Creating web server control

[Tiago]

Hello,

When I create a Web Server Control with RadAjaxManager, RadAjaxLoadingPanel and RadGrid inside, all working properly, but if for example I change page on RadGrid, Ajax works fine, but on second time I change the page, Ajax stops working, and the third time I change page, Ajax works fine again...

I don't understand why this append

My code here...

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using Telerik.Web.UI;
using System.IO;
using System.Reflection;
using darwin.sadj.shared.core;
[assembly: WebResource("darwin.sadj.shared.ui.etiqueta.Imagens.delete.gif", "image/gif")]
namespace darwin.sadj.shared.ui.etiqueta
{
    [ToolboxData("<{0}:ListEtiqueta runat=server></{0}:ListEtiqueta>")]
    public class ListEtiqueta : WebControl
    {
        private RadGrid gridEtiquetas { get; set; }
        private RadAjaxManager RadAjaxManager1 { get; set; }
        private RadAjaxLoadingPanel RadAjaxLoadingPanel1 { get; set; }
        protected override void OnInit(EventArgs e)
        {
            this.Controls.Clear();
            RadAjaxLoadingPanel1 = new RadAjaxLoadingPanel();
            RadAjaxLoadingPanel1.ID = this.ID + "_RadAjaxLoadingPanel";
            this.Controls.Add(RadAjaxLoadingPanel1);
            RadAjaxManager1 = new RadAjaxManager();
            RadAjaxManager1.ID = this.ID + "_RadAjaxManager";
            this.Controls.Add(RadAjaxManager1);
            gridEtiquetas = new RadGrid();
            gridEtiquetas.ID = this.ID + "_gridEtiquetas";
            gridEtiquetas.NeedDataSource += new GridNeedDataSourceEventHandler(gridEtiquetas_NeedDataSource);
            gridEtiquetas.ItemCommand += new GridCommandEventHandler(gridEtiquetas_ItemCommand);
            this.Controls.Add(gridEtiquetas);
            base.OnInit(e);
        }
        protected override void RenderContents(HtmlTextWriter output)
        {
            if (this.Visible == true)
            {
                this.RadAjaxLoadingPanel1.RenderControl(output);
                this.RadAjaxManager1.RenderControl(output);
                this.gridEtiquetas.RenderControl(output);
            }
        }
        protected override void OnLoad(EventArgs e)
        {
            if (!this.Page.IsPostBack)
            {
                GridBoundColumn colunaID = new GridBoundColumn();
                gridEtiquetas.Columns.Add(colunaID);
                colunaID.DataField = "Id";
                colunaID.UniqueName = "Id";
                colunaID.HeaderText = "Id";
                GridBoundColumn colunaDescricao = new GridBoundColumn();
                gridEtiquetas.Columns.Add(colunaDescricao);
                colunaDescricao.DataField = "Descricao";
                colunaDescricao.UniqueName = "Descricao";
                colunaDescricao.HeaderText = "Descrição";
                GridButtonColumn colunaDelete = new GridButtonColumn();
                gridEtiquetas.Columns.Add(colunaDelete);
                colunaDelete.ButtonType = GridButtonColumnType.ImageButton;
                colunaDelete.CommandName = "Delete";
                colunaDelete.ConfirmDialogType = GridConfirmDialogType.RadWindow;
                colunaDelete.ConfirmText = "Deseja apagar este registo?";
                colunaDelete.ConfirmTitle = "Confirmação";
                colunaDelete.ImageUrl = Page.ClientScript.GetWebResourceUrl(this.GetType(), "darwin.sadj.shared.ui.etiqueta.Imagens.delete.gif");
                colunaDelete.Text = "Apagar";
                colunaDelete.UniqueName = "colunaDelete";
                colunaDelete.ItemStyle.Width = Unit.Pixel(22);
            }
            gridEtiquetas.AutoGenerateColumns = false;
            gridEtiquetas.GridLines = GridLines.None;
            gridEtiquetas.MasterTableView.AllowCustomPaging = true;
            gridEtiquetas.MasterTableView.AllowPaging = true;
            gridEtiquetas.MasterTableView.PagerStyle.Mode = GridPagerMode.NextPrev;
            gridEtiquetas.MasterTableView.DataKeyNames = new string[] { "Id" };
            RadAjaxManager1.AjaxSettings.AddAjaxSetting(gridEtiquetas, gridEtiquetas, RadAjaxLoadingPanel1);

            base.OnLoad(e);
        }
        protected void gridEtiquetas_NeedDataSource(object source, GridNeedDataSourceEventArgs e)
        {
            EtiquetaController controller = new EtiquetaController();
            int TotalRecords = 0;
            ((RadGrid)source).DataSource = controller.getListEtiqueta(((RadGrid)source).MasterTableView.CurrentPageIndex, ((RadGrid)source).MasterTableView.PageSize, out TotalRecords);
            ((RadGrid)source).MasterTableView.VirtualItemCount = TotalRecords;
        }
        protected void gridEtiquetas_ItemCommand(object source, GridCommandEventArgs e)
        {
            if (e.CommandName == "Delete")
            {
                EtiquetaController controller = new EtiquetaController();
                controller.deleteEtiqueta(Convert.ToInt64(e.Item.OwnerTableView.DataKeyValues[e.Item.ItemIndex]["Id"]));
            }
        }
    }
}

[Nikolay Rusev]

Hello Tiago,

I am afraid that you cannot render RadAjaxManager as in your code. You  should simply call the base of RenderContents to have RadAjaxManager function properly.

1.protected override void RenderContents(HtmlTextWriter output)
2.{
3.   base.RenderContents(output);
4.}

Greetings,
Nikolay
the Telerik team

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