How to create a breadcrumb with KNP Menu Bundle 2? - symfony

Question

So I have a menu built as shown in the example below:
<?php namespace AppBundle\Menu;
use Doctrine\ORM\EntityManager;
use Knp\Menu\FactoryInterface;
use Knp\Menu\MenuFactory;
class AdminMenuBuilder
{
public function sidebarMenu(FactoryInterface $factory, array $options)
{
$menu = $factory->createItem('root', array(
'navbar' => true,
'childrenAttributes' => [
'class' => 'nav main-menu',
],
));
$menu->addChild('Dashboard')
->setAttributes([
'icon' =>'fa fa-dashboard',
'class' => 'dropdown',
'dropdown' => true
]);
$menu['Dashboard']->addChild('Details', ['route' => 'app.admin.dashboard']);
$menu['Dashboard']->addChild('Details 2', ['route' => 'app.admin.dashboard']);
$menu->addChild('Users', ['route' => 'app.admin.dashboard.users'])
->setAttribute('icon', 'fa fa-users');
return $menu;
}
}
How can I create a breadcumb using KNPMenuBundle v2? I'm using symfony2 2.7.5

Answer 1

KnpMenuBundle 2.1.0 (released some weeks ago) has a knp_menu_get_breadcrumbs_array() function which you can use. For instance:
{% set item = knp_menu_get('some_menu_item') %}
{% set breadcrumbs = knp_menu_get_breadcrumbs_array(item) %}
{% for breadcrumb in breadcrumbs %}
{{ breadcrumb.label }}
{% endfor %}

Answer 2

If you have nested menu the above solution won't work. Here is the extension that returns array of active menu items recursively:
<?php
namespace AnalyticsBundle\Twig;
use Knp\Menu\ItemInterface;
use Knp\Menu\Matcher\MatcherInterface;
use Knp\Menu\Twig\Helper;
/**
* Class MenuExtension
* #package AnalyticsBundle\Twig
*/
class MenuExtension extends \Twig_Extension
{
private $helper;
private $matcher;
public function __construct(Helper $helper, MatcherInterface $matcher)
{
$this->helper = $helper;
$this->matcher = $matcher;
}
public function getFunctions()
{
return [
new \Twig_SimpleFunction('analytics_get_current_menu_items', function($menu, array $path = array(), array $options = array()) {
$menu = $this->helper->get($menu, $path, $options);
return $this->getCurrentItems($menu);
}),
];
}
private function getCurrentItems(ItemInterface $item)
{
$items = [];
$getActiveItems = function (ItemInterface $item) use (&$getActiveItems, &$items) {
if ($this->matcher->isCurrent($item)) {
$items[] = $item;
foreach ($item->getChildren() as $child) {
$getActiveItems($child);
}
}
};
$getActiveItems($item);
return $items;
}
public function getName()
{
return 'analytics_menu';
}
}
Example usage:
<ul class="page-breadcrumb">
{% for item in analytics_get_current_menu_items('main') %}
<li>
<span>{{ item.label }}</span>
{% if not loop.last %}
|
{% endif %}
</li>
{% endfor %}
</ul>