breadcrumbs.md

The Breadcrumb Component

The breadcrumb maps a list of route to a list of link. The component works in conjuction with the Sidebar Navigation component.

Event Listener

You don't need to build an event listener as long as you've already made it with the Sidebar Navigation component. You will reuse this listener to build the Breadcrumb list of links.

Service.xml

Finally, you need to attach your new listener to the event system:

XML:

	<!-- Resources/config/services.xml -->
	<parameters>
		<!-- ... -->
		<parameter key="my_admin_bundle.breadcrumb_listener.class">MyAdminBundle\EventListener\MyMenuItemListListener</parameter>
		<!-- ... -->
	</parameters>
	<services>
		<!-- ... -->
		<service id="my_admin_bundle.breadcrumb_listener" class="%my_admin_bundle.breadcrumb_listener.class%">
	        <tag name="kernel.event_listener" event="theme.breadcrumb" method="onSetupMenu" />
	    </service>

		<!-- ... -->
	</services>

YAML:

	parameters:
		# ...
        my_admin_bundle.breadcrumb_listener.class: MyAdminBundle\EventListener\MyMenuItemListListener
    
    services:
        # ...
        my_admin_bundle.breadcrumb_listener:
            class: %my_admin_bundle.breadcrumb_listener.class%
            tags:
                - { name: kernel.event_listener, event:theme.breadcrumb, method:onSetupMenu }

As you can see we are using the menu listener from the Sidebar Navigation but attaching to the theme.breadcrumb event.