我怎样才能获得总价并将其显示在同一页面 PHP

Question

我正在使用 php 我有一个产品列表页面，该页面从数据库中获取产品并将其显示给用户。然后用户选择数量。

问题是我不知道如何在同一页面中显示总价。因为下一页是计算总价的页面。

谁能帮帮我？

我面临的主要问题是，当我更改数量时，它正在重置页面，因此数量变为 0。我需要发布才能工作，因为它是在另一个页面中计算的。

include 'Accessories.php';
include_once 'Database.php';
session_start();

$db = new Accessories();
$accessories = $db->getAllAccessories();

echo 'second time';
       
echo '<br>';
echo '<br>';
echo '<br>';
echo '<form action=" '?> <?php $_SERVER['PHP_SELF']?>  <?php  echo'"  method="post">';
echo '<div class="row"><div class="col-md-1"></div><div class="col-md-10"><input type="submit" name="submited" value="Procced" class="btn btn-block btn-primary"></div></div>';
echo '<div class="container">';



    foreach ($accessories as $ac) {

        echo 
        
        
        '<div class = "form-group">
                    
                <label for="qty_list[' . $ac->taskID . "-" . $ac->taskID . ']">'.$ac->taskName . " " . " " . $ac->description . " " . $ac->price . " BHD".'</label>';
                         echo '
 <input id="" type="number" min="0" onchange="this.form.submit()"  class="form-control" name="qty_list[' . $ac->taskID . "-" . $ac->taskID . ']" value="' ?> <?php $_POST['qty_list']   ?> <?php echo'" placeholder="">';
                    echo'</div>';
       
        echo'<br>';
    }


    '</div>
        </div>
    </div>';
  

    

echo '</form>';

<?php

session_start();
include_once 'Database.php';
include 'Ac_car_res.php';
include 'Accessories.php';
include 'Reservation.php';
$reserved = false;
//$dateFrom = $_SESSION['dateFrom'];
//$dateTo = $_SESSION['dateTo'];
//echo $dateFrom;




foreach ($_POST['qty_list'] as $key => $qty) {
 $r = 102;
    //$_SESSION['resId'] = $r;
  
    $qty;
    $acAdd = new Ac_car_res();
   // session_start();
    $resId = $r;

    $index = strrpos($key, "-");
    $sCarId = substr($key, $index + 1);
    $acId = substr($key, 0, $index);
    $acAdd->initWith($acId, $resId, $sCarId, $qty);
    $acAdd->addAcCarRes();
}

$db = Database::getInstance();
$access = new Accessories();
$res1 = new Reservation();

//echo $Id;
echo "<br>";
$r = 102;
$sql = "select * from ac_car_res where resId=" . $r;
$a = $db->multiFetch($sql);
foreach ($a as $m) {
    $access->initWithAcId($m->acId);
    $res1->initWithResId($m->resId);
    echo "accessories" . $access->getPrice() . "qty" . $m->qty;
    echo "<br>";
    $totalPriceForRes = ($res1->getTotalPrice() + $access->getPrice() * $m->qty);
    $res1->setTotalPrice($totalPriceForRes);
    echo $res1->getTotalPrice();
    echo "<br>";
    $res1->updateReservation();
}

?>

<?php

session_start();
include_once 'Database.php';
include 'Ac_car_res.php';
include 'Accessories.php';
include 'Reservation.php';
$reserved = false;
//$dateFrom = $_SESSION['dateFrom'];
//$dateTo = $_SESSION['dateTo'];
//echo $dateFrom;




foreach ($_POST['qty_list'] as $key => $qty) {
 $r = 102;
    //$_SESSION['resId'] = $r;
  
    $qty;
    $acAdd = new Ac_car_res();
   // session_start();
    $resId = $r;

    $index = strrpos($key, "-");
    $sCarId = substr($key, $index + 1);
    $acId = substr($key, 0, $index);
    $acAdd->initWith($acId, $resId, $sCarId, $qty);
    $acAdd->addAcCarRes();
}

