ASP.NET中ajax验证用户名和邮箱是否重复

这个是前台显示的页面代码↓

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head runat="server">

    <title></title>

    <script language="javascript" type="text/javascript">

        function neihe() {//设置浏览器的内核

            if (window.ActiveXObject) {//如果是IE浏览器内核

                return new ActiveXObject("Microsoft.XMLHTTP");

            } else if (window.XMLHttpRequest) {//否则

                return new XMLHttpRequest();

            }

        }

        var XMLduixiang;

        function fasong(name) {

            if (name != "") {

                var url = encodeURI("houtai.aspx?chuandi=" + name); //encodeURI对URL编码

                XMLduixiang = neihe(); //创建XMLGTttpRequest

                XMLduixiang.onreadystatechange = huidiao; //回传处理结果(请求被发送到服务器时)

                XMLduixiang.open("GET", url, true); //初始化XMLGTttpRequest组件

                //最后的true（异步）或 false（同步）

                XMLduixiang.send(null);//发送请求

            }

        }

        function huidiao(){

            if(XMLduixiang.readyState== && XMLduixiang.status == ){

                var cljg = XMLduixiang.responseText;

                //responseText获得字符串形式的响应数据

                //responseXML获得 XML 形式的响应数据

                if(cljg=="true"){//如果返回真

                    document.getElementById("ts").style.display = "none";

                } else {//否则

                    document.getElementById("ts").style.display = "inline";

                }

            }

        }

    </script>

</head>

<body>

    <form id="form1" runat="server">

    <div>

        输入用户名：

        <input type="text"  onblur="fasong(this.value)" /><%--失去焦点--%>

        <span id="ts" style=" display:none; color:Red;">没有这个用户</span>

    </div>

    </form>

</body>

</html>

这个是后台页面的代码↓

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Data.SqlClient;

using System.Configuration;

public partial class houtai : System.Web.UI.Page

{

    string sjklj = ConfigurationManager.ConnectionStrings["ceshi"].ConnectionString;

    protected void Page_Load(object sender, EventArgs e)

    {

        Response.ContentType = "text/plain";//设置输出类型

        if (Request.QueryString["chuandi"] != null)

        {

            string name = Request.QueryString["chuandi"].ToString().Trim();

            if (name.Length>)

            {

                if (shifou(name))

                {

                    Response.Write("true");

                }

                else

                {

                    Response.Write("false");

                }

            }

            else

            {

                Response.Write("false");

            }

        }

        else

        {

            Response.Write("false");

        }

    }

    protected bool shifou(string name)

    {

        string sql = "select * from cs where name=@name";

        using (SqlConnection conn = new SqlConnection(sjklj))

        {

            conn.Open();

            SqlCommand cmd = new SqlCommand(sql, conn);

            cmd.Parameters.AddRange(new SqlParameter[] { new SqlParameter("@name", name) });

            if (cmd.ExecuteScalar() == null)

            {

                return false;

            }

            else

            {

                return true;

            }

        }

    }

}

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ASP.NET中ajax验证用户名和邮箱是否重复

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