Here is a Django template tag that allows you to create complex variables specified in JSON format within a template.
It enables you to do stuff like:
{% var as person %}
{
"firstName": "John",
"lastName": "Smith",
"address": {
"streetAddress": "21 2nd Street",
"city": "New York",
"state": "NY",
"postalCode": 10021
},
"phoneNumbers": [
"212 555-1234",
"646 555-4567"
]
}
{% endvar %}
<p>{{person.firstName}}, </br>
{{person.address.postalCode}}, </br>
{{person.phoneNumbers.1}}
</p>
This tag also enables me to do dynamic CSS using as follows:
# urlpatters
urlpatterns = patterns('',
(r'^css/(?P<path>.*\.css)$', 'get_css'),
)
#views
def get_css(request, path):
return render_to_response('css/%s' % path, {},
mimetype="text/css; charset=utf-8")
# dynamic css within in /path/to/app/templates/css'
{% load var %}
{% var as col %}
{
"darkbg": "#999",
"lightbg": "#666"
}
{% endvar %}
{% var as dim %}
{
"thinmargin": "2em",
"thickmargin": "10em"
}
{% endvar %}
body {
background: {{col.darkbg}};
margin: {{dim.thinmargin}};
}
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 | from django import template
from django.utils import simplejson
import re
register = template.Library()
class VariablesNode(template.Node):
def __init__(self, nodelist, var_name):
self.nodelist = nodelist
self.var_name = var_name
def render(self, context):
source = self.nodelist.render(context)
context[self.var_name] = simplejson.loads(source)
return ''
@register.tag(name='var')
def do_variables(parser, token):
try:
tag_name, arg = token.contents.split(None, 1)
except ValueError:
msg = '"%s" tag requires arguments' % token.contents.split()[0]
raise template.TemplateSyntaxError(msg)
m = re.search(r'as (\w+)', arg)
if m:
var_name, = m.groups()
else:
msg = '"%s" tag had invalid arguments' % tag_name
raise template.TemplateSyntaxError(msg)
nodelist = parser.parse(('endvar',))
parser.delete_first_token()
return VariablesNode(nodelist, var_name)
|
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