使用Jquery搭建最佳用户体验的登录页面之记住密码自动登录功能（含后台代码）

var wrongTypeName, //用户名的错误类型，可以直接作为错误提示信息数组的下标
wrongTypePwd, //用户密码的错误类型
wrongNameHtml = new Array("", "请输入用户名", "用户名长度太短", "用户名长度超过12位", "您的用户名或密码错误", "超时，请重新登陆"),
wrongPwdHtml = new Array("", "请输入密码", "密码长度小于6位", "", "密码中含有非法字符"),
editPass=false;

$(".btn-submit").click(function () {
wrongTypeName = 0;
wrongTypePwd = 0;
var uname = $("#uname").val(), //用户名
pwd = $("#passwd").val(), //用户密码
plength = pwd.length,
nlength = uname.length; //长度
if (nlength == 0)
wrongTypeName = 1;
if (nlength > 0 && nlength < 2)
wrongTypeName = 2;
if (nlength > 20)
wrongTypeName = 3;
if (plength == 0)
wrongTypePwd = 1; //这里是对用户名和密码长度的一个判断，并获取错误信息数组的下标。
else {
var patrn = /^(\w){6,20}$/;
if (plength < 6)
wrongTypePwd = 2;
if (plength > 50)
wrongTypePwd = 3;
if (plength > 6 && plength < 20) {
if (!patrn.exec(pwd))
wrongTypePwd = 4; //这里是对用户密码合法性的前端判断，并返回错误数组的下标
}
}

inputTip(0, wrongNameHtml, wrongTypeName);
inputTip(1, wrongPwdHtml, wrongTypePwd);

if (wrongTypePwd == 0 && wrongTypeName == 0) {//在用户输入信息完全合法的情况下，即数组下标全部为0 开始执行ajax验证
//alert($.cookie("logout"));
if(editPass){
pwd = $.md5(pwd);
}
$("#passwd").val(pwd);
$("#login-form input").attr('disabled', true);
$('.remember').unbind('click');
//已经向服务器提交了信息，所以将页面上的所有输入框按钮设置成不可用状态，这样可以有效的避免重复提交
var remb = $('#remember-long').val();
ajaxCheck(uname, pwd, remb);
}
});

var ajaxCheck = function (uname, pwd, remb) {
$(".btn-master").addClass("visibility");
var $params = "user_name=" + decodeURI(uname) + "&user_pwd=" + decodeURI(pwd) + "&remember=" + decodeURI(remb);
$.ajax({
type: 'POST',
url: 'CheckUserLogin.aspx',
//async: false,
cache: false,
dataType: 'json'
data: $params,
success: function (data, status) {
wrongTypeName = data.wrongTypeName;
wrongTypePwd = data.wrongTypePwd;
var loginSuccess = data.loginSuccess; //获取服务器返回的json数据
if (loginSuccess == 0) {
if ($('#remember-long').val() == 1) {//记住密码
$.cookie('UserName', uname, { expires: 7, path: '/' });
$.cookie('Password', pwd, { expires: 7, path: '/' });
}
else if ($('#remember-long').val() == 0) {//取消记住的密码，或者没有记住密码
$.cookie('UserName', null,{ expires: 7, path: '/' });
$.cookie('Password', null,{ expires: 7, path: '/' });
}
location.href = "/Members/Members.html"
}
else {
$(".btn-master").removeClass("visibility");
$("#login-form input").attr('disabled', false);
inputTip(0, wrongNameHtml, wrongTypeName);
inputTip(1, wrongPwdHtml, wrongTypePwd);
}
},
error: function () {
wrongTypeName = 5;
inputTip(0, wrongNameHtml, wrongTypeName);
$("#login-form input").attr('disabled', false);
$('.remember').bind('click', function () { checkClick(); });
$(".btn-master").removeClass("visibility");
}
})
}

var rememberPassword = function (logout) {//页面加载完成之后执行自动登录检查
var ckname = $.cookie('UserName');
var ckpwd = $.cookie("Password");
if (ckname != "" && ckpwd != "" && ckname != null && ckpwd != null) {
$('#remember-long').val("1")
$('#remember-long').attr('checked', true);
$("#uname").val(ckname); //用户名
$('.reg-item').addClass('focus');
if (logout=="safe"){
$.cookie("logout","",{ expires: 1, path: '/' })
}
else{
$("#passwd").val(ckpwd); //用户密码
$(".btn-submit").trigger('click'); //自动登录
}
}
else {
$('#remember-long').val("0")
$('#remember-long').attr('checked', false);
}
}

var logout = $.cookie("logout");
　　　　//判断用户是否是从内部退出还是直接打开
//如果是从内部退出，那么就不能再次自动登录进去，除非用户刷新了页面
rememberPassword(logout);

