这一节，将学习如何使用网络上最常见的UI控件_Grid
1.静态示例:
静态示例其实官方下载包里，就有sample，这里只贴出代码，后面的如何跟WCF结合，做出动态版的Grid才是本文重点
<!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> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <link rel="stylesheet" type="text/css" href="../resources/css/ext-all.css" /> <script type="text/javascript" src="../adapter/ext/ext-base.js"></script> <script type="text/javascript" src="../ext-all.js"></script> <title>ExtJs Study</title></head><body>
<script type="text/javascript">
Ext.onReady(function() {
Ext.onReady(
Ext.state.Manager.setProvider(new Ext.state.CookieProvider());//设置缓存 //数据来源，实际应用用可动态读取 var myData = [ ['3m Co', 71.72, 0.02, 0.03, '9/1 12:00am'], ['Alcoa Inc', 29.01, 0.42, 1.47, '9/1 12:00am'], ['Altria Group Inc', 83.81, 0.28, 0.34, '9/1 12:00am'], ['American Express Company', 52.55, 0.01, 0.02, '9/1 12:00am'], ['American International Group, Inc.', 64.13, 0.31, 0.49, '9/1 12:00am'], ['AT&T Inc.', 31.61, -0.48, -1.54, '9/1 12:00am'], ['Boeing Co.', 75.43, 0.53, 0.71, '9/1 12:00am'], ['Caterpillar Inc.', 67.27, 0.92, 1.39, '9/1 12:00am'], ['Citigroup, Inc.', 49.37, 0.02, 0.04, '9/1 12:00am'], ['E.I. du Pont de Nemours and Company', 40.48, 0.51, 1.28, '9/1 12:00am'], ['Exxon Mobil Corp', 68.1, -0.43, -0.64, '9/1 12:00am'], ['General Electric Company', 34.14, -0.08, -0.23, '9/2 12:00am'], ['General Motors Corporation', 30.27, 1.09, 3.74, '9/3 12:00am'], ['Hewlett-Packard Co.', 36.53, -0.03, -0.08, '9/1 12:00am'], ['Honeywell Intl Inc', 38.77, 0.05, 0.13, '9/1 12:00am'], ['Intel Corporation', 19.88, 0.31, 1.58, '9/1 12:00am'], ['International Business Machines', 81.41, 0.44, 0.54, '9/1 12:00am'], ['Johnson & Johnson', 64.72, 0.06, 0.09, '9/1 12:00am'], ['JP Morgan & Chase & Co', 45.73, 0.07, 0.15, '9/1 12:00am'], ['McDonald\'s Corporation', 36.76, 0.86, 2.40, '9/1 12:00am'], ['Merck & Co., Inc.', 40.96, 0.41, 1.01, '9/1 12:00am'], ['Microsoft Corporation', 25.84, 0.14, 0.54, '9/1 12:00am'], ['Pfizer Inc', 27.96, 0.4, 1.45, '9/1 12:00am'], ['The Coca-Cola Company', 45.07, 0.26, 0.58, '9/1 12:00am'], ['The Home Depot, Inc.', 34.64, 0.35, 1.02, '9/1 12:00am'], ['The Procter & Gamble Company', 61.91, 0.01, 0.02, '9/1 12:00am'], ['United Technologies Corporation', 63.26, 0.55, 0.88, '9/1 12:00am'], ['Verizon Communications', 35.57, 0.39, 1.11, '9/1 12:00am'], ['Wal-Mart Stores, Inc.', 45.45, 0.73, 1.63, '9/1 12:00am'] ]; //"变化"字段的格式化输出 function change(val) { if (val > 0) { return '<span style="color:green;">' + val + '</span>'; } else if (val < 0) { return '<span style="color:red;">' + val + '</span>';
