Am 24.10.2010 14:24 schrieb [email protected]:
In my attempts to solve this problem, I'd also tried to write a custom
decorator to do this ... but didn't get that to work for a variety of
reasons - some certainly due to the fact that I don't yet understand
TurboGears fully enough! ;)
I think the real problem is that this stuff is not yet documented good
enough. How about the following solution?
-----------------------------------------------------------
from tg import json_encode, tmpl_context
from tg.decorators import Decoration
from tg.render import _get_tg_vars
class expose_jsonp(object):
def __init__(self, callback=None, exclude_names=None):
if callback is None:
callback = 'callback'
if exclude_names is None:
exclude_names = []
if 'tmpl_context' not in exclude_names:
exclude_names.append('tmpl_context')
self.callback = callback
self.exclude_names = exclude_names
self.exclude_callback = 'callback' in exclude_names
def before_validate(self, remainder, params):
if self.exclude_callback:
tmpl_context.callback = self.callback
else:
tmpl_context.callback = params.pop(
'callback', self.callback)
def __call__(self, func):
deco = Decoration.get_decoration(func)
deco.register_hook(
'before_validate', self.before_validate)
deco.register_template_engine(
'text/javascript; charset=utf-8',
'jsonp', '', self.exclude_names)
return func
def render_jsonp(template_name, template_vars, **kwargs):
callback = tmpl_context.callback
for key in _get_tg_vars():
del template_vars[key]
return '%s(%s)' % (callback, json_encode(template_vars))
from myapp.config.app_cfg import base_config
base_config.render_functions['jsonp'] = render_jsonp
-----------------------------------------------------------
You can provide a default name for the callback in the decorator that
can be overwritten by the client with the "callback" parameter unless
you set exclude_names=['callback'].
-- Christoph
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