无刷新验证用户是否存在

WebService.cs

[WebMethod]

public string SelectUser(string strUser)

{

SqlConnection conn = new SqlConnection(strcon);

SqlCommand cmd = conn.CreateCommand();

cmd.CommandText = "select PUBLISHER from ArticleInfo where
PUBLISHER=@name";

cmd.Parameters.AddWithValue("@name", strUser);

conn.Open();

object obj = cmd.ExecuteScalar();

string strMessage;

if (strUser ==Convert.ToString(obj))

{

strMessage = "true";

}

else

{

strMessage = "false";

}

return strMessage;

}

注册页面

<script type="text/javascript">

$(function () {

$('#PostButton').click(function () {

WebService.SelectUser($('#UserName').val(), onSuccess, onFailed);

function onSuccess(result) {

if (result == 'true') {

$('#Message').html('对不起，用户名已存在');

}

else if(result=='false'){

$('#Message').html('输入正确');

}

}

function onFailed() {

alert('调用失败');

}

})

})

</script>

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

<asp:ScriptManager ID="ScriptManager1" runat="server">

<Services>

<asp:ServiceReference Path="~/WebService.asmx" />

</Services>

</asp:ScriptManager>

<input id="UserName" type="text" />

<input id="PostButton" type="button" value="注 册" /><br />

<div id="Message">

</div>

</form>