EXTJS学习系列提高篇:第一篇(转载)作者殷良胜,用EXT2.2+vs.2008.net+C#动态生成GridPanel

简介:

简单介绍:

本示例主要用EXT2.2+vs.2008.net+C#+sql Server 2005解决GridPanel动态生成数据列,以减免在Html页面里静态配置数据列所带来的麻烦.为了大家更好的更方便的使用本示例,就附加了一个功能:只要添加本地的数据库连接,选择数据库里面的表,就可以对代码进行测试. 

功能:

1,动态生成数据列,不用手动在ColumnModel里配置

2,根据输入的数据库连接字符串动态生成ComboBox数据表名,然后直接根据表名就可以实现浏览本地的数据表,

3,实现分页

环境:

1,EXT2.2版本

2,vs.net2008+C#

3,sql Server 2005

下面是项目的文件图

截图:

首页

次页

源代码:

<一>Default.aspx页面

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="GridPanel_Default" %>
<!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>无标题页</title>
    <link rel="stylesheet" type="text/css" href="resources/css/ext-all.css"/><%--顺序1--%>
    <script type="text/javascript" src="ExtBase/ext-base.js"></script> <%--顺序2--%>
    <script type="text/javascript" src="ExtBase/ext-all.js"></script> <%--顺序3--%>
    <script type="text/javascript" src="ExtBase/ext-lang-zh_CN.js"></script><%--顺序4--%>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <div id="div1"></div>
    <div id="panel_id"></div>
    <script type="text/javascript">
    var table_Name;
    var panel;
    var data;
    var grid;
    var combobox;
    var URLSTR;
    function DataColumn()
    {
        this.fields = '';
        this.columns = '';       
        this.addColumns=function(name,caption)
        {
            if(this.fields.length > 0)
            {
                this.fields += ',';
            }
            if(this.columns.length > 0)
            {                
                this.columns += ',';
            }            
            this.fields += '{name:"' + name + '"}';
            this.columns += '{header:"' + caption + '",dataIndex:"' + name + '",width:100,sortable:true}';
        };
    }
   function DataGrid(URL)
   { 
        var cm = new Ext.grid.ColumnModel(eval('([' + data.columns + '])'));
        cm.defaultSortable = true; 
        var fields = eval('([' + data.fields + '])');
        var newStore = new Ext.data.Store
        ({
                proxy:new Ext.data.HttpProxy({url:URL}),
                reader:new Ext.data.JsonReader({totalProperty:"totalPorperty",root:"result",fields:fields})
        });  
        newStore.load({params:{start:0,limit:16}}); 
        var pagingBar = new Ext.PagingToolbar
        ({
                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:newStore,
                pageSize:16
        });        
        this.gridPanel = new Ext.grid.GridPanel
        ({
                cm:cm,
                id:"grid_panel",renderTo:"grid_div",
                store:newStore,
                frame:false,
                border:true,                    
                layout:"fit",   
                pageSize:16,    
                autoWidth:true,
                height:400,
                viewConfig:{forceFit:true},
                bbar:pagingBar
        });  
    }    
    
    function MakePanel()
    {
        this.panel_def = new Ext.Panel
        ({
            layout:"fit",
            border:true,
            frame:true,
            title:"数据浏览(请在下面输入数据库连接串:)",
            autoWidth:true,
            height:500,
            id:"Viewport_ID",
            renderTo:"panel_id",
            tbar:
            [
                '',
                '服务器名:',{xtype:'field',id:'dbServerID',width:100,value:"BK5RZVXGSM78C2T"},
                '',
                '用户名:',{xtype:'field',id:'dbUIDID',width:50,value:"sa"},
                '',
                '密码:',{xtype:'field',id:'dbPasswordID',width:50,value:"0"},
                '',
                '数据库名:',{xtype:'field',id:'dbNameID',width:100,value:"Frog"},
                '',
                {text:'确定',pressed:true,handler:event_click_enter,tooltip:"查看数据库连接是否正确"},
                '',
                '<div id="hello"></div>',
                '',
                {text:"<--选择表名",handler:event_select_table,id:"SelectTableID",disabled:false}
            ],
            html: '<div id="grid_div"></div>'                    
        }); 
    }    
    function event_select_table()
    {
        if(!Ext.get("ComboBox_ID"))
        {
            Ext.Msg.alert("警告消息","请先选择数据库!");return;
        }
        var tableName = Ext.util.Format.trim(Ext.get("ComboBox_ID").getValue());
        if(tableName==""||tableName=="请选择表名")
        {
            Ext.Msg.alert("警告消息","请选择表名!");return;
        }
        if(!table_Name)
        {        
            table_Name = tableName;
        }
        else if(table_Name==tableName)
        {
            return;
        }
        else
        {
            if(grid.gridPanel)
            {
                grid.gridPanel.destroy();            
                data.fields = '';
                data.columns = '';
            }
            data.fields = '';
            data.columns = '';
            table_Name = tableName;            
        }
        
        data = new DataColumn();  
        Ext.Ajax.request
        ({
             url:"
JsonData.aspx?param=initDataColumnName&tableName="+tableName,