$(function () {

var wrongTypeName, //用户名的错误类型，可以直接作为错误提示信息数组的下标
wrongTypePwd, //用户密码的错误类型
wrongNameHtml = new Array("", "请输入用户名", "用户名长度太短", "用户名长度超过12位", "您的用户名或密码错误", "超时，请重新登陆"),
wrongPwdHtml = new Array("", "请输入密码", "密码长度小于6位", "", "密码中含有非法字符"),
editPass=false;

$('body').focus(); //让输入框不再自动获取焦点

$('.reg-action .reg-input').each(function () {
var items = $(this).parent('.reg-item');
if ($(this).val()) {
items.addClass("focus");
}
$(this).bind('focus blur', function (event) {
var type = event.type; //获取事件类型
if($(this).attr("id")=="passwd"){
editPass = true;
}
if (type == 'focus') {
if (items.hasClass('error')) {
$(this).val("");
items.removeClass('error');
}
items.addClass('focus');
} else if (!$(this).val()) {
items.removeClass('focus');
}
})
});

$(".btn-submit").click(function () {
wrongTypeName = 0;
wrongTypePwd = 0;
var uname = $("#uname").val(), //用户名
pwd = $("#passwd").val(), //用户密码
plength = pwd.length,
nlength = uname.length; //长度
if (nlength == 0)
wrongTypeName = 1;
if (nlength > 0 && nlength < 2)
wrongTypeName = 2;
if (nlength > 20)
wrongTypeName = 3;
if (plength == 0)
wrongTypePwd = 1; //这里是对用户名和密码长度的一个判断，并获取错误信息数组的下标。
else {
var patrn = /^(\w){6,20}$/;
if (plength < 6)
wrongTypePwd = 2;
if (plength > 50)
wrongTypePwd = 3;
if (plength > 6 && plength < 20) {
if (!patrn.exec(pwd))
wrongTypePwd = 4; //这里是对用户密码合法性的前端判断，并返回错误数组的下标
}
}

inputTip(0, wrongNameHtml, wrongTypeName);
inputTip(1, wrongPwdHtml, wrongTypePwd);

if (wrongTypePwd == 0 && wrongTypeName == 0) {//在用户输入信息完全合法的情况下，即数组下标全部为0 开始执行ajax验证
//alert($.cookie("logout"));
if(editPass){
pwd = $.md5(pwd);
}
$("#passwd").val(pwd);
$("#login-form input").attr('disabled', true);
$('.remember').unbind('click');
//已经向服务器提交了信息，所以将页面上的所有输入框按钮设置成不可用状态，这样可以有效的避免重复提交
var remb = $('#remember-long').val();
ajaxCheck(uname, pwd, remb);
}
});

var inputTip = function (index, tipHtml, tipNum) {
$(".reg-tip").eq(index).html(tipHtml[tipNum]);
if (tipNum > 0)
$(".reg-item").eq(index).addClass("error");
else
$(".reg-item").eq(index).removeClass("error");
} //定义错误提示信息页面显示函数。由于页面只有两个输入框所以我这里直接指定了index，如果页面上有很多，可以使用$(this).index()

var ajaxCheck = function (uname, pwd, remb) {
$(".btn-master").addClass("visibility");
var $params = "user_name=" + decodeURI(uname) + "&user_pwd=" + decodeURI(pwd) + "&remember=" + decodeURI(remb);
$.ajax({
type: 'POST',
url: 'CheckUserLogin.aspx',
//async: false,
cache: false,
dataType: 'json',
data: $params,
success: function (data, status) {
wrongTypeName = data.wrongTypeName;
wrongTypePwd = data.wrongTypePwd;
var loginSuccess = data.loginSuccess; //获取服务器返回的json数据
if (loginSuccess == 0) {
if ($('#remember-long').val() == 1) {//记住密码
$.cookie('UserName', uname, { expires: 7, path: '/' });
$.cookie('Password', pwd, { expires: 7, path: '/' });
}
else if ($('#remember-long').val() == 0) {//取消记住的密码，或者没有记住密码
$.cookie('UserName', null,{ expires: 7, path: '/' });
$.cookie('Password', null,{ expires: 7, path: '/' });
}
location.href = "/Members/Members.html"
}
else {
$(".btn-master").removeClass("visibility");
$("#login-form input").attr('disabled', false);
inputTip(0, wrongNameHtml, wrongTypeName);
inputTip(1, wrongPwdHtml, wrongTypePwd);
}
},
error: function () {
wrongTypeName = 5;
inputTip(0, wrongNameHtml, wrongTypeName);
$("#login-form input").attr('disabled', false);
$('.remember').bind('click', function () { checkClick(); });
$(".btn-master").removeClass("visibility");
}
})
}

