Question

我想通过从下拉列表中存储的Products中检索所有折扣代码来更新Discounts中的折扣代码，并让用户在{中选择新代码或重置有效折扣代码{1}}。

Html表格显示所有带有Products（product_discount）加入折扣代码（Discounts）的产品。将discount_code重置为“无折扣”工作正常，但我的下拉product_discount总是空的，我很难过。谢谢。

$_Post['discount']

对不起家伙我弄错了＃@ ^^ Html select未正确包装在每个产品的表单中。这是工作代码：

<?php 
session_start();
if (isset($_POST['change'])) {  // is OK
    $change = $_POST['change'];
    if (!empty($_POST['discount'])) {  // PROBLEM : always empty and never updated
        $new_discount = $_POST['discount'];
        // All DB stuff config/try goes here
        $updt = $connexion -> prepare(
            "UPDATE Products SET product_discount = '$new_discount'  
            WHERE productID = '$change'" 
            );
        $updt->execute();
        $connexion = null; 
        // All DB stuff catch goes here
    }
}
if (isset($_POST['reset'])) {  // is OK
 $reset = $_POST['reset'];
 $no_discount = 'no discount';
    // All DB stuff config/try goes here
 $updt = $connexion -> prepare(  
  "UPDATE Products SET product_discount = '$no_discount'  
  WHERE productID = '$reset'" 
  );
    $updt->execute(); //  Update OK
    $connexion = null; 
    // All DB stuff catch goes here
}
?>
    ...

    <body>
        <?php
    // All DB stuff config/try goes here
    // Join tables  
    $select = $connexion -> prepare(
        "SELECT
        Products.productID,
        Products.product_name,
        Products.product_price,
        Products.product_discount,
        Discounts.discount_code,
        Discounts.discount_desc,
        Discounts.discount_percent,
        FROM Products
        INNER JOIN Discounts ON Products.product_discount = Discounts.discount_code"
        );                  
    $select->execute();
    $resultat = $select->fetchall();

    // Html table displays only products on discount
    $display_discounts .= '<p style="font-size: 20px; text-align: center;">Active discounts</p>
        <form method="post" action="">
        <table cellpadding="0" cellspacing="0"  align="center" class="db-table">
        <tr>
        <th>Product</th>
        <th>Public price</th>
        <th>Discount price</th>
        <th>Discount code</th>
        <th>Description</th>
        <th>New code</th>
        <th> </th>
        <th> </th>
        </tr>';                 

        foreach($resultat as $row)     // loop on Products
        {           
        $discount_price = $row['product_price'] - ($row['product_price'] * $row['discount_percent'] );
        $display_discounts .= '<tr>
            <td>'.$row['product_name'].'</td>
            <td>'.$row['product_price'].'</td>
            <td>'.$discount_price.'</td>
            <td>'.$row['product_discount'].'</td>
            <td>'.$row['discount_desc'].'</td>';                    

            // populate discount codes in drop-down 
            $select_d = $connexion -> prepare(
                "SELECT
                 discount_code
                 FROM Discounts"
                 );
            $select_d->execute();
            $result_d = $select_d->fetchall();

            $display_discounts .= "<td><select id='discount' name='discount'>";

            foreach($result_d as $row_d) {    // loop on Discounts
                $display_discounts .= "<option value='".$row_d['discount_code']."'>".$row_d['discount_code']."</option>";
                // value is well populated but empty in $_POST['discount'] 

                $display_discounts .= '</select></td>
                    <td><button class="btn btn-danger bold" type="submit" name="change"  value="'.$row['productID'].'">Change</button></td>
                    <td><button class="btn btn-danger bold" type="submit" name="reset" value="'.$row['productID'].'">Reset</button></td>
                    </tr>';
            }
    $display_discounts .= '</table></form>';                    
    echo $display_discounts;                                        
    $connexion = null; 

...
</body>

带有工作代码和干净HTML（CSS＆amp; PHP）的新版本

CSS

     ...
        $result_d = $select_d->fetchall();

// ----------->> start form        
      $display_discounts .= "<form action='' method='post'><td><select id='discount' name='discount'>";

                    foreach($result_d as $row_d) {    // loop on Discounts
                        $display_discounts .= "<option value='".$row_d['discount_code']."'>".$row_d['discount_code']."</option>";
                    }

                        $display_discounts .= '</select></td>
                            <td><button class="btn btn-danger bold" type="submit" name="change"  value="'.$row['productID'].'">Change</button></td>
                            <td><button class="btn btn-danger bold" type="submit" name="reset" value="'.$row['productID'].'">Reset</button></td></tr>
// ----------->> end form
         </form>';

                    } // end loop Products
            $display_discounts .= '</table>';                   
            echo $display_discounts;

PHP

div.table {
    display: table;
    border-right: 1px solid #ccc;
    border-bottom: 1px solid #ccc;
}

div.thead {
    display: table-header-group;
    font-weight: bold;
    background: #eee;
    padding: 5px;
    text-align: center;
    border-left: 1px solid #ccc;
    border-top: 1px solid #ccc;
}

form.tr,
div.tr {
    display: table-row;
}

span.td,
span.th {
    display: table-cell;
    padding: 5px;
    text-align: center;
    border-left: 1px solid #ccc;
    border-top: 1px solid #ccc;
}

从下拉列表中清空$ _POST

0 个答案: