How to access project configuration parameters from javascript in Symfony2 - symfony

Question

I'm using Symfony 2.1 dev and looking for easiest way to get parameter from app/config/parameters.yml (ini).
Simple example:
I have record in parameters.yml
parameters:
url: "http://domain.com"
Then i want to use it somehow in static js file
var url = "{{ app.url }}"; // trying to avoid hardcode
This token should be replaced by actual value from coonfig after
app/console assetic:dump
So final js will have
var url = "http://domain.com";
Currently i'm thinking about writing my own console command but firstly i want to ensure there is no any standard way of doing such things in Symfony2 or maybe some bundle that can halp me?
UPDATE: i'd like to do this with AsseticBundle, like YUI and LESS
assetic:
debug: %kernel.debug%
use_controller: false
write_to: %kernel.root_dir%/../web
filters:
cssrewrite: ~
lessphp: ~
yui_js:
jar: "%kernel.root_dir%/Resources/java/yuicompressor-2.4.6.jar"
yui_css:
jar: %kernel.root_dir%/Resources/java/yuicompressor-2.4.6.jar
to add another one filter which will replace token {{ app.url }} in js file to actual "http://domain.com"

Answer 1

A simple solution would be to reference your parameters in the twig globals:
parameters:
url: "http://domain.com"
an_array:
twig: "is cool"
and: "symfony2 to"
twig:
globals:
app_parameters:
url: %url%
an_array: %an_array%
Then in your template:
<script>
window.parameters = {{ app_parameters|json_encode|raw }};
</script>
would render something like:
<script>
window.parameters = {"url":"http://domain.com","an_array":{"twig":"is cool","and":"symfony2 to"}};
</script>