var checkClick = function () {
if ($('#remember-long').attr('checked')) {
$('#remember-long').attr('checked', false);
$('#remember-long').val("0")
}
else {
$('#remember-long').attr('checked', true);
$('#remember-long').val("1")
}
}
$('.remember').bind('click', function () { checkClick(); });
$("#remember-long").click(function () { checkClick(); });
//记住登录的checkbox和label点击的绑定。

if ($.browser.msie && $.browser.version == "6.0") {
//帮助微软消灭ie6
if ($.cookie('masterShow') != "hidden")
$('body').append('<div class="master"><p>您的浏览器是<strong>IE6.0</strong>，漏洞较多，用户体验较差，微软官方将要放弃支持，为了自身电脑安全和获取最佳用户体验建议你根据自身需求升级至<a href="http://windows.microsoft.com/zh-CN/internet-explorer/downloads/ie-8" target="_blank" class="red"><strong>IE8.0</strong></a>以上版本或者使用<a href="http://firefox.com.cn/" target="_blank" class="red"><strong>火狐</strong></a>浏览器</p></div><div class="m-close m-close-short">关闭</div><div class="m-close m-close-long">不再显示</div>');
$(".master").delay(1000).slideDown('', function () {
$(".m-close").fadeIn();
});
$(".m-close-short").click(function () {
$(".m-close").fadeOut('', function () {
$(".master").slideUp();
});
});
$(".m-close-long").click(function () {
$(".m-close").fadeOut('', function () {
$(".master").slideUp();
$.cookie('masterShow', 'hidden');
});
});
}

var rememberPassword = function (logout) {//页面加载完成之后执行自动登录检查
var ckname = $.cookie('UserName');
var ckpwd = $.cookie("Password");
if (ckname != "" && ckpwd != "" && ckname != null && ckpwd != null) {
$('#remember-long').val("1")
$('#remember-long').attr('checked', true);
$("#uname").val(ckname); //用户名
$('.reg-item').addClass('focus');
if (logout=="safe"){
$.cookie("logout","",{ expires: 1, path: '/' })
}
else{
$("#passwd").val(ckpwd); //用户密码
$(".btn-submit").trigger('click'); //自动登录
}
}
else {
$('#remember-long').val("0")
$('#remember-long').attr('checked', false);
}
}

var logout = $.cookie("logout");//判断用户是否是从内部退出
rememberPassword(logout);

$(document).bind('keydown', 'return', function () { $(".btn-submit").trigger('click'); });
})

Hashtable ht = new Hashtable();
string uname = Request.Params["user_name"];
string pwd = Request.Params["user_pwd"];
int wrongTypeName = 0;
int wrongTypePwd = 0;
uname = PageValidate.InputText(uname, 30);

if (Validator.StrIsNullOrEmpty(uname))
{
wrongTypeName = 1;
}
if (Validator.StrIsNullOrEmpty(pwd))
{
wrongTypePwd = 1;
}
if (!string.IsNullOrEmpty(uname) && !string.IsNullOrEmpty(pwd))
{
//以下使用常量来做演示：
string userName="ethan.zhu";
string password ="";//需要MD5加密之后的字符串
if (uname==userName&&password==pwd )
ht.Add("loginSuccess", 0);
else
wrongTypeName = 4;//返回用户名或密码错误

if (wrongTypeName > 0 || wrongTypePwd > 0)
{
ht.Add("wrongTypeName", wrongTypeName);
ht.Add("wrongTypePwd", wrongTypePwd);
}
Response.Write(CreateJsonParams(ht));
}
Response.End();
}

public static string CreateJsonParams(Hashtable items)
{
string returnStr = "";
foreach (DictionaryEntry item in items)
{
returnStr += "\"" + item.Key.ToString() + "\":\"" + item.Value.ToString() + "\",";
}
return "{" + returnStr.Substring(0, returnStr.Length - 1) + "}";

}