如何在woocommerce结帐页面的后端显示计算值

如何解决如何在woocommerce结帐页面的后端显示计算值

我正在为我的公司创建一个在线商店，该公司是一家银行的子公司。在银行贷款的帮助下，我们希望建立分期销售商品的基础设施。通过使用这个 plugin，我设法添加了一个选择字段，让买方选择他的贷款计划。 还有其他字段，但这里不重要。我还向该字段添加了 update_totals_on_change 类，因此当它更改整个结帐页面时，会通过 ajax 刷新。每次贷款计划以这种方式改变时，我都设法计算了 woocommerce_cart_calculate_fees 的分期付款金额：

add_action( 'woocommerce_cart_calculate_fees','manipulate_order',99 );

function manipulate_order( $cart ) {

    if ( ! $_POST || ( is_admin() && ! is_ajax() ) ) {
         return;
    }
    $post_data=null;
    if ( isset( $_POST['post_data'] ) ) {
        parse_str( $_POST['post_data'],$post_data );
    } else {
        $post_data = $_POST; 
    }

    session_start();
    $_SESSION['payment'] = $post_data['payment'];

    if($post_data['payment'] == 'cash')
    {
        WC()->cart->fees_api()->set_fees(array());
    }
    else
    {
        $items = WC()->cart->get_cart_contents();
        $cartInfo = array();
        foreach ($items as $item => $values) {
            $productInfo = array();
            array_push($productInfo,$values['data']->get_id());
            array_push($productInfo,$values['quantity']);
            array_push($productInfo,get_post_meta($values['product_id'],'_price',true));
            array_push($productInfo,'interest',true));
            array_push($cartInfo,$productInfo);
        }
        $targetBenefit = 7;
        $total_price = 0;
        $average_weighted_interest = 0;
        for ($i = 0; $i < count($cartInfo); $i++) {
             $total_price += ($cartInfo[$i][1] * $cartInfo[$i][2]);
            $average_weighted_interest += $cartInfo[$i][1] * $cartInfo[$i][2] * $cartInfo[$i][3] / 100;
        }
         
        $average_weighted_interest = round(100 * $average_weighted_interest / $total_price,2);
        $prepayment_percent = $post_data['prepayment'];
        $bank_wage_percent = explode("_",$post_data['loan'])[0];
        $bank_wage_period = explode("_",$post_data['loan'])[1];
        $adjusted_bank_wage_percent = round($bank_wage_percent*(1-$prepayment_percent/100),2);
        $increase_percent = round($targetBenefit + $adjusted_bank_wage_percent - $average_weighted_interest,2);
        $added_expense = round($total_price * $increase_percent/100,2);
        $loan_amount = round((($total_price + $added_expense)-$total_price*$prepayment_percent/100),2);
        $_SESSION['loan_amount'] = $loan_amount;
        $installment =  calPMT(18,$bank_wage_period,$loan_amount);
        $_SESSION['installment'] = $installment;
        
        WC()->cart->add_fee('Added Expense: ',$added_expense);
        WC()->cart->add_fee('Loan Amount: ',0-$loan_amount);
        if($loan_amount > 150000){
            wc_add_notice( __( 'Your Loan amount is bigger than maximum,delete some product or increase prepayment' ),'error' );
        }
    }
}

function calPMT($apr,$term,$loan)
{
    $term = $term;
    $apr = $apr / 1200;
    $amount = $apr * -$loan * pow((1 + $apr),$term) / (1 - pow((1 + $apr),$term));
    return round($amount);
}

我还在结帐中添加了另外两个文本只读字段，一个用于具有相同 ID 的 loan_amount，另一个用于 installment 也具有相同的 ID。我想将这两个计算值从提到的操作返回到前端，并在每次整个结帐页面更新时将它们显示为两个只读字段的值。有一堆有用的事件 here .probably update_checkout 事件最适合我的问题，但我不知道如何将这两个值从 manipulate_order 回调返回到前端并在那里显示在读取- 仅限字段。