How to add/update custom cart item data in the cart page - wordpress

Question

I want to add a comment to individual products in the cart page. I am new to woocommerce wordpress plugin so I have no idea how to do.
I have done some research. In that tutorial, I found that I can use woocommerce_add_cart_item_data hook this way:
add_filter( 'woocommerce_add_cart_item_data', 'add_comment', 10, 3 );
function add_comment( $cart_item_data, $product_id, $variation_id ) {
$cart_item_data['comment'] = 'This is comment';
return $cart_item_data;
}
but this does not work in my case.
I attach the Cart page image so you can understand.
I hope you guys understand what I want?
Thank you.

Answer 1

Below code will add a custom text to an item in cart:
You need to create a custom field "comment" for the product to use it here.
add_filter( 'woocommerce_add_cart_item_data', 'add_comment', 10, 3 );
function add_comment( $cart_item_data, $product_id, $variation_id ) {
$cart_item_data['comment'] = 'This is comment';
return $cart_item_data;
}
Add a Custom text/comment before Cart table in Cart Page:
add_action( 'woocommerce_before_cart_table', 'add_comment' );
function add_comment()
{
echo '<div class="woocommerce-info">This is comment</div>';
}
Add a Custom text/comment after Cart table in Cart Page:
add_action( 'woocommerce_after_cart_table', 'add_comment' );
function add_comment() {
echo '<div class="woocommerce-info">This is comment</div>';
}
HOW TO ADD AN INPUT FIELD TO WOOCOMMERCE CART ITEMS & Let users update input fields in the cart
https://pluginrepublic.com/how-to-add-an-input-field-to-woocommerce-cart-items/
Refer this link for a working solution to similar request:
https://stackoverflow.com/a/21818028/12291365
If you are okay with using the plugin, then this plugin will do the trick:
https://wordpress.org/plugins/wc-fields-factory/

Answer 2

Use code snippet below for adding custom values for each cart item.
Please add your logic for attaching values for each item
// Add custom value into cart item
add_filter('woocommerce_add_cart_item_data','sub_add_item_data',1,2);
if(!function_exists('sub_add_item_data'))
{
function sub_add_item_data($cart_item_data,$product_id)
{
// use condition for adding custom value here
$new_value = array(
'sub_custom_value' => 'custom value',
);
return array_merge($cart_item_data,$new_value);
}
}
// Extract custom values
add_filter('woocommerce_get_cart_item_from_session', 'sub_get_cart_items_from_session', 1, 3 );
if(!function_exists('sub_get_cart_items_from_session'))
{
function sub_get_cart_items_from_session($item,$values,$key)
{
if (array_key_exists( 'sub_custom_value', $values ) )
{
$item['sub_custom_value'] = $values['sub_custom_value'];
}
return $item;
}
}
// display in cart and checkout
add_filter('woocommerce_checkout_cart_item_quantity','sub_add_user_custom_option_from_session_into_cart',1,3);
add_filter('woocommerce_cart_item_price','sub_add_user_custom_option_from_session_into_cart',1,3);
if(!function_exists('sub_add_user_custom_option_from_session_into_cart'))
{
function sub_add_user_custom_option_from_session_into_cart($product_name, $values, $cart_item_key )
{
if(isset( $values['sub_custom_value'] ) && '' != $values['sub_custom_value'] )
{
$return_string = $product_name . "</a><dl class='variation'>";
$return_string .= "<table class='sub_options_table' id='" . $values['product_id'] . "'>";
$return_string .= "<tr><td>" . $values['sub_custom_value'] . "</td></tr>";
$return_string .= "</table></dl>";
return $return_string;
}
else
{
return $product_name;
}
}
}