Woocommerce ID Numbers

script.js

jQuery(function($) {
    $("a.add_to_cart_button").after("<span class='item_cost_holder'></span>");
    $(".single_add_to_cart_button").after("<span id='item_cost_holder'></span>");
    $(".summary form.cart .quantity").remove();
    $(".wswp_id_numbers_field").keypress(function(event) {
        if ( $(this).closest('li').find(".add_to_cart_button").length > 0) {
             $(this).closest('li').find(".add_to_cart_button").hide();
        }
         if(event.which != 8 && event.which != 32 && isNaN(String.fromCharCode(event.which))){
           event.preventDefault(); //stop character from entering input
         }
    });

    function get_cost_and_numbers(e,type) {
        var __this = (type == 'target') ? $(e.target) : e;

        var price = (__this.parent().prev().find('.amount').length > 0) ? parseFloat(__this.parent().prev().find('.amount').text().replace(wooIDNumVars.currency_symbol,'')) : parseFloat($(".summary .price .amount").text().replace(wooIDNumVars.currency_symbol,''));
        var $return = {};
        $return['number_string'] = __this.val();
        $return['numbers'] = $return['number_string'].split(" ");
        var cost = price * $return['numbers'].length;
        $return['cost'] = (Math.round(cost * 100) / 100).toFixed(2);
        $return['cost_string'] = wooIDNumVars.currency_symbol + $return['cost'];
        return $return;
    }
    $(".wswp_id_numbers_field").change(function(event) {
        if ($(this).val().match(/[0-9][0-9]/)) {
            alert("Please enter single numbers seperated by space");
            $(this).val($(this).val().replace(/[0-9][^\s]/g,''));
        }
        var vals = get_cost_and_numbers(event,'target');

        if ($(".single_add_to_cart_button").length > 0) {
             $("#item_cost_holder").text(vals['cost_string']);
            $("input#item_cost").val(vals['cost']);
        }
        else if ($(".add_to_cart_button").length > 0) {
             $(this).closest('li').find(".add_to_cart_button").show();

             $(this).closest('li').find(".add_to_cart_button").data('item_cost',vals['cost']);
             $(this).closest('li').find(".add_to_cart_button").data('id_numbers',vals['number_string']);
             $(this).closest('li').find(".item_cost_holder").text(vals['cost_string']);
        }
    });


})

woocommerce-id-numbers.php

<?php

/*
Plugin Name: Woocommerce ID Numbers
Plugin URI: Custom functions for selling multiple numbers
Description:
Version: 1.0.0
Author: Webby Scots
Author URI: http://webbyscots.com/
*/

add_filter('wp_footer','wswp_custom_footer');

function wswp_custom_footer() {
    ?><style type="text/css">
        #id_numbers_field .description {
            font-size:0.5em;
            display:block;width:145px
        }

        #id_numbers_field {
            line-height:1;
            margin-bottom:0
        }
        #id_numbers_field input, #item_cost {
            color:red
        }
        .summary form.cart .quantity {
            display:none
        }
</style><?php
}

add_action('woocommerce_form_field_hidden','wswp_hidden_field',10,4);

function wswp_hidden_field($field,$key,$args,$value) {
    $field .= '<input type="hidden" class="input-text ' . esc_attr( implode( ' ', $args['input_class'] ) ) .'" name="' . esc_attr( $key ) . '" id="' . esc_attr( $args['id'] ) . '" '.$args['maxlength'].' value="' . esc_attr( $value ) . '" />';
    return $field;
}

//add_filter('loop_shop_columns','wswp_shop_loop_columns');

function wswp_shop_loop_columns($no) {
    return 3;
}

add_action('woocommerce_after_shop_loop_item','wswp_add_input_field',8);
add_action('woocommerce_before_add_to_cart_button','wswp_add_input_field',29);

function wswp_add_input_field() {
    echo woocommerce_form_field('id_numbers', array(
       'type' => 'text',
       'input_class' => array('wswp_id_numbers_field'),
       'placeholder' => 'Enter your numbers here',
       'description' => 'Seperate numbers with a space'
    ));
    echo woocommerce_form_field('item_cost', array(
       'type' => 'hidden',
    ));
}

add_action('wp_enqueue_scripts','wswp_add_scripts');

function wswp_add_scripts() {
    wp_enqueue_script('id_numbers',plugins_url('/js/script.js',__FILE__),array('jquery'));
    wp_localize_script('id_numbers','wooIDNumVars',array(
        'currency_symbol' => get_woocommerce_currency_symbol(),
        'ajax_url' => admin_url('admin-ajax.php')
    ));
}

add_action('woocommerce_add_to_cart','wswp_add_to_cart',50,6);

function wswp_add_to_cart($cart_item_key, $product_id, $quantity, $variation_id, $variation, $cart_item_data) {
    session_start();
    if (isset($_SESSION['id_numbers'])) {
        $_REQUEST['id_numbers'] = $_SESSION['id_numbers'];
        unset($_SESSION['id_numbers']);
        $_REQUEST['item_cost'] = $_SESSION['item_cost'];
        unset($_SESSION['item_cost']);
    }

    if (isset($_REQUEST['item_cost'])) {
        $item_cost = floatval($_REQUEST['item_cost']);
        $price = WC()->cart->cart_contents[$cart_item_key]['data']->price;
        $quantity = round($item_cost / $price);
        WC()->cart->cart_contents[$cart_item_key]['quantity'] = $quantity;
        WC()->cart->cart_contents[$cart_item_key]['chosen_numbers'] = $_REQUEST['id_numbers'];
        WC()->cart->calculate_totals();
    }
}

//add_filter('woocommerce_add_to_cart_validation','wswp_ajax_add_to_cart');

function wswp_ajax_add_to_cart($bool) {
    session_start();
    if (isset($_REQUEST['id_numbers']) || isset($_SESSION['id_numbers']))
        return $bool;


    $_REQUEST['id_numbers'] = $_SESSION['id_numbers'];
    $_REQUEST['item_cost'] = $_SESSION['item_cost'];
    return $bool;
}

add_filter('woocommerce_get_item_data','wswp_get_item_data',100,2);

function wswp_get_item_data($data,$cart_item) {
    if (isset($cart_item['chosen_numbers'])) {
        $data[]['name'] = __("Numbers","woocommerce");
        $data[]['value'] = $cart_item['chosen_numbers'];
    }
    return $data;
}

add_action('woocommerce_add_order_item_meta','wswp_order_item_meta',10,3);

function wswp_order_item_meta($item_id, $values, $cart_item_key) {
    if (isset($values['chosen_numbers'])) {
        wc_add_order_item_meta($item_id,'chosen_numbers',$values['chosen_numbers'],true);
    }
}