在MVC3里面——程序集 System.Web.Mvc.dll, v4.0.30319有这么一个Ajax.BeginForm异步登录验证的类型，我们在下面给出一个例子：
在登录页面Logion.cshtml。使用@using (Ajax.BeginForm("Login", "Home", new AjaxOptions { HttpMethod = "Post", OnSuccess = "tips", OnBegin = "return ValidateLog()" }))｛提交Form内容｝，HttpMethod="提交方式"，OnBegin="return validateLog()"是开始提交前，对Form表单的js验证。我们直接在javascript里面写validateLog()的js验证函数就可以了。OnSuccess = "tips"是Form表单成功提交到这个控制器后，然后再根据页面上的javascript函数tips(data)和它的返回值data，判断控制器里面回传过来的JsonResult值，是"true"还是"flase"。
[HttpPost]
public JsonResult Login(FormCollection collection){
string userName = collection["UserName"];
string passWord = collection["passWord"];
//经过数据库判断用户是否存在
//该用户有何权限
//用户和权限保存Session等等处理
JsonResult json = new JsonResult();
json.Data = new Json{result="true"}; //给JsonResult对象赋值，登录结果是否通过
return json //返回json值
}
1、用户登录页面Logion.cshtml
@{
ViewBag.Title = "登录";
Layout = null;
}
<!DOCTYPE html>
<html>
<head>
<link href="/Style/index.css" rel="stylesheet" type="text/css" />
<title>登录</title>
<script src="/Scripts/jquery-1.5.1.min.js" type="text/javascript"></script>
<script src="/Scripts/PleatedEffects.js" type="text/javascript"></script>
<script src="/Scripts/RenzoManage.js" type="text/javascript"></script>
<script src="/Scripts/MicrosoftAjax.js" type="text/javascript"></script>
<script src="/Scripts/MicrosoftMvcAjax.js" type="text/javascript"></script>
<script src="/Scripts/jquery.unobtrusive-ajax.min.js" type="text/javascript"></script>
<script type="text/javascript">
//登录验证
function ValidateLog() {
if (document.getElementById('userName').value == "" || document.getElementById('userName').value.length == 0) {
alert('用户名不能为空');
document.getElementById('userName').focus();
return false;
}
if (document.getElementById('passWord').vaule == "" || document.getElementById('passWord').value.length == 0) {
alert('密码不能为空');
document.getElementById('passWord').focus();
return false;
}
}
//登录回调函数
function tips(data) {
try {
if (data.result == "false") {
alert("用户名和密码错误");
}
else {
location.href = '/Home/Index';
}
} catch (e) {
alert('异常错误');
}
}
</script>
</head>
<body>
<div id="top">
<div class="topbg">
<div class="main_logo_wrap">
<a href="#" class="logo" target="_blank" title="易乐国际">易乐国际</a></div>
<div class="nav">
<div class="floatright">
<a href="#" class="font01 marginright45 btn_time_a">@(DateTime.Now.GetDateTimeFormats('D')[1].ToString())</a>
</div>
</div>
</div>
</div>
<div id="content" class="c">
<div class="rightcontents">
<div class="righttopbg right_wrap">
<div class="righttopword">
您所在的位置: <a href="#">用户登录</a>
</div>
</div>
<div class="righttable">
@using (Ajax.BeginForm("Login", "Home", new AjaxOptions { HttpMethod = "Post", OnSuccess = "tips", OnBegin = "return ValidateLog()" }))
{
<table border="0" cellpadding="0" cellspacing="0" class="chaxunbiaoge search_wh">
<tr>
<td height="55px" width="80px" align="right">
用户名:
</td>
<td width="175px">
<input type="text" name="userName" id="userName" class=" biaogechaxunkuang" tabindex="1"/>
</td>
<td>
<span class="colore6080d marginleft10">*</span> <span class="spanUserName"></span>
</td>
</tr>
<tr>
<td height="55px" align="right">
密码:
</td>
<td>
<input type="password" name="passWord" id="passWord" class=" biaogechaxunkuang" tabindex="2"/>
</td>
<td>
<span class="colore6080d marginleft10">*</span><span class="spanPassWord"></span>
</td>
</tr>
<tr>
<td height="55px" align="right">
</td>
<td>
<input name="btnlogin" type="submit" class="marginleft10 btn_dl" value="登录" tabindex="3" style="margin-top: 14px;" />
</td>
<td>
</td>
</tr>
</table>
}
</div>
</div>
</div>
<div class=" clearfloat">
</div>
<div id="bottom">
<div class="bottomwenzi">
<span class="floatright">后台管理系统</span></div>
</div>
</body>
</html>
2、用户登录控制器
///<summary>
///用户登陆
///</summary>
///<param name="collection"></param>
///<returns></returns>
[HttpPost]
public JsonResult Login(FormCollection collection)
{
string userName = collection["userName"];
string passWord = collection["passWord"];
JsonResult json = new JsonResult();
try
{
Users user = UserManage.GetUser(userName, passWord);
if (user != null)
{
Session["LoginUser"] = user;
Roles role = AuthorityManage.GetRoleById(Convert.ToInt32(user.RoleID));
Session["AllowAuthority"] = role.AllowAuthority;
//Session["AllowMenu"] = role.AllowMenu; //2013116
Session["RolesInfo"] = role;
int i = LogRecordsManage.Insert(new LogRecords() { LogMessage = role.Name + user.Username + "于" + DateTime.Now.ToString() + "登录", OperateID = user.ID, OperateTime = DateTime.Now, OperateType = 8 });
//json.Data = new { result = "true" };
json.Data = new { result = "false" };
}
else
{
json.Data = new { result = "false" };
}
}
catch (Exception ex)
{
Logs.AppLogs log = new Logs.AppLogs("Casino", "Login", userName, 2, ex.Message);
log.Insert();
CasinoWeb.Helper.LogMessage.SaveError(ex);
}
return json;
}