http://ment!");
});
});
</script>
</head>
加上jquery.form组件后，提交表单时，页面不会再同步提交，而是由js做异步提交，因此提交后页面不会有刷新。

3. 加入能够与服务器端进行交互的回调函数。
复制代码 代码如下:
$(document).ready(function () {
//options是一个ajaxForm的配置对象。?
var options = {
//target: '#output1', // target element(s) to be updated with server response
//beforeSubmit: showRequest, // pre-submit callback
<FONT color=#ff0000> success: callBackFunc // post-submit callback</FONT>

// other available options:
//url: url // override for form's 'action' attribute
//type: type // 'get' or 'post', override for form's 'method' attribute
//dataType: null // 'xml', 'script', or 'json' (expected server response type)
//clearForm: true // clear all form fields after successful submit
//resetForm: true // reset the form after successful submit

// $.ajax options can be used here too, for example:
//timeout: 3000
};

// bind form using 'ajaxForm'
$('#myForm').ajaxForm(options);
});

// responseText是服务端的响应值。statusText是页面

// 提交状态值，success表示成功。
function callBackFunc(responseText, statusText) {
if (statusText == 'success') {
alert(responseText);
}

else{

alert(“服务端错误！”);

}
}

如果返回的是json数据则回调函数可以这么写
function resultFunction(responseText,statusText) {
if (statusText == 'success') {
if (responseText.code == 1) {
alert(responseText.message);
}
else {
alert('error occurs!');
}
}
else {
alert('服务器错误！');
}
}

服务端的代码如下：
复制代码 代码如下:
[HttpPost]
public ActionResult AjaxForm(FormCollection form)
{
string message = "Name:" + form["username"] + " PWD: "+form["password"] ;
//return Content(message);
return Json(new { code = 1, message = message });
}

4. 加入提交前的数据校验函数
为options对象添加 beforeSubmit属性
复制代码 代码如下:
var options = {
//target: '#output1', // target element(s) to be updated with server response
<FONT color=#ff0000>beforeSubmit: checkData, // pre-submit callback
</FONT> success: callBackFunc // post-submit callback

// other available options:
//url: url // override for form's 'action' attribute
//type: type // 'get' or 'post', override for form's 'method' attribute
//dataType: null // 'xml', 'script', or 'json' (expected server response type)
//clearForm: true // clear all form fields after successful submit
//resetForm: true // reset the form after successful submit

// $.ajax options can be used here too, for example:
//timeout: 3000
};
// pre-submit callback
function checkData(formData, jqForm, options) {
// formData is an array; here we use $.param to convert it to a string to display it
// but the form plugin does this for you automatically when it submits the data
//var queryString = $.param(formData);

// jqForm is a jQuery object encapsulating the form element. To access the
// DOM element for the form do this:
var formElement = jqForm[0];

//alert('About to submit: \n\n' + queryString);

// here we could return false to prevent the form from being submitted;
// returning anything other than false will allow the form submit to continue
//return true;
if ($(formElement).find("#username").val() == "") {
alert("please enter username!");
return false;
} else {
return true;
}
}

验证用户名是否为空，是则提示输入，并取消表单提交。