案例（用封装的ajax函数检查用户名）

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");

 

posted @ 2015-07-30 11:04  黄者之风  阅读(264)  评论(0)    收藏  举报