我一直在努力验证表单，并使JS和PHP验证工作正常，但我仍然很难添加ajax（带或不带JQUERY）来提交到PHP文件并返回成功消息。
我的CSS和JS验证表单：
<html>
<head>
<style type="text/css">
#nameerror {
color:red;
}
#emailerror{
color:red;
}
</style>
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.9.0/jquery.min.js"></script>
<script type="text/javascript">
function Validate() {
var email = document.forms['form']['email'].value;
var atpos = email.indexOf('@');
var dotpos = email.lastIndexOf('.');
var name = document.forms['form']['name'].value;
if (name == null || name == ""){
document.getElementById('nameerror').innerHTML="Please enter your name";
return false;
} else if (atpos < 1 || dotpos < atpos+2 || dotpos+2 >= email.length) {
document.getElementById('emailerror').innerHTML="Please enter a valid email";
return false;
} else {
}
}
</script>
</head>
<body>
<div>Sign Up</div>
<form name="form" action="form_validation.php" id="form" onsubmit="return Validate();" method = 'post'>
<label>Name:</label><br/>
<input id='name' type="text" name='name' /><br/>
<span id="nameerror"></span><br/>
<label>Email:</label><br/>
<input type='text' name='email' id = 'email'/> <br/>
<span id= "emailerror"></span><br/>
<label>Comments:</label><br/>
<textarea name='comments' id ='comments'></textarea><br/>
<span id="comerror"></span>
<input type="submit" name="submit" value="Submit"/>
<span id="success" style="display:none">Your message has been sent successfully.</span>
</form>
</body>
</html>
这是form_validation.php：
<?php
if(isset($_POST['submit'])){
if($_POST['name']){
$name = $_POST['name'];
}
if(!preg_match('/^[a-zA-Z's]+$/', $name)){
echo "Name can only contain letters.";
return false;
} else {
echo "Name accepted";
}
if($_POST['email']){
$email = $_POST['email'];
}
$pattern = '/^[_a-z0-9-]+('.[_a-z0-9-]+)*@[a-z0-9-]+('.[a-z0-9-]+)*('.[a-z]{2,3})$/';
if(!preg_match($pattern, $email)){
echo "Please enter a valid email address.";
return false;
} else {
echo "Email Valid";
}
if($_POST['comments']){
$comments = $_POST['comments'];
}
if (strlen($comments) > 100){
echo "please enter less than 100 characters.";
return false;
}
}
?>
谢谢你的帮助！
$('form').on('submit',function() {
$.ajax({
url: 'form_validation.php',
data: $(this).serialize(),
type: 'POST'
}).done(function(data){
// you can append a success message to your document here
});
});