The price that being displayed on the Cart page is $180.00 rather than being $18.00.
I cannot find why the function below is as if almost multiplying itself by 2 then multiplying by the price of the gram.
The amount of grams is multiplying by 2 and then multiplying by the price per gram.
If I set the script to + instead of * I get 10 + 10 + 1.80…
// Add a product custom field “grams_quantity” that will update the displayed price
add_action(‘woocommerce_before_add_to_cart_button’, ‘special_product_by_grams’, 25);
function special_product_by_grams(){
global $product;
// HERE Define the special product IDs sold by grams
$targeted_product_ids = array(1372);
// or HERE Define a product categories (ids, slugs or names)
$categories = array('research-chemicals');
// Only for products sold by gram
$product_id = $product->get_id();
if ( ! ( in_array( $product_id, $targeted_product_ids ) || has_term( $categories, 'product_cat', $product_id ) ) ) return;
?>
<div class="grams-field">
<label for="grams_quantity"><?php _e('Grams: ','woocoomerce'); ?><span></span><br>
<input type="number" step="1" name="grams_quantity" class="grams_quantity" id="grams_quantity" value="1">
</label>
</div><br>
<script type="text/javascript">
(function($){
// variables initialization
var priceByGram = <?php echo wc_get_price_to_display( $product ); ?>,
currencySymbol = $(".woocommerce-Price-currencySymbol").html(),
updatedPrice;
// On live event: imput number fields
$('input#grams_quantity').on( "click blur", function(){
updatedPrice = ($(this).val() * priceByGram).toFixed(2);
$(".woocommerce-Price-amount.amount").html('<span class="woocommerce-Price-amount amount">'+currencySymbol+ +updatedPrice+'</span>');
console.log("event"); // <== To be removed
});
})(jQuery);
</script>
<?php
}
// Save the “grams_quantity” custom product field data in Cart item
add_filter( ‘woocommerce_add_cart_item_data’, ‘save_in_cart_the_custom_product_field’, 10, 2 );
function save_in_cart_the_custom_product_field( $cart_item_data, $product_id ) {
if( isset( $_POST[‘grams_quantity’] ) ) {
$cart_item_data[ ‘grams_quantity’ ] = $_POST[‘grams_quantity’];
// When add to cart action make an unique line item
$cart_item_data['unique_key'] = md5( microtime().rand() );
WC()->session->set( 'custom_data', $_POST['grams_quantity'] );
}
return $cart_item_data;
}
// Update product price by grams in cart and checkout
add_filter( ‘woocommerce_before_calculate_totals’, ‘update_prices_by_gram’, 10, 1 );
function update_prices_by_gram( $cart_object ) {
// HERE Define the special product IDs sold by grams
$targeted_product_ids = array(1372);
// or HERE Define a product categories (ids, slugs or names)
$categories = array('research-chemicals');
foreach ( $cart_object->get_cart() as $cart_item ) {
// Only for products sold by gram
$product_id = $cart_item['product_id'];
if ( in_array( $product_id, $targeted_product_ids ) || has_term( $categories, 'product_cat', $product_id ) ){
// Get an instance of the WC_Product object and the
$product = $cart_item['data'];
$grams = $cart_item['grams_quantity'];
// Method is_on_sale() manage everything (dates…)
$product->set_price( $product->get_price() * $grams);
}
}
}
// Render “grams_quantity” the custom product field in cart and checkout
add_filter( ‘woocommerce_get_item_data’, ‘render_product_custom_field_meta_on_cart_and_checkout’, 10, 2 );
function render_product_custom_field_meta_on_cart_and_checkout( $cart_data, $cart_item ) {
$custom_items = array();
if( !empty( $cart_data ) )
$custom_items = $cart_data;
if( isset( $cart_item['grams_quantity'] ) )
$custom_items[] = array(
'name' => __( 'Grams', 'woocommerce' ),
'value' => sanitize_text_field( $cart_item['grams_quantity'] ),
'display' => sanitize_text_field( $cart_item['grams_quantity'] ),
);
return $custom_items;
}
// Save “grams_quantity” to the order items meta data
add_action(‘woocommerce_add_order_item_meta’,‘add_product_custom_fiel_to_order_item_meta’, 1, 3 );
function add_product_custom_fiel_to_order_item_meta( $item_id, $item_values, $item_key ) {
if( isset( $item_values['grams_quantity'] ) )
wc_update_order_item_meta( $item_id, 'Grams', sanitize_text_field( $item_values['grams_quantity'] ) );
}