当前位置: 首页 > 图文教程 > 网络编程 > ASP.NET > asp.net下 jquery jason 高效传输数据

ASP.NET
通过数据捆绑将数据添加到ASP.NET 页面
ASP.NET 2.0程序安全的基础知识
ASP.NET2.0的跨页回调
使用ASP.Net Forms模式实现WebService身份验证
asp.net 2.0中不同web控件之间的相互调用
如何于DataGridView控件中以跨数据行方式显示数据
图片地址防盗链,通过IHttpHandler实现
ACCESS在Web.config里设置连接字符串
asp.net 2.0 下的表单验证Cookieless属性
结合ASP.NET与JavaScript开发电子沙盘
理解ASP.NET与客户端缓存之HTTP协议
数据回发时，维护ASP.NET Tree控件位置
获得DataGridViewCheckBoxColumn的状态
GridView显示主细表并添加打开、关闭功能
ASP.NET 2.0防止同一用户同时登陆
asp.net中对数据库表插入null空值的问题
IIS运行不了ASP.NET的解决办法
ASP.NET实现投票结果的图片进度条显示
实例：asp.net生成曲线图的过程
ASP.NET2.0中TextBox的两个有趣的属性

No. « 157 158 159 160 »

技术文章搜索

关键字

ASP.NET 中的 asp.net下 jquery jason 高效传输数据

出处:互联网   整理: 软晨网（RuanChen.com）   发布: 2009-10-11   浏览: 124 ::
收藏到网摘: n/a

jquery jason 高效传输数据转自网上稍有修改 Default.html
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>test2</title>
<script src="/upload/tech/20091011/20091011144047_fae0b27c451c728867a567e8c1bb4e53.js" type="text/javascript"></script>
<script src="/upload/tech/20091011/20091011144048_443cb001c138b2561a0d90720d6ce111.js" type="text/javascript"></script>
<script src="/upload/tech/20091011/20091011144049_d81f9c1be2e08964bf9f24b15f0e4900.js" type="text/javascript"></script>
</head>
<body>
<div>
<div>
<br />
<input id="first" type="button" value=" << " /><input id="previous" type="button"
value=" < " /><input id="next" type="button" value=" > " /><input id="last" type="button"
value=" >> " />
<span id="pageinfo"></span>
<ul id="datas">
<li id="template">
<span id="OrderID">
订单ID
</span>/
<span id="CustomerID">
客户ID
</span>
<span id="EmployeeID">
雇员ID
</span>/
<span id="OrderDate">
订购日期
</span>/
<span id="ShippedDate">
发货日期
</span>/
<span id="ShippedName">
货主名称
</span>/
<span id="ShippedAddress">
货主地址
</span>/
<span id="ShippedCity">
货主城市
</span>/
<span id="more">
更多信息
</span>
</li>
</ul>
</div>
<div id="load" style="left: 0px; position: absolute; top: 0px; background-color: red">
LOADING....
</div>
<input type="hidden" id="pagecount" />
</div>
</body>
</html>
Handler.ashx
<%@ WebHandler Language="C#" Class="jQueryJSON.Handler" %>
using System;
using System.Data;
using System.Web;
using System.Collections;
using System.Web.Services;
using System.Web.Services.Protocols;
using System.Configuration;
using System.Data.SqlClient;
using System.Text;
using System.Xml;
using NetServ.Net.Json;
namespace jQueryJSON
{
/// <summary>
/// $codebehindclassname$ 的摘要说明
/// </summary>
[WebService(Namespace = "http://tempuri.org/json/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
public class Handler : IHttpHandler
{
string dbfile = ConfigurationManager.AppSettings["conn"].ToString();
readonly int PageSize = int.Parse(ConfigurationManager.AppSettings["PageSize"]);
public void ProcessRequest(HttpContext context)
{
context.Response.ContentType = "text/plain";
//不让浏览器缓存
context.Response.Buffer = true;
context.Response.ExpiresAbsolute = DateTime.Now.AddDays(-1);
context.Response.AddHeader("pragma", "no-cache");
context.Response.AddHeader("cache-control", "");
context.Response.CacheControl = "no-cache";
string result = "";
if (context.Request.Params["getPageCount"] != null) result = GetPageCount();
if (context.Request.Params["pageIndex"] != null)
{
string pageindex = context.Request.Params["pageIndex"];
//if (context.Cache.Get(pageindex) != null)
// result = context.Cache.Get(pageindex).ToString();
//else
//{
// result = GetPageData(context.Request.Params["pageIndex"]);
// context.Cache.Add(
// pageindex,
// result,
// null,
// DateTime.Now.AddMinutes(1),
// System.Web.Caching.Cache.NoSlidingExpiration,
// System.Web.Caching.CacheItemPriority.Default,
// null);
//}
result = GetPageData(context.Request.Params["pageIndex"]);
}
context.Response.Write(result);
}
private string GetPageData(string p)
{
int PageIndex = int.Parse(p);
string sql;
if (PageIndex == 1)
sql = "select top " + PageSize.ToString() + " * from Orders order by OrderID desc";
else
sql = "select top " + PageSize.ToString() + " * from Orders where OrderID not in(select top " + ((PageIndex - 1) * PageSize).ToString() + " OrderID from Orders order by OrderID desc) order by OrderID desc";
SqlConnection conn = new SqlConnection(dbfile);
SqlDataAdapter da = new SqlDataAdapter(sql, conn);
DataTable dt = new DataTable("table");
da.Fill(dt);
return DataTableJson(dt);
}
private string GetPageCount()
{
SqlConnection conn = new SqlConnection(dbfile);
