【2017-6-5】AJAX 基本结构

AJAX - 网页数据异步加载

1、ashx - 一般处理程序

2、在不同的语言之间传递数据
xml - 可扩展的标记语言
json - 数据格式
对象格式："{"key":"value","key":"value"}"
数组格式："[{"key":"value"},{},{}]"

示例：

 public void ProcessRequest(HttpContext context)
    {
        StringBuilder str = new StringBuilder();//创建一个StringBuilder
        str.Append("[");//添加方式.Append

        using (DataClassesDataContext con = new DataClassesDataContext())
        {
            List<Users> ulist = con.Users.ToList();
            int count = 0;
            foreach (Users u in ulist)
            {
                if (count > 0) str.Append(",");//判断如果大于0，就在前面加逗号，原因是格式固定，最后不能有逗号
                str.Append("{"username":"" + u.UserName + "","password":"" + u.PassWord + "","nickname":"" + u.NickName + "","sex":"" + u.Sex + "","birthday":"" + u.Birthday + "","nation":"" + u.Nation + ""}");
                count++;
            }
        }

        str.Append("]");

        context.Response.Write(str);
        context.Response.End();
    }

3、jqeury.ajax基本结构

<script type="text/javascript">

    $("#btn1").click(function () {
        $.ajax({
            url: "../Handler2.ashx",//提交到哪个服务端
            data: {},//传的数据，有的话就是{“”：“”}，没有就{}
            type: "post",//用什么样的方式提交
            dataType: "json",//返回的数据格式
            success: function (msg) {//成功走这
                $("#tbody1").html("");//清空
                for (var i = 0; i < msg.length; i++) {
                    var str = "  <tr style="background-color: white;">"
                    str += " <td>" + msg[i].username + "</td>";
                    str += "<td>" + msg[i].password + "</td>";
                    str += " <td>" + msg[i].nickname + "</td>";
                    str += " <td>" + msg[i].sex + "</td>";
                    str += " <td>" + msg[i].birthday + "</td>";
                    str += " <td>" + msg[i].nation + "</td>";
                    str += "</tr>";
                    $("#tbody1").append(str);//添加
                }

            },
            error: function () {//不成功走这
                alert('err');
            }
        });

    });



</script>