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Manual Reference Pages  -  DATA::JAVASCRIPT::ANON (3)

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Data::JavaScript::Anon - Dump big dumb Perl structs to anonymous JavaScript structs



  # Dump an arbitrary structure to javascript
  Data::JavaScript::Anon->anon_dump( [ a, b, { a => 1, b => 2 } ] );


Data::JavaScript::Anon provides the ability to dump large simple data structures to JavaScript. That is, things that don’t need to be a class, or have special methods or whatever.

The method it uses is to write anonymous variables, in the same way you would in Perl. The following shows some examples.

  # Perl anonymous array
  [ 1, a, Foo Bar ]
  # JavaScript equivalent ( yes, its exactly the same )
  [ 1, a, Foo Bar ]
  # Perl anonymous hash
  { foo => 1, bar => bar }
  # JavaScript equivalent
  { foo: 1, bar: bar }

One advantage of doing it in this method is that you do not have to co-ordinate variable names between your HTML templates and Perl. You could use a simple Template Toolkit phrase like the following to get data into your HTML templates.

  var javascript_data = [% data %];

In this way, it doesn’t matter WHAT the HTML template calls a particular variables, the data dumps just the same. This could help you keep the work of JavaScript and Perl programmers ( assuming you were using different people ) seperate, without creating cross-dependencies between their code, such as variable names.

The variables you dump can also be of arbitrary depth and complexity, with a few limitations.
ARRAY and HASH only Since arrays and hashs are all that is supported by JavaScript, they are the only things you can use in your structs. Any references or a different underlying type will be detected and an error returned.

Note that Data::JavaScript::Anon will use the UNDERLYING type of the data. This means that the blessed classes or objects will be ignored and their data based on the object’s underlying implementation type.

This can be a positive thing, as you can put objects for which you expect a certain dump structure into the data to dump, and it will convert to unblessed, more stupid, JavaScript objects cleanly.

No Circular References Since circular references can’t be defined in a single anonymous struct, they are not allowed. Try something like Data::JavaScript instead. Although not supported, they will be detected, and an error returned.


All methods are called as methods directly, in the form Data::JavaScript::Anon->anon_dump( [ etc ] ).

    anon_dump STRUCT

The main method of the class, anon_dump takes a single arbitrary data struct, and converts it into an anonymous JavaScript struct.

If needed, the argument can even be a normal text string, although it wouldn’t do a lot to it. :)

Returns a string containing the JavaScript struct on success, or undef if an error is found.

var_dump CW$name, STRUCT

As above, but the var_dump method allows you to specify a variable name, with the resulting JavaScript being var name = struct;. Note that the method WILL put the trailing semi-colon on the string.

script_wrap CW$javascript

The script_wrap method is a quick way of wrapping a normal JavaScript html tag around your JavaScript.

is_a_number CW$scalar

When generating the javascript, numbers will be printed directly and not quoted. The is_a_number method provides convenient access to the test that is used to see if something is a number. The test handles just about everything legal in JavaScript, with the one exception of the exotics, such as Infinite, -Infinit and NaN.

Returns true is a scalar is numeric, or false otherwise.

You may also access method in using an instantiated object.

    new HASH

This will create a Data::JavaScript::Anon object that will allow you to change some of the default behaviors of some methods.

        quote_char  : Set the quote_char for stirng scalars. Default is ".


The following are a little less general, but may be of some use.

var_scalar CW$name, \$scalar

Creates a named variable from a scalar reference.

var_array CW$name, \@array

Creates a named variable from an array reference.

var_hash CW$name, \%hash

Creates a named variable from a hash reference.

    anon_scalar \$scalar

Creates an anonymous JavaScript value from a scalar reference.

    anon_array \@array

Creates an anonymous JavaScript array from an array reference.

    anon_hash \%hash

Creates an anonymous JavaScript object from a hash reference.

anon_hash_key CW$value

Applys the formatting for a key in a JavaScript object


Bugs should be reported via the CPAN bug tracker at:


For other comments or queries, contact the author.


Adam Kennedy <>


JSON, <>


Copyright 2003 - 2009 Adam Kennedy.

This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

The full text of the license can be found in the LICENSE file included with this module.

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perl v5.20.3 DATA::JAVASCRIPT::ANON (3) 2009-04-20

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