TYPO3 Core

Hi Altan,

Thanks for your report. For my information. How is your setup and situation? I just tried and could only get this (when:

- Language mode is fallback
- Default language is set as fallback
- There is a page record for default language and for alternative language
- Content in default language and no content in alternative language

So we have a page record but no content for that page. You can set all page properties of the alternative language. You can even decide that you have content for specific colPosses, but not for all. So only empty columns will have a fallback. It is very hard to decide which language code and canonical you need to set in those situations.

How do you see this? When do we set the canonical and language to the fallback language?

I locally fixed this in the beforeGeneratingCanonical signal using the following code in the attached zip.
This function checks if the displayed language content differs from the selected language. If so, writes the canonical url.

It could be directly in CanonicalGenerator as:

    /**
     * @param  string  $href
     * @return array
     */
    public function checkForActiveLanguageFallback(string &$href): array
    {
        $languageId = $this->languageAspect->getId();
        if ($languageId > 0 && $this->languageAspect->getContentId() !== $languageId) {
            return $this->typoScriptFrontendController->cObj->typoLink_URL([
                'parameter' => $this->typoScriptFrontendController->id . ',' . $this->typoScriptFrontendController->type,
                'forceAbsoluteUrl' => true,
                'additionalParams' => '&L=' . $this->languageAspect->getContentId(),
                'addQueryString' => true,
                'addQueryString.' => [
                    'method' => 'GET',
                    'exclude' => implode(
                        ',',
                        CanonicalizationUtility::getParamsToExcludeForCanonicalizedUrl(
                            (int)$this->typoScriptFrontendController->id,
                            (array)$GLOBALS['TYPO3_CONF_VARS']['FE']['additionalCanonicalizedUrlParameters']
                        )
                    ),
                ],
            ]);
        }

        return '';
    }

With https://review.typo3.org/c/Packages/TYPO3.CMS/+/67574 a hreflang tag is rendered for fallback languages even when no page record is translated. This makes sure those pages are not marked as duplicate content. This way you don't have nasty conditions to check if a page has translated content on it etc. If you want to alter the defined hreflang tags, you can use the ModifyHrefLangTagsEvent. See https://docs.typo3.org/m/typo3/reference-coreapi/master/en-us/ApiOverview/Hooks/Events/Frontend/ModifyHrefLangTagsEvent.html for more information in 10.4. In version 9, you can disable the automatic hreflang tag generation and use your own implementation. For 9.5 you can find more information on https://docs.typo3.org/c/typo3/cms-seo/9.5/en-us/Configuration/Index.html#hreflang-tags