[django] javascript widget factory

__init__.py

javascript_widget_factory.py

"""
Inserts JavaScript, rendered with the context built from a widget's attributes,
after a widget's rendered HTML.
"""

from django.forms.widgets import Widget
from django.template import Template
from django.template.context import Context
from django.utils.safestring import mark_safe

def javascript_widget_factory(script, base_cls=Widget):
    class _JavaScriptWidget(base_cls):
        _script_template = Template(script)

        def render(self, name, value, attrs=None, choices=()):
            str = super(_JavaScriptWidget, self).render(name, value, attrs, choices)
            str_js = self._script_template.render(Context(attrs))
            return mark_safe(str + '<script type="text/javascript">' + str_js + '</script>')
    return _JavaScriptWidget