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TagHelpers.pm
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TagHelpers.pm
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package Mojolicious::Plugin::TagHelpers;
use Mojo::Base 'Mojolicious::Plugin';
use Mojo::ByteStream 'b';
use Mojo::Util 'xml_escape';
sub register {
my ($self, $app) = @_;
# Text field variations
my @time = qw(date datetime month time week);
for my $name (@time, qw(color email number range search tel text url)) {
$app->helper("${name}_field" => sub { _input(@_, type => $name) });
}
# Add "base_tag" helper
$app->helper(
base_tag => sub { _tag('base', href => shift->req->url->base->clone->userinfo(undef), @_) });
# Add "checkbox" helper
$app->helper(check_box =>
sub { _input(shift, shift, value => shift, @_, type => 'checkbox') });
# Add "file_field" helper
$app->helper(file_field =>
sub { shift; _tag('input', name => shift, @_, type => 'file') });
# Add "form_for" helper
$app->helper(form_for => \&_form_for);
# Add "hidden_field" helper
$app->helper(hidden_field => \&_hidden_field);
# Add "image" helper
$app->helper(image => sub { _tag('img', src => shift->url_for(shift), @_) });
# Add "input_tag" helper
$app->helper(input_tag => sub { _input(@_) });
# Add "javascript" helper
$app->helper(javascript => \&_javascript);
# Add "link_to" helper
$app->helper(link_to => \&_link_to);
# Add "password_field" helper
$app->helper(password_field =>
sub { shift; _tag('input', name => shift, @_, type => 'password') });
# Add "radio_button" helper
$app->helper(radio_button =>
sub { _input(shift, shift, value => shift, @_, type => 'radio') });
# Add "select_field" helper
$app->helper(select_field => \&_select_field);
# Add "stylesheet" helper
$app->helper(stylesheet => \&_stylesheet);
# Add "submit_button" helper
$app->helper(submit_button => \&_submit_button);
# Add "t" and "tag" helpers
$app->helper($_ => sub { shift; _tag(@_) }) for qw(t tag);
# Add "text_area" helper
$app->helper(text_area => \&_text_area);
}
sub _form_for {
my ($self, @url) = (shift, shift);
push @url, shift if ref $_[0] eq 'HASH';
# POST detection
my @post;
if (my $r = $self->app->routes->find($url[0])) {
my %methods = (GET => 1, POST => 1);
do {
my @via = @{$r->via || []};
%methods = map { $_ => 1 } grep { $methods{$_} } @via if @via;
} while $r = $r->parent;
@post = (method => 'POST') if $methods{POST} && !$methods{GET};
}
return _tag('form', action => $self->url_for(@url), @post, @_);
}
sub _hidden_field {
my $self = shift;
my %attrs = (name => shift, value => shift, @_, type => 'hidden');
return _tag('input', %attrs);
}
sub _input {
my ($self, $name) = (shift, shift);
# Attributes
my %attrs = @_ % 2 ? (value => shift, @_) : @_;
# Values
my @values = $self->param($name);
# Special selection value
my $type = $attrs{type} || '';
if (@values && $type ne 'submit') {
# Checkbox or radiobutton
my $value = $attrs{value} // '';
if ($type eq 'checkbox' || $type eq 'radio') {
$attrs{value} = $value;
$attrs{checked} = 'checked' if grep { $_ eq $value } @values;
}
# Others
else { $attrs{value} = $values[0] }
return _tag('input', name => $name, %attrs);
}
# Empty tag
return _tag('input', name => $name, %attrs);
}
sub _javascript {
my $self = shift;
# CDATA
my $cb = sub {''};
if (ref $_[-1] eq 'CODE') {
my $old = pop;
$cb = sub { "//<![CDATA[\n" . $old->() . "\n//]]>" }
}
# URL
my $src = @_ % 2 ? $self->url_for(shift) : undef;
return _tag('script', @_, $src ? (src => $src) : (), $cb);
