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ModifyHrefLangTagsEvent

New in version 10.3.

Event:

TYPO3\CMS\Frontend\Event\ModifyHrefLangTagsEvent

Description:

Event to alter the hreflang tags just before they get rendered.

The class TYPO3\CMS\Seo\HrefLang\HrefLangGenerator has been refactored to be a listener (identifier 'typo3-seo/hreflangGenerator') to the newly introduced event. This way the system extension seo still provides hreflang tags but it is now possible to simply register after or instead of the implementation.

Example

An example implementation could look like this:

EXT:my_extension/Configuration/Services.yaml

services:
  Vendor\MyExtension\HrefLang\EventListener\OwnHrefLang:
    tags:
      - name: event.listener
        identifier: 'my-ext/ownHrefLang'
        after: 'typo3-seo/hreflangGenerator'
        event: TYPO3\CMS\Frontend\Event\ModifyHrefLangTagsEvent

With after and before, you can make sure your own listener is executed after or before the given identifiers.

EXT:my_extension/Classes/HrefLang/EventListener/OwnHrefLang.php

namespace Vendor\MyExtension\HrefLang\EventListener;

use TYPO3\CMS\Frontend\Event\ModifyHrefLangTagsEvent;

class OwnHrefLang
{
   public function __invoke(ModifyHrefLangTagsEvent $event): void
   {
      $hrefLangs = $event->getHrefLangs();
      $request = $event->getRequest();

      // Do anything you want with $hrefLangs
      $hrefLangs = [
         'en-US' => 'https://example.org',
         'nl-NL' => 'https://example.org/nl'
      ];

      // Override all hrefLang tags
      $event->setHrefLangs($hrefLangs);

      // Or add a single hrefLang tag
      $event->addHrefLang('de-DE', 'https://example.org/de');
    }
}

API

class TYPO3\CMS\Frontend\Event\ModifyHrefLangTagsEvent

Listeners to this Event will be able to modify the hreflang tags that will be generated. You can use this when you have an edge case language scenario and need to alter the default hreflang tags.

getHrefLangs()

Return type

array

getRequest()

Return type

Psr\Http\Message\ServerRequestInterface

setHrefLangs(array hrefLangs)

Set the hreflangs. This should be an array in format:

[

'en-US' => 'https://example.com', 'nl-NL' => 'https://example.com/nl'

]

Parameters

• $hrefLangs (array) -- the hrefLangs

addHrefLang(string languageCode, string url)

Add a hreflang tag to the current list of hreflang tags

Parameters

• $languageCode (string) -- the languageCode

• $url (string) -- the url