注册验证

来源：互联网发布：程序员图编辑：程序博客网时间：2024/05/23 11:56

<body>
<script type="text/javascript">
        //与数据库交互获取信息
        var a;
        function showinfo(s) {
            var xmlHttp;
            xmlHttp = GetXmlHttpObject();
            if (xmlHttp == null) {
                alert("Browser does not support HTTP Request")
                return
            }
            a = s.value;//值

            document.getElementById("tb").style .display ="";
            xmlHttp.onreadystatechange = stateChanged;
            xmlHttp.open("GET", "reg1.aspx?a=" + escape(a), true);
            xmlHttp.send(null)
            function stateChanged() {
                if (xmlHttp.readyState == 4 || xmlHttp.readyState == "complete") {
                    var arr = xmlHttp.responseText.split('|')[0]; //中要|前的字符串显示提示
                  document .getElementById ("tb").innerHTML=arr;
                }
            }
        }

            //实例化XMLHttpRequest对象
            function GetXmlHttpObject() {
                var objXMLHttp = null
                if (window.XMLHttpRequest) {
                    objXMLHttp = new XMLHttpRequest()
                }
                else if (window.ActiveXObject) {
                    objXMLHttp = new ActiveXObject("Microsoft.XMLHTTP")
                }
                return objXMLHttp
            }
    </script>
    <form id="form1" runat="server">
注册名: <input type=text runat=server value =5 onblur="showinfo(this)"/>
显示名: <input type=text runat=server />

<span id=tb> </span>

</form>
</body>

判断页面 reg1.aspx
protected void Page_Load(object sender, EventArgs e)
        {
            if (!string.IsNullOrEmpty(Request.QueryString["a"]))
            {
                string name = Request.QueryString["a"];//输入的用户
                string str = ",lyk,user,aa,bb,cc,dd,";//从数据库中取出的用户名,具体的判断看你自己
                string result;
                if (!str.Contains("," + name + ","))
                {
                    result = "用户名可用!!";
                }
                else
                {
                    result = "用户名已用,请重新输入!!";
                }

Response.Clear();

Response.Write(result+"|");//输入到页面上,只显示|前面的字符串

}
}