I would like to be able to allow any template file to add its own
JavaScript. Seemed like an easy implementation:
class AddScriptNode(Node):
def __init__(self, scripts=[]):
self.scripts = scripts
def render(self, context):
context['scripts'] = self.scripts + context['scripts']
return ''
@register.tag
def add_scripts(parser, token):
bits = list(token.split_contents())
if len(bits) > 1:
return AddScriptNode(bits[1:])
else:
return AddScriptNode()
{% add_scripts moo moo-more nativelib pnc %}
Note that I add the existing scripts to the end of the added scripts
because templates seem to be evaluated bottom-to-top, meaning a simple
extend() call would cause the sub-template scripts to be at the
beginning of the list (no good).
The trouble is that this code clobbers context['scripts'] each time
render() is called. I have no idea why that is, because if I replace
that line with:
context['scripts'].extend(self.scripts)
then the scripts are added to the end, and nothing is clobbered. The
same goes for the equivalent:
context['scripts'] += self.scripts
This makes no sense to me. What's going on here?
Thomas
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