Ext EditGrid 动态加载XML数据

//创建可编辑记录Grid
function createQueryGrid(node)
{
//alert(node.id);
Ext.Ajax.request({
url : 'query.ashx',
params : {
id : dbid,
type : node.id.split('_')[1],
//action : 'first',
obj : node.text,
num : '50',
sod : 'store'
},
method : 'POST',
success : function(response) {
//alert(response.responseText);
var obj = Ext.util.JSON.decode(response.responseText);
var store = new Ext.data.Store(obj.store);
var cm = new Ext.grid.ColumnModel({
// specify any defaults for each column
defaults: {
sortable: true // columns are not sortable by default
},
columns:  obj.columns
});
var grid = new Ext.grid.EditorGridPanel({
id: ('grid_query_'+node.id),
store: store,
cm: cm,
renderTo: ('div_query_'+node.id),
//width: 600,
height: (Ext.getCmp('tab_'+node.id.split('_')[1]+'_'+node.text).getHeight() -30),
//autoExpandColumn: 'common', // column with this id will be expanded
//title: 'Edit Plants?',
frame: true,
clicksToEdit: 1,
tbar: [{
text: '新增记录',
handler : function(){
// access the Record constructor through the grid's store
//                        var item = grid.getStore().recordType;
//                        var p = new item();
//                        grid.stopEditing();
//                        store.insert(0, p);
//                        grid.startEditing(0, 0);
}
}]
});
//alert("toload");
store.load();
},
failure : function(response, options) {
Ext.Msg.alert('错误','操作失败！');
}
});
}

<%@ WebHandler Language="C#" Class="query" %>

using System;
using System.Web;
using System.Data;
using System.Xml;
using SQLite;
using System.Data.SQLite;

public class query : IHttpHandler, System.Web.SessionState.IRequiresSessionState
{

public void ProcessRequest(HttpContext context)
{
string action = context.Request.Params["action"];  //第一次还是第二次打开表
string dbid = context.Request.Params["id"];         //数据库ID
string type = context.Request.Params["type"];       //类型
string obj = context.Request.Params["obj"];         //对象
string firstShowRows = context.Request.Params["num"]; //第一次打开返回行数
string storeOrdata = context.Request.Params["sod"];       //查询表结构或表数据
if (!string.IsNullOrEmpty(dbid) && !string.IsNullOrEmpty(type) && !string.IsNullOrEmpty(obj))
{
if (type.Equals("table") || type.Equals("view"))
{
DataTable dtinfo = SqliteHelper.ExecuteDataSet(AppContainer.AppDBConnection, MapSql.GetMapSql.Sqlmappings["sql.usersdatabase.selectById"], new SQLiteParameter[] {
new SQLiteParameter("@id",dbid)}).Tables[0];
if (storeOrdata.Equals("store"))      //数据结构
{
DataSet ds = SqliteHelper.ExecuteDataSet(AppContainer.getUserDBConnection(dtinfo.Rows[0]["dbFile"].ToString()), "PRAGMA table_info(" + obj + ")", null);
if (ds.Tables.Count > 0)
{
string sc = CreateStoreAndColumns(ds.Tables[0],context.Request);
context.Response.Write(sc);
}
}
else if (storeOrdata.Equals("data"))
{
context.Response.ContentType = "text/xml";  //指定返回XML格式
string sql = "select * from " + obj + " where rowid ";
if (action.Equals("first"))
{
sql += "<=" + firstShowRows;
}
else if (action.Equals("next"))
{
sql += ">" + firstShowRows;
}
DataSet ds = SqliteHelper.ExecuteDataSet(AppContainer.getUserDBConnection(dtinfo.Rows[0]["dbFile"].ToString()), sql, null);
if (ds.Tables.Count > 0)
{
//组织XML文档
DataTable dt = ds.Tables[0];
XmlDocument document = new XmlDocument();
XmlNode root = document.CreateNode(XmlNodeType.Element, "root", "");
foreach (DataRow row in dt.Rows)
{
XmlNode item = document.CreateNode(XmlNodeType.Element, "item", "");
foreach (DataColumn dc in dt.Columns)
{
XmlNode field = document.CreateNode(XmlNodeType.Element, dc.ColumnName, "");
field.InnerText = row[dc].ToString();
item.AppendChild(field);
}
root.AppendChild(item);
}
document.AppendChild(root);
context.Response.Write(document.OuterXml);//输出XML文档
}
}
}
}
context.Response.End();
}
/// <summary>
/// 返回Store及columnModel的Json
/// </summary>
/// <param name="dt"></param>
/// <param name="request"></param>
/// <returns></returns>
private static string CreateStoreAndColumns(DataTable dt,HttpRequest request)
{
//结织返回数据集
System.Text.StringBuilder tables = new System.Text.StringBuilder("{");

//表头
tables.Append("store:{autoDestroy: true,url: \"query.ashx?id=" + request.Params["id"] + "&action=first&type=" + request.Params["type"] + "&obj=" + request.Params["obj"] + "&num=" + request.Params["num"] + "&sod=data\", reader: new Ext.data.XmlReader({record: 'item',fields:[{");
for (int i = 0; i < dt.Rows.Count; i++)
{
tables.Append("name:\"" + dt.Rows[i]["name"].ToString() + "\"");
if (i < dt.Rows.Count - 1)
{
tables.Append("},{");
}
}
tables.Append("}]})},");
//列
tables.Append("columns:[{");
for (int i = 0; i < dt.Rows.Count; i++)
{
tables.Append("id:\"" + dt.Rows[i]["name"].ToString() + "\",");
tables.Append("header:\"" + dt.Rows[i]["name"].ToString() + "\",");
tables.Append("dataIndex:\"" + dt.Rows[i]["name"].ToString() + "\"");
if (i < dt.Rows.Count - 1)
{
tables.Append("},{");
}
}
tables.Append("}]");

tables.Append("}");

return tables.ToString();
}

public bool IsReusable
{
get
{
return false;
}
}

}