Question

order.php

  require_once(conn.php);

session_start();
$itemId=$_SESSION['itemId'];
$tnumber=$_SESSION['tnumber'];
$custno=$_SESSION['custno'];

 $sql="select itemId,subtitle,price,quantity from cart where tnumber='$tnumber'" ;
 $res=mysqli_query($dbhandle,$sql);
 $total=0;
?>
<html>
<head>
    <title>Home</title>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width">
 <link rel="stylesheet" type='text/css' href='cartbox.css'/>
</head>
<body>
    <h1></h1>
    <script src="home.js"></script>

        <div id="shopping-cart"> </div>


    <?php

                echo "<table id='t1' border='1'>
                <th>Subtitle</th>
                <th>Quantity</th>
                <th>Price</th>
                <th>Amount</th>
                </tr>";   
          while ($row=mysqli_fetch_array($res)) 
          {
          $amount=$row['price']*$row['quantity'];
          echo "<tr>";
          echo "<td>" .$row['subtitle'] ."</td>";
          echo "<td>" .$row['quantity'] ."</td>";
          echo "<td>" .$row['price'] ."</td>";
          echo "<td>" . $amount . "</td>";
          echo' <form id="addform" method="post" action="cartdelete.php"> ';
         echo "<td><input type='submit' value='x' name='submit'></td>";

         echo "<td><input type='text' name='itemId'  value= ".$row['itemId']."></td>";     

         $total = $total+ $amount;

         }
         echo"</form>";
         echo "</table>";
         ?>
       <?php echo $total ?> 
      <input type="button" name="continue" value="Continue Order" style="position: absolute;top:200px;" onclick="location.href='customerdicecream.php'">

       </body>
       </html>

cartdelete.php

      <?php
      require_once(conn.php);
      $itemId=(filter_input(\INPUT_POST,'itemId'));
      $sql1="select itemId from cart";
      $res1=mysqli_query($dbhandle,$sql1);
      $row=mysqli_fetch_array($res1);
      $itemId1=$row['itemId'];

      if(!empty(\filter_input(INPUT_POST,'submit')))
         {
           $sql="delete from cart where itemId='$itemId1'";
           $res=mysqli_query($dbhandle,$sql) or die(\mysqli_error($dbhandle));
         }
          echo"deleted successfully";
          $mysqli_close = \mysqli_close($dbhandle);

我从购物车表中检索了价值并显示在html表格中，每行都有一个删除按钮。但每当我尝试删除而不管按钮时，只有表格的第一行被删除。我猜deletecart.php中的sql查询是错误的。请更正代码和查询..

Answer 1

取决于，如果您尝试删除一行，那么这很好：

$sql="delete from cart where itemId='$itemId1'";

然而，要简单地删除所有内容：

$ sql =＆＃34; DELETE *来自购物车＆＃34;;

Answer 2

问题不在购物车删除中，而是在order.php中。我在这里看到两件事。

首先，你在while循环中打开每个表单，但是你不要关闭表单直到循环外（并且你从未关闭＆lt; tr＆gt; s）。这导致：

<form id="addform" method="post" action="cartdelete.php">
....
<form id="addform" method="post" action="cartdelete.php">
....
<form id="addform" method="post" action="cartdelete.php">
....
</form>

仅关闭外部表单。这对应于表格的第一行。无论您在表格中单击哪个提交按钮，它们都会映射回第一个。

其次，我建议你给每个表单一个唯一的id。

echo "<form id=\"addform" . echo $row['itemId'] . "\" method="post" action="cartdelete.php"> ';

我在页面上有多个表单的实例，其ID相同，在不同的浏览器中显示不同的结果。

$total = 0;
while ($row=mysqli_fetch_array($res)) 
{
    $amount=$row['price']*$row['quantity'];
    echo "<tr>";
    echo "<td>" .$row['subtitle'] ."</td>";
    echo "<td>" .$row['quantity'] ."</td>";
    echo "<td>" .$row['price'] ."</td>";
    echo "<td>" . $amount . "</td>";
    echo "<form id='addform{$row['itemId']}' method='post' action='cartdelete.php'> ";
    echo "<td><input type='submit' value='x' name='submit'></td>";

    echo "<td><input type='text' name='itemId'  value= '{$row['itemId']}'></td>";     
    echo"</form>";
    echo "</tr>";
    $total += $amount;
}
echo "</table>";

cartdelete.php中也存在问题。这一行：

$sql1="select itemId from cart";

只能找到购物车中的第一件商品。无论如何，它永远不会找到第二或第三项。甚至可能不需要它。由于我不知道表结构，请尝试：

  $itemId=(filter_input(\INPUT_POST,'itemId'));
  if(!empty(\filter_input(INPUT_POST,'submit')))
     {
       $sql="delete from cart where itemId='$itemId'";
       $res=mysqli_query($dbhandle,$sql) or die(\mysqli_error($dbhandle));
     }
      echo"deleted successfully";
      $mysqli_close = \mysqli_close($dbhandle);

总是使用PHP代码删除html表的第一行

2 个答案: