WooCommerce Price overriding not working - php

Question

I have set up a hidden input item using woocommerce_before_add_to_cart_button hook
function add_gift_wrap_field() {
?>`<input type="hidden" id="price_val" name="added_price" value="100.34">`<?php
}
add_action( 'woocommerce_before_add_to_cart_button', 'add_gift_wrap_field' );
Saving fields against the product:
function save_gift_wrap_fee( $cart_item_data, $product_id ) {
if( isset( $_POST['added_price'] ) ) {
$cart_item_data = array();
$cart_item_data[ "gift_wrap_fee" ] = "YES";
$cart_item_data[ "gift_wrap_price" ] = 100;
}
return $cart_item_data;
}
add_filter( 'woocommerce_add_cart_item_data', 'save_gift_wrap_fee', 99, 2 );
Now I can echo out the $_POST['added_price'] inside this woocommerce_before_calculate_totals hook.
The code I written is shown below:
function calculate_gift_wrap_fee( $cart_object ) {
if( !WC()->session->__isset( "reload_checkout" )) {
/* Gift wrap price */
$additionalPrice = number_format($_POST['added_price'], 2);
$additionalPrice = floatval($additionalPrice);
//echo $additionalPrice; exit(); shows the value
foreach ( $cart_object->cart_contents as $key => $value ) {
if( isset( $value["gift_wrap_fee"] ) ) {
/* Woocommerce 3.0 + */
$orgPrice = floatval( $value['data']->get_price() );
$value['data']->set_price( $orgPrice + $additionalPrice ); //not adding the $additionalPrice here.
}
}
}
}
add_action( 'woocommerce_before_calculate_totals', 'calculate_gift_wrap_fee', 99 );
What am I doing wrong here?

Answer 1

Here is the complete clean, tested and working solution based on your code question.
Here I have included your custom field key/value in the cart object for the related cart item, instead of getting the Post value in your calculate_gift_wrap_fee() function.
This way it's not possible to loose the custom field value and the new price calculation is reliable.
I have commented 'gift_wrap_fee' and 'gift_wrap_price' as they are not really needed now (but you can uncomment them if you like).
Here is this code:
// The hidden product custom field
add_action( 'woocommerce_before_add_to_cart_button', 'add_gift_wrap_field' );
function add_gift_wrap_field() {
?>
<input type="hidden" id="price_val" name="added_price" value="100.34">
<?php
}
// Adding the custom field to as custom data for this cart item in the cart object
add_filter( 'woocommerce_add_cart_item_data', 'save_custom_fields_data_to_cart', 10, 2 );
function save_custom_fields_data_to_cart( $cart_item_data, $product_id ) {
$bool = false;
$data = array();
if( ! empty( $_REQUEST['added_price'] ) ) {
$cart_item_data['custom_data']['added_price'] = $_REQUEST['added_price'];
// Below this 2 values are not really needed (I think)
// (You can uncomment them if needed)
## $cart_item_data['custom_data']['gift_wrap_fee'] = 'YES';
## $cart_item_data['custom_data']['gift_wrap_price'] = 100;
// below statement make sure every add to cart action as unique line item
$cart_item_data['custom_data']['unique_key'] = md5( microtime().rand() );
WC()->session->set( 'custom_data', $data );
}
return $cart_item_data;
}
// Changing the cart item price based on custom field calculation
add_action( 'woocommerce_before_calculate_totals', 'calculate_gift_wrap_fee', 10, 1 );
function calculate_gift_wrap_fee( $cart ) {
if ( is_admin() && ! defined( 'DOING_AJAX' ) )
return;
if ( did_action( 'woocommerce_before_calculate_totals' ) >= 2 )
return;
// Iterating though cart items
foreach ( $cart->get_cart() as $cart_item ) {
// Continue if we get the custom data for the current cart item
if( ! empty( $cart_item['custom_data'] ) ){
// Get the custom field "added price" value
$added_price = number_format( $cart_item['custom_data']['added_price'], 2 );
// The WC_Product object
$product = $cart_item['data'];
// Get the price (WooCommerce versions 2.5.x to 3+)
$product_price = method_exists( $product, 'get_price' ) ? floatval(product->get_price()) : floatval($product->price);
// New price calculation
$new_price = $product_price + $added_price;
// Set the calculeted price (WooCommerce versions 2.5.x to 3+)
method_exists( $product, 'set_price' ) ? $product->set_price( $new_price ) : $product->price = $new_price;
}
}
}
Code goes in function.php file of your active child theme (or theme) or also in any plugin file.
This code is tested and works on WooCommerce versions from 2.5.x to 3+.