Is it possible to create a template tag that will create a list that a
for loop can loop over? I know I can create a template tag that will
store the list in a variable and then iterate over that variable. I
want to do it in one step.
For example the template tag with be “list_print” that will create a
list. I want something like the following in the template:
{% for a in list_print %}
Below is my code. When I call it the loop never iterates.
@register.tag(name="list_print")
def do_list_print(parser, token):
#test that don't have arguments
try:
tokenList = token.split_contents()
except Exception:
raise template.TemplateSyntaxError("%r tag throw unexpected
exception(token.split_contents)" % token.contents.split()[0])
if len(tokenList)>1:
raise template.TemplateSyntaxError("%r tag does not take
arguments" % token.contents.split()[0])
return ListPrintNode()
class ListPrintNode(Node):
"""
thread safe version based on CycleNode from
https://docs.djangoproject.com/en/dev/howto/custom-template-tags/
"""
def __init__(self):
self.myList = ['a', 'b']
def render(self, context):
if self not in context.render_context:
context.render_context[self] =
itertools.cycle(self.myList)
cycle_iter = context.render_context[self]
return cycle_iter.next()
Brian
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