1CGI::FormBuilder::TemplUasteer(3C)ontributed Perl DocumeCnGtIa:t:iFoonrmBuilder::Template(3)
2
6 CGI::FormBuilder::Template - Template adapters for FormBuilder
7
9 # Define a template engine
10 package CGI::FormBuilder::Template::Whatever;
12 use base 'Whatever::Template::Module';
13 sub new {
15 my $self = shift;
16 my $class = ref($self) || $self;
17 my %opt = @_;
18 # override some options
20 $opt{some_setting} = 0;
21 $opt{another_var} = 'Some Value';
22 # instantiate the template engine
24 $opt{engine} = Whatever::Template::Module->new(%opt);
25 return bless \%opt, $class;
27 }
28 sub render {
30 my $self = shift;
31 my $form = shift; # only arg is form object
32 # grab any manually-set template params
34 my %tmplvar = $form->tmpl_param;
35 # example template manipulation
37 my $html = $self->{engine}->do_template(%tmplvar);
38 return $html; # scalar HTML is returned
40 }
41
43 This documentation describes the usage of FormBuilder templates, as
44 well as how to write your own template adapter.
45 The template engines serve as adapters between CPAN template modules
47 and FormBuilder. A template engine is invoked by using the "template"
48 option to the top-level new() method:
49 my $form = CGI::FormBuilder->new(
51 template => 'filename.tmpl'
52 );
53 This example points to a filename that contains an "HTML::Template"
55 compatible template to use to layout the HTML. You can also specify the
56 "template" option as a reference to a hash, allowing you to further
57 customize the template processing options, or use other template
58 engines.
59 For example, you could turn on caching in "HTML::Template" with
61 something like the following:
62 my $form = CGI::FormBuilder->new(
64 fields => \@fields,
65 template => {
66 filename => 'form.tmpl',
67 shared_cache => 1
68 }
69 );
70 As mentioned, specifying a hashref allows you to use an alternate
72 template processing system like the "Template Toolkit". A minimal
73 configuration would look like this:
74 my $form = CGI::FormBuilder->new(
76 fields => \@fields,
77 template => {
78 type => 'TT2', # use Template Toolkit
79 template => 'form.tmpl',
80 },
81 );
82 The "type" option specifies the name of the engine. Currently accepted
84 types are:
85 Builtin - Included, default rendering if no template specified
87 Div - Render form using <div> (no tables)
88 HTML - HTML::Template
89 Text - Text::Template
90 TT2 - Template Toolkit
91 Fast - CGI::FastTemplate
92 CGI_SSI - CGI::SSI
93 In addition to one of these types, you can also specify a complete
95 package name, in which case that module will be autoloaded and its
96 new() and render() routines used. For example:
97 my $form = CGI::FormBuilder->new(
99 fields => \@fields,
100 template => {
101 type => 'My::Template::Module',
102 template => 'form.tmpl',
103 },
104 );
105 All other options besides "type" are passed to the constructor for that
107 templating system verbatim, so you'll need to consult those docs to see
108 what all the different options do. Skip down to "SEE ALSO".
109
111 In addition to the above included template engines, it is also possible
112 to write your own rendering module. If you come up with something cool,
113 please let the mailing list know!
114 To do so, you need to write a module which has a sub called render().
116 This sub will be called by FormBuilder when "$form->render" is called.
117 This sub can do basically whatever it wants, the only thing it has to
118 do is return a scalar string which is the HTML to print out.
119 This is actually not hard. Here's a simple adapter which would
121 manipulate an "HTML::Template" style template:
122 # This file is My/HTML/Template.pm
124 package My::HTML::Template;
125 use CGI::FormBuilder::Template::HTML;
127 use base 'CGI::FormBuilder::Template::HTML';
128 sub render {
130 my $self = shift; # class object
131 my $form = shift; # $form as only argument
132 # the template object (engine) lives here
134 my $tmpl = $self->engine;
135 # setup vars for our fields (objects)
137 for ($form->field) {
138 $tmpl->param($_ => $_->value);
139 }
140 # render output
142 my $html = $tmpl->output;
143 # return scalar;
145 return $html;
146 }
147 1; # close module
148 Then in FormBuilder:
150 use CGI::FormBuilder;
152 use My::HTML::Template; # your module
153 my $tmpl = My::HTML::Template->new;
155 my $form = CGI::FormBuilder->new(
157 fields => [qw(name email)],
158 header => 1,
159 template => $tmpl # pass template object
160 );
161 # set our company from an extra CGI param
163 my $co = $form->cgi_param('company');
164 $tmpl->engine->param(company => $co);
165 # and render like normal
167 print $form->render;
168 That's it! For more details, the best thing to do is look through the
170 guts of one of the existing template engines and go from there.
171
173 CGI::FormBuilder, CGI::FormBuilder::Template::HTML,
174 CGI::FormBuilder::Template::Text, CGI::FormBuilder::Template::TT2,
175 CGI::FormBuilder::Template::Fast, CGI::FormBuilder::Template::CGI_SSI
176
178 $Id: Template.pm 97 2007-02-06 17:10:39Z nwiger $
179
181 Copyright (c) Nate Wiger <http://nateware.com>. All Rights Reserved.
182 This module is free software; you may copy this under the terms of the
184 GNU General Public License, or the Artistic License, copies of which
185 should have accompanied your Perl kit.
186perl v5.36.0 2023-01-20 CGI::FormBuilder::Template(3)