using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
namespace AJAX
{
/// <summary>
/// LoginHandler 的摘要说明
/// </summary>
public class LoginHandler : IHttpHandler
{
public void ProcessRequest(HttpContext context)
{
context.Response.ContentType = "text/plain";
string UserName = context.Request["UserName"];
string UserPwd = context.Request["UserPwd"];
if (string.IsNullOrEmpty(UserName))
{
context.Response.Redirect("Login.html");
}
string sql = "select count(*) from Users where UserName=@u ";
SqlParameter[] p = { new SqlParameter("@u",UserName)};
int i = Convert.ToInt32(SQLHelper.ExecuteScalar(sql,p));
if (i==1)
{
context.Response.Write("1");
}
else
{
string s = "insert into Users (UserName,Pwd) values (@UserName,@p)";
SqlParameter[] sp = { new SqlParameter("@UserName",UserName),
new SqlParameter("@p",UserPwd)};
int j = Convert.ToInt32(SQLHelper.NonExQuery(s, sp));
if (j == 1)
{
context.Response.Write("0");
}
}
}
public bool IsReusable
{
get
{
return false;
}
}
}
}
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title></title>
<meta charset="utf-8" />
<script src="js/jquery-3.3.1.js"></script>
<script>
$(function () {
$("#UserName").blur(function () {
var UserName = $("#UserName").val();
$.post("LoginHandler.ashx", { "UserName": UserName},function (data) {
if (data == "1") {
$('#btn').attr('disabled',"true");
alert("已经注册过了");
}
else {
$('#btn').removeAttr("disabled");
}
});
});
$("#btn").click(function () {
var UserName = $("#UserName").val();
var UserPwd = $("#UserPwd").val();
$.post("LoginHandler.ashx", {"UserName": UserName, "UserPwd": UserPwd }, function (data) {
if (data == "0") {
alert("注册成功！");
}
})
})
});
</script>
</head>
<body>
用户名：<input type="text" name="UserName" id="UserName" />
<br />
密 码：<input type="password" name="UserPwd" id="UserPwd" />
<br />
<input type="button" value="注册" id="btn" />
</body>
</html>