How to render a block's child?

dmitrii_fediuk · March 23, 2016, 8:27am

Use the \Magento\Framework\View\Element\AbstractBlock::getChildHtml() method:

magento/magento2/blob/28f2d03/lib/internal/Magento/Framework/View/Element/AbstractBlock.php#L481-L508


/**
 * Retrieve child block HTML
 *
 * @param   string $alias
 * @param   boolean $useCache
 * @return  string
 */
public function getChildHtml($alias = '', $useCache = true)
{
    $layout = $this->getLayout();
    if (!$layout) {
        return '';
    }
    $name = $this->getNameInLayout();
    $out = '';
    if ($alias) {
        $childName = $layout->getChildName($name, $alias);
        if ($childName) {
            $out = $layout->renderElement($childName, $useCache);
        }
    } else {
        foreach ($layout->getChildNames($name) as $child) {
            $out .= $layout->renderElement($child, $useCache);
        }
    }


    return $out;
}

A usage example

github.com

magento/magento2/blob/28f2d03/app/code/Magento/Backend/Block/System/Cache/Edit.php#L49-L55


/**
 * @return string
 */
public function getSaveButtonHtml()
{
    return $this->getChildHtml('save_button');
}