The counter initializes the variable to 0, and next it increments one by one:
{% load counter_tag %}
{% for pet in pets %}
{% if pet.is_cat %}
{% counter cats %}
{% else %}
{% counter dogs %}
{% endif %}
{% endfor %}
# cats: {{cats}}
# dogs: {{dogs}}
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 | from django import template
register = template.Library()
@register.tag(name='counter')
def do_counter(parser, token):
try:
tag_name, args = token.contents.split(None, 1)
except ValueError:
raise template.TemplateSyntaxError("'counter' node requires a variable name.")
return CounterNode(args)
class CounterNode(template.Node):
def __init__(self, varname):
self.varname = varname
def render(self, context):
try:
var = template.resolve_variable(self.varname, context)
except:
var = 0
deep = len(context.dicts)-1
context.dicts[deep][self.varname] = var+1
return ''
|
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