And the following ugly loop adds scripts as I hoped simple
concatenation would:
def render(self, context):
for i in range(0, len(self.scripts)):
context['scripts'].insert(i, self.scripts[i])
return ''
Thomas
On May 18, 2:31 pm, Thomas Allen <thomasmal...@gmail.com> wrote:
> 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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