             success:function(response,option)
             {                 
                 if(response.responseText=="")
                 {
                    Ext.Msg.alert("提示消息","当前所选中的表-->"+tableName+"<--可能没有数据!");return;
                 }
                 var res = Ext.util.JSON.decode(response.responseText);                  
                 for(var i=0;i<res.length;i++)
                 {
                     for(var p in res[i])
                     {
                        data.addColumns(p,p); 
                     }
                 }                  
                 grid = new DataGrid("JsonData.aspx?param=initData&tableName="+tableName);  
             },
             failure:function()
             {
                Ext.Msg.alert("消息","查询出错---->请打开数据库查看数据表名字是否正确");
             }
        });
    }
    function event_click_enter()
    {
        var dbServer = Ext.get("dbServerID").getValue();
        var dbUID = Ext.get("dbUIDID").getValue();
        var dbPassword = Ext.get("dbPasswordID").getValue();
        var dbName = Ext.get("dbNameID").getValue();
        
        var format = Ext.util.Format;
        if(format.trim(dbServer)=="")
        {
            Ext.Msg.alert('警告消息','服务器名称不能够为空');return;
        }
        if(format.trim(dbUID)=="")
        {
            Ext.Msg.alert('警告消息','用户登陆ID不能够为空');return;
        }
        if(format.trim(dbName)=="")
        {
            Ext.Msg.alert('警告消息','数据库名称不能够为空');return;
        }
        var urlStr = "JsonData.aspx?"+"param=initValidateDB"+

                         "&dbServerID="+dbServer+

                         "&dbUIDID="+dbUID+

                         "&dbPasswordID="+dbPassword+

                         "&dbNameID="+dbName;        
        if(!combobox)
        {
            combobox = new MakeComboBox(urlStr);  //addField  
        }
        else
        {
            if(URLSTR!=urlStr)
            {
                combobox.comboBox.destroy();
                combobox = new MakeComboBox(urlStr);
            }            
        }
        URLSTR = urlStr;
        Ext.Msg.alert('提示消息','现在请选择表名');
    }
    function MakeComboBox(URL)
    {     
        var store = new Ext.data.Store
        ({
                proxy: new Ext.data.HttpProxy({url:URL}), // 数据源                
                reader: new Ext.data.JsonReader({},[{name: 'TableName'}])// 如何解析
        });
        store.load();
        this.comboBox = new Ext.form.ComboBox
        ({       
                id:"ComboBox_ID",
                renderTo:"hello",
                editable:false,
                store:store,
                emptyText:'请选择表名',                
                typeAhead: true,
                triggerAction: 'all',
                valueField:'TableName',  
                displayField: 'TableName',
                selectOnFocus:true,                
                width:200,
                resizable:true
                          
        });            
    }
    function  loader()
    {
        Ext.QuickTips.init();
        MakePanel();        
    }
    Ext.onReady(loader);
    </script>
    </div>
    </form>
</body>
</html>

<二>后台代码:

using Newtonsoft.Json;//这个文件必须,请在网上下载,并在项目里对它引用,其他的名字空间省略
public partial class GridPanel_JsonData : System.Web.UI.Page
{
    //初始化连接字符串
    string dbDtr = "server={0};database={1};uid={2};pwd={3}";
    protected void Page_Load(object sender, EventArgs e)
    {
        string param = Convert.ToString(Request["param"]);

        #region 验证数据库连接是否正确,如果正确还需要返回该数据库连接下的所有的表的名称        
        if(param=="initValidateDB")
        {
            string dbServerID = Convert.ToString(Request["dbServerID"]);
            string dbUIDID = Convert.ToString(Request["dbUIDID"]);
            string dbPasswordID = Convert.ToString(Request["dbPasswordID"]);
            string dbNameID = Convert.ToString(Request["dbNameID"]);
            string dbs = String.Format(dbDtr, dbServerID, dbNameID, dbUIDID, dbPasswordID);           
            Session["DBS"] = dbs;            
            Access.connstring = Convert.ToString(Session["DBS"]);
            string sql = String.Format("select [Name] from  {0}..sysobjects WHERE [type] IN (N'U')", dbNameID);
            DataSet ds = Access.GetDataSet(sql);
            if (ds != null && ds.Tables[0].Rows.Count > 0)
            {
                List<Hashtable> testList = new List<Hashtable>();
                for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
                {
                    Hashtable ht = new Hashtable();
                    DataRow row = ds.Tables[0].Rows[i] as DataRow;
                    ht["TableName"] = Convert.ToString(row["Name"]);
                    testList.Add(ht);
                }
                string json = JavaScriptConvert.SerializeObject(testList);
                Response.Write(json);
            }
        }
        #endregion

        #region 分页参数
        int pagesize = 5;
        int start = 1;
        string field, asc_desc;
        if (string.IsNullOrEmpty(Request["sort"]))
        {
            field = "ID";
            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 

        //绑定数据列
        if (param == "initDataColumnName")
        {
            string tableName = Convert.ToString(Request["tableName"]);
            GetDataColumnName(tableName);
        }              
       
