This tag is inspired by how ng-class works in AngularJS. https://docs.angularjs.org/api/ng/directive/ngClass
example:
context = {
'context_var': True,
'context_var_2': 'a'
}
{% classes "class_name_1": context_var == True, "class_name_2": context_var_2 == "a", "class_name_3": False %}
output: class_name_1 class_name_2
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 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 | from django.template import Library, Node
from django.template.defaulttags import TemplateIfParser
from django.template.base import TemplateSyntaxError, VariableDoesNotExist
register = Library()
def parse_classes(parser, content):
classes_and_conditions = []
classes_splitted = content.split(",")
for class_value in classes_splitted:
class_parts = class_value.split(":")
if len(class_parts) != 2:
raise TemplateSyntaxError("class must contain a name and condition")
classes_and_conditions.append({
'name': class_parts[0].replace("'", "").replace('"', "").strip(),
'condition': TemplateIfParser(parser, class_parts[1].strip().split(" ")).parse()
})
return classes_and_conditions
class Classes(Node):
classes = None
def __init__(self, classes):
self.classes = classes
def render(self, context):
classes_to_show = []
for class_parts in self.classes:
try:
if class_parts['condition'].eval(context):
classes_to_show.append(class_parts['name'])
except VariableDoesNotExist:
pass
return " ".join(classes_to_show)
def classes(parser, token):
bits = token.split_contents()
if len(bits[1:]) < 1:
raise TemplateSyntaxError("'%s' takes at least one argument" % bits[0])
offset = len(bits[0]) + 1
return Classes(parse_classes(parser, token.contents[offset:]))
register.tag(classes)
|
More like this
- Template tag - list punctuation for a list of items by shapiromatron 9 months ago
- JSONRequestMiddleware adds a .json() method to your HttpRequests by cdcarter 9 months, 1 week ago
- Serializer factory with Django Rest Framework by julio 1 year, 4 months ago
- Image compression before saving the new model / work with JPG, PNG by Schleidens 1 year, 4 months ago
- Help text hyperlinks by sa2812 1 year, 5 months ago
Comments
Please login first before commenting.