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本程序主要功能是检查用户输入的用户名是否在检查的范围之内
CheckUserName.htm代码：
<head>
<title></title>
<script src="jquery-1.8.3.js" type="text/javascript"></script>
<script src="MyAjax.js" type="text/javascript"></script>
<script type="text/javascript">
$(function () {
$("#username").blur(function () {
var username = $("#username").val();
MyAjax("CheckUserName.ashx?username=" + username,
function (resTxt) { //resTxt为response返回的结果
if (resTxt == "ok") {
$("#msg").text("用户名可用");
}
else {
var strs = resTxt.split("|"); //对response返回的结果进行分割
$("#msg").text(strs[1]);
}
},
function (status) {
$("#msg").text("服务器出现" + status + "错误");
});
});
});
</script>
</head>
<body>
<input type="text" id="username" /><span id="msg"></span>
</body>
CheckUserName.ashx代码：
public void ProcessRequest(HttpContext context) { context.Response.ContentType = "text/html"; string username = context.Request["username"]; if (string.IsNullOrEmpty(username)) { context.Response.Write("error|用户名必填"); return; } if (username.Length < 3 || username.Length >= 10) { context.Response.Write("error|用户名必须在3-10之间"); return; } if (username.Contains("毒") || username.Contains("枪")) { context.Response.Write("error|含有违禁词汇"); return; } int r = (int)SQLHelper.ExecuteScalar("select count(*) from User where name=@name", new SqlParameter { ParameterName="@name",Value=username}); if (r > 0) { context.Response.Write("error|用户名已被使用"); return; } context.Response.Write("ok");
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原文地址：http://www.cnblogs.com/genesis/p/4688657.html
