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Text-Xslate-0.1039
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/ Text::Xslate::Cookbook

NAME

Text::Xslate::Cookbook - How to cook Xslate templates

DESCRIPTION

The Xslate cookbook is a set of recipes showing Xslate features.

RECIPES

How to manage HTML forms

Managing HTML forms is an important issue on web applications. you'd better to use modules that manage HTML forms, rather than do something with templates by yourself. Basically there are two basic solutions in Xslate: use of FillInForm or HTML form builders.

In both solutions, one should not use the mark_raw filter in templates because of its security risks. Instead, application code should be responsible for it.

Using FillInForm

One solution to manage HTML forms is to use FillInForm modules with the block filter syntax and the raw filter.

Example code using HTML::FillInForm:

#!perl -w
use strict;
use Text::Xslate qw(mark_raw);
use HTML::FillInForm;

sub fillinform {
    my($q) = @_;

    return sub {
        my($html) = @_;
        return mark_raw(HTML::FillInForm->fill(\$html, $q));
    };
}

my $tx  = Text::Xslate->new(
    function => {
        fillinform => \&fillinform,
    },
);

my %vars = (
    q => { foo => "<filled value>" },
);
print $tx->render_string(<<'T', \%vars);
FillInForm:
: block form | fillinform($q) -> {
<form>
<input type="text" name="foo" />
</form>
: }
T

Output:

FillInForm:
<form>
<input type="text" name="foo" value="&lt;filled value&gt;" />
</form>

See also HTML::FillInForm or HTML::FillInForm::Lite for details.

Using HTML form builders

Another solution to manage HTML forms is to use form builders.

Example code using HTML::Shakan:

#!psgi
use strict;
use Text::Xslate qw(mark_raw);
use HTML::Shakan;
use Plack::Request;

my $tx = Text::Xslate->new();

sub app {
    my($env) = @_;
    my $req  = Plack::Request->new($env);

    my $shakan = HTML::Shakan->new(
        request => $req,
        fields  => [ TextField(name => 'name', label => 'Your name: ') ],
    );

    my $res = $req->new_response(200);

    my $form = mark_raw($shakan->render());
    $res->body( $tx->render_string(<<'T', { form => $form }) );
<!doctype html>
<html>
<head><title>Building form</title></head>
<body>
<form>
<p>
Form:<br />
<: $form :>
</p>
</body>
</html>
T
    return $res->finalize();

}

return \&app;

Output:

<!doctype html>
<html>
<head><title>Building form</title></head>
<body>
<form>
<p>
Form:<br />
<label for="id_name">Your name</label>
<input id="id_name" name="name" type="text" value="&lt;Xslate&gt;" />
</p>
</body>
</html>

See also HTML::Shakan for details.

How to apply uri escape to template expressions

Use URI::Escape or URI::Escape::XS.

Code using URI::Escape:

#!perl -w
use strict;
use Text::Xslate;

my $tx  = Text::Xslate->new(
    module => ['URI::Escape'],
);

print $tx->render_string(<<'T', { app_param => "foo & bar" });
<a href="http://example.com/app/<:
    $app_param | uri_escape_utf8 :>">something</a>
T

Output:

<a href="http://example.com/app/foo%20%26%20bar">something</a>

See also URI::Escape or URI::Escape::XS.

How to use Template Toolkit's WRAPPER feature in Kolon

Use template cascading, which is a super-set of the WRAPPER directive.

wrapper.tx:

<div class="wrapper">
block content -> { }
</div>

content.tx

: cascade wrapper

: override content -> {
    Hello, world!
: }

Output:

<div class="wrapper">
    Hello, world!
</div>

SEE ALSO

Text::Xslate