} return val; } //"变化(%)"字段的格式化输出 function pctChange(val) { if (val > 0) { return '<span style="color:green;">' + val + '%</span>'; } else if (val < 0) { return '<span style="color:red;">' + val + '%</span>'; } return val; } //创建数据存储(类似c#中的dataset构架) var store = new Ext.data.SimpleStore({ fields: [ { name: 'company' }, { name: 'price', type: 'float' }, { name: 'change', type: 'float' }, { name: 'pctChange', type: 'float' }, { name: 'lastChange', type: 'date', dateFormat: 'n/j h:ia' } ] }); store.loadData(myData);//加载数据 //创建数据表格 var grid = new Ext.grid.GridPanel({ store: store, columns: [ { id: 'company', header: "公司名", 160, sortable: true, dataIndex: 'company' }, { header: "价格", 75, sortable: true, renderer: 'usMoney', dataIndex: 'price' }, { header: "变化", 75, sortable: true, renderer: change, dataIndex: 'change' }, { header: "变化(%)", 75, sortable: true, renderer: pctChange, dataIndex: 'pctChange' }, { header: "最后更新", 85, sortable: true, renderer: Ext.util.Format.dateRenderer('m/d/Y'), dataIndex: 'lastChange' } ], stripeRows: true, autoExpandColumn: 'company', height: 350, 600, title: '简单网络示例' }); grid.render('grid-example');//宣染指定ID grid.getSelectionModel().selectFirstRow();//默认选择第一行 
});</script><button id="btnHello">Hello World</button><div id="grid-example"></div></body></html>2.动态示例
先贴出运行效果图
a.先写wcf服务端
(1)新建一个"启用了Ajax的WCF服务",命名为MyService.svc
(2)写一个方法用于取得网格所需的数据
[AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)]
public class MyService
{
[OperationContract]
[WebInvoke(ResponseFormat = WebMessageFormat.Json, Method = "GET", UriTemplate = "GetClsData")]
public T_Class[] GetClsData()
{
List<T_Class> _Result = new List<T_Class>();
using (DBDataContext db = new DBDataContext())
{
var query = db.T_Classes.Where(c => c.F_Type.ToLower() == "shop").OrderBy(c => c.F_RootID).ThenBy(c => c.F_Orders).Select(c => new { F_ID = c.F_ID,
F_ClassName = c.F_ClassName, F_ParentID = c.F_ParentID,F_Orders = c.F_Orders,F_ReadMe = c.F_ReadMe });
_Result = db.ExecuteQuery<T_Class>(query, true).ToList<T_Class>();
db.Connection.Close();
}
return _Result.ToArray();
}
}
注意：这里是用linq to sql的方法写的，默认情况下linq to sql设计器生成的T_Class类里，是不支持序列化的，ExtJs调用时无法正确序列成JSON字符串，需要手动在类前加上数据契约
[DataContract]，在属性前加上[DataMember]
如下:
[Table(Name="dbo.T_Class")]
[DataContract]
public partial class T_Class : INotifyPropertyChanging, INotifyPropertyChanged
{
...
[Column(Storage="_F_ClassName", DbType="NVarChar(256)")]
[DataMember]
public string F_ClassName
{
...
