我如何将CSS正确应用于PHP Echo

Question

我无法收到我提交联系表的成功消息以采用其适当的CSS。

步骤如下：

1. 用户将数据输入到联系表中。

2. 该表单信息被直接用于将信息发送到电子邮件地址的外部PHP脚本。

3. 提交表单后，以Div元素的形式从PHP中出现回声，该元素读取类似"您成功！"之类的内容。(到目前为止，这正在嘲笑我(。

4. 将"成功"类分配给DIV元素，最终应应用适当类的CS

表单上的所有功能都很好，除了回声。当应用适当的类时，DIV元素没有实际更改。简而言之，我希望文本是绿色的，但它保持黑色。

html表格：

          <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 = "[e-mail]";
        // Set the email subject.
        $subject = "Subject: $subject";
        // Build the email content.
        $email_content = "Name: $namen";
        $email_content .= "Email: $emailnn";
        $email_content .= "Message:n$messagen";
        // 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"您只是不知道CSS"问题。欢迎对代码的任何批评，无论多么小或微不足道。

Answer 1

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

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