Bivio::UI::HTML::Widget::ScriptOnly
# Copyright (c) 2001 bivio Software, Inc. All rights reserved.
# $Id$
package Bivio::UI::HTML::Widget::ScriptOnly;
use strict;
use Bivio::Base 'Bivio::UI::Widget';
# C<Bivio::UI::HTML::Widget::ScriptOnly> java script only widget rendering.
#
#
#
# widget : Bivio::UI::Widget (required)
#
# The widget to render when javascript is present.
#
# alt_widget : Bivio::UI::Widget []
#
# The widget which is rendered if javascript is not present.
my($_IDI) = __PACKAGE__->instance_data_index;
sub initialize {
# (self) : undef
# Preparse the widget during startup.
my($self) = @_;
$self->get('widget')->put(parent => $self)->initialize;
$self->get('alt_widget')->put(parent => $self)->initialize
if $self->unsafe_get('alt_widget');
return;
}
sub new {
# (proto) : Widget.ScriptOnly
# Creates a new ScriptOnly widget.
my($self) = shift->SUPER::new(@_);
$self->[$_IDI] = {};
return $self;
}
sub render {
# (self, any, string_ref) : undef
# Draws the widget on the buffer so that it will only be rendered if
# javascript is present.
my($self, $source, $buffer) = @_;
$$buffer .= <<'EOF';
<script type="text/javascript">
<!--
EOF
# draw the javascript text within a document.write()
my($str) = '';
$self->get('widget')->render($source, \$str);
# escape single quotes, escape < and / per w3 validator
$str =~ s|([ # ensure it is one line
$str =~ s|\n| |g;
$$buffer .= "document.write('".$str."');
// -->
</script>";
if ($self->unsafe_get('alt_widget')) {
$$buffer .= "\n<noscript>\n";
$self->get('alt_widget')->render($source, $buffer);
$$buffer .= "\n</noscript>\n";
}
return;
}
1;