django-activeurl 0.1.5

Features

• automatic highlighting of currently active <a> tags via CSS class

• automatic highlighting of parent <a> tags for menus

• removes boring / hardcoded stuff from your life!

Usage

After loading the template library via

{% load activeurl %}

the following code snippet will be rendered like this if request.full_path() starts with /some_page/:

{% activeurl %}
    <ul>
        <li> <!-- this <li> will render as <li class="active"> -->
            <a href="/some_page/">
                some_page
            </a>
        </li>
        <li>
            <a href="/another_page/">
                another_page
            </a>
        </li>
    </ul>
{% endactiveurl %}

Note: The content of {% activeurl %}…{% endactiveurl %} must have valid root tag (i.e. <ul> or <div>, etc) – otherwise an exception will be raised.

Installation

Python 2.6, 2.7, 3.2, 3.3 and PyPy 1.9 are supported.

1. Install the stable version using pip:

   pip install django-activeurl

   or install the in-development version using pip:

   pip install -e git+git://github.com/hellysmile/django-activeurl#egg=django_activeurl

2. In your settings.py add the following:

   INSTALLED_APPS = (
       ...
       'django_activeurl',
       ...
   )
   
   TEMPLATE_CONTEXT_PROCESSORS = (
       ...
       'django.core.context_processors.request',
       ...
   )

3. The lxml library is required and thus additional libraries need to be installed to build it:

   • Ubuntu:

     sudo apt-get install libxml2 libxml2-dev libxslt-dev build-essential python-dev
     sudo ldconfig

   • Fedora:

     sudo yum groupinstall 'Development Tools'
     sudo yum install libxslt-devel libxml2 libxml2-devel python-devel
     sudo ldconfig

   • MacOS X:

     brew install libxml2 libxslt
     sudo update_dyld_shared_cache -force

   • Windows: A pre-built lxml binary can be found here

   • Clouds: There’s a 99.99% chance that lxml will build out of the box.

Options

{% activeurl menu="yes" parent_tag="div" %}
    <div>
        <div>  <!-- This will render as <div class="active"> -->
            <a href="/menu/">
                menu
            </a>
            <div>  <!-- This will also render as <div class="active"> -->
                <a href="/menu/submenu/">
                    submenu
                </a>
            </div>
        </div>
    </div>
{% endactiveurl %}

{% activeurl menu="no" parent_tag="div" %}
    <div>
        <div>
            <a href="/menu/">
                menu
            </a>
        </div>
        <div>
            <a href="/menu/submenu/">
                submenu
            </a>
        </div>
    </div>
{% endactiveurl %}

Configuration

The default options can be set in settings.py as well:

ACTIVE_URL_KWARGS = {
    'css_class': 'active',
    'parent_tag': 'li',
    'menu': 'yes'
}
ACTIVE_URL_CACHE = True
ACTIVE_URL_CACHE_TIMEOUT = 60 * 60 * 24  # 1 day
ACTIVE_URL_CACHE_PREFIX = 'django_activeurl'

By default django-activeurl will try to retrieve a previously rendered HTML node from Django’s caching backend before active URLs are looked for and a new HTML tree is built. You can disable the cache with ACTIVE_URL_CACHE = False.

In addition, ACTIVE_URL_CACHE_TIMEOUT can be used to define a timeout for keys to expire. The default value is one day.

The last configuration option is ACTIVE_URL_CACHE_PREFIX (which is django_activeurl by default) and defines which name to use in Django’s caching backend.

Tests

pip install tox
tox

Jinja2

Vanilla Jinja2 configuration:

from jinja2 import Environment

from django_activeurl.ext.django_jinja import ActiveUrl
from django_activeurl.ext.utils import options


env = Environment(
    extensions=[ActiveUrl]
)
env.globals['options'] = options

{% activeurl options(request, css_class="active", menu="yes", parent_tag="li") %}
    <ul>
        <li>
            <a href="/page/">page</a>
        </li>
        <li>
            <a href="/other_page/">other_page</a>
        </li>
    </ul>
{% endactiveurl %}

Except for request, options can be omitted.

If you’re using django-jinja, jingo or coffin you need to load the ActiveUrl extension and populate Environment() with options in settings.py.

Background

For building the HTML element tree django-activeurl uses lxml, which is one of the best HTML parsing tools around. More info and benchmarks can be found at habrahabr.ru (in russian). Note that there’s no content rebuilding inside the template tag when no active URLs are found, so there’s no impact on performance.

Credits

• initializr is used for the example HTML template.

• Simon Whitaker’s »Fork me« ribbon is used in the example.