SqlCommand cmd = new SqlCommand("select count(*) from Orders", conn);
conn.Open();
int rowcount = Convert.ToInt32(cmd.ExecuteScalar());
conn.Close();
return ((rowcount + PageSize - 1) / PageSize).ToString();
}
private string DataTable2Json(DataTable dt)
{
StringBuilder jsonBuilder = new StringBuilder();
jsonBuilder.Append("{\"");
jsonBuilder.Append(dt.TableName);
jsonBuilder.Append("\":[");
for (int i = 0; i < dt.Rows.Count; i++)
{
jsonBuilder.Append("{");
for (int j = 0; j < dt.Columns.Count; j++)
{
jsonBuilder.Append("\"");
jsonBuilder.Append(dt.Columns[j].ColumnName);
jsonBuilder.Append("\":\"");
jsonBuilder.Append(dt.Rows[i][j].ToString());
jsonBuilder.Append("\",");
}
jsonBuilder.Remove(jsonBuilder.Length - 1, 1);
jsonBuilder.Append("},");
}
jsonBuilder.Remove(jsonBuilder.Length - 1, 1);
jsonBuilder.Append("]");
jsonBuilder.Append("}");
return jsonBuilder.ToString();
}
private string DataTableJson(DataTable dt)
{
JsonWriter writer = new JsonWriter();
JsonObject content = new JsonObject();
JsonArray Orders = new JsonArray();
JsonObject Order;
JsonObject OrderItem = new JsonObject();
for (int i = 0; i < dt.Rows.Count; i++)
{
Order = new JsonObject();
for(int j =0;j<dt.Columns.Count;j++)
{
Order.Add(dt.Columns[j].ColumnName, dt.Rows[i][j].ToString());
}
Orders.Add(Order);
}
content.Add(dt.TableName, Orders);
content.Write(writer);
writer = new IndentedJsonWriter();
content.Write(writer);
return writer.ToString();
}
public bool IsReusable
{
get
{
return false;
}
}
}
}
ajaxfn.js
//AJAX方法取得数据并显示到页面上
function bind()
{
$("[@id=ready]").remove();
$("#load").show();
$.ajax({
type: "get",//使用get方法访问后台
dataType: "json",//返回json格式的数据
url: "Handler.ashx",//要访问的后台地址
data: "pageIndex=" + pageIndex,//要发送的数据
complete :function(){$("#load").hide();},//AJAX请求完成时隐藏loading提示
success: function(msg){//msg为返回的数据，在这里做数据绑定
var data = msg.table;
$.each(data, function(i, n){
var row = $("#template").clone();
row.find("#OrderID").text(n.OrderID);
row.find("#CustomerID").text(n.CustomerID);
row.find("#EmployeeID").text(n.EmployeeID);
row.find("#OrderDate").text(ChangeDate(n.OrderDate));
if(n.RequiredDate !== undefined) row.find("#ShippedDate").text(ChangeDate(n.RequiredDate));
row.find("#ShippedName").text(n.ShipName);
row.find("#ShippedAddress").text(n.ShipAddress);
row.find("#ShippedCity").text(n.ShipCity);
row.find("#more").html("<a href=OrderInfo.aspx?id=" + n.OrderID + "&pageindex="+pageIndex+"> More</a>");
row.attr("id","ready");//改变绑定好数据的行的id
row.appendTo("#datas");//添加到模板的容器中
});
$("[@id=ready]").show();
SetPageInfo();
}
});
}
function ChangeDate(date)
{
return date.replace("-","/").replace("-","/");
}
//设置第几页/共几页的信息
function SetPageInfo()
{
$("#pageinfo").html(pageIndex + "/" + pageCount);
}
//AJAX方法取得分页总数
function GetPageCount()
{
$.ajax({
type: "get",
dataType: "text",
url: "Handler.ashx",
data: "getPageCount=1",
async: false,
success: function(msg){
$("#pagecount").val(msg);
}
});
}
//改变翻页按钮状态
function ChangeState(state1,state2)
{
if(state1 == 1)
{
document.getElementById("first").disabled = "";
document.getElementById("previous").disabled = "";
}
else if(state1 == 0)
{
document.getElementById("first").disabled = "disabled";
document.getElementById("previous").disabled = "disabled";
}
if(state2 == 1)
{
document.getElementById("next").disabled = "";
document.getElementById("last").disabled = "";
}
else if(state2 == 0)
{
document.getElementById("next").disabled = "disabled";
document.getElementById("last").disabled = "disabled";
}
}
Gonneng.js
var pageIndex = 1
var pageCount = 0;
$(function(){
GetPageCount();//取得分页总数
pageCount = parseInt($("#pagecount").val());//分页总数放到变量pageCount里
$("#load").hide();//隐藏loading提示
$("#template").hide();//隐藏模板
ChangeState(0,1);//设置翻页按钮的初始状态
bind();//绑定第一页的数据
//第一页按钮click事件
$("#first").click(function(){
pageIndex = 1;
ChangeState(0,1);
bind();
});
//上一页按钮click事件
$("#previous").click(function(){
pageIndex -= 1;
ChangeState(-1,1);
if(pageIndex <= 1)
{
pageIndex = 1;
ChangeState(0,-1);
}
bind();
});
//下一页按钮click事件
$("#next").click(function(){
pageIndex += 1;
ChangeState(1,-1);
if(pageIndex>=pageCount)
{
pageIndex = pageCount;
ChangeState(-1,0);
}
bind(pageIndex);
});
//最后一页按钮click事件
$("#last").click(function(){
pageIndex = pageCount;
ChangeState(1,0);
bind(pageIndex);
});
});
还需要jquery-1.2.6.js 网上很多
web.config 中添加
<appSettings>
<add key="conn" value="Server=.;database=Northwind;uid=sa;pwd=sa"/>
<add key="PageSize" value="10"/>
</appSettings>