Jquery操作Json格式的数据在我们平时的项目中也经常运用；最近看Jquery权威指南中就有一章节是对这方面的整理总结；最后通过一个Asp.net结合一般处理程序ashx的实例，基本上能满足项目中平时遇到的问题；
1：Json格式在JS中直接通过"对象.属性名称"就可以进行访问；
<head> <title>jQuery 读取JSON 数据</title>
<script src="JScript/jquery-1.8.2.min.js"
type="text/javascript"></script>
<script type="text/javascript">
var
objInfo = {
‘name‘: ‘踏浪帅‘,
‘sex‘: ‘男‘,
‘Age‘: ‘20‘
};
$(function() {
$("#Button1").click(function() {
var
strHTML = "";
strHTML += "姓名："
+ objInfo.name + "<br>";
strHTML += "性别："
+ objInfo.sex + "<br>";
strHTML += "年龄："
+ objInfo.email + "<hr>";
$("#Tip").html(strHTML);
}); ;
});
</script>
</head><body> <div class="iframe">
<div class="title">
<input id="Button1"
type="button"
class="btn"
value="获取数据"
/>
</div>
<div class="content">
<div id="Tip"></div>
</div>
</div>
</body></html> |
2：在前端JS字符串转化成JSON格式是通过eval()进行；
<head> <title>jQuery 操作JSON 数据</title>
<script src="JScript/jquery-1.8.2.min.js"
type="text/javascript"></script>
<script type="text/javascript">
var
strInfo = "{‘name‘: ‘小明‘,‘sex‘: ‘男‘,‘email‘: ‘abc@126.com‘,‘date‘:1349340837359}";
$(function() {
var
strV0 = "原始数据";
var
strV1 = "变化数据";
var
strHTML = "";
//将字符串转成JSON对象
var
objInfo = eval(‘(‘
+ strInfo + ‘)‘);
//根据按钮文字改变JSON对象中的值
if
($(this).val() == strV1) {
objInfo.date = new
Date().getTime();
}
strHTML += "姓名："
+ objInfo.name + "<br>";
strHTML += "性别："
+ objInfo.sex + "<br>";
strHTML += "邮箱："
+ objInfo.email + "<br>";
strHTML += "时间："
+ objInfo.date + "<hr>";
//切换按钮显示的文字
if
($(this).val() == strV0) {
$(this).val(strV1);
} else
{
$(this).val(strV0);
}
//显示处理后的数据
$("#Tip").html(strHTML);
});
});
</script>
</head><body> <div class="iframe">
<div class="title">
<input id="Button1"
type="button"
class="btn"
value="原始数据"
/>
</div>
<div class="content">
<div id="Tip"></div>
</div>
</div>
</body></html> |
3：上面的Json格式都是比较简单类型（只是name:value类型），还有一种是带嵌套平时我们也会经常碰到；Json中是以"[]"来包含；我们可以通过each进行循环显示出来；
<head> <title>jQuery 遍历JSON 数据</title>
<script src="JScript/jquery-1.8.2.min.js"
type="text/javascript"></script>
<script type="text/javascript">
var
objData = {
member: [{
grade: "一年级",
students: {
name: ["刘小芳", "李大明"]
}
}, {
grade: "二年级",
students: {
name: ["陈优", "王小海", "朱红"]
}
}, {
grade: "三年级",
students: {
name: ["张妍", "蔡霞"]
}
}]
};
function add_Grade() {
var
objmember = objData.member;
var
strHTML_0 = "";
$.each(objmember, function(index) {
strHTML_0 += ‘<a href="javascript:" onclick="lnk_Click(‘
+ index + ‘)">‘
+ objmember[index].grade
+ ‘</a> ‘;
});
$(".title").html("年级优秀学生："
+ strHTML_0);
};
function lnk_Click(i) {
var
objstudent = objData.member[i].students.name;
var
strHTML_1 = "";
$.each(objstudent, function(index) {
strHTML_1 += ‘ ‘
+ objstudent[index] + ‘ ‘;
});
$("#Tip").html(strHTML_1);
};
$(function() {
add_Grade();
lnk_Click(0)
});
</script>
</head><body> <div class="iframe">
<div class="title"></div>
<div class="content">
<div id="Tip"></div>
</div>
</div>
</body></html> |
