I'm afraid this may be a plugin specific/related question, but maybe there are some more experienced TypoScript / Extensions programmers out there, who can give me a quick hint where to look at.
I'm using the gallery plugin YAG Gallery. For SEO purposes i`d like to have the additonal links in the header for the previous and next page of an itemList.
At the moment i achieved the following: In Classes/Controller/ItemListController.php i added the following lines to the function "listAction":
$pager = $this->extListContext->getPagerCollection();
$nextLinkUid = $pager->getNextPage();
$prevLinkUid = $pager->getPreviousPage();
$prev = '<link rel="prev" href="' . $prevLinkUid . '">';
$next = '<link rel="next" href="' . $nextLinkUid . '">';
$this->response->addAdditionalHeaderData($prev . PHP_EOL . $next);
With this i get two additional tags in the <head> section of my page with
<link rel="prev" href="1">
<link rel="next" href="2">
So far, so good - i have a the right entries and i have the page uids of the prev and the next link.
Does anyone have an idea how can i get the actual link in this place? like the one which is rendered within Resources/Private/Partials/Pager/Default.html
<f:if condition="{pager.showPreviousLink}">
<li class="previous">
<extlist:link.action controller="{controller}" action="{action}" arguments="{extlist:namespace.GPArray(object:'{pagerCollection}' arguments:'page:{pager.previousPage}')}"><span><</span></extlist:link.action>
</li>
</f:if>
What Action do i have to call from the controller to get a Link?
I assume I may have to use render from Classes/ViewHelpers/Link/ItemViewHelper.php in some way - but how? I can`t figure out how to transform the syntax from the Partial to some syntax i can call from within a controller.
For anyone wondering how i solved this:
Instead of using addAdditionalHeaderData i added header data via a fluid viewhelper directly within the partial: