在我提交联系表单以采用其适当的 CSS 后，我无法获得出现的成功消息。

步骤如下:

1. 用户将他们的数据输入联系表。

2. 该表单信息被定向到一个外部 PHP 脚本，该脚本将信息发送到一个电子邮件地址。

3. 提交表单后，PHP 会以 DIV 元素的形式出现回显，内容类似于“您已成功!” (到现在为止，这是在 mock 我)。

4. “成功”类被分配给 DIV 元素，它最终应该应用适当类的 CSS

表单上的所有功能都很好，除了回显。虽然应用了适当的类，但 DIV 元素没有实际更改。简单来说，我希望文本为绿色，但它保持黑色。

HTML 格式:

          <div class="col-lg-5 col-md-8">
            <div id="sendmessage" ></div>
            <div id="errormessage"></div>
            <div class="form">
              <form action="php/contactform.php" method="post" role="form" class="contactForm" id="contactForm">
                <div class="form-group">
                  <input type="text" name="name" class="form-control" id="name" placeholder="Your Name" data-rule="minlen:4" required />
                </div>
                <div class="form-group">
                  <input type="email" class="form-control" name="email" id="email" placeholder="Your Email" data-rule="email" required />
                </div>
                <div class="form-group">
                  <input type="text" class="form-control" name="subject" id="subject" placeholder="Subject" data-rule="minlen:4" required />
                </div>
                <div class="form-group">
                  <textarea class="form-control" name="message" id="message" rows="5" data-rule="required" required placeholder="Message"></textarea>
                </div>
                <div class="text-center"><button type="submit" name="submit">Send Message</button></div>
              </form>
            </div>
          </div>

CSS:

#contact .form .success {
  padding: 1em;
  margin-bottom: 0.75rem;
  text-shadow: 0 1px 0 rgba(255, 255, 255, 0.5);
  color: #468847;
  background-color: #dff0d8;
  border: 1px solid #d6e9c6;
  -webkit-border-radius: 4px;
     -moz-border-radius: 4px;
          border-radius: 4px;
}

#contact .form .error {
  padding: 1em;
  margin-bottom: 0.75rem;
  text-shadow: 0 1px 0 rgba(255, 255, 255, 0.5);
  color: #b94a48;
  background-color: #f2dede;
  border: 1px solid rgba(185, 74, 72, 0.3);
  -webkit-border-radius: 4px;
     -moz-border-radius: 4px;
          border-radius: 4px;
}

PHP:

<?php
    if ($_SERVER["REQUEST_METHOD"] == "POST") {
        // Get the form fields and remove whitespace.
        $name = strip_tags(trim($_POST["name"]));
                $name = str_replace(array("\r","\n"),array(" "," "),$name);
        $subject = strip_tags(trim($_POST["subject"]));
                $subject = str_replace(array("\r","\n"),array(" "," "),$subject);
        $email = filter_var(trim($_POST["email"]), FILTER_SANITIZE_EMAIL);
        $message = trim($_POST["message"]);

        // Check that data was sent to the mailer.
        if ( empty($name) OR empty($subject) OR empty($message) OR !filter_var($email, FILTER_VALIDATE_EMAIL)) {
            // Set a 400 (bad request) response code and exit.
            http_response_code(400);
            echo "Oops! There was a problem with your submission. Please complete the form and try again.";
            exit;
        }

        // Set the recipient email address.
        // FIXME: Update this to your desired email address.
        $recipient = "me@cbonilla.dev";

        // Set the email subject.
        $subject = "Subject: $subject";

        // Build the email content.
        $email_content = "Name: $name\n";
        $email_content .= "Email: $email\n\n";
        $email_content .= "Message:\n$message\n";

        // Build the email headers.
        $email_headers = "From: $name <$email>";

        // Send the email.
        if (mail($recipient, $subject, $email_content, $email_headers)) {
            // Set a 200 (okay) response code.
            http_response_code(200);
            echo "Thank You! Your message has been flarged.";
        } else {
            // Set a 500 (internal server error) response code.
            http_response_code(500);
            echo "Oops! Something went wrong and we couldn't send your message.";
        }

    } else {
        // Not a POST request, set a 403 (forbidden) response code.
        http_response_code(403);
        echo "There was a problem with your submission, please try again.";
    }

?>

我不会链接到 Ajax，因为它已经应用了适当的类。

我会继续寻找迭代，但我认为这归结为“您只是不了解 CSS”的问题。欢迎对代码提出任何批评，无论多小或微不足道。

最佳答案

您正在尝试将 success 类附加到 sendmessage。为此，您的 CSS 内容应如下所示，

#contact #sendmessage.success {color:green;}

关于php - 如何正确地将 CSS 应用于 PHP 回显？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/55998363/