Learn Web Development with Python

Custom tags

Django templates offer a versatile set of built-in tags. It is quite easy to create your own custom tag. Since custom tags live inside an app, create a templatetags directory inside an app. This directory must be a package, so it should have an (empty) __init__.py file.

Next, write your custom template in an appropriately named Python file. For example, for this active link pattern, we can create a file called nav.py with the following contents:

# app/templatetags/nav.py 
from django.core.urlresolvers import resolve 
from django.template import Library 
 
register = Library() 
@register.simple_tag 
def active_nav(request, url): 
    url_name = resolve(request.path).url_name 
    if url_name == url: 
        return "active" 
    return "" 

This file defines ...