IF field.required %]class="required"[%END%]>[%field.label%]</span>
</label>
[% field.field %]
[% IF field.invalid -%]
<span class="error">
Missing or invalid entry, please try again.
</span>
[% END %]
</p>
[% END %]
<div id="submit">[% formbuilder.submit %]</div>
<div id="reset">[% formbuilder.reset %]</div>
</div>
</div>
[% formbuilder.end -%]
</body>
In this case, you would not call "FormBuilder.render", since that would only result in a
duplicate form (once using the above expansion, and a second time using FormBuilder's
default rendering).
Note that the above form could become a generic "form.tt" template which you simply
included in all your files, since there is nothing specific to a given form hardcoded in
(that's the idea, after all).
You can also get some ideas based on FormBuilder's native Template Toolkit support at
CGI::FormBuilder::Template::TT2.
CONFIGURATION
You can set defaults for your forms using Catalyst's config method inside your controller.
__PACKAGE__->config(
'Controller::FormBuilder' => {
new => {
method => 'post',
# stylesheet => 1,
messages => '/locale/fr_FR/form_messages.txt',
},
form_path =>
File::Spec->catfile( $c->config->{home}, 'root', 'forms' ),
method_name => 'form',
template_type => 'HTML::Template',
stash_name => 'form',
obj_name => 'FormBuilder',
form_suffix => 'fb',
attr_name => 'Form',
source_type => 'CGI::FormBuilder::Source::File',
}
);
"new"
This accepts the exact same options as FormBuilder's "new()" method (which is a lot).
See CGI::FormBuilder for a full list of options.
"form_path"
The path to configuration files. This should be set to an absolute path to prevent
problems. By default, it is set to:
File::Spec->catfile( $c->config->{home}, 'root', 'forms' )
This can be a colon-separated list of directories if you want to specify multiple
paths (ie, "/templates1:/template2"), or an array ref (ie, [qw/template1
templates2/]).
"form_suffix"
The suffix that configuration files have. By default, it is "fb".
"method_name"
Accessor method name available in your controller. By default, it is "formbuilder".
"template_type"
Defines the Catalyst View that the stash will be prepared for. Possible values are:
HTML::Template, Mason, TT. By default, it is "TT".
"stash_name"
Not applicable for HTML::Template view. By default, it is "formbuilder". e.g.
$c->stash->{formbuilder} = $formbuilder->prepare.
"obj_name"
Not applicable for HTML::Template view. By default, it is "FormBuilder". e.g.
$c->stash->{FormBuilder} = $formbuilder.
"attr_name"
The attribute name. By default, it is "Form". e.g. sub edit : Form { ... }
"source_type"
The source adapter class name. By default, it is "CGI::FormBuilder::Source::File". See
CGI::FormBuilder::Source
In addition, the following FormBuilder options are automatically set for you:
"action"
This is set to the URL for the current action. FormBuilder is designed to handle a
full request cycle, meaning both rendering and submission. If you want to override
this, simply use the "$self->formbuilder" object:
$self->formbuilder->action('/action/url');
The default setting is "$c->req->path".
"cookies"
Handling these are disabled (use Catalyst).
"debug"
This is set to correspond with Catalyst's debug setting.
"header"
This is disabled. Instead, use Catalyst's header routines.
"params"
This is set to get parameters from Catalyst, using "$c->req". To override this, use
the "$self->formbuilder" object:
$self->formbuilder->params(\%param_hashref);
Overriding this is not recommended.
"source"
This determines which source file is loaded, to setup your form. By default, this is
set to the name of the action URL, with ".fb" appended. For example, "edit_form()"
would be associated with an "edit_form.fb" source file.
To override this, include the path as the argument to the method attribute:
sub edit : Local Form('/books/myEditForm') { }
If no source file is found, then it is assumed you'll be setting up your fields
manually. In your controller, you will have to use the "$self->formbuilder" object to
create your fields, validation, and so on.
SEE ALSO
CGI::FormBuilder, CGI::FormBuilder::Source::File, CGI::FormBuilder::Template::TT2,
Catalyst::Manual, Catalyst::Request, Catalyst::Response
AUTHOR
Copyright (c) 2006 Juan Camacho <formbuilder@suspenda.com>. All Rights Reserved.
Thanks to Laurent Dami and Roy-Magne Mo for suggestions.
This library is free software, you can redistribute it and/or modify it under the same
terms as Perl itself.