(3)修改svc文件，右击svc文件，选择打开方式-->HTML编辑器，增加Factory="System.ServiceModel.Activation.WebServiceHostFactory"
即
<%@ ServiceHost Language="C#" Debug="true" Service="Ajax_WCF.MyService" CodeBehind="MyService.svc.cs" Factory="System.ServiceModel.Activation.WebServiceHostFactory"%>
(4)修改web.config,找到以下节点(注:Ajax_WCF为项目的命名空间，因各自项目实际情况而异)
<behavior name="Ajax_WCF.MyServiceAspNetAjaxBehavior">
<enableWebScript />
</behavior>
把<enableWebScript />删除，换成<webHttp />
即
<behavior name="Ajax_WCF.MyServiceAspNetAjaxBehavior">
<webHttp />
</behavior>
说明一下:(3),(4)二步是必须的，目的是为了生成Restful WCF，可以在ExtJs里用类似"MyService.svc/GetClsData"这样的url来访问
b.Extjs调用的前端页面
<!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>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<link rel="stylesheet" type="text/css" href="js/ext2.2/resources/css/ext-all.css" />
<script type="text/javascript" src="js/ext2.2/adapter/ext/ext-base.js"></script>
<script type="text/javascript" src="js/ext2.2/ext-all.js"></script>
<title>ExtJs Basic Grid Demo</title>
</head>
<body>
<script type="text/javascript">
Ext.onReady(function() {
var proxy = new Ext.data.HttpProxy({ url: 'MyService.svc/GetClsData' });
var reader = new Ext.data.JsonReader({}, [
{ name: 'F_ID' },
{ name: 'F_ClassName' },
{ name: 'F_Orders' },
{ name: 'F_ParentID' },
{ name: 'F_ReadMe'}]
)
var store = new Ext.data.Store({ proxy: proxy, reader: reader });
store.load();
var grid = new Ext.grid.GridPanel({
store: store,
columns: [
{ id: 'F_ID', header: "分类ID", 250, sortable: true, dataIndex: 'F_ID' },
{ header: "分类名称", 75, sortable: true, dataIndex: 'F_ClassName' },
{ header: "排序号", 75, sortable: true, dataIndex: 'F_Orders' },
{ header: "备注", 100, sortable: true, dataIndex: 'F_ReadMe'}],
height: 350,
600,
title: '基本网格示例',
viewConfig: { columnsText: '显示列', sortAscText: '升序', sortDescText: '降序' }
});
grid.render('grid-example');
grid.getSelectionModel().selectFirstRow();
});
</script>
ExtJs_Grid_Demo
<div id="grid-example"></div>
</body>
</html>
ok,完成了。
另外，如果要实现对Grid的查询，可以再加上这几行代码：
JS部分:
var fnAjaxDemo = function() {
var mydata;
Ext.Ajax.request({
url: "MyService.svc/GetClsData?name=" + encodeURIComponent(Ext.get("ProductName").dom.value), //服务器端地址
success: function(request) {
store.loadData(eval(request.responseText));
},
failure: function() {
alert("failure!");
}
});
}
Ext.get("btnRefresh").on("click", fnAjaxDemo);
。。。
html部分:
分类名称：<input type="text" id="ProductName" name="ProductName"/><button id="btnRefresh">查询记录</button>
当然，相应的GetClsData部分也要修改:
[OperationContract]
[WebInvoke(ResponseFormat = WebMessageFormat.Json, Method = "GET", UriTemplate = "GetClsData")]
public T_Class[] GetClsData()
{
string name = CNTVS.TOOLS.Utils.fRequest("name").ToString();
List<T_Class> _Result = new List<T_Class>();
using (DBDataContext db = new DBDataContext())
{
var query = db.T_Classes.Where(c => c.F_Type.ToLower() == "shop");
if (name != "")
{
query = query.Where(p => p.F_ClassName.ToLower().Contains(name.ToLower()));
}
var query2 = query.OrderBy(c => c.F_RootID).ThenBy(c => c.F_Orders).Select(c => new { F_ID = c.F_ID, F_ClassName = c.F_ClassName, F_ParentID = c.F_ParentID, F_Orders = c.F_Orders, F_ReadMe = c.F_ReadMe });
_Result = db.ExecuteQuery<T_Class>(query2, true).ToList<T_Class>();
db.Connection.Close();
}
return _Result.ToArray();
}
最后说明几个注意事项:
1.Ext.onReady(function() {...}这一串script，如果直接写在页面中，必须放在<body>...</body>中，否则网格上右击，设置显示列时，报JS错误，原因不明。
2.WCF的服务端方法，必须设置成JSON格式，另外Method设置为GET，否则运行时，前端页面读不出数据
3.如果设置了autoExpandColumn，则autoExpandColumn对应的列，必须是id对应的列，否则出错
4.服务端的类中，如果有DateTime字符的字段，需要手动修改dbml对应的cs文件，把DateTime改成string，否则序列化时，会产生很怪的值，估计是.Net在序列化成JSON时的bug.
5.为了减少生成的JSON字符串的大小，可以仅在需要输出的类属性上标记[DataMember]，这样在生成的JSON字符串，不会包含未标记为[DataMember]的字段