Reconfiguring GRIDPANEL via metadata from server - MetaChange Listener on Store

  1. #1

    PaginToolBar after configuring GRIDPANEL via metadata from server - MetaChange Listener on Store

    Hi Everybody,
    I'm referring to the following example

    I find that this is a very useful fast way to load data in grid.

    I just added a PagingToolbar to navigate data faster

                        DisplayMsg="Displaying records {0} - {1} of {2}"
                        EmptyMsg="No record to display" />

    After I ask to change page via PagingToolBar a new call to the MetaChange listener is fired and view on data doesn't change.

    Do I miss something in the logic ?

    I tried to return only data and not metadata, to set a condition on executing MetaChange only on start but without any change

                new StoreResponseData
                    Data = JSON.Serialize(data),
                    //MetaData = metaData
    Here below my complete example follows

    <%@ Page Language="C#" %>
    <%@ Register Assembly="Ext.Net" Namespace="Ext.Net" TagPrefix="ext" %>
    <!DOCTYPE html>
    <head id="Head1" runat="server">
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <title>Testing wonderful metachange way to conf and load GridPanel</title>
    <script type="text/javascript">
        <form id="Form1" runat="server">
            <ext:ResourceManager ID="ResourceManager1" runat="server" />
            <ext:GridPanel ID="GridPanel1" StateID="Grid1" Stateful="true" runat="server" Region="Center"
                Frame="true" Title="Testing data" Margins="0 0 0 0" Width="800"
                    <ext:Store runat="server" RemoteSort="false" PageSize="10">
                            <ext:Model runat="server" Name="MetaModel">
                            <ext:AjaxProxy Url="GetData.ashx" />
                            <MetaChange Handler="#{GridPanel1}.reconfigure(store, meta.columns);" />
                    <ext:GridView ID="GridView1" runat="server" LoadMask="false" StripeRows="true" TrackOver="true" />
                        DisplayMsg="Displaying records {0} - {1} of {2}"
                        EmptyMsg="No record to display" />
    and the GetData.ashx file

    <%@ WebHandler Language="C#" Class="DataHandling.GetData" %>
    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Web;
    using Ext.Net;
    using System.Data;
    /// <summary>
    /// Summary description for GetData
    /// </summary>
    namespace DataHandling
        public class GetData : IHttpHandler
            public void ProcessRequest(HttpContext context)
                object data;
                data = GetDataFromDB();
                MetaConfig metaData = MetaConfig.From(data);
                metaData.IDProperty = "ID";
                metaData.Columns[0].Flex = 0;
                metaData.Root = "data";
                new StoreResponseData
                    Data = JSON.Serialize(data),
                    MetaData = metaData
            public DataTable GetDataFromDB()
                // load data from mydb
                // return DrvSS_Parametri.getDataQuery("select * from mytable");
                DataTable table = new DataTable();
                table.Columns.Add("Id", typeof(int));
                table.Columns.Add("Surname", typeof(string));
                table.Columns.Add("Nick", typeof(string));
                table.Columns.Add("Event Date", typeof(DateTime));
                table.Rows.Add(25, "Johnson", "JD", DateTime.Now);
                table.Rows.Add(50, "Frank", "FDK", DateTime.Now);
                table.Rows.Add(10, "Jack", "JFK", DateTime.Now);
                table.Rows.Add(21, "Bobby", "RFK", DateTime.Now);
                table.Rows.Add(100, "The Dancers", "CZT", DateTime.Now);
                table.Rows.Add(101, "The Dancers1", "CZT", DateTime.Now);
                table.Rows.Add(102, "The Dancers2", "CZT", DateTime.Now);
                table.Rows.Add(103, "The Dancers3", "CZT", DateTime.Now);
                table.Rows.Add(104, "The Dancers4", "CZT", DateTime.Now);
                table.Rows.Add(105, "The Dancers5", "CZT", DateTime.Now);
                table.Rows.Add(106, "The Dancers6", "CZT", DateTime.Now);
                table.Rows.Add(107, "The Dancers7", "CZT", DateTime.Now);
                table.Rows.Add(108, "The Dancers8", "CZT", DateTime.Now);
                table.Rows.Add(109, "The Dancers9", "CZT", DateTime.Now);
                return table;
            public bool IsReusable
                    return false;
    thanks in advance
    Last edited by tanky65; Nov 23, 2018 at 11:27 AM. Reason: to explain better
  2. #2
    I think I should pass parameters to the Proxy to handle the set of data to get back as discussed here

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