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Applying classes and attributes to navigation under certain depth conditions
{#
/**
* @file
* Theme override to display a menu.
*
* Available variables:
* - menu_name: The machine name of the menu.
* - items: A nested list of menu items. Each menu item contains:
* - attributes: HTML attributes for the menu item.
* - below: The menu item child items.
* - title: The menu link title.
* - url: The menu link url, instance of \Drupal\Core\Url
* - localized_options: Menu link localized options.
* - is_expanded: TRUE if the link has visible children within the current
* menu tree.
* - is_collapsed: TRUE if the link has children within the current menu tree
* that are not currently visible.
* - in_active_trail: TRUE if the link is in the active trail.
*/
#}
{% import _self as menus %}
{#
We call a macro which calls itself to render the full tree.
@see http://twig.sensiolabs.org/doc/tags/macro.html
#}
{{ menus.menu_links(items, attributes, 0) }}
{% macro menu_links(items, attributes, menu_level) %}
{% import _self as menus %}
{%
set wrapper_classes = [
(menu_level == 0) ? 'primary-nav__menu js-menu',
(menu_level == 1) ? 'primary-nav__submenu',
(menu_level == 2) ? 'primary-nav__tertmenu',
]
%}
{% if items %}
<ul class="{{ wrapper_classes|join(' ') }}">
{% for item in items %}
{%
set classes = [
(menu_level == 0) ? 'primary-nav__item',
(menu_level == 1) ? 'primary-nav__subitem',
(menu_level == 2) ? 'primary-nav__tertitem',
(menu_level == 0 and item.below) ? 'has-submenu js-has-submenu',
(menu_level == 0 and item.url.options.attributes['data-highlight']) ? 'has-highlight',
item.in_active_trail ? 'active-trail',
item.in_active_trail ? 'is-active',
]
%}
<li{{ item.attributes.addClass(classes) }}>
{{ link(item.title, item.url) }}
{% if item.below %}
{{ menus.menu_links(item.below, attributes, menu_level + 1) }}
{% endif %}
</li>
{% endfor %}
</ul>
{% endif %}
{% endmacro %}
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