cms_menus.py

from cms.cms_menus import Modifier
from cms.cms_menus import menu_pool

from cms.models import Page


class Level(Modifier):
    post_cut = True

    def modify(self, request, nodes, namespace, root_id, post_cut, breadcrumb):
        if breadcrumb:
            return nodes
        for node in nodes:
            if not node.parent:
                if post_cut:
                    node.menu_level = 0
                else:
                    node.level = 0
                self.mark_levels(node, post_cut)
        return nodes

    def mark_levels(self, node, post_cut):
        for child in node.children:
            if post_cut:
                child.menu_level = node.menu_level + 1
            else:
                child.level = node.level + 1
            self.mark_levels(child, post_cut)

menu_pool.register_modifier(Level)

menu.html

{% load i18n menu_tags cache %}


{% for child in children %}
    <li class="{% if child.ancestor %}ancestor{% endif %}
        {% if child.selected %} active{% endif %}
        {% if child.children %} dropdown{% endif %}">
        {% if child.children %}
            <a class="dropdown-toggle" data-toggle="dropdown" href="#">
                {{ child.get_menu_title }} <span class="caret"></span>
            </a>
            <ul class="dropdown-menu">
                {{ child.level }}
                {% show_menu from_level to_level extra_inactive extra_active template "" "" child %}
            </ul>
        {% else %}

                <a href="{{ child.get_absolute_url }}" class="{{ child.level }}"><span>{{ child.get_menu_title }}</span></a>
        {% endif %}
    </li>
    {% if class and forloop.last and not forloop.parentloop %}{% endif %}
{% endfor %}