4：在ASP.NET中操作JSON一般是与ashx进行结合；后台返回JSON在前台进行显示；下面的实例通过AJAX获得后台对象实体的字符串然后显示；
a：前台页面通过ajax调用后台的ashx程序获得数据
<head runat="server">
<title></title>
<script src="Scripts/jquery-1.8.2.js"
type="text/javascript"></script>
<script type="text/javascript">
$(function () {
var
strHtml = "";
$("#BtnGetJson").click(function () {
$.ajax({
url: "ToJson.ashx",
type: "GET",
dataType: "json",
success: function (data) {
$.each(data, function (index) {
strHtml += ‘ ‘
+ data[index].Name + ‘ ‘
+ data[index].PassWord + ‘<br/>‘;
});
$("#MyDiv").html(strHtml);
}
});
});
});
</script>
</head><body> <form id="form1"
runat="server">
<input id="BtnGetJson"
type="button"
value="获得JSON值"
/>
<div id="MyDiv">
</div>
</form>
</body></html> |
b：新建一个ToJson.ashx的一般处理程序类，让它将后台的实体对象进行转化返回到前台
using
System;
using
System.Collections.Generic;
using
System.Linq;
using
System.Web;
namespace
JqueryForJson
{ /// <summary>
/// ToJson 的摘要说明
/// </summary>
public
class
ToJson : IHttpHandler
{
public
void
ProcessRequest(HttpContext context)
{
context.Response.ContentType = "text/plain";
List<User> list = new
List<User>();
list.Add(new
User() { Name = "踏浪帅", PassWord = "123456"
});
list.Add(new
User() { Name = "wujy", PassWord = "456789"
});
string
JsonStr = JsonHelper.GetJson<List<User>>(list);//如果是单个实体GetJson<User>(model)
context.Response.Write(JsonStr);
}
public
bool
IsReusable
{
get
{
return
false;
}
}
}
public
class
User
{
public
string
Name { get; set; }
public
string
PassWord { get; set; }
}
} |
c：这边有一个把实体转化成JSON字符串的类，当然也可以通过其它方式进行转化；
using
System;
using
System.Collections.Generic;
using
System.Linq;
using
System.Web;
using
System.Runtime.Serialization.Json;
using
System.ServiceModel.Web;///记得引用这个命名空间
using
System.IO;
using
System.Text;
/// <summary>/// Summary description for JsonHelper/// </summary>public
class
JsonHelper
{ public
JsonHelper()
{
//
// TODO: Add constructor logic here
//
}
/// <summary>
/// 把对象序列化 JSON 字符串
/// </summary>
/// <typeparam name="T">对象类型</typeparam>
/// <param name="obj">对象实体</param>
/// <returns>JSON字符串</returns>
public
static
string
GetJson<T>(T obj)
{
//记住 添加引用 System.ServiceModel.Web
/**
* 如果不添加上面的引用,System.Runtime.Serialization.Json; Json是出不来的哦
* */
DataContractJsonSerializer json = new
DataContractJsonSerializer(typeof(T));
using
(MemoryStream ms = new
MemoryStream())
{
json.WriteObject(ms, obj);
string
szJson = Encoding.UTF8.GetString(ms.ToArray());
return
szJson;
}
}
/// <summary>
/// 把JSON字符串还原为对象
/// </summary>
/// <typeparam name="T">对象类型</typeparam>
/// <param name="szJson">JSON字符串</param>
/// <returns>对象实体</returns>
public
static
T ParseFormJson<T>(string
szJson)
{
T obj = Activator.CreateInstance<T>();
using
(MemoryStream ms = new
MemoryStream(Encoding.UTF8.GetBytes(szJson)))
{
DataContractJsonSerializer dcj = new
DataContractJsonSerializer(typeof(T));
return
(T)dcj.ReadObject(ms);
}
}
} |
感谢您的阅读，坚持每天进步一点点，离成功就更新一步；希望文章对您有所帮助；