WooCommerce programmatically deleting from cart - ajax

Question

How do I programmatically remove an item from the Woocommerce cart using AJAX? I tried putting a function in my functions.php file and accessing that but nothing gets deleted. I tried hard-coding product 299 but it doesn't delete. Here's what I did:
functions.php
function remove_item_from_cart() {
$cart = WC()->instance()->cart;
$id = 299;
$cart_id = $cart->generate_cart_id($id);
$cart_item_id = $cart->find_product_in_cart($cart_id);
if($cart_item_id){
$cart->set_quantity($cart_item_id, 0);
}
return true;
}
themes/mine/main.js
$.ajax({
type: 'POST',
dataType: 'text',
url: "http://www.../wp/wp-content/themes/mine/functions.php",
data: {
action: 'remove_item_from_cart'
},
success: function( data ) {
console.log(data);
}
});

Answer 1

Use proper ajax method of wordpress like this: This worked fine for me.
//functions.php
function remove_item_from_cart() {
$cart = WC()->instance()->cart;
$id = $_POST['product_id'];
$cart_id = $cart->generate_cart_id($id);
$cart_item_id = $cart->find_product_in_cart($cart_id);
if($cart_item_id){
$cart->set_quantity($cart_item_id, 0);
return true;
}
return false;
}
add_action('wp_ajax_remove_item_from_cart', 'remove_item_from_cart');
add_action('wp_ajax_nopriv_remove_item_from_cart', 'remove_item_from_cart');
//main.js
$.ajax({
type: "POST",
url: 'http://localhost/your_site/wp-admin/admin-ajax.php',
data: {action : 'remove_item_from_cart','product_id' : '4'},
success: function (res) {
if (res) {
alert('Removed Successfully');
}
}
});

Answer 2

This seems to work.
HTML:
<?php
foreach ( WC()->cart->get_cart() as $cart_item_key => $cart_item ){
?<
<button class="remove-item" data-cart-item-key="<?=$cart_item_key;?>">
remove item
</button>
<?
}
?>
Javascript:
$('.remove-item').click(function(e){
e.preventDefault();
$.ajax({
type: "POST",
url: ajaxurl,
data: {
action: 'remove_item_from_cart',
'cart_item_key': String($(this).data('cart-item-key'))
}
});
});
In functions.php, inside the template folder:
function remove_item_from_cart() {
$cart_item_key = $_POST['cart_item_key'];
if($cart_item_key){
WC()->cart->remove_cart_item($cart_item_key);
return true;
}
return false;
}
add_action('wp_ajax_remove_item_from_cart', 'remove_item_from_cart');
add_action('wp_ajax_nopriv_remove_item_from_cart', 'remove_item_from_cart');

Answer 3

For WooCommerce 3.0+ you can do it using the built-in remove_cart_item() function
function findCartItemKey($cartItems, $productId){
foreach($cartItems as $cartKey => $item){
$product = $item['data'];
if($product->get_id() == $productId){
return $cartKey;
}
return false;
}
}
global $woocommerce;
$cartItemKey = findCartItemKey($woocommerce->cart->get_cart())
$woocommerce->cart->remove_cart_item($cartItemKey);