        //绑定数据
        if (param == "initData")
        {
            string tableName = Convert.ToString(Request["tableName"]);
            Bind_Data(field, asc_desc, pagesize, start, tableName);
        }      
    }
   
    private void GetDataColumnName(string tableName)
    {
        NewMethod();
        DataSet ds = Access.GetDataSet(String.Format("select top 1 * from {0}",tableName));
        //只要ds不为null,则不管该表是否有数据,都有数据列生成
        if (ds != null)
        {
            List<Hashtable> htList = new List<Hashtable>();
            foreach (DataColumn col in ds.Tables[0].Columns)
            {
                Hashtable ht = new Hashtable();
                ht.Add(col.ColumnName, col.ColumnName);
                htList.Add(ht);
            }
            try
            {
                string json = JavaScriptConvert.SerializeObject(htList);
                Response.Write(json);
            }
            catch (Exception ee)
            {
                string error = ee.Message;
            }
        }
        else
        {
            Response.Write("");
        }
    }

    private void Bind_Data(string field, string asc_desc, int pagesize, int start, string tableName)
    {
        NewMethod();//作用是获取动态生成的数据库连接字符串
        DataSet ds = Business.GetPagingData(field, asc_desc, pagesize, start, tableName);
        if (ds != null && ds.Tables[0].Rows.Count > 0)
        {
            GetJsonData(ds,tableName);
        }
        else
        {
            Response.Write("");
        }
    }

    private void NewMethod()
    {
        if (Session["DBS"] != null && Convert.ToString(Session["DBS"]) != "")
        {
            Access.connstring = Convert.ToString(Session["DBS"]);
        }
        else
        {
            Response.Write(""); return;
        }
    }
    private void GetJsonData(DataSet ds, string tableName)
    {
        NewMethod();
        List<Hashtable> hashList = new List<Hashtable>();
        for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
        {
            DataRow row = ds.Tables[0].Rows[i] as DataRow;
            Hashtable ht = new Hashtable();
            foreach (DataColumn col in ds.Tables[0].Columns)
            {
                ht.Add(col.ColumnName, row[col.ColumnName]);
            }
            hashList.Add(ht);
        }
        int? count = Access.GetCount(String.Format("Select count(*) from {0}",tableName));
        string json = "{totalPorperty:" + count + ",result:" + JavaScriptConvert.SerializeObject(hashList) + "}";
        Response.Write(json);
    }
}

<三>分页功能单独实现

public class Business
{   
    public static DataSet GetPagingData(string field, string asc_desc, int pagesize, int start,string tableName)
    {
        string sql = "WITH MOVIES AS ( " +
                    " SELECT ROW_NUMBER() OVER " +
                    " (ORDER BY " + field + "   "  +  asc_desc  +  " ) AS Row," +
                    " *" +
                    " FROM " + tableName + " )" +
                    " SELECT *" +
                    " FROM MOVIES " +
                    " WHERE Row between (@start-1)* @pagesize+1  and @start*@pagesize";
        SqlParameter[] prams = 
        {
            new SqlParameter("@start",start),
            new SqlParameter("@pagesize",pagesize)
        };
        return Access.GetDataSet(sql, prams);
    }
}

<四>数据库访问层:

public class Access
{
    public Access()
    {    }
    public static string connstring = "";  

    private static void CreateCommand(SqlConnection conn, SqlCommand cmd, string cmdText, params SqlParameter[] prams)
    {
        conn.ConnectionString = Access.connstring;
        if (conn.State == ConnectionState.Closed)
            conn.Open();
        cmd.Connection = conn;
        cmd.CommandText = cmdText;
        if (prams != null)
        {
            foreach (SqlParameter p in prams)
                cmd.Parameters.Add(p);
        }
    }
    public static DataSet GetDataSet(string cmdText)
    {
        return GetDataSet(cmdText,null);
    }
    public static DataSet GetDataSet(string cmdText, params SqlParameter[] prams)
    {
        using (SqlConnection conn = new SqlConnection())
        {
            SqlCommand cmd = new SqlCommand();
            CreateCommand(conn, cmd, cmdText, prams);
            DataSet ds = new DataSet();
            SqlDataAdapter da = new SqlDataAdapter(cmd);
            da.Fill(ds);
            cmd.Parameters.Clear();
            return ds;
        }            
    }
    public static int? GetCount(string cmdText)
    {
        return GetCount(cmdText, null);
    }
    public static int? GetCount(string cmdText,params SqlParameter[] prams)
    {
        using (SqlConnection conn = new SqlConnection())
        {
            SqlCommand cmd = new SqlCommand();
            CreateCommand(conn, cmd, cmdText, prams);
            int? count;
            count = Convert.ToInt32( cmd.ExecuteScalar() );
            cmd.Parameters.Clear();
            return count;
        }
    }
}


本文转自温景良博客园博客,原文链接:http://www.cnblogs.com/wenjl520/archive/2008/11/03/1325561.html,如需转载请自行联系原作者

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