我对php很陌生，我需要帮助。 我开发了一个 php 联系页面，但是当字段空白时，我在验证时遇到问题。当我测试我的验证时，它会打开 php 页面并显示消息而不是显示警报。请看下图
验证问题
这是我的代码：
.HTML：
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Exam Portal </title>
<!--META-->
<meta name="viewport" content="width=device-width initial-scale=1.0">
<!--FONT-->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.6.0/css/font-awesome.min.css">
<link href='https://fonts.googleapis.com/css?family=Roboto:400,300,700,500' rel='stylesheet' type='text/css'>
<link href='https://fonts.googleapis.com/css?family=Montserrat' rel='stylesheet' type='text/css'>
<link href='https://fonts.googleapis.com/css?family=Merriweather:400,300' rel='stylesheet' type='text/css'>
<!--CSS-->
<link rel="stylesheet" type="text/css" href="css/grid.css">
<link rel="stylesheet" type="text/css" href="css/style.css">
<link rel="stylesheet" type="text/css" href="css/responsive.css">
<link rel="stylesheet" type="text/css" href="css/animate.css">
</head>
<body>
<div class="se-pre-con">
<div class="cssload-container">
<div class="cssload-loading"><i></i><i></i><i></i><i></i></div>
</div>
</div>
<header style="background-color:black" id="top">
<div class="container">
<div class="header-bottom">
<div class="row">
<div class="col-lg-4 col-md-4 col-sm-5 col-xs-12">
<div class="logo">
<a href="#banner" data-scroll><img src="img/logo.png" alt="" /></a>
</div>
</div>
<div class="col-lg-8 col-md-8 col-sm-7 col-xs-12">
<nav class="nav-collapse">
<ul>
<li class="menu-item"><a href="index.html" data-scroll>HOME</a></li>
<li class="menu-item"><a href="aboutus.html" data-scroll>ABOUT US</a></li>
<li class="menu-item"><a href="howdoesitwork.html" data-scroll>HOW DOES IT WORK</a></li>
<li class="menu-item"><a href="whousesexamportal.html" data-scroll>WHO USES EP</a></li>
<li class="menu-item"><a href="gallery.html" data-scroll>GALLERY</a></li>
<li class="menu-item"><a href="news.html" data-scroll>NEWS</a></li>
<li class="menu-item active"><a href="contactus.html" class="btnstart" data-scroll>CONTACT US </a></li>
</ul>
</nav>
</div>
</div>
</div>
</div>
</header> <br><br><br><br><br><br>
<section id="contact2">
<div id="contact-us-map">
<iframe width="100%" height="100%" frameborder="0" scrolling="no" marginheight="0" marginwidth="0" src="https://www.google.com/maps/embed?pb=!1m23!1m12!1m3!1d114610.04099879299!2d28.110395278010596!3d-26.145762465850492!2m3!1f0!2f0!3f0!3m2!1i1024!2i768!4f13.1!4m8!3e6!4m0!4m5!1s0x1e9513bfa79eae3f%3A0xabf626720595f367!2shighway+gardens+office+park!3m2!1d-26.1457794!2d28.1804356!5e0!3m2!1sen!2sza!4v1497301543030"></iframe>
<br />
<small>
<a href="https://www.google.co.za/maps/place/Highway+Gardens+Office+Park/@-26.1457794,28.1782469,17z/data=!3m1!4b1!4m5!3m4!1s0x1e9513bfa79eae3f:0xabf626720595f367!8m2!3d-26.14635!4d28.1796255?hl=en"></a>
</small>
</iframe>
</div>
<div class="container">
<div class="row">
<div class="col-lg-12 col-md-12 col-sm-12">
<div class="contact_area">
<div class="client_title">
<hr>
<h2>We Would Love To Hear From You</h2>
</div>
<div class="row">
<div class="col-lg-6 col-md-6 col-sm-6">
<div class="contact_left wow fadeInLeft">
<form method="post" class="submitphoto_form" action="contact.php" id="contactpage">
<input type="text" class="form-control wpcf7-text" placeholder="Your name" name="name" id="name">
<input type="mail" class="form-control wpcf7-email" placeholder="Email address" name="email" id="email">
