README

This bundle enhances the handling of html <head> section tags. It provides services to update head tags dynamically from your code.

Features

Provide a nice api to set head tags like meta, title, base, link
Sets important meta tags like og:title, og:description, og:url and twitter:card out of the box
Allow setting open graph and twitter fallback image on root page
Allow setting twitter author per root page

Usage

Setup

Install with composer
Update your database
Set following config variables (if you don't need the legacy implementation)
```
huh_head:
  use_contao_head: true
  use_contao_variables: true
```
Optional: Set fallback image and twitter author in root page(s)

Set head content

Currently, there are two ways to update head tags, as we are in progress of refactoring this bundle to use a better approach. This section describes the new/modern way, currently available for meta tags and base tag. For the legacy way see the next chapters.

To set base tag and meta tags, use the HtmlHeadTagManager service:

use HeimrichHannot\HeadBundle\HeadTag\BaseTag;
use HeimrichHannot\HeadBundle\HeadTag\MetaTag;
use HeimrichHannot\HeadBundle\HeadTag\Meta\CharsetMetaTag;
use HeimrichHannot\HeadBundle\HeadTag\Meta\HttpEquivMetaTag;
use HeimrichHannot\HeadBundle\HeadTag\Meta\PropertyMetaTag;
use HeimrichHannot\HeadBundle\Manager\HtmlHeadTagManager;
use Symfony\Component\HttpFoundation\Request;

class SomeEventListener
{
    private HtmlHeadTagManager $headTagManager;

    public function updateBaseTag(Request $request): void
    {
        // Set base tag to null to remove it
        $this->headTagManager->setBaseTag(null);
        
        //Set base tag from object or url
        $this->headTagManager->setBaseTag(new BaseTag($request->getSchemeAndHttpHost()));
        $this->headTagManager->setBaseTag('https://example.org'));
    }
    
    public function setMetaTags(): void
    {
        // Add a new meta tag. If a tag with the same name already exists, it will be overridden
        $this->headTagManager->addMetaTag(new MetaTag('author', 'John Doe'));
        
        // Get an existing tag
        $description = ($tag = $this->headTagManager->getMetaTag('og:description')) ? $tag->getContent() : '';
        $this->headTagManager->removeMetaTag('twitter:site');
        
        // Create a tag for property meta tags
        $this->headTagManager->addMetaTag(new PropertyMetaTag('og:type', 'article'));
        
        // Create a http-equiv tag
        $this->headTagManager->addMetaTag(new HttpEquivMetaTag('refresh', '30'));
        
        // Set a charset tag
        $this->headTagManager->addMetaTag(new CharsetMetaTag('UTF-8'));
        
        // Create tags without class (usefull when creating tags in a loop without custom checks)
        $this->headTagManager->addMetaTag(
            $this->headTagManager->getHeadTagFactory()->createMetaTag('description', 'Lorem ipsum!')
        );
        $this->headTagManager->addMetaTag(
            $this->headTagManager->getHeadTagFactory()->createTagByName('meta_og:url', 'https://example.org')
        );
    }
}

Other tags (legacy)

This section describe the current usage for setting tags other than base or meta tags. This is the legacy implementation that should be replaced in the future.

Each meta tags is registered as a symfony service. Get the service and set the content, that's it.

Example <meta name="date">

/** @var ContainerInterface $container */
$container->get('huh.head.tag.meta_date')->setContent(\Date::parse('c', time()));

Available Tags (legacy)

The container parameter huh.head.tags contains a list of all available tag services from the list below.

/** @var ContainerInterface $container */
#available-tags->getParameter('huh.head.tags')

tag	setter
`<title>My site title</title>`	`$container->get('huh.head.tag.title')->setContent('My site title')`
`<link rel="prev" href="http://heimrich-hannot.de/list?page_n199=1">`	`$container->get('huh.head.tag.link_prev')->setContent('http://heimrich-hannot.de/list?page_n199=1')`
`<link rel="next" href="http://heimrich-hannot.de/list?page_n199=3">`	`$container->get('huh.head.tag.link_next')->setContent('http://heimrich-hannot.de/list?page_n199=3')`
`<link rel="canonical" href="http://heimrich-hannot.de/site-name">`	`$container->get('huh.head.tag.link_canonical')->setContent('http://heimrich-hannot.de/site-name')`

Custom Tags (legacy)

If you want to register your custom tag, add create a class that implements the TagInterface and extends from one of the Abstract Tag classes like AbstractSimpleTag.

In your bundle services.yml register your tag:

services:
    huh.head.tag.meta_custom:
      class: HeimrichHannot\HeadBundle\Tag\Simple\MetaCustom
      public: true
      arguments: ['@huh.head.tag_manager']

To set the tag content, simply call:

$container->get('huh.head.tag.meta_custom')->setContent('FOO');

Legacy integration

Be sure, huh_head.use_contao_head and/or huh_head.use_contao_variables are not set to true.

Output $this->meta() in your fe_page template ()

<?php $this->block('meta'); ?>
    <?= $this->meta(); ?>
<?php $this->endblock(); ?>

Make sure, that you remove (are outputted by $this->meta() if huh_head.use_contao_head not true):

<meta charset="<?= $this->charset ?>">
<title><?= $this->title ?></title>
<base href="<?php echo $this->base; ?>">
<meta name="robots" content="<?= $this->robots ?>">
<meta name="description" content="<?= $this->description ?>">

The meta function accepts currently one parameter that can contain service names (array) that should be skipped.

Developers

Backend field

Get tag options for a select field. If you want to define options by your own, prepend meta tag options with meta_.

use HeimrichHannot\HeadBundle\Helper\DcaHelper;

class HeadTagOptionsListener {
    private DcaHelper $dcaHelper;

    public function __invoke() {
        return $this->dcaHelper->getTagOptions([
            // filter: (array|null) If set, only tags fulfill given filters will be returned. See FILTER constants for available options. Default null
            'filter' => [DcaHelper::FILTER_META, DcaHelper::FILTER_TITLE],
            // skip_tags: (array) Skip specific tags. Default empty
            'skip_tag' => ['og:locale'],
        ]);
    }
}

Example how to evaluate field values:

use Contao\ContentModel;
use HeimrichHannot\HeadBundle\Manager\HtmlHeadTagManager;

class SomeEventListener {
    private HtmlHeadTagManager $headTagManager;
    
    public function __invoke(ContentModel $contentModel){
        $tag = $this->headTagManager->getHeadTagFactory()->createTagByName($contentModel->headTag);
        if ($tag) {
            $tag->setAttribute("content", $contentModel->headTagContent);
            $this->headTagManager->addTag($tag);
        }
    }
}

Config reference

# Default configuration for extension with alias: "huh_head"
huh_head:

    # Use the default head variables for title,base,robots and description instead of removing them from the page template.
    use_contao_head:      false

    # Use the default contao template variables for outputting head tags instead of the meta function.
    use_contao_variables: false

heimrichhannot / contao-head-bundle

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