對於問題從后台獲取json數據，將內容填充到下拉列表，代碼非常簡單，具體過程請看下面代碼。
需求：url:鏈接 par：ID sel：下拉列表選擇器
function
BuildSelectBox(url, par, sel) {
$(sel).empty();
$.getJSON(url, { id: par },
function
(json, textStatus) {
for
(
var
i = json.length - 1; i >= 0; i--) {
$(sel).prepend(
'<option value="'
+ json[i].Id +
'">'
+ json[i].Name +
'</option>'
)
};
$(sel).prepend(
'<option value="0">請選擇</option>'
)
});
}
以上代碼很簡單吧，此問題很easy的解決了。
Jquery 使用Ajax獲取后台返回的Json數據頁面處理過程
具體實現過程請看下面代碼示例：
<!DOCTYPE html PUBLIC
"-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"
>
<head>
<title></title>
<script src=
"JS/jquery-1.8.0.min.js"
type=
"text/javascript"
></script>
<script type=
"text/javascript"
>
$(
function
() {
$.ajax({
url:
'jsondata.ashx'
,
type:
'GET'
,
dataType:
'json'
,
timeout: 1000,
cache:
false
,
beforeSend: LoadFunction,
//加載執行方法
error: erryFunction,
//錯誤執行方法
success: succFunction
//成功執行方法
})
function
LoadFunction() {
$(
"#list"
).html(
'加載中...'
);
}
function
erryFunction() {
alert(
"error"
);
}
function
succFunction(tt) {
$(
"#list"
).html(
''
);
//eval將字符串轉成對象數組
//var json = { "id": "10086", "uname": "zhangsan", "email": "zhangsan@qq.com" };
//json = eval(json);
//alert("===json:id=" + json.id + ",uname=" + json.uname + ",email=" + json.email);
var
json = eval(tt);
//數組
$.each(json,
function
(index, item) {
//循環獲取數據
var
name = json[index].Name;
var
idnumber = json[index].IdNumber;
var
sex = json[index].Sex;
$(
"#list"
).html($(
"#list"
).html() +
"<br>"
+ name +
" - "
+ idnumber +
" - "
+ sex +
"<br/>"
);
});
}
});
</script>
</head>
<body>
<ul id=
"list"
>
</ul>
</body>
</html>
<%@ WebHandler Language=
"C#"
Class=
"jsondata"
%>
using System;
using System.Web;
using System.Web.Script.Serialization;
using System.IO;
using System.Text;
using System.Collections.Generic;
using Newtonsoft.Json;
using System.Data;
public class jsondata : IHttpHandler {
public void ProcessRequest(HttpContext context)
{
context.Response.ContentType =
"text/plain"
;
string JsonStr = JsonConvert.SerializeObject(CreateDT());
context.Response.Write(JsonStr);
context.Response.End();
}
#region 創建測試數據源
//創建DataTable
protected DataTable CreateDT()
{
DataTable tblDatas =
new
DataTable(
"Datas"
);
//序號列
//tblDatas.Columns.Add("ID", Type.GetType("System.Int32"));
//tblDatas.Columns[0].AutoIncrement = true;
//tblDatas.Columns[0].AutoIncrementSeed = 1;
//tblDatas.Columns[0].AutoIncrementStep = 1;
//數據列
tblDatas.Columns.Add(
"IdNumber"
, Type.GetType(
"System.String"
));
tblDatas.Columns.Add(
"Name"
, Type.GetType(
"System.String"
));
tblDatas.Columns.Add(
"BirthDate"
, Type.GetType(
"System.String"
));
tblDatas.Columns.Add(
"Sex"
, Type.GetType(
"System.String"
));
tblDatas.Columns.Add(
"Wage"
, Type.GetType(
"System.Decimal"
));
tblDatas.Columns.Add(
"Bonus"
, Type.GetType(
"System.Decimal"
));
//統計列開始
tblDatas.Columns.Add(
"NeedPay"
, Type.GetType(
"System.String"
),
"Wage+Bonus"
);
//統計列結束
tblDatas.Columns.Add(
"Address"
, Type.GetType(
"System.String"
));
tblDatas.Columns.Add(
"PostCode"
, Type.GetType(
"System.String"
));
//設置身份證號碼為主鍵