<input type="text" class="form-control wpcf7-text" placeholder="Subject" name="subject" id="subject">
<textarea style="height:300px" class="form-control wpcf7-text" placeholder="What would you like to tell us" name="message" id="message"></textarea>
<input type="submit" value="Submit" class="wpcf7-submit photo-submit" name="send" id="send">
</form>
</div>
</div>
<div class="col-lg-6 col-md-6 col-sm-6">
<div class="contact_right wow fadeInRight">
<img src="img/phone_icon.png" alt="img">
<p>Say hello! </p>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</section>
<footer>
<div class="container">
<div class="row">
<div class="col-lg-6 col-md-6 col-sm-6 col-xs-12">
<div class="footersocial">
<i class="fa fa-twitter" aria-hidden="true"></i>
<i class="fa fa-facebook" aria-hidden="true" ></i>
<i class="fa fa-instagram" aria-hidden="true"></i>
<i class="fa fa-dribbble" aria-hidden="true"></i>
<i class="fa fa-gg-circle" aria-hidden="true"></i>
</div>
</div>
</div>
</div>
</footer>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.2/jquery.min.js"></script>
<script type="text/javascript" src="js/fixed-responsive-nav.js"></script>
<script type="text/javascript" src="js/script.js"></script>
<script type="text/javascript" src="js/waypoints.min.js"></script>
<script type="text/javascript">
jQuery(document).ready(function(){
//$('#contactpage').validate();
$('#contactpage').submit(function(){
var action = $(this).attr('action');
$.ajax({
type: "POST",
url: action,
data: {
name: $('#name').val(),
email: $('#email').val(),
subject: $('#subject').val(),
message: $('#message').val()
},
dataType: "json",
cache: false,
success: function (data) {
if(data.type == 'success') {
alert(data.text);
}
else {
alert(data.text);
}
}
});
/*$.post(action, {
name: $('#name').val(),
email: $('#email').val(),
subject: $('#subject').val(),
message: $('#message').val()
},
function(data){
if(data.type == 'success') {
alert("Message sent successfully.");
}
else {
alert("An error occured.");
}
}
);*/
return false;
});
});
</script>
</body>
</html>
.PHP：
<?php
function isEmail($email) {
return(preg_match("/^[-_.[:alnum:]]+@((([[:alnum:]]|[[:alnum:]][[:alnum:]-]*[[:alnum:]]).)+(ad|ae|aero|af|ag|ai|al|am|an|ao|aq|ar|arpa|as|at|au|aw|az|ba|bb|bd|be|bf|bg|bh|bi|biz|bj|bm|bn|bo|br|bs|bt|bv|bw|by|bz|ca|cc|cd|cf|cg|ch|ci|ck|cl|cm|cn|co|com|coop|cr|cs|cu|cv|cx|cy|cz|de|dj|dk|dm|do|dz|ec|edu|ee|eg|eh|er|es|et|eu|fi|fj|fk|fm|fo|fr|ga|gb|gd|ge|gf|gh|gi|gl|gm|gn|gov|gp|gq|gr|gs|gt|gu|gw|gy|hk|hm|hn|hr|ht|hu|id|ie|il|in|info|int|io|iq|ir|is|it|jm|jo|jp|ke|kg|kh|ki|km|kn|kp|kr|kw|ky|kz|la|lb|lc|li|lk|lr|ls|lt|lu|lv|ly|ma|mc|md|me|mg|mh|mil|mk|ml|mm|mn|mo|mp|mq|mr|ms|mt|mu|museum|mv|mw|mx|my|mz|na|name|nc|ne|net|nf|ng|ni|nl|no|np|nr|nt|nu|nz|om|org|pa|pe|pf|pg|ph|pk|pl|pm|pn|pr|pro|ps|pt|pw|py|qa|re|ro|ru|rw|sa|sb|sc|sd|se|sg|sh|si|sj|sk|sl|sm|sn|so|sr|st|su|sv|sy|sz|tc|td|tf|tg|th|tj|tk|tm|tn|to|tp|tr|tt|tv|tw|tz|ua|ug|uk|um|us|uy|uz|va|vc|ve|vg|vi|vn|vu|wf|ws|ye|yt|yu|za|zm|zw)$|(([0-9][0-9]?|[0-1][0-9][0-9]|[2][0-4][0-9]|[2][5][0-5]).){3}([0-9][0-9]?|[0-1][0-9][0-9]|[2][0-4][0-9]|[2][5][0-5]))$/i",$email));
}
if (!defined("PHP_EOL")) define("PHP_EOL", "rn");
$name = $_POST['name'];
$email = $_POST['email'];
$subject = $_POST['subject'];
$message = $_POST['message'];
if(empty($name)) {
$output = json_encode(array( //create JSON data
'type'=>'error',
'text' => 'Please Enter Your Name.'
