Trouble adding coupons and dynamic updating of totals to WooCommerce Mini-Cart - php

Question

UPDATE: This gets me closer, but the applying a coupon takes me to the cart page instead of updating within the mini-cart.
<form class="woocommerce-cart-form" action="<?php echo esc_url( wc_get_cart_url() ); ?>" method="post">
<table class="shop_table shop_table_responsive cart woocommerce-cart-form__contents" cellspacing="0">
<tbody>
<tr>
<td colspan="6" class="actions">
<?php if ( wc_coupons_enabled() ) { ?>
<div class="coupon">
<label for="coupon_code"><?php esc_html_e( 'Coupon:', 'woocommerce' ); ?></label> <input type="text" name="coupon_code" class="input-text" id="coupon_code" value="" placeholder="<?php esc_attr_e( 'Coupon code', 'woocommerce' ); ?>" /> <input type="submit" class="button" name="apply_coupon" value="<?php esc_attr_e( 'Apply coupon', 'woocommerce' ); ?>" />
<?php do_action( 'woocommerce_cart_coupon' ); ?>
</div>
<?php } ?>
</td>
</tr>
</tbody>
</table>
</form>
<div class="cart-collaterals">
<?php do_action( 'woocommerce_cart_collaterals' ); ?>
</div>
I'm trying to add the coupon functionality to the mini-cart.php template and running into issues. If I copy the core coupon functionality from cart.php, nothing happens when I apply a coupon. The expected behavior is for the coupon to apply and the total updated (all within the mini-cart). Here's my mini-cart.php file:
<?php
/**
* Mini-cart
*
* Contains the markup for the mini-cart, used by the cart widget.
*
* This template can be overridden by copying it to yourtheme/woocommerce/cart/mini-cart.php.
*
* HOWEVER, on occasion WooCommerce will need to update template files and you
* (the theme developer) will need to copy the new files to your theme to
* maintain compatibility. We try to do this as little as possible, but it does
* happen. When this occurs the version of the template file will be bumped and
* the readme will list any important changes.
*
* #see https://docs.woocommerce.com/document/template-structure/
* #author WooThemes
* #package WooCommerce/Templates
* #version 3.3.0
*/
if ( ! defined( 'ABSPATH' ) ) {
exit;
}
do_action( 'woocommerce_before_mini_cart' ); ?>
<?php if ( ! WC()->cart->is_empty() ) : ?>
<div class="mini-cart-header">
<div>Your Cart</div>
<i class="icon-close mini-cart-close"></i>
</div>
<ul class="woocommerce-mini-cart cart_list product_list_widget <?php echo esc_attr( $args['list_class'] ); ?>">
<?php
do_action( 'woocommerce_before_mini_cart_contents' );
foreach ( WC()->cart->get_cart() as $cart_item_key => $cart_item ) {
$_product = apply_filters( 'woocommerce_cart_item_product', $cart_item['data'], $cart_item, $cart_item_key );
$product_id = apply_filters( 'woocommerce_cart_item_product_id', $cart_item['product_id'], $cart_item, $cart_item_key );
if ( $_product && $_product->exists() && $cart_item['quantity'] > 0 && apply_filters( 'woocommerce_widget_cart_item_visible', true, $cart_item, $cart_item_key ) ) {
$product_name = apply_filters( 'woocommerce_cart_item_name', $_product->get_name(), $cart_item, $cart_item_key );
$thumbnail = apply_filters( 'woocommerce_cart_item_thumbnail', $_product->get_image(), $cart_item, $cart_item_key );
$product_price = apply_filters( 'woocommerce_cart_item_price', WC()->cart->get_product_price( $_product ), $cart_item, $cart_item_key );
$product_permalink = apply_filters( 'woocommerce_cart_item_permalink', $_product->is_visible() ? $_product->get_permalink( $cart_item ) : '', $cart_item, $cart_item_key );
?>
<li class="woocommerce-mini-cart-item <?php echo esc_attr( apply_filters( 'woocommerce_mini_cart_item_class', 'mini_cart_item', $cart_item, $cart_item_key ) ); ?>">
<?php if ( ! $_product->is_visible() ) : ?>
<?php echo str_replace( array( 'http:', 'https:' ), '', $thumbnail ) . '<div class="product-name">' . $product_name . '</div>' . '<div class="product-price"' . $product_price . '</div>' ?>
<?php else : ?>
<a href="<?php echo esc_url( $product_permalink ); ?>" class="product-info">
<?php echo str_replace( array( 'http:', 'https:' ), '', $thumbnail ) . '<div><div class="product-name">' . $product_name . '</div>' . '<div class="product-price"' . $product_price . '</div></div>' ?>
</a>
<?php endif; ?>
<?php echo wc_get_formatted_cart_item_data( $cart_item ); ?>
<?php
echo apply_filters( 'woocommerce_cart_item_remove_link', sprintf(
'<i class="icon-trash"></i>',
esc_url( wc_get_cart_remove_url( $cart_item_key ) ),
__( 'Remove this item', 'woocommerce' ),
esc_attr( $product_id ),
esc_attr( $cart_item_key ),
esc_attr( $_product->get_sku() )
), $cart_item_key );
?>
</li>
<?php
}
}
do_action( 'woocommerce_mini_cart_contents' );
?>
</ul>
<p class="woocommerce-mini-cart__total total"><strong><?php _e( 'Subtotal', 'woocommerce' ); ?>:</strong> <?php echo WC()->cart->get_cart_subtotal(); ?></p>
<?php if ( wc_coupons_enabled() ) { ?>
<div class="coupon">
<label for="coupon_code"><?php esc_html_e( 'Coupon:', 'woocommerce' ); ?></label> <input type="text" name="coupon_code" class="input-text" id="coupon_code" value="" placeholder="<?php esc_attr_e( 'Coupon code', 'woocommerce' ); ?>" /> <input type="submit" class="button" name="apply_coupon" value="<?php esc_attr_e( 'Apply coupon', 'woocommerce' ); ?>" />
<?php do_action( 'woocommerce_cart_coupon' ); ?>
</div>
<?php } ?>
<?php foreach ( WC()->cart->get_coupons() as $code => $coupon ) : ?>
<tr class="cart-discount coupon-<?php echo esc_attr( sanitize_title( $code ) ); ?>">
<th><?php wc_cart_totals_coupon_label( $coupon ); ?></th>
<td data-title="<?php echo esc_attr( wc_cart_totals_coupon_label( $coupon, false ) ); ?>"><?php wc_cart_totals_coupon_html( $coupon ); ?></td>
</tr>
<?php endforeach; ?>
<p class="woocommerce-mini-cart__total total"><strong><?php esc_attr_e( 'Total', 'woocommerce' ); ?>"><?php wc_cart_totals_order_total_html(); ?></p>
<?php do_action( 'woocommerce_widget_shopping_cart_before_buttons' ); ?>
<p class="woocommerce-mini-cart__buttons buttons"><?php do_action( 'woocommerce_widget_shopping_cart_buttons' ); ?></p>
<div>Related Products/Upsell</div>
<?php else : ?>
<p class="woocommerce-mini-cart__empty-message"><?php _e( 'No products in the cart.', 'woocommerce' ); ?></p>
<?php endif; ?>
<?php do_action( 'woocommerce_after_mini_cart' ); ?>