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NAME
CGI::Application::Plugin::JSON - easy manipulation of JSON headers
SYNOPSIS
use CGI::Application::Plugin::JSON ':all';
# add_json_header() is cumulative
$self->add_json_header( foo => 'Lorem ipsum...');
$self->add_json_header( bar => [ 0, 2, 3, 4 ] );
$self->add_json_header( baz => { stuff => 1, more_stuff => 2 } );
# json_header() is not cumulative
$self->json_header( foo => 'Lorem ipsum...');
# in case we're printing our own headers
print "X-JSON: " . $self->json_header_string();
# clear out everything in the outgoing JSON headers
$self->clear_json_header();
# check to see if there's a JSON header or body in play
return if $self->has_json();
# or send the JSON in the document body
$self->json_body( { foo => 'Lorem ipsum', bar => [ 0, 2, 3 ] } );
# send the JSON back in the document body, but execute it using a Javascript callback
$self->json_callback('alert', { foo => 'Lorem ipsum', bar => [ 0, 2, 3 ] } );
DESCRIPTION
When communicating with client-side JavaScript, it is common to send
data in "X-JSON" HTTP headers or through the document body as
content-type "text/x-json".
This plugin adds a couple of convenience methods to make that just a
little bit easier.
HEADER METHODS
json_header
This method takes name-value pairs and sets them to be used in the
outgoing JSON. It is not cummulative and works similarly to
"header_props". Use it only if you have all of the values up front. In
most cases add_json_header is probably what you want.
# only the 2nd call will actually set data that will be sent
$self->json_header( foo => 'Lorem ipsum...');
$self->json_header( bar => [ 0, 2, 3, 4 ] );
add_json_header
This method takes name-value pairs and sets them to be used in the
outgoing JSON. It is cummulative and works similarly to "header_add";
meaning multiple calls will add to the hash of outgoing values.
# both 'foo' and 'bar' will exist in the hash sent out
$self->json_header( foo => 'Lorem ipsum...');
$self->json_header( bar => [ 0, 2, 3, 4 ] );
clear_json_header
This method will remove anything that was previously set by both
json_header and add_json_header. This means that no "X-JSON" header will
be sent.
has_json
This method will check to see if there's a JSON header (or body) in play
and return true. This is useful in the case of wanting to skip shell
templates in a generic cgiapp_postrun method:
sub cgiapp_postrun {
my ( $self, $output_ref ) = @_;
return if $self->has_json();
# proceed w/ shell...
}
json_header_string
This method will create the actual HTTP header string that will be sent
to the browser. This plugin uses it internally to send the header, but
it might be useful to use directly if you are printing your own HTTP
headers (using a "header_type" of "none").
$self->header_type('none');
print $self->json_header_string();
json_header_value
This method will return the values being sent in the JSON header. If you
pass in the key of the value you want, you will get just that value.
Else all name-value pairs will be returned.
my $value = $self->json_header_value('foo');
my %values = $self->json_header_value();
BODY METHODS
json_body
This method will take the given Perl structure, turn it into JSON, set
the appropriate content-type, and then return the JSON.
return $self->json_body({ foo => 'stuff', bar => [0,1,2,3]} );
json_callback
This method will take the given Perl structure, turn it into JSON, set
the appropriate content-type, and then return a Javascript snippet where
the given callback is called with the resulting JSON.
return $self->json_callback('alert', { foo => 'stuff', bar => [0,1,2,3]} );
# would result in something like the following being sent to the client
alert({ foo => 'stuff', bar => [0,1,2,3]});
to_json
This method is just a convenient wrapper around JSON::Any's "encode".
from_json
This method is just a convenient wrapper around JSON::Any's "decode".
AUTHOR
Michael Peters, "<mpeters@plusthree.com>"
BUGS
Please report any bugs or feature requests to
"bug-cgi-application-plugin-viewsource@rt.cpan.org", or through the web
interface at
<http://rt.cpan.org/NoAuth/ReportBug.html?Queue=CGI-Application-Plugin-J
SON>. I will be notified, and then you'll automatically be notified of
progress on your bug as I make changes.
COPYRIGHT & LICENSE
Copyright 2006 Michael Peters, All Rights Reserved.
This program is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.
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