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Tooltipified RadGrid - tool tip isn't populating

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ToolTip
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Gulfam
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Gulfam asked on 01 Feb 2011, 10:43 AM
Hello,

I'm trying to implement the Tooltipified RadGrid in my web user control.  I've followed all the instructions  according to your attached file telerikradtooltipsample.zip. I'm also using this example: http://demos.telerik.com/aspnet-ajax/tooltip/examples/targetcontrolsandajax/defaultcs.aspx
I'm working on DotNetNuke and the following exception appears.
Error: TestToolTip is currently unavailable.
DotNetNuke.Services.Exceptions.ModuleLoadException: Object reference not set to an instance of an object. ---> System.NullReferenceException: Object reference not set to an instance of an object. at DotNetNuke.UI.Modules.ModuleHost.LoadModuleControl() --- End of inner exception stack trace ---
My code snippets:

TestToolTip.ascx
<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="TestToolTip.ascx.cs" Inherits="SU_SaleStatisticImport.TestToolTip" %>
<%@ Register Assembly="Telerik.Web.UI" Namespace="Telerik.Web.UI" TagPrefix="Telerik" %>
<%@ Register Src="ActivityDetails.ascx" TagName="ActivityDetails" TagPrefix="uc1" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<head id="Head1" runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <asp:ScriptManager runat="server">
    </asp:ScriptManager>
    <Telerik:RadAjaxLoadingPanel ID="RadAjaxLoadingPanel1" runat="server">
    </Telerik:RadAjaxLoadingPanel>
    <Telerik:RadToolTipManager ID="RadToolTipManager1" OffsetY="-1" HideEvent="ManualClose"
        Width="250" Height="350" runat="server" EnableShadow="true" OnAjaxUpdate="OnAjaxUpdate"
        RelativeTo="Element" Position="MiddleRight">
    </Telerik:RadToolTipManager>
    <Telerik:RadAjaxManager ID="RadAjaxManager1" runat="server">
        <AjaxSettings>
            <Telerik:AjaxSetting AjaxControlID="rgCampaigns">
                <UpdatedControls>
                    <Telerik:AjaxUpdatedControl ControlID="rgCampaigns" LoadingPanelID="RadAjaxLoadingPanel1" />
                    <Telerik:AjaxUpdatedControl ControlID="RadToolTipManager1" />
                </UpdatedControls>
            </Telerik:AjaxSetting>
        </AjaxSettings>
    </Telerik:RadAjaxManager>
    <Telerik:RadGrid ID="rgCampaigns" runat="server" OnItemDataBound="rgCampaigns_ItemDataBound"
        AutoGenerateColumns="false">
        <MasterTableView runat="server" DataKeyNames="GlobalCode">
            <Columns>
                <Telerik:GridTemplateColumn HeaderText="First">
                    <ItemTemplate>
                        <asp:Label ID="lblTitle" runat="server" Text="Show ToolTip"></asp:Label>
                    </ItemTemplate>
                </Telerik:GridTemplateColumn>
                <Telerik:GridBoundColumn DataField="SecondColumn" HeaderText="Second">
                </Telerik:GridBoundColumn>
            </Columns>
        </MasterTableView>
    </Telerik:RadGrid>
    </form>
</body>
</html>

TestToolTip.ascx.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using Telerik.Web.UI;
 
namespace SU_SaleStatisticImport
{
    public partial class TestToolTip : System.Web.UI.UserControl
    {
        protected System.Data.DataTable GetData()
        {
            System.Data.DataTable tbl = new System.Data.DataTable();
            tbl.Columns.Add(new System.Data.DataColumn("GlobalCode"));
            tbl.Columns.Add(new System.Data.DataColumn("SecondColumn"));
            tbl.Columns.Add(new System.Data.DataColumn("ThirdColumn"));
            tbl.Columns.Add(new System.Data.DataColumn("FourthColumn"));
            tbl.Rows.Add(new object[] { "firstRecord1", "firstRecord2", "firstRecord3", "firstRecord4" });
            tbl.Rows.Add(new object[] { "secondRecord1", "secondRecord2", "secondRecord3", "secondRecord4" });
            tbl.Rows.Add(new object[] { "thirdRecord1", "thirdRecord2", "thirdRecord3", "thirdRecord4" });
            return tbl;
 
        }
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                rgCampaigns.DataSource = GetData();
                rgCampaigns.DataBind();
            }
        }
 
        protected void OnAjaxUpdate(object sender, ToolTipUpdateEventArgs args)
        {
            this.UpdateToolTip(args.Value, args.UpdatePanel);
        }
        private void UpdateToolTip(string ActivityCode, UpdatePanel panel)
        {
            Control ctrl = Page.LoadControl("~/ActivityDetails.ascx");
            panel.ContentTemplateContainer.Controls.Add(ctrl);
 
            ActivityDetails details = (ActivityDetails)ctrl;
            details.ActivityCode = ActivityCode;
 
        }
 
        protected void rgCampaigns_ItemDataBound(object sender, Telerik.Web.UI.GridItemEventArgs e)
        {
 
            if (e.Item.ItemType == GridItemType.Item || e.Item.ItemType == GridItemType.AlternatingItem)
            {
                Control target = e.Item.FindControl("lblTitle");
                if (!Object.Equals(target, null))
                {
                    if (!Object.Equals(this.RadToolTipManager1, null))
                    {
                        //Add the button (target) id to the tooltip manager
                        this.RadToolTipManager1.TargetControls.Add(target.ClientID, (e.Item as GridDataItem).GetDataKeyValue("GlobalCode").ToString(), true);
 
                    }
                }
            }
 
 
        }
    }
}

ActivityDetails.ascx
<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="ActivityDetails.ascx.cs" Inherits="SU_SaleStatisticImport.ActivityDetails" %>
<asp:label id="lbltest" runat="server" text="Label"></asp:label>

ActivityDetails.ascx.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
 
namespace SU_SaleStatisticImport
{
    public partial class ActivityDetails : System.Web.UI.UserControl
    {
        public string ActivityCode
        {
            get
            {
                if (ViewState["ActivityCode"] == null)
                {
                    return "";
                }
                return (string)ViewState["ActivityCode"];
            }
            set
            {
 
                ViewState["ActivityCode"] = value;
 
            }
        }
 
        protected void Page_Load(object sender, EventArgs e)
        {
            lbltest.Text += "<br>Activity code: " + ActivityCode;
        }
    }
}

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Svetlina Anati
Telerik team
answered on 03 Feb 2011, 03:17 PM
Hi Gulfam,

 The error is a general ASP.NET error that shows that some object you have referenced is null and you are trying to set its property or call its method. I can see from your code that this is not the target nor the RadToolTipManager but I cannot tell which is the missing object without debugging a working sample.

What I can suggest is to carefully debug the server code until you find out which is the missing object - this should be your custom code because the RadToolTipManager itself does not have null references to child controls.

In case you need further assistance, please prepare a sample, fully runnable reproduction demo with the problem isolated (do not include the Telerik.Web.UI.dll), upload it somewhere on the net and provide a download url along with detailed reproduction steps and we will do our best to help.

Best wishes,
Svetlina
the Telerik team
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ToolTip
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Gulfam
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Svetlina Anati
Telerik team
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