));
die($output);
} else if(trim($email) == '') {
$output = json_encode(array( //create JSON data
'type'=>'error',
'text' => 'You Have Enter An Invalid E-mail Address, Try Again.'
));
die($output);
}
else if(!isEmail($email)) {
$output = json_encode(array( //create JSON data
'type'=>'error',
'text' => 'You Have Enter An Invalid E-mail Address, Try Again.'
));
die($output);
}
else if(empty($subject)) {
$output = json_encode(array( //create JSON data
'type'=>'error',
'text' => 'Please Enter Your Mail Subject.'
));
die($output);
}
else if(empty($message)) {
$output = json_encode(array( //create JSON data
'type'=>'error',
'text' => 'Please Enter Your Message.'
));
die($output);
}
else {
$fromMail = $email;
$toMail = "myemail@gmail.com";
$boundary = str_replace(" ", "", date('l jS of F Y h i s A'));
$subjectMail = "Contact Form From $name | Examportal";
$body = "Name : $name <br/>
Email: $email <br/>
Message Title : $subject <br/>
Message : n $message
";
$contentHtml = '
<div style="font-family:Arial, Helvetica, sans-serif; font-size:12px; color:#333;">
<div style="color:#565656;">'.$body.'</div>
</div>
<div style="clear:both"></div>
';
$headersMail = '';
$headersMail .= 'From: ' ."noreply@emailexample.co.zarn" . 'Reply-To: ' . $fromMail . "rn";
$headersMail .= 'Return-Path: ' . $fromMail . "rn";
$headersMail .= 'MIME-Version: 1.0' . "rn";
$headersMail .= 'Content-Type: text/html; charset=ISO-8859-1' . "rn";
try {
if (mail($toMail, $subjectMail, $contentHtml, $headersMail)) {
$output = json_encode(array( //create JSON data
'type'=>'success',
'text' => 'Thank you for contacting us, we will get back to you real soon. :).'
));
die($output);
} else {
$output = json_encode(array( //create JSON data
'type'=>'error',
'text' => 'An unknown error occuredx. Please try again later.'
));
die($output);
}
} catch(Exception $e) {
$msg = $e->getMessage();
$output = json_encode(array( //create JSON data
'type'=>'error',
'text' => 'Error occur with message : '.$msg
));
die($output);
}
}
?>
验证任何空白字段的最简单和最简单的方法是在输入 HTML 中添加required，如下所示。
<form method="post" class="submitphoto_form" action="contact.php" id="contactpage">
<input type="text" class="form-control wpcf7-text" placeholder="Your name" name="name" id="name" required>
<input type="email" class="form-control wpcf7-email" placeholder="Email address" name="email" id="email" required>
<input type="text" class="form-control wpcf7-text" placeholder="Subject" name="subject" id="subject" required>
<textarea style="height:300px" class="form-control wpcf7-text" placeholder="What would you like to tell us" name="message" id="message" required></textarea>
<input type="submit" value="Submit" class="wpcf7-submit photo-submit" name="send" id="send">
</form>
另请注意，您输入的电子邮件类型应该是"电子邮件"而不是"邮件"。
使用 PHP 验证的缺点是用户必须重新输入所有字段。
使用 JS 验证的缺点是，如果用户禁用了 JS，则验证将不起作用。
使用简单HTML验证的好处是它可以在所有浏览器上运行，并在出现任何空字段和/或无效的电子邮件格式时停止表单提交。
使用此方法，不需要使用 JS 进行验证。它是纯 HTML。
希望这有帮助。