如何从PHP中显示JavaScript警告框？

Question

我不会编写PHP代码，但是我从网上找到了这个表单，它运行得很好：

我想在这里添加一些代码，以便在这个 mailer.php 文件接收到表单后启动一个JS脚本，弹出一个简单的提示框，显示“感谢您提交表单”。

<?php
if(isset($_POST['submit'])) {

$to = "[e-mail]";
$subject = "Form Tutorial";
$name_field = $_POST['name'];
$email_field = $_POST['email'];
$message = $_POST['message'];

$body = "From: $name_field\n E-Mail: $email_field\n Message:\n $message";

echo "Data has been submitted to $to!";
mail($to, $subject, $body);

} else {

echo "blarg!";

}
?>

- JL.

---

哈哈，这个描述性错误消息真是太有趣了...毕竟这是PHP。 - Kaleb Brasee

注意：仅仅因为你可以使用警告框并不意味着你应该使用它。 - Jason S

Answer 1

用以下替代：

echo "Data has been submitted to $to!";

只是

echo '<script type="text/javascript">alert("Data has been submitted to ' . $to . '");</script>';

- timdev

Answer 2

您可以在PHP中的<script></script>块中使用echo JavaScript。然后，浏览器将执行它。

例如：

<?php
     echo "<script language='javascript'>alert('thanks!');</script>"; 
?>

- Marc W

Answer 3

您只需要输出HTML/JS。就像这样：

<?php
    if(isset($_POST['submit'])) {
        $to = "[e-mail]";
        $subject = "Form Tutorial";
        $name_field = $_POST['name'];
        $email_field = $_POST['email'];
        $message = $_POST['message'];

        $body = "From: $name_field\n E-Mail: $email_field\n Message:\n $message";

        mail($to, $subject, $body);
        echo "<script type=\"text/javascript\">alert('Thank you form is submitted');</script>";
    } else {
        echo "blarg!";
    }
?>

或者：

<?php
    if(isset($_POST['submit'])) {
        $to = "[e-mail]";
        $subject = "Form Tutorial";
        $name_field = $_POST['name'];
        $email_field = $_POST['email'];
        $message = $_POST['message'];

        $body = "From: $name_field\n E-Mail: $email_field\n Message:\n $message";

        mail($to, $subject, $body);
?>
    <script type="text/javascript">alert('Thank you form is submitted.');</script>
<?php
    } else {
        echo "blarg!";
    }
?>

然而，您似乎不希望在提交表单和向用户确认之间重新加载页面。为此，您需要通过AJAX提交表单。我建议研究JQuery。它可以轻松实现这一点。点击这里了解更多。

- Jeremy Logan