Orsdxy

After I updated from Magento version 2.2.3 to 2.2.6 the shopping cart stopped clearing after I click "Clear Shopping Cart" on the cart page.

After I click the button, the page reloads but everything remains the same.

I am using Ultimo theme but I have checked and it doesn't overwrite this behavior anyhow.

What could be the possible issue and where should I start my investigation from?

I've also encountered this issue and I've found out that in vendor/magento/module-checkout/view/frontend/templates/cart/form.phtml ~line 27, Magento Team seems missed to put a dot for the 'action' classname. It's a small mistake that creates a big problem. Hopefully this will be fixed in 2.2.7

So from

action.clear

It should be

.action.clear

Note: Please don't edit the file in vendor/magento/module-checkout/view/frontend/templates/cart/form.phtml directly.

When a user clicks on Clear Shopping Cart button then you have to check below:

• On click on this button the
  http://{Example.com}/checkout/cart/updatePost/ should hit.


• 
  

  This URL must hit via POST request.

  
  
  

  This post request must have form_key and update_cart_action, and update_cart_action value should be empty_cart

  
  

FORM DATA should like when to click on Clear Shopping Cart

form_key: 4VQpuhYHzS9dOY3P

cart[15][qty]: 1

cart[17][qty]: 1

update_cart_action: empty_cart

Where 15,17 are cart item id.

If those are available or exist then the exception is not happening.
You check error, check the exception log or changes

$this->messageManager->addException($exception, __('We can't update the shopping cart.'));

to

$this->messageManager->addError($exception->getMessage()

The Problem is 'update_cart_action' Parameter is not sending because Mageno developers added 'Magento_Checkout/js/action/update-shopping-cart' js function for validation. They Submit the form in this file. So the submit button value param is not sending. Add the hidden field with submit button name in

Magento_Checkout/templates/cart/item/form.phtml





<input type="hidden" id="update_cart_action_hidden" name="update_cart_action" value="">

And assign the value of submit button using onClick event to the hidden field

$('.update-cart-action').click(function(){

     $('#update_cart_action_hidden').val($(this).val());

});

Hope this will work

Checkout Cart Page >> Clear Shopping Cart button should have alert to the users if they want to clear or not.

Here I am overriding form.phtml in my theme.

app/design/frontend/Namespace/yourthemename/Magento_Checkout/templates/cart/form.phtml

form.phtml

<?php

/**

 * Copyright © Magento, Inc. All rights reserved.

 * See COPYING.txt for license details.

 */



// @codingStandardsIgnoreFile



/**  @var $block MagentoCheckoutBlockCartGrid */

?>

<?php $mergedCells = ($this->helper('MagentoTaxHelperData')->displayCartBothPrices() ? 2 : 1); ?>

<?= $block->getChildHtml('form_before') ?>

<form action="<?= /* @escapeNotVerified */ $block->getUrl('checkout/cart/updatePost') ?>"

          method="post"

          id="form-validate"

          data-mage-init='{"Magento_Checkout/js/action/update-shopping-cart":

              {"validationURL" : "/checkout/cart/updateItemQty"}

          }'

          class="form form-cart">

    <?= $block->getBlockHtml('formkey') ?>

    <div class="cart table-wrapper<?= $mergedCells == 2 ? ' detailed' : '' ?>">

        <?php if ($block->getPagerHtml()): ?>

            <div class="cart-products-toolbar cart-products-toolbar-top toolbar" data-attribute="cart-products-toolbar-top"><?= $block->getPagerHtml() ?></div>

        <?php endif ?>

        <table id="shopping-cart-table"

               class="cart items data table"

               data-mage-init='{"shoppingCart":{"emptyCartButton": ".action.clear",

               "updateCartActionContainer": "#update_cart_action_container"}}'>

            <caption role="heading" aria-level="2" class="table-caption"><?= /* @escapeNotVerified */ __('Shopping Cart Items') ?></caption>

            <thead>

                <tr>

                    <th class="col item" scope="col"><span><?= /* @escapeNotVerified */ __('Item') ?></span></th>

