# Navigation settings

## Create settings

The creation of settings is based on events.

Using an event subscriber, you can create settings and define how to edit them.
A setting's value is stored in json so a value could be a string, a boolean, an array, etc.

See the example below.

```php-inline title="src/EventSubscriber/NavigationSettingEventSubscriber.php"
namespace App\EventSubscriber;

use App\Core\Event\Setting\NavigationSettingEvent;
use App\Core\EventSubscriber\NavigationSettingEventSubscriber as EventSubscriber;
use App\Core\Setting\NavigationSettingManager;
use Symfony\Component\Form\Extension\Core\Type\TextType;
use Symfony\Component\Form\Extension\Core\Type\EmailType;

class NavigationSettingEventSubscriber extends EventSubscriber
{
    protected NavigationSettingManager $manager;

    public function __construct(NavigationSettingManager $manager)
    {
        $this->manager = $manager;
    }

    public function onInit(NavigationSettingEvent $event)
    {
        $data = $event->getData();
        $navigation = $data['navigation'];

        $this->manager->init($navigation, 'nav_tracker_code', 'Stats', 'Tracker', '');
        $this->manager->init($navigation, 'nav_contact_email', 'Contact', 'Email', 'foo@example.com');
    }

    public function onFormInit(NavigationSettingEvent $event)
    {
        $data = $event->getData();
        $builder = $data['builder'];
        $entity = $data['entity'];

        if (in_array($entity->getCode(), ['nav_tracker_code'])) {
            $builder->add(
                'value',
                TextType::class,
                [
                    'label' => $entity->getLabel(),
                ]
            );
        }

        if (in_array($entity->getCode(), ['nav_contact_email'])) {
            $builder->add(
                'value',
                EmailType::class,
                [
                    'label' => $entity->getLabel(),
                ]
            );
        }
    }
}
```
Result:

![](/_static/img/settings/03.png)

## Access settings

Settings are accessible using `App\Core\Setting\NavigationSettingManager` which is a service.

```php-inline title="src/Controller/FooController.php"
namespace App\Controller;

use App\Core\Setting\NavigationSettingManager;
use App\Core\Site\SiteRequest;
use Symfony\Component\HttpFoundation\Response;

class FooController
{
    public function foo(NavigationSettingManager $settingManager, SiteRequest $siteRequest): Response
    {
        $trackerCode = $settingManager->get($siteRequest->getNavigation(), 'nav_tracker_code');
        $contactEmail = $settingManager->get('my_nav', 'nav_contact_email');

        // ...
    }
}
```

In a template, you can use the function `navigation_setting`:

```twig
Tracker code: {{ navigation_setting(_navigation, 'nav_tracker_code') }}<br>
Contact email: {{ navigation_setting('my_nav', 'nav_contact_email') }}<br>
```

## Update settings

Settings are accessible using `App\Core\Setting\NavigationSettingManager` which is a service.

```php-inline title="src/Controller/FooController.php"
namespace App\Controller;

use App\Core\Setting\NavigationSettingManager;
use App\Core\Site\SiteRequest;
use Symfony\Component\HttpFoundation\Response;

class FooController
{
    public function foo(NavigationSettingManager $settingManager, SiteRequest $siteRequest): Response
    {
        $settingManager->set($siteRequest->getNavigation(), 'nav_tracker_code', '...');
        $settingManager->set('my_nav', 'nav_contact_email', '...');

        // ...
    }
}
```

You can also edit them from UI:

![](/_static/img/settings/04.png)