I want to use javascript in custom Symfony 2 form field type extension. So, I have Twig extension template like this:

{% block some_widget %}
    <input ... />

    <script src="some.js"></script>
    <link href="some.css" />
{% endblock %}

But I want to have these script and link tags only once in my HTML, ideally in head tag, without modifing base template. I tried to extend Twig blocks, but I have no access to action template blocks inside form template. Or maybe something like this:

{# widget tempate #}
{% block some_widget %}
    <input ... />

    {{ use_javascript('some.js') }}
    {{ use_css('some.css') }}
{% endblock %}

{# main action template #}
...
<head>
{{ dump_javascripts() }}
{{ dump_css() }}
</head>
...

How to do this with Symfony 2 Forms + Twig?

P.S. Sorry for my bad english.

forms symfony twig
Edit
Report