如何在按下提交时将表单控件中的值传递给php html中的变量

Question

我想要做的是根据用户按下的按钮将值传递给变量。 我创建了一个带有while循环的表和删除按钮，但是，因此，所有按钮都具有相同的名称和ID。 当按下相应的按钮时，如何将特定的UserID传递给变量？

这是我的PHP嵌入式HTML

<?php
    $servername = "localhost";
    $username = "root";
    $password = "A1128857795!";

    // Create connection
    $conn = new mysqli($servername, $username, $password);

    // Check connection
    if ($conn->connect_error) {
        die("Connection failed: " . $conn->connect_error);
    } else{
        echo "Connected successfully";}


    mysqli_select_db($conn,'test_schema');

    $sql = "SELECT * FROM userinfo;";

    $retvalues = mysqli_query($conn, $sql);

    if(!$retvalues)
        {
            die("could not get data: " . mysqli_error());
        }


    print("<br>");
    echo "<form action='delete.php' method='POST'>";
    echo"<table border='1'>";
    echo"<tr align='center'>";
    echo "<th>ID</th>";
    echo "<th>NAME</th>";
    echo "<th>GENDER</th>";
    echo "</tr>";
    while($row = mysqli_fetch_array($retvalues, MYSQL_ASSOC))
    {   
            print("<tr>");
            echo "<td><input type='text' name='id' value='{$row['UserID']}'/></td>". " " . "<td>{$row['FirstName']}" . " " . "{$row['LastName']}</td>" .
                " " . "<td align='center'>{$row['gender']}</td>"; 
            echo "<td><input  name='Delete' value='Delete' type='submit'></td>";
            print("</tr>");
    }

    echo "</table>";
    echo "</form>";

当我按下任何按钮时，它每次都返回表格最后一行的ID，导致DELETE语句始终从我的数据库中删除最后一条记录。

if(isset($_POST['id']))
    {   

        $delUID = $_POST['id'];
        $sql="DELETE FROM userinfo WHERE UserID = $delUID";
        $query = mysqli_query($conn, $sql);
        echo "DELETE FROM userinfo WHERE UserID = $delUID;";
    }
    $conn->close();
?>

任何建议都会受到欢迎。 谢谢。

Answer 1

您可以在旧学校输入按钮的名称中使用数组，也可以使用<button>标签来设置不同的值和标题。

<form method="post">
  <?php for($id = 1; $id <= 3 ; $id++): ?>
    <input type="submit" name="delete_a[<?php echo $id; ?>]" value="Caption of delete button a">
    <button type="submit" name="delete_b" value="<?php echo $id; ?>">Caption of delete button b</button>
    <br>
  <?php endfor; ?>
</form>
<?php
var_dump($_POST);
?>

使用阵列版本，您甚至可以使用复选框和任何提交按钮一次删除多行。 然后，您对数组$_POST['delete_a']的键感兴趣。

Answer 2

我会考虑做这样的事情

<?php
$servername = "localhost";
$username = "root";
$password = "A1128857795!";

// Create connection
$conn = new mysqli($servername, $username, $password);

// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
} else{
    echo "Connected successfully";}


mysqli_select_db($conn,'test_schema');

$sql = "SELECT * FROM userinfo;";

$retvalues = mysqli_query($conn, $sql);

if(!$retvalues)
    {
        die("could not get data: " . mysqli_error());
    }


print("<br>");
echo "<form action='delete.php' method='POST'>";
echo"<table border='1'>";
echo"<tr align='center'>";
echo "<th>ID</th>";
echo "<th>NAME</th>";
echo "<th>GENDER</th>";
echo "</tr>";
while($row = mysqli_fetch_array($retvalues, MYSQL_ASSOC))
{   
        print("<tr>");// I don't think u need to give user a chance to edit their UserID.. so I kept it in hidden type
        echo "<td>{$row['UserID']}<input type='hidden' name='userid' value='{$row['UserID']}'/></td>". " " . "<td>{$row['FirstName']}" . " " . "{$row['LastName']}</td>" .
            " " . "<td align='center'>{$row['gender']}</td>"; 
        echo "<td><input  name='Delete' value='Delete' type='submit'></td>";
        print("</tr>");
}

echo "</table>";
echo "</form>";

接收方

if(isset($_POST['Delete']))
{   

    $delUID = $_POST['userid'];
    $sql="DELETE FROM userinfo WHERE UserID = $delUID";
    $query = mysqli_query($conn, $sql);
    echo "DELETE FROM userinfo WHERE UserID = $delUID;";
}
$conn->close();

Answer 3

@f_anto有正确的想法。

使用查询循环创建表，但为每行附加唯一的链接或按钮。

while($row = mysqli_fetch_array($retvalues, MYSQL_ASSOC)) {   
        echo "<td><input type='text' name='id' value='{$row['UserID']}'/></td>"
        . "<td>{$row['FirstName']} " . "{$row['LastName']}</td>" .
        . "<td align='center'>{$row['gender']}</td>"
        . "<td><a href='' id='$row['UserID']' class='delete-button'></td>";
}

然后使用AJAX调用来完成脏工作。

$(".delete-button").on('click', function(e){
    e.preventDefault();
    var $id = $(this).attr("id");
    $.ajax({
      type: "POST",
      url: "delete.php",
      data: ["id": $id]
  });
});

或类似的东西。 轻松的例子： https ： //jsfiddle.net/mcmullen_greg/okvrbfnx/1/