tblDatas.PrimaryKey =
new
DataColumn[] { tblDatas.Columns[
"IdNumber"
] };
tblDatas.Rows.Add(
new
object[] {
"43100000000000"
,
"張三"
,
"1982"
,
"0"
, 3000, 1000,
null
,
"深圳市"
,
"518000"
});
tblDatas.Rows.Add(
new
object[] {
"43100000000001"
,
"李四"
,
"1983"
,
"1"
, 3500, 1200,
null
,
"深圳市"
,
"518000"
});
tblDatas.Rows.Add(
new
object[] {
"43100000000002"
,
"王五"
,
"1984"
,
"1"
, 4000, 1300,
null
,
"深圳市"
,
"518000"
});
tblDatas.Rows.Add(
new
object[] {
"43100000000003"
,
"趙六"
,
"1985"
,
"0"
, 5000, 1400,
null
,
"深圳市"
,
"518000"
});
tblDatas.Rows.Add(
new
object[] {
"43100000000004"
,
"牛七"
,
"1986"
,
"1"
, 6000, 1500,
null
,
"深圳市"
,
"518000"
});
return
tblDatas;
}
#endregion
public bool IsReusable
{
get
{
return
false
;
}
}
}
<!--
<script type=
"text/javascript"
>
$(
function
() {
$.ajax({
url:
'jsondata.ashx'
,
type:
'GET'
,
dataType:
'json'
,
timeout: 1000,
cache:
false
,
beforeSend: LoadFunction,
//加載執行方法
error: erryFunction,
//錯誤執行方法
success: succFunction
//成功執行方法
})
function
LoadFunction() {
$(
"#list"
).html(
'加載中...'
);
}
function
erryFunction() {
alert(
"error"
);
}
function
succFunction(tt) {
$(
"#list"
).html(
''
);
//eval將字符串轉成對象數組
//var json = { "id": "10086", "uname": "zhangsan", "email": "zhangsan@qq.com" };
//json = eval(json);
//alert("===json:id=" + json.id + ",uname=" + json.uname + ",email=" + json.email);
var
json = eval(tt);
//數組
$.each(json,
function
(index, item) {
//循環獲取數據
var
Key = json[index].key;
var
Info = json[index].info;
// var idnumber = json[index].IdNumber;
// var sex = json[index].Sex;
$(
"#list"
).html($(
"#list"
).html() +
"<br>"
+ Key +
"----"
+ Info.name);
//+ " - " + idnumber + " - " + sex + "<br/>");
});
}
});
</script>
-->
<%@ WebHandler Language=
"C#"
Class=
"jsondata"
%>
using System;
using System.Web;
using System.Web.Script.Serialization;
using System.IO;
using System.Text;
using System.Collections;
using System.Collections.Generic;
using System.Data;
public class jsondata : IHttpHandler {
public void ProcessRequest(HttpContext context)
{
context.Response.ContentType =
"text/plain"
;
context.Response.Cache.SetNoStore();
string data =
"[{\"key\":\"1\",\"info\":{\"name\":\"222\",\"age\":\"333\",\"sex\":\"444\"}},{\"key\":\"2\",\"info\":{\"name\":\"999\",\"age\":\"000\",\"sex\":\"111\"}}]"
;
context.Response.Write(
new
JavaScriptSerializer().Serialize(data));
}
public bool IsReusable
{
get
{
return
false
;
}
}
}
<%@ Page Language=
"C#"
AutoEventWireup=
"true"
CodeFile=
"Test2013.aspx.cs"
Inherits=
"Test2013"
%>
<!DOCTYPE html PUBLIC
"-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"
>
<head runat=
"server"
>
<title></title>
<script src=
"JS/jquery-1.8.0.min.js"
type=
"text/javascript"
></script>
<script type=
"text/javascript"
>
function
GetPara(o) {
var
sortid = $(o).val();
$.ajax({
url:
'GetPara.ashx?type=get&sortid='
+ sortid,
type:
'GET'
,
dataType:
'json'
,
timeout: 3000,
cache:
false
,
beforeSend: LoadFunction,
//加載執行方法
error: erryFunction,
//錯誤執行方法
success: succFunction
//成功執行方法
})
function
LoadFunction() {
$(
"#list"
).html(
'加載中...'
);
}
function
erryFunction() {
alert(
"error"
);
}
function
succFunction(tt) {
$(
"#list"
).html(
''
);
var
json = eval(tt);
//數組
$.each(json,
function
(index, item) {
//循環獲取數據
var
Id = json[index].id;
var
Name = json[index].name;
$(
"#list"
).html($(
"#list"
).html() +
"<br>"
+ Name +
"<input type='text' id='"
+ Id +
"' /><br/>"
);
});
}
};
function
SavePara() {
var
parameter = {};
$(
"#list input:text"
).each(
function
() {
var
key = $(
this
).attr(
"id"
);
var
value = $(
this
).val();
parameter[key] = value;
});
$.ajax({
url:
'GetPara.ashx?type=save'
,
type:
'POST'
,
dataType:
'json'
,
data: parameter,
timeout: 3000,
cache:
false
,
beforeSend: LoadFunction,
//加載執行方法
error: erryFunction,
//錯誤執行方法
success: succFunction
//成功執行方法
})
function
LoadFunction() {
}
function
erryFunction() {
}
function
succFunction(tt) {
}
};
</script>
</head>
<body>
<form id=
"form1"
runat=
"server"
>
<div>
<asp:DropDownList ID=
"ddl1"
runat=
"server"
onchange=
"GetPara(this)"
>
</asp:DropDownList>
<ul id=
"list"
></ul>
<input type=
"button"
value=
"保存數據"
onclick=
"SavePara()"
/>
</div>
</form>
</body>
</html>
<%@ WebHandler Language=
"C#"
Class=
"GetPara"
%>
using System;
using System.Web;
using System.Data;
using System.Collections.Generic;
using System.Web.Script.Serialization;
public class GetPara : IHttpHandler {
public void ProcessRequest (HttpContext context) {
context.Response.ContentType =
"text/plain"
;
string SortId = context.Request[
"sortid"
];
string Type = context.Request[
"type"
];
if
(Type==
"get"
)
{
if
(!string.IsNullOrEmpty(SortId))
{
DataTable dt = MSCL.SqlHelper.GetDataTable(
"select * from PR_PRODUCTPARAS where sortid='"
+ SortId +
"' "
);
List<Paras> list =
new
List<Paras>();
for
(int i = 0; i < dt.Rows.Count; i++)
{
Paras a =
new
Paras();
a.id = dt.Rows[i][
"PARAID"
].ToString();
a.name = dt.Rows[i][
"PARANAME"
].ToString();
list.Add(a);
}
context.Response.Write(
new
JavaScriptSerializer().Serialize(list));
}
}
else
if
(Type ==
"save"
)
{
//反序列化json
System.IO.Stream stream = context.Request.InputStream;
System.IO.StreamReader sr =
new
System.IO.StreamReader(stream, System.Text.Encoding.GetEncoding(
"UTF-8"
));
string sJson = sr.ReadToEnd();
if
(sJson.Contains(
"&"
))
{
string[] sArr = sJson.Split(
'&'
);
for
(int i = 0; i < sArr.Length; i++)
{
string[] sArr1 = sArr[i].Split(
'='
);
object id = sArr1[0];
object value = sArr1[1];
}
}
}
else
{ }
}
public bool IsReusable {
get {
return
false
;
}
}
public struct Paras
{
public string id;
public string name;
}
}