Configurable Product Qty not working in magento2?

Question

I want change qty box in dropdown .So I'm override template file./vendor/magento/module-catalog/view/frontend/layout/catalog_product_view.xml

<referenceBlock name="product.info.addtocart">
            <action method="setTemplate">
                <argument name="template" xsi:type="string">Www_QtyDropdown::product/view/addtocart.phtml</argument>
            </action>
        </referenceBlock> 

addtocart.phtml

    <?php $_product = $block->getProduct(); ?>
<?php $qty = $block->getStockMaximumQty(); ?>
<?php $buttonTitle = __('Add to Cart'); ?>
<?php if ($_product->isSaleable()): ?>
    <div class="box-tocart">
        <div class="fieldset">
            <?php if ($block->shouldRenderQuantity()): ?>
                <div class="field qty">
                    <label class="label" for="qty"><span><?= /* @escapeNotVerified */ __('Qty') ?></span></label>
                    <div class="control">
                        <select name="qty" id="qty" title="<?php /* @escapeNotVerified */ echo __('Qty') ?>" 
                                class="input-text qty" data-validate="<?php echo $block->escapeHtml(json_encode($block->getQuantityValidators())) ?>">
                                    <?php if ($qty > 4) { ?>
                                <option value = "0"></option>
                                <?php $i = 1; ?>                                
                                <?php while ($i <= 4) {
                                    ?>                            
                                    <option value="<?php echo $block->getProductDefaultQty() * $i; ?>"><?php echo $block->getProductDefaultQty() * $i; ?></option>
                                    <?php $i++; ?>
                                <?php } ?>
                            <?php } else {
                                ?>
                                <option value = "0"></option>
                                <?php $i = 1;
                                ?>
                                <?php while ($i <= $qty) { ?>
                                    <option value="<?php echo $block->getProductDefaultQty() * $i; ?>"><?php echo $block->getProductDefaultQty() * $i; ?></option>
                                    <?php $i++; ?>
                                <?php } ?>
                            <?php } ?>
                        </select>
                    </div>
                </div>
            <?php endif; ?>

But is not working for configurable product.If I need any modification in my code.

Answer 1

Ok, please try adding below code in catalog_product_view.xml:

<referenceBlock name="product.info.addtocart.additional">
       <action method="setTemplate">
          <argument name="template" xsi:type="string">Www_QtyDropdown::product/view/addtocart.phtml</argument>
       </action>
</referenceBlock>