>我有一个表单，在将其发送到PHP之前，我正在做一些验证JavaScript，验证后的JavaScript函数会在页面底部的<p>标签中发布用户输入的文本;但是，此消息会短暂显示，然后消失...
如何使消息保留在页面中，并将其余数据发送到 PHP 脚本？
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<!-- The above 3 meta tags *must* come first in the head; any other head content must come *after* these tags -->
<title>Contact Us</title>
<!-- Bootstrap -->
<link href="bootstrap.min.css" rel="stylesheet">
<!-- stylesheet for this form -->
<link href="contact-stylesheet.css" rel="stylesheet">
<!-- HTML5 shim and Respond.js for IE8 support of HTML5 elements and media queries -->
<!-- WARNING: Respond.js doesn't work if you view the page via file:// -->
<!--[if lt IE 9]>
<script src="https://oss.maxcdn.com/html5shiv/3.7.2/html5shiv.min.js"></script>
<script src="https://oss.maxcdn.com/respond/1.4.2/respond.min.js"></script>
<![endif]-->
<script type="text/javascript">
function validateForm() {
var message = "";
var letters = /^[A-Za-z]+$/;
var name = document.forms["myForm"]["name"].value;
var email = document.forms["myForm"]["email"].value;
var subject = document.forms["myForm"]["subject"].value;
var text = document.forms["myForm"]["text"].value;
var outputMsg = "";
if (name == null || name == "") {
message += "name field missing!n";
}
if (name != "" && !name.match(letters)) {
message += "Invalid name: only letters allowed!n";
}
if (subject == null || subject == "") {
message += "Subject field is empty!n";
}
if (text == null || text == "") {
message += "Text field is empty!n";
}
if (message != "" ) {
alert(message);
return false;
}
outputMsg = "Message Sent!....n" +
"Name: " + name + "n" +
"Email: " + email + "n" +
"Subject: " + subject + "n" +
"Text: " + text + "n";
document.getElementById("msg-result").innerHTML = outputMsg;
return true;
}
</script>
</head>
<body>
<div class="row">
<div class="hero-unit" style="padding:20px 100px">
<h1>Contact Us</h1>
<p>aldkfjasdkfjaskdfasdfkasdkfjadsfjsdkfjaskfjasdkfjasjfaskdfjsdkfjsksdsdkjsd</p>
</div>
<div class="col-sm-6">
<div class="my-form">
<form class="form-horizontal" name="myForm" action="" onsubmit="validateForm()" method="post">
<div class="form-group">
<label for="inputEmail3" class="col-sm-2 control-label">Name:</label>
<div class="col-sm-8">
<input type="name" name="name" class="form-control" id="inputEmail3" placeholder="Name">
</div>
</div>
<div class="form-group">
<label for="inputPassword3" class="col-sm-2 control-label">Email:</label>
<div class="col-sm-8">
<input type="email" name="email" class="form-control" id="inputPassword3" placeholder="Email">
</div>
</div>
<div class="form-group">
<label for="inputPassword3" class="col-sm-2 control-label">Subject:</label>
<div class="col-sm-8">
<input type="text" name="subject" class="form-control" placeholder="Subject">
</div>
</div>
<div class="form-group">
<label for="inputPassword3" class="col-sm-2 control-label">Text:</label>
<div class="col-sm-8">
<textarea name="text" class="form-control" rows="7" placeholder="Text"></textarea>
</div>
</div>
<div class="form-group">
<div class="col-sm-offset-2 col-sm-10">
<button type="submit" class="btn btn-default">Send</button>
</div>
</div>
</div>
</form>
</div>
<div class="col-sm-6">
<div style="width:500px;heigth:350px;border:solid 1px brown">
<h1>GOOGLE MAP HERE!</h1>
</div>
<!-- <img sytle="padding:0px 20px" src="https://maps.googleapis.com/maps/api/staticmap?center=Miami+Downtown,Miami,FL&zoom=13&size=500x350&maptype=roadmap&markers=color:red%7CMiami+Downtown,Miami,FL"> -->
</div>
</div>
<div class="col-sm-6" style="padding:10px 140px">
<p id="msg-result"></p>
<!-- display form result message here! -->
</div>
<!--
Welcome <?php echo $_POST["name"]; ?><br>
Your email address is: <?php echo $_POST["email"]; ?>
-->
<!-- jQuery (necessary for Bootstrap's JavaScript plugins) -->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.2/jquery.min.js"></script>
<!-- Include all compiled plugins (below), or include individual files as needed -->
<script src="js/bootstrap.min.js"></script>
</body>
</html>
这是因为您正在更新字段中的文本，然后提交给php（自页面刷新以来擦除所有字段）。您可以设置隐藏元素来保存要显示的值，以便它们发布到 php，然后您可以将它们回显到您想要的位置。另一种方法是对 php 进行 ajax 调用以进行更新，而不是回发到同一页面。
所以使用 ajax，你会做这样的事情：
formSubmit()
{
//do validation
//do a jquery post to a php page
$.ajax
({
type: "POST",
//the url of the php page
url: 'test.php',
dataType: 'json',
async: false,
//json object to sent to the authentication url
data: '{"test": "info"}',
success: function (result) {
//update stuff
}
})
return false;
}
我认为表格是在检查后提交的。您必须返回结果（如果 validateForm（） 为 false，则取消提交）：
onsubmit="return validateForm();"
或防止默认值：
onsubmit="return validateForm(event);"
跟
function validateForm(event) {
...
event.preventDefault();