asp.net Ext grid 显示列表_实用技巧

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<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="gridShowTest.aspx.cs" Inherits="ExtPra.gridShowTest" %>
<!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 runat="server">
<title>显示gird</title>
<link rel="Stylesheet" type="text/css" href="ExtJS/resources/css/ext-all.css" />
<script type="text/javascript" src="ExtJS/adapter/ext/ext-base.js"></script>
<script type="text/javascript" src="ExtJS/ext-all.js"></script>
<script type="text/javascript" src="ExtJS/build/locale/ext-lang-zh_CN.js"></script>
</head>
<body>
<form id="form1" runat="server">
<div>
<script type="text/javascript">
function ready()
{
Ext.BLANK_IMAGE_URL="ExtJS/docs/resources/s.gif"; //空白图片设置为本地,否则按默认方式从官方网站下载(在联网环境下)
var url="myGridJson.aspx?Param=select";
var sm=new Ext.grid.CheckboxSelectionModel();//复选按钮
var cm=new Ext.grid.ColumnModel //列模版定义(该例中定义显示数据库表Employees中的四列)
([
sm,//在每行的第一列添加一个复选按钮 ,
new Ext.grid.RowNumberer({header:"自动显示行号",width:100}),//添加自动显示行号的列
{header:'员工编号',dataIndex:'EmployeeID',sortable:true, width:100},
{header:'名字',dataIndex:'LastName',sortable:true,width:100,editor:new Ext.form.TextField()},
{header:'姓氏',dataIndex:'FirstName',sortable:true,width:100,editor:new Ext.form.TextField()},
{header:'出生日期',dataIndex:'BirthDate',sortable:true,width:100,renderer:Ext.util.Format.dateRenderer('Y年m月d日')} //,renderer:Ext.util.Format.dateRenderer('Y年m月d日')
]);
// cm.defaultSortable=true; //设置所有列是可以排序的
var fields= //字段
[
{name:"EmployeeID",mapping: 'EmployeeID'},
{name:"LastName",mapping: 'LastName'},
{name:"FirstName",mapping:'FirstName'},
{name:"BirthDate",mapping:'BirthDate',type:'date'}
];
//store 是Ext中数据存储的和数据交换的缓冲区 在grid等控件中要使用store作为填充的数据源
var store=new Ext.data.Store //JsonReader支持分页 totalProperty获得记录的总数 ,root是从服务器返回的json串
({
proxy:new Ext.data.HttpProxy({url:url}),//proxy告诉我们从哪里获取数据
reader:new Ext.data.JsonReader //reader 告诉我们如何解析数据
({
totalProperty:"totalCount",root:"root",//totalCount
fields:fields //fields 告诉我们按照定义的规范进行解析 每行读取4个数据,第一个是EmployeeID 第二个是LastName ...
}) //与ColumnModel中的dataIndex想对应,这样ColumnModel就知道那列应该显示那条数据了
// remoteSort:true //支持服务器端排序 设置 store.remoteSort = true ,会向后台提交两个参数 sort ,dir,sort排序字段 dir升序或降序
}); //此时不支持前台排序,否则只是前台排序
store.load({params:{start:0,limit:3}}); //对数据进行初始化 start表示起始页 limit表示每页大小,最好与分页toolbar中的pageSize一致
var pagingBar=new Ext.PagingToolbar //分页toolbar
({
displayInfo:true,
emptyMsg:"没有数据显示",
displayMsg:"显示从{0}条数据到{1}条数据,共{2}条数据",
store:store,
pageSize:3 //客户端的模拟分页 可以再分页栏中看到根据该pageSize和总记录数(pageCount)计算得到的页数 pageCount/pageSize
});
var grid=new Ext.grid.GridPanel
({
// el:"testGrid",
id:"MenuGrid",
title:"显示列表",
// autoWidth:true,
autoHeight:true,
width:550,
//height:300, //千万别忘了设置height,否则默认的height的值是0,显示不了读取的数据
renderTo:document.body,
layout:"fit",
frame:true,
border:true,
// autoScroll:true,
sm:sm, //GridPanel中的复选按钮,可以全选所有的行,若没有设置该属性,则GridPanel得全选功能不能实现
cm:cm,
store:store,
// viewConfig:{forceFit: true},设置该属性为true则grid中的列宽设置无效,grid会根据这些数值计算出比例,对各列分配宽度
bbar:pagingBar
});
grid.addListener('sortchange', sortchangeFn); //给grid增加一个'sortchange'事件,当发生排序改变的事件,启动服务器端排序(即remoteSort:true)
//和重新加载数据( 即store.reload({params:{start:0,limit:3}}) )
function sortchangeFn(grid, sortinfo)
{
//alert('排序'+ sortinfo.field + "方向" + sortinfo.direction);
remoteSort:true
store.reload({params:{start:0,limit:3}}); //每次store.reload的时候,向后台传递sort ,dir dir每点击一次就会自动做相应的改变从desc->asc,asc->desc
}
}
Ext.onReady(ready);
</script>
<div id="testGrid">
</div>
</div>
</form>
</body>
</html>

后台代码:

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Data.SqlClient;
using System.Collections.Generic;
using Newtonsoft.Json;
namespace ExtPra
{
public partial class myGridJson : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
#region 分页
int pagesize = 20;
int start = 1;
string field, asc_desc;
if (string.IsNullOrEmpty(Request["sort"]))
{
field = "EmployeeID";
asc_desc = "asc";
}
else
{
field = Request["sort"];
asc_desc = Request["dir"];
}
if (!string.IsNullOrEmpty(Request["limit"]))
{
pagesize = int.Parse(Request["limit"]);
start = int.Parse(Request["start"]);
}
start = start / pagesize;
start += 1;
#endregion
string strSql = string.Format("select EmployeeID, LastName,FirstName,BirthDate from Employees where EmployeeID between ({0}-1)*{1}+1 and {0}*{1} order by {2} {3} ",start,pagesize,field,asc_desc);
string strConnection = "Data Source=.;Initial Catalog=Northwind;User ID=sa;password=sa";
SqlConnection con = new SqlConnection(strConnection);
SqlDataAdapter da = new SqlDataAdapter(strSql, con);
DataSet ds = new DataSet();
da.Fill(ds, "Employees");
string json = "";
IList<Hashtable> mList = new List<Hashtable>();
try
{
foreach (DataRow row in ds.Tables[0].Rows)
{
Hashtable ht = new Hashtable();
foreach (DataColumn col in ds.Tables[0].Columns)
{
ht.Add(col.ColumnName, row[col.ColumnName]);
}
mList.Add(ht);
}
json = JavaScriptConvert.SerializeObject(mList);
}
catch (Exception ee)
{
string error = ee.Message;
}
// int count = ds.Tables[0].Rows.Count;
int count = 9;
json = "{totalCount:" + count + ",root:" + json + "}";
Response.Write(json);
Response.End();
}
}
}
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