Jquery ajax使用json形式通信

前台JS

$.ajax({

                             type: 'post',

                             url: 'HandlerLogin.ashx',

                             data: { name: $( '#txtLoginName').val(), pwd: $('#txtPwd' ).val() },

                             dataType: 'json',

                             success: function (result) {

                                 loginAndRegDialog.dialog( 'close');

                                 $.messager.show({

                                     title: '提示',

                                     msg: '登陆成功'

                                 });

                             },

                             error: function (XmlHttpRequest, textStatus, errorThrown) {

                                 console.info(XmlHttpRequest);

                                 console.info(textStatus);

                                 console.info(errorThrown);

                             }

                         });

 

 

后台处理：

public class HandlerLogin : IHttpHandler

    {

 

        public void ProcessRequest(HttpContext context)

        {

            if (!string .IsNullOrEmpty(context.Request["name"]))

            {

                string name = context.Request["name" ];

                context.Response.Write(LoginValidate(name));

            }

            else {

                return;

            }

        }

 

        /// <summary>

        /// 根据登陆名判断时候存在该用户

        /// </summary>

        /// <param name="loginName"></param>

        /// <returns> 返回json字符串 </returns>

        private string LoginValidate(string loginName) {

            string json="" ;

            string constr = ConfigurationManager .ConnectionStrings["miceSysbase"].ToString();

            using (SqlConnection conn=new SqlConnection(constr))

            {

                string sql = "select * from Aut_User where LoginInfo='" + loginName + "'";

                SqlDataAdapter sa = new SqlDataAdapter(sql, conn);

                DataTable dt = new DataTable();

                sa.Fill(dt);

                if (dt.Rows.Count>0)

                {

                    DataRow dr = dt.Rows[0];

                    json = ViewToJsonData(dr);

                }

                else {

                    json = "{'false':[{'UserID':'','LoginInfo':'','UserName':'','CreateTime':''}]}" ;

                }

            }

            return json;

        }

 

        /// <summary>

        /// 根据查询结果序列化数据

        /// </summary>

        private string ViewToJsonData(DataRow dr)

        {

            string json = "{\"UserID\":\"" + dr["UserID"].ToString() + "\",\"LoginInfo\":\"" + dr["LoginInfo" ].ToString() + "\",\"UserName\":\"" + dr["UserName" ].ToString() + "\",\"CreateDate\":\"" + dr["CreateDate" ].ToString() + "\"}";

            return json;

        }

    }