                    <th class="col price" scope="col"><span><?= /* @escapeNotVerified */ __('Price') ?></span></th>

                    <th class="col qty" scope="col"><span><?= /* @escapeNotVerified */ __('Qty') ?></span></th>

                    <th class="col subtotal" scope="col"><span><?= /* @escapeNotVerified */ __('Subtotal') ?></span></th>

                </tr>

            </thead>

            <?php foreach ($block->getItems() as $_item): ?>

                <?= $block->getItemHtml($_item) ?>

            <?php endforeach ?>

        </table>

        <?php if ($block->getPagerHtml()): ?>

            <div class="cart-products-toolbar cart-products-toolbar-bottom toolbar" data-attribute="cart-products-toolbar-bottom"><?= $block->getPagerHtml() ?></div>

        <?php endif ?>

    </div>

    <div class="cart main actions">

        <?php if ($block->getContinueShoppingUrl()): ?>

            <a class="action continue"

               href="<?= $block->escapeUrl($block->getContinueShoppingUrl()) ?>"

               title="<?= $block->escapeHtml(__('Continue Shopping')) ?>">

                <span><?= /* @escapeNotVerified */ __('Continue Shopping') ?></span>

            </a>

        <?php endif; ?>

        <button type="button"

                title="<?php echo $block->escapeHtml(__('Clear Shopping Cart')); ?>"

                class="action clear" id="cp-empty_cart_button">

            <span><?php /* @escapeNotVerified */

                echo __('Clear Shopping Cart'); ?></span>

        </button>

        <button type="submit"

                name="update_cart_action"

                data-cart-empty=""

                value="empty_cart"

                title="<?= $block->escapeHtml(__('Clear Shopping Cart')) ?>"

                class="action clear" id="empty_cart_button" style="display: none;">

            <span><?= /* @escapeNotVerified */ __('Clear Shopping Cart') ?></span>

        </button>

        <button type="submit"

                name="update_cart_action"

                data-cart-item-update=""

                value="update_qty"

                title="<?= $block->escapeHtml(__('Update Shopping Cart')) ?>"

                class="action update">

            <span><?= /* @escapeNotVerified */ __('Update Shopping Cart') ?></span>

        </button>

        <input type="hidden" value="" id="update_cart_action_container" data-cart-item-update=""/>

    </div>

</form>

<?= $block->getChildHtml('checkout.cart.order.actions') ?>

<?= $block->getChildHtml('shopping.cart.table.after') ?>

<script type="text/javascript">

    require([

        'jquery',

        'Magento_Ui/js/modal/alert',

        'Magento_Ui/js/modal/confirm'

    ], function ($, alertt, confirmation) {

        $(document).ready(function () {

            $('.cp-action-accept').parents('aside').addClass('confirm');

            $('#cp-empty_cart_button').on('click', function (event) {

                event.preventDefault();

                confirmation({

                    title: '',

                    content: 'Are you sure to remove products from cart ?',

                    actions: {

                        confirm: function () {

                            window.location.href = '<?php /* @escapeNotVerified */ echo $block->getUrl('checkout/cart/updatePost'); ?>';

                        },

                        cancel: function () {

                        }

                    },

                    buttons: [{

                        text: $.mage.__('OK'),

                        class: 'action secondary cp-action-accept',

                        /**

                         * Click handler.

                         */

                        click: function (event) {

                            this.closeModal(event, true);

                            $('#empty_cart_button').trigger('click');

                        }

                    },

                        {

                            text: $.mage.__('Cancel'),

                            class: 'action secondary action-dismiss',

                            /**

                             * Click handler.

                             */

                            click: function (event) {

                                this.closeModal(event);

                            }

                        }

                    ]

                });

            });

        });

    });

</script>

Output will be like this :-

Its a default bug in Magento2 version :
https://github.com/magento/magento2/issues/18475

To resolve this issue you need to override the file

vendor/magento/module-checkout/view/frontend/templates/cart/form.phtml

into your theme

app/design/frontend/{PackgageName}/{ThemeName}/Magento_Checkout/templates/cart/from.phtml

and change the line number 27 from action.clear to .action.clear