}
sub _link_to {
my ($self, $content) = (shift, shift);
my @url = ($content);
# Content
unless (defined $_[-1] && ref $_[-1] eq 'CODE') {
@url = (shift);
push @_, $content;
}
# Captures
push @url, shift if ref $_[0] eq 'HASH';
return _tag('a', href => $self->url_for(@url), @_);
}
sub _select_field {
my ($self, $name, $options, %attrs) = (shift, shift, shift, @_);
# "option" callback
my %values = map { $_ => 1 } $self->param($name);
my $option = sub {
# Pair
my $pair = shift;
$pair = [$pair => $pair] unless ref $pair eq 'ARRAY';
# Attributes
my %attrs = (value => $pair->[1]);
$attrs{selected} = 'selected' if exists $values{$pair->[1]};
%attrs = (%attrs, @$pair[2 .. $#$pair]);
return _tag('option', %attrs, sub { xml_escape $pair->[0] });
};
# "optgroup" callback
my $optgroup = sub {
# Parts
my $parts = '';
for my $group (@$options) {
# "optgroup" tag
if (ref $group eq 'HASH') {
my ($label, $values) = each %$group;
my $content = join '', map { $option->($_) } @$values;
$parts .= _tag('optgroup', label => $label, sub {$content});
}
# "option" tag
else { $parts .= $option->($group) }
}
return $parts;
};
return _tag('select', name => $name, %attrs, $optgroup);
}
sub _stylesheet {
my $self = shift;
# CDATA
my $cb;
if (ref $_[-1] eq 'CODE') {
my $old = pop;
$cb = sub { "/*<![CDATA[*/\n" . $old->() . "\n/*]]>*/" }
}
# URL
my $href = @_ % 2 ? $self->url_for(shift) : undef;
# "link" or "style" tag
return $href
? _tag('link', rel => 'stylesheet', href => $href, media => 'screen', @_)
: _tag('style', @_, $cb);
}
sub _submit_button {
my $self = shift;
return _tag('input', value => shift // 'Ok', @_, type => 'submit');
}
sub _tag {
my $name = shift;
# Content
my $cb = ref $_[-1] eq 'CODE' ? pop : undef;
my $content = @_ % 2 ? pop : undef;
# Start tag
my $tag = "<$name";
# Attributes
my %attrs = @_;
for my $key (sort keys %attrs) {
$tag .= qq{ $key="} . xml_escape($attrs{$key} // '') . '"';
}
# End tag
if ($cb || defined $content) {
$tag .= '>' . ($cb ? $cb->() : xml_escape($content)) . "</$name>";
}
# Empty element
else { $tag .= ' />' }
# Prevent escaping
return b($tag);
}
sub _text_area {
my ($self, $name) = (shift, shift);
# Content
my $cb = ref $_[-1] eq 'CODE' ? pop : sub {''};
my $content = @_ % 2 ? shift : undef;
# Make sure content is wrapped
if (defined($content = $self->param($name) // $content)) {
$cb = sub { xml_escape $content }
}
return _tag('textarea', name => $name, @_, $cb);
}
1;
=head1 NAME
Mojolicious::Plugin::TagHelpers - Tag helpers plugin
=head1 SYNOPSIS
# Mojolicious
$self->plugin('TagHelpers');
# Mojolicious::Lite
plugin 'TagHelpers';
=head1 DESCRIPTION
L<Mojolicious::Plugin::TagHelpers> is a collection of HTML tag helpers for
L<Mojolicious>.
Most form helpers can automatically pick up previous input values and will
show them as default. You can also use
L<Mojolicious::Plugin::DefaultHelpers/"param"> to set them manually and let
necessary attributes always be generated automatically.
% param country => 'germany' unless param 'country';
<%= radio_button country => 'germany' %> Germany
<%= radio_button country => 'france' %> France
<%= radio_button country => 'uk' %> UK
This is a core plugin, that means it is always enabled and its code a good
example for learning how to build new plugins, you're welcome to fork it.
=head1 HELPERS
L<Mojolicious::Plugin::TagHelpers> implements the following helpers.
=head2 C<base_tag>
%= base_tag
Generate portable C<base> tag refering to the current base URL.