$db = Database::getInstance();
$access = new Accessories();
$res1 = new Reservation();

//echo $Id;
echo "<br>";
$r = 102;
$sql = "select * from ac_car_res where resId=" . $r;
$a = $db->multiFetch($sql);
foreach ($a as $m) {
    $access->initWithAcId($m->acId);
    $res1->initWithResId($m->resId);
    echo "accessories" . $access->getPrice() . "qty" . $m->qty;
    echo "<br>";
    $totalPriceForRes = ($res1->getTotalPrice() + $access->getPrice() * $m->qty);
    $res1->setTotalPrice($totalPriceForRes);
    echo $res1->getTotalPrice();
    echo "<br>";
    $res1->updateReservation();
}

?>

Answer 1

正如你标记的那样，你需要使用 ajax，我将使用 jQuery，因为它很简单。

大概您的第一个 sn-p 是您的选择项目页面，但在此之前，我可能会在配置文件中创建一个自动加载器，该文件包含在每个顶级页面上：

/config.php

<?php
define('DS', DIRECTORY_SEPARATOR);
# Set the root directory
define('ROOT_DIR', __DIR__);
# I would put classes in this folder instead of root
define('VENDOR', ROOT_DIR.DS.'vendor');
# Create a class autoloader so you don't have to manually include files for classes
spl_autoload_register(function($class){
    # If you have classes in the root
    $root   = ROOT_DIR.DS.$class.'.php';
    # See if there are any in vendor folder
    $vendor = VENDOR.DS.$class.'.php';
    # Check both folders, include if available
    if(is_file($root))
        include_once($root);
    elseif(is_file($vendor))
        include_once($vendor);
});
# Start session here, then you only ever have to write it once, provided you always
# include this config on the top level page at the top
session_start();

/product_list_page.php

<?php
# Add config
require(__DIR__.DIRECTORY_SEPARATOR.'config.php');
# Create instances
$db          = new Accessories();
$accessories = $db->getAllAccessories(); ?>

second time<br><br><br>

<form action="<?php echo $_SERVER['PHP_SELF']?>" method="post">
    <div class="row">
        <div class="col-md-1">
            <div class="col-md-10">
                <input type="submit" name="submited" value="Procced" class="btn btn-block btn-primary" />
            </div><!-- close col-md-10 -->
        </div><!-- close col-md-1 -->
        <div class="container">
            <?php foreach($accessories as $ac): ?>

            <div class="form-group">
                <label for="qty_list[<?php echo $ac->taskID . "-" . $ac->taskID; ?>]"><?php echo $ac->taskName . " " . " " . $ac->description . " " . $ac->price . " BHD" ?></label>
                <input id="" type="number" min="0" class="form-control" name="qty_list[<?php echo $ac->taskID . "-" . $ac->taskID ?>]" value="<?php echo $_POST['qty_list'] ?>" placeholder="" />
            </div><!-- close form-group -->
            <br>

            <?php endforeach ?>
        </div><!-- close container -->
    </div><!-- close row -->
</form>
<!-- value will returned to this div -->
<div id="total-value"></div>

<script>
    // Make sure to add the jquery library link
    $(function(){
        // Use a listener instead of inline javascript
        $('form').on('change',function(e){
            $.ajax({
                // This page will process the form and calculate total
                'url': '/calculate.php',
                // Send via post
                'type': 'post',
                // Serialize the data
                'data': $(this).serialize(),
                // If/when the response from calculate is successful
                'success': function(response) {
                    // Put that total into the blank div in the above html
                    $('#total-value').html(response);
                }
            });
        });
    });
</script>

/calculate.php

<?php
# Include config
include(__DIR__.DIRECTORY_SEPARATOR.'config.php');
/**
* Do your total calculations here based on POST then echo the final number. Whatever is 
* echoed on this page will show up in the other page inside the "total-value" div
*/