Custom_WordPress_Fields_WooCommerce_Cart.php

<script type="text/javascript">
    jQuery(document).ready(function(){
        /*jQuery firing on add to cart button click*/
        jQuery('.single_add_to_cart_button').click(function(){
            /*Product meta data being sent; this is where you'd do your 
            document.getElementsByName or .getElementById*/
            var product-meta-data = 'product-meta-data';
            /*Ajax request URL being stored*/
            var ajaxurl = '<?php echo admin_url('admin-ajax.php'); ?>';
            jQuery.ajax({
                url: ajaxurl,
                type: "POST",
                data: {
                    //action name (must be consistent with your php callback)
                    action:'custom_data',
                    product-meta-data : product-meta-data,
                },
                async : false,
                success: function(data){
                    /*if sucessful alert us, show data sent to the server*/
                    alert("We did it" + data);
                }
            });
        })
    });
</script>
<?php
    add_action('wp_ajax_custom_data', 'custom_data_callback');
    add_action('wp_ajax_nopriv_custom_data', 'custom_data_callback');
    // The call back function, basically the code that recives the values sent
    function custom_data_callback() {
        // We'll use this to post back the data the server received
        print_r($_POST);
        // Lets store the data in the current session
        session_start();
        $_SESSION['custom_meta_data']  = $_POST['custom_meta_data']; 
        // RIP
        die();
    }
    //captures additional posted information (all sent in one array)
    add_filter('woocommerce_add_cart_item_data','add_item_data',1,10);
    function add_item_data($cart_item_data, $product_id) {
        // get the woocommerce object
        global $woocommerce;
        // Save values in an array to add to cart data
        $new_value = array();
        // move the values from the session into the array
        $new_value['custom_meta_data'] = $_SESSION['custom_meta_data'];
        // make sure the old values in the array don't get lost
        if(empty($cart_item_data)) {
            return $new_value;
        } else {
            return array_merge($cart_item_data, $new_value);
        }
    }
    // we make use of the values stored in the array previously and attach it to the item.
    add_filter('woocommerce_get_cart_item_from_session', 'get_cart_items_from_session', 1, 3 );
    function get_cart_items_from_session($item,$values,$key) {
        // add the custom meta data to the item
        if (array_key_exists( '_custom_options', $values ) ) {
            $item['custom_meta_data'] = $values['custom_meta_data'];
        }
        return $item;
    }

    //  displays extra information in the basket along with the product name
    add_filter('woocommerce_cart_item_name','add_user_custom_session',1,3);
    function add_user_custom_session($product_name, $values, $cart_item_key ) {
        // display the custom meta data in the basket 
        $return_string = $product_name . "<br />" . $values['_custom_options']['custom_meta_data'];
        return $return_string;
    }

    // This adds the information as meta data so that it can be seen as part of the order 
    // if you want to hide any meta data from the customer just start it with an underscore
    add_action('woocommerce_add_order_item_meta','add_values_to_order_item_meta',1,2);
    function add_values_to_order_item_meta($item_id, $values) {
        // woo and wo stuff 
        global $woocommerce,$wpdb;
        // lets add the meta data to the order!
        wc_add_order_item_meta($item_id,'custom_meta_data', $values['custom_meta_data']);
    }
    
    // Lastly lets get rid of all of the meta data when an product is removed from the basket/cart
    add_action('woocommerce_before_cart_item_quantity_zero','remove_user_custom_data_options_from_cart',1,1);
    function remove_user_custom_data_options_from_cart($cart_item_key) {
        // Bring me the woocomerce stuffs 
        global $woocommerce;
        // Get cart
        $cart = $woocommerce->cart->get_cart();
        // For each item in cart, if item is upsell of deleted product, delete it
        foreach( $cart as $key => $values) {
        if ( $values['wdm_user_custom_data_value'] == $cart_item_key )
            unset( $woocommerce->cart->cart_contents[ $key ] );
        }
    }
?>

Hi Ajay.

I'm having a tough go at trying to implement this for my situation. What I would like to do is pass the values from the select boxes (Campus Location, Class, and Orientation Code) to add_cart_item_data. Example: http://redonkhost.com/kdprep

Currently I am just trying to pass a string to see if I can get it to work but I'm getting back a "0" from the ajax success response and nothing is happening in cart.

script.js

    jQuery(document).ready(function(){
        //code to add validation on "Add to Cart" button
        jQuery('#js-add-to-cart').click(function(){
            //code to add validation, if any
            //If all values are proper, then send AJAX request

            alert('sending ajax request');

            var custom_data_1 = 'custom_data_1';


            var ajaxurl = '<?php echo admin_url('admin-ajax.php'); ?>';

            jQuery.ajax({
                url: ajaxurl, //AJAX file path - admin_url('admin-ajax.php')
                type: "POST",
                data: {
                    //action name
                    action:'custom_data_callback',
                    custom_data_1 : custom_data_1

                },
                async : false,
                success: function(data){
                    //Code, that need to be executed when data arrives after
                    // successful AJAX request execution

                    alert('ajax response recieved' + data);


                }
            });
        })
    });

sample.php

<?php

add_action('wp_ajax_custom_data', 'custom_data_callback');
add_action('wp_ajax_nopriv_custom_data', 'custom_data_callback');
// The call back function, basically the code that recives the values sent
function custom_data_callback() {
    // We'll use this to post back the data the server received
    print_r($_POST);
    // Lets store the data in the current session
    session_start();
    $_SESSION['myCustomData']  = $_POST['custom_data_1']; 
    // RIP
    die();
}


// Add data to cart
// http://stackoverflow.com/questions/25188365/how-to-retrieve-cart-item-data-with-woocommerce


/*
add_filter( 'woocommerce_add_cart_item_data', function ( $cartItemData, $productId, $variationId ) {
    $cartItemData['myCustomData'] = $_GET['link'];

    return $cartItemData;
}, 10, 3 );
*/
//captures additional posted information (all sent in one array)
    add_filter('woocommerce_add_cart_item_data','add_item_data',1,10);
    function add_item_data($cart_item_data, $product_id) {
        // get the woocommerce object
        global $woocommerce;
        // Save values in an array to add to cart data
        $new_value = array();
        // move the values from the session into the array
        $new_value['myCustomData'] = $_SESSION['myCustomData'];
        // make sure the old values in the array don't get lost
        if(empty($cart_item_data)) {
            return $new_value;
        } else {
            return array_merge($cart_item_data, $new_value);
        }
    }





add_filter( 'woocommerce_get_cart_item_from_session', function ( $cartItemData, $cartItemSessionData, $cartItemKey ) {
    if ( isset( $cartItemSessionData['myCustomData'] ) ) {
        $cartItemData['myCustomData'] = $cartItemSessionData['myCustomData'];
    }

    return $cartItemData;
}, 10, 3 );


// Show data at cart/checkout
add_filter( 'woocommerce_get_item_data', function ( $data, $cartItem ) {
    if ( isset( $cartItem['myCustomData'] ) ) {
        $data[] = array(
            'name' => 'My custom data',
            'value' => $cartItem['myCustomData']
        );
    }

    return $data;
}, 10, 2 );


// Save data
add_action( 'woocommerce_add_order_item_meta', function ( $itemId, $values, $key ) {
    if ( isset( $values['myCustomData'] ) ) {
        wc_add_order_item_meta( $itemId, 'myCustomData', $values['myCustomData'] );
    }
}, 10, 3 );

?>

Thanks for any help