如何在将用户重定向到最后一个 php 页面之前显示成功弹出消息

Question

我想要一个弹出窗口 window 让人们知道他们的评论已成功发送。一旦他们点击确定按钮，他们就会被重定向到他们所在的最后一页。如果我删除最后一行，我可以让警报工作，但它们不能一起工作。使用我下面的代码，警报消息被跳过，它直接进入推荐人行。我不知道为什么。我将衷心感谢您的帮助。谢谢

// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
} 

$sql = "INSERT INTO comment (Comment, firstname, lastname, Image_path, Approved)
VALUES ('$comment', '$firstname','$lastname','$target_file','2')";  

if ($conn->query($sql) === TRUE) {
$message = "Thankyou for your comment.";
    echo "<script type='text/javascript'>alert('$message');</script>";

} else {
    echo "Error: " . $sql . "<br>" . $conn->error;
}
}

$conn->close();
  header('Location: ' . $_SERVER['HTTP_REFERER']);

Answer 1

您不能在 header() 调用之前输出任何内容，因为它会导致 header 已发送错误。

使用 js 代码进行重定向。

试试这个：

// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
} 

$sql = "INSERT INTO comment (Comment, firstname, lastname, Image_path, Approved)
VALUES ('$comment', '$firstname','$lastname','$target_file','2')";  

if ($conn->query($sql) === TRUE) {
$message = "Thankyou for your comment.";
    echo "<script type='text/javascript'>alert('$message');</script>";
    echo "<script type='text/javascript'>
    window.location = '".$_SERVER['HTTP_REFERER']."';
    </script>";

} else {
    echo "Error: " . $sql . "<br>" . $conn->error;
}
}

$conn->close();

Answer 2

你可以试试这个，它会在警报响起 3 秒后（3000 毫秒）重定向到上一页

// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
} 

$sql = "INSERT INTO comment (Comment, firstname, lastname, Image_path, Approved)
VALUES ('$comment', '$firstname','$lastname','$target_file','2')";  

if ($conn->query($sql) === TRUE) {
$message = "Thankyou for your comment.";
    echo "<script type='text/javascript'>alert('$message');</script>";
    echo "function goBack() { setTimeout(function(){ window.history.back(); }, 3000);}";

} else {
    echo "Error: " . $sql . "<br>" . $conn->error;
}
}

$conn->close();

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