<base href="http://localhost/cgi-bin/myapp.pl" />
=head2 C<check_box>
%= check_box employed => 1
%= check_box employed => 1, id => 'foo'
Generate checkbox input element. Previous input values will automatically get
picked up and shown as default.
<input name="employed" type="checkbox" value="1" />
<input id="foo" name="employed" type="checkbox" value="1" />
=head2 C<color_field>
%= color_field 'background'
%= color_field background => '#ffffff'
%= color_field background => '#ffffff', id => 'foo'
Generate color input element. Previous input values will automatically get
picked up and shown as default.
<input name="background" type="color" />
<input name="background" type="color" value="#ffffff" />
<input id="foo" name="background" type="color" value="#ffffff" />
=head2 C<date_field>
%= date_field 'end'
%= date_field end => '2012-12-21'
%= date_field end => '2012-12-21', id => 'foo'
Generate date input element. Previous input values will automatically get
picked up and shown as default.
<input name="end" type="date" />
<input name="end" type="date" value="2012-12-21" />
<input id="foo" name="end" type="date" value="2012-12-21" />
=head2 C<datetime_field>
%= datetime_field 'end'
%= datetime_field end => '2012-12-21T23:59:59Z'
%= datetime_field end => '2012-12-21T23:59:59Z', id => 'foo'
Generate datetime input element. Previous input values will automatically get
picked up and shown as default.
<input name="end" type="datetime" />
<input name="end" type="datetime" value="2012-12-21T23:59:59Z" />
<input id="foo" name="end" type="datetime" value="2012-12-21T23:59:59Z" />
=head2 C<email_field>
%= email_field 'notify'
%= email_field notify => 'nospam@example.com'
%= email_field notify => 'nospam@example.com', id => 'foo'
Generate email input element. Previous input values will automatically get
picked up and shown as default.
<input name="notify" type="email" />
<input name="notify" type="email" value="nospam@example.com" />
<input id="foo" name="notify" type="email" value="nospam@example.com" />
=head2 C<file_field>
%= file_field 'avatar'
%= file_field 'avatar', id => 'foo'
Generate file input element.
<input name="avatar" type="file" />
<input id="foo" name="avatar" type="file" />
=head2 C<form_for>
%= form_for login => begin
%= text_field 'first_name'
%= submit_button
% end
%= form_for login => {format => 'txt'} => (method => 'POST') => begin
%= text_field 'first_name'
%= submit_button
% end
%= form_for '/login' => (method => 'POST') => begin
%= text_field 'first_name'
%= submit_button
% end
%= form_for 'http://kraih.com/login' => (method => 'POST') => begin
%= text_field 'first_name'
%= submit_button
% end
Generate portable form for route, path or URL. For routes that allow C<POST>
but not C<GET>, a C<method> attribute will be automatically added.
<form action="/path/to/login">
<input name="first_name" />
<input value="Ok" type="submit" />
</form>
<form action="/path/to/login.txt" method="POST">
<input name="first_name" />
<input value="Ok" type="submit" />
</form>
<form action="/login" method="POST">
<input name="first_name" />
<input value="Ok" type="submit" />
</form>
<form action="http://kraih.com/login" method="POST">
<input name="first_name" />
<input value="Ok" type="submit" />
</form>
=head2 C<hidden_field>
%= hidden_field foo => 'bar'
%= hidden_field foo => 'bar', id => 'bar'
Generate hidden input element.
<input name="foo" type="hidden" value="bar" />
<input id="bar" name="foo" type="hidden" value="bar" />
=head2 C<image>
%= image '/images/foo.png'
%= image '/images/foo.png', alt => 'Foo'
Generate image tag.
<img src="/images/foo.png" />
<img alt="Foo" src="/images/foo.png" />
=head2 C<input_tag>
%= input_tag 'first_name'
%= input_tag first_name => 'Default name'
%= input_tag 'employed', type => 'checkbox'
Generate form input element. Previous input values will automatically get
picked up and shown as default.
