随笔- 8 文章- 33 评论- 167 阅读- 33256

Asp.Net+Ajax 用户名检测

前台

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>无标题页</title>
<script language="javascript" type="text/javascript">
function CheckUserName()
{
var sUserName=document.getElementById("<%= tb_UserName.ClientID%>");
var sCheckInfo=document.getElementById("CheckInfo");
sCheckInfo.innerText="查询中……";

var objxml = new ActiveXObject("Microsoft.XMLHTTP");

objxml.open("GET","checkusername.aspx?username=" + sUserName.value,false);
objxml.send();

</head>
<body>
    <form id="form1" runat="server">
    <div>
    <asp:TextBox ID="tb_UserName" runat="server" TextMode="SingleLine" Width="180px" onBlur="CheckUserName()"></asp:TextBox><span id="CheckInfo"></span>
        <br />
        <asp:TextBox ID="TextBox1" runat="server" Width="179px"></asp:TextBox></div>
    </form>
</body>
</html>

后台 check.aspx

public partial class checkusername : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        string sUserName = Request.QueryString["username"].Trim().ToString();
        DataSet ds=new DataSet();
        ds = Maticsoft.DBUtility.DbHelperSQL.Query("SELECT count(*) from TB_USER where User_Name='"+sUserName+"'");
        int userCount = int.Parse(ds.Tables[0].Rows[0][0].ToString());
        Response.Clear();
        if (userCount == 0)
        {
            Response.Write("1");

        }
        else
        {
            Response.Write("0");
        }
        Response.End();
    }
}