How to add a custom content at the end of the HTML <head> section

dmitry_fedyuk · December 20, 2015, 5:59pm

You can add a custom content inside the head.additional block. See an example:

magento/magento2/blob/2.0.0/app/code/Magento/Catalog/view/frontend/layout/catalog_product_opengraph.xml#L13-L17


<referenceBlock name="head.additional">
    <block class="Magento\Catalog\Block\Product\View" name="opengraph.general" template="Magento_Catalog::product/view/opengraph/general.phtml">
        <block class="Magento\Directory\Block\Currency" name="opengraph.currency" as="meta.currency" template="Magento_Catalog::product/view/opengraph/currency.phtml"/>
    </block>
</referenceBlock>

How it works:

github.com

magento/magento2/blob/2.0.0/lib/internal/Magento/Framework/View/Result/Page.php#L234


{
    $this->pageConfig->publicBuild();
    if ($this->getPageLayout()) {
        $config = $this->getConfig();
        $this->addDefaultBodyClasses();
        $addBlock = $this->getLayout()->getBlock('head.additional'); // todo
        $requireJs = $this->getLayout()->getBlock('require.js');
        $this->assign([
            'requireJs' => $requireJs ? $requireJs->toHtml() : null,
            'headContent' => $this->pageConfigRenderer->renderHeadContent(),
            'headAdditional' => $addBlock ? $addBlock->toHtml() : null,
            'htmlAttributes' => $this->pageConfigRenderer->renderElementAttributes($config::ELEMENT_TYPE_HTML),
            'headAttributes' => $this->pageConfigRenderer->renderElementAttributes($config::ELEMENT_TYPE_HEAD),
            'bodyAttributes' => $this->pageConfigRenderer->renderElementAttributes($config::ELEMENT_TYPE_BODY),
            'loaderIcon' => $this->getViewFileUrl('images/loader-2.gif'),
        ]);


        $output = $this->getLayout()->getOutput();
        $this->assign('layoutContent', $output);
        $output = $this->renderPage();
        $this->translateInline->processResponseBody($output);

github.com

magento/magento2/blob/2.0.0/app/code/Magento/Theme/view/base/templates/root.phtml#L15


*/


// @codingStandardsIgnoreFile


?>
<!doctype html>
<html <?php /* @escapeNotVerified */ echo $htmlAttributes ?>>
   <head <?php /* @escapeNotVerified */ echo $headAttributes ?>>
       <?php /* @escapeNotVerified */ echo $requireJs ?>
       <?php /* @escapeNotVerified */ echo $headContent ?>
       <?php /* @escapeNotVerified */ echo $headAdditional ?>
   </head>
   <body data-container="body" data-mage-init='{"loaderAjax": {}, "loader": { "icon": "<?php /* @escapeNotVerified */ echo $loaderIcon; ?>"}}' <?php /* @escapeNotVerified */ echo $bodyAttributes ?>>
       <?php /* @escapeNotVerified */ echo $layoutContent ?>
   </body>
</html>

dmitry_fedyuk · March 23, 2016, 4:15pm