<input name="first_name" />
<input name="first_name" value="Default name" />
<input name="employed" type="checkbox" />
=head2 C<javascript>
%= javascript '/script.js'
%= javascript begin
var a = 'b';
% end
Generate portable script tag for C<Javascript> asset.
<script src="/script.js" />
<script><![CDATA[
var a = 'b';
]]></script>
=head2 C<link_to>
%= link_to Home => 'index'
%= link_to Home => 'index' => {format => 'txt'} => (class => 'links')
%= link_to index => {format => 'txt'} => (class => 'links') => begin
Home
% end
<%= link_to index => begin %>Home<% end %>
<%= link_to '/path/to/file' => begin %>File<% end %>
<%= link_to 'http://mojolicio.us' => begin %>Mojolicious<% end %>
<%= link_to url_for->query(foo => 'bar')->to_abs => begin %>Retry<% end %>
Generate portable link to route, path or URL, defaults to using the
capitalized link target as content.
<a href="/path/to/index">Home</a>
<a class="links" href="/path/to/index.txt">Home</a>
<a class="links" href="/path/to/index.txt">
Home
</a>
<a href="/path/to/index">Home</a>
<a href="/path/to/file">File</a>
<a href="http://mojolicio.us">Mojolicious</a>
<a href="http://127.0.0.1:3000/current/path?foo=bar">Retry</a>
=head2 C<month_field>
%= month_field 'vacation'
%= month_field vacation => '2012-12'
%= month_field vacation => '2012-12', id => 'foo'
Generate month input element. Previous input values will automatically get
picked up and shown as default.
<input name="vacation" type="month" />
<input name="vacation" type="month" value="2012-12" />
<input id="foo" name="vacation" type="month" value="2012-12" />
=head2 C<number_field>
%= number_field 'age'
%= number_field age => 25
%= number_field age => 25, id => 'foo', min => 0, max => 200
Generate number input element. Previous input values will automatically get
picked up and shown as default.
<input name="age" type="number" />
<input name="age" type="number" value="25" />
<input id="foo" max="200" min="0" name="age" type="number" value="25" />
=head2 C<password_field>
%= password_field 'pass'
%= password_field 'pass', id => 'foo'
Generate password input element.
<input name="pass" type="password" />
<input id="foo" name="pass" type="password" />
=head2 C<radio_button>
%= radio_button country => 'germany'
%= radio_button country => 'germany', id => 'foo'
Generate radio input element. Previous input values will automatically get
picked up and shown as default.
<input name="country" type="radio" value="germany" />
<input id="foo" name="country" type="radio" value="germany" />
=head2 C<range_field>
%= range_field 'age'
%= range_field age => 25
%= range_field age => 25, id => 'foo', min => 0, max => 200
Generate range input element. Previous input values will automatically get
picked up and shown as default.
<input name="age" type="range" />
<input name="age" type="range" value="25" />
<input id="foo" max="200" min="200" name="age" type="range" value="25" />
=head2 C<search_field>
%= search_field 'q'
%= search_field q => 'perl'
%= search_field q => 'perl', id => 'foo'
Generate search input element. Previous input values will automatically get
picked up and shown as default.
<input name="q" type="search" />
<input name="q" type="search" value="perl" />
<input id="foo" name="q" type="search" value="perl" />
=head2 C<select_field>
%= select_field language => [qw(de en)]
%= select_field language => [qw(de en)], id => 'lang'
%= select_field country => [[Germany => 'de'], 'en']
%= select_field country => [{Europe => [[Germany => 'de'], 'en']}]
%= select_field country => [[Germany => 'de', class => 'europe'], 'en']
Generate select, option and optgroup elements. Previous input values will
automatically get picked up and shown as default.
<select name="language">
<option value="de">de</option>
<option value="en">en</option>
</select>
<select id="lang" name="language">
<option value="de">de</option>
<option value="en">en</option>
</select>
<select name="country">
<option value="de">Germany</option>
<option value="en">en</option>
</select>
<select id="lang" name="language">
<optgroup label="Europe">
<option value="de">Germany</option>
<option value="en">en</option>
</optgroup>
</select>
<select name="country">
<option class="europe" value="de">Germany</option>
<option value="en">en</option>
</select>
=head2 C<stylesheet>
%= stylesheet '/foo.css'
%= stylesheet begin
body {color: #000}
% end
Generate portable style or link tag for C<CSS> asset.
<link href="/foo.css" media="screen" rel="stylesheet" />
<style><![CDATA[
body {color: #000}
]]></style>
=head2 C<submit_button>
%= submit_button
%= submit_button 'Ok!', id => 'foo'
Generate submit input element.
<input type="submit" value="Ok" />
<input id="foo" type="submit" value="Ok!" />
=head2 C<t>
%=t div => 'some & content'
Alias for C<tag>.
<div>some & content</div>
=head2 C<tag>
%= tag 'div'
%= tag 'div', id => 'foo'
%= tag div => 'some & content'
<%= tag div => begin %>some & content<% end %>
HTML tag generator.
<div />
<div id="foo" />
<div>some & content</div>
<div>some & content</div>
Very useful for reuse in more specific tag helpers.
$self->tag('div');
$self->tag('div', id => 'foo');
$self->tag(div => sub { 'Content' });
Results are automatically wrapped in L<Mojo::ByteStream> objects to prevent
accidental double escaping.
=head2 C<tel_field>
%= tel_field 'work'
%= tel_field work => '123456789'
%= tel_field work => '123456789', id => 'foo'
Generate tel input element. Previous input values will automatically get
picked up and shown as default.
<input name="work" type="tel" />
<input name="work" type="tel" value="123456789" />
<input id="foo" name="work" type="tel" value="123456789" />
=head2 C<text_area>
%= text_area 'foo'
%= text_area 'foo', cols => 40
%= text_area foo => 'Default!', cols => 40
%= text_area foo => (cols => 40) => begin
Default!
% end
Generate textarea element. Previous input values will automatically get picked
up and shown as default.
<textarea name="foo"></textarea>
<textarea cols="40" name="foo"></textarea>
<textarea cols="40" name="foo">Default!</textarea>
<textarea cols="40" name="foo">
Default!
</textarea>
=head2 C<text_field>
%= text_field 'first_name'
%= text_field first_name => 'Default name'
%= text_field first_name => 'Default name', class => 'user'
Generate text input element. Previous input values will automatically get
picked up and shown as default.
<input name="first_name" type="text" />
<input name="first_name" type="text" value="Default name" />
<input class="user" name="first_name" type="text" value="Default name" />
=head2 C<time_field>
%= time_field 'start'
%= time_field start => '23:59:59'
%= time_field start => '23:59:59', id => 'foo'
Generate time input element. Previous input values will automatically get
picked up and shown as default.
<input name="start" type="time" />
<input name="start" type="time" value="23:59:59" />
<input id="foo" name="start" type="time" value="23:59:59" />
=head2 C<url_field>
%= url_field 'address'
%= url_field address => 'http://mojolicio.us'
%= url_field address => 'http://mojolicio.us', id => 'foo'
Generate url input element. Previous input values will automatically get
picked up and shown as default.
<input name="address" type="url" />
<input name="address" type="url" value="http://mojolicio.us" />
<input id="foo" name="address" type="url" value="http://mojolicio.us" />
=head2 C<week_field>
%= week_field 'vacation'
%= week_field vacation => '2012-W17'
%= week_field vacation => '2012-W17', id => 'foo'
Generate week input element. Previous input values will automatically get
picked up and shown as default.
<input name="vacation" type="week" />
<input name="vacation" type="week" value="2012-W17" />
<input id="foo" name="vacation" type="week" value="2012-W17" />
=head1 METHODS
L<Mojolicious::Plugin::TagHelpers> inherits all methods from
L<Mojolicious::Plugin> and implements the following new ones.
=head2 C<register>
$plugin->register(Mojolicious->new);
Register helpers in L<Mojolicious> application.
=head1 SEE ALSO
L<Mojolicious>, L<Mojolicious::Guides>, L<http://mojolicio.us>.
=cut