前台获取显示可配置产品库存

app/code/[Vendor]/[Module]/Helper/Stock.php


<?php
namespace [Vendor]\[Module]\Helper;

class Stock extends \Magento\Framework\App\Helper\AbstractHelper
{
    /**
     * @var Magento\CatalogInventory\Api\StockStateInterface
     */
    protected $stockState;

    /**
     * Output constructor.
     * @param \Magento\Framework\App\Helper\Context $context
     * @param \Magento\CatalogInventory\Api\StockStateInterface $stockState
     */
    public function __construct(
        \Magento\Framework\App\Helper\Context $context,
        \Magento\CatalogInventory\Api\StockStateInterface $stockState
    ) {
        $this->stockState = $stockState;
        parent::__construct($context);
    }

    /**
     * Retrieve stock qty whether product
     *
     * @param int $productId
     * @param int $websiteId
     * @return float
     */
    public function getStockQty($product, $websiteId = null)
    {
        $_productId = $product->getId();
        if($product->getTypeId() != 'configurable') {
            return $this->stockState->getStockQty($_productId, $websiteId);
        }
        $objectManager = \Magento\Framework\App\ObjectManager::getInstance();
        $configProduct = $objectManager->create('Magento\Catalog\Model\Product')->load($_productId);

        $_children = $configProduct->getTypeInstance()->getUsedProducts($configProduct);

        $_stockQty = 0;

        foreach ($_children as $child){
            $_stockQty += $this->stockState->getStockQty($child->getId(), $websiteId);
        }
        return $_stockQty;
    }
}

在可获取产品信息的ptml文件中


<?php
$_product = $block->getProduct();

$_helperStock = $this->helper([Vendor]\[Module]\Helper\Stock::class);

echo $_helperStock->getStockQty($_product, $_product->getStore()->getWebsiteId());

?>