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Tooltipified RadGrid - tool tip isn't populating

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ToolTip

This is a migrated thread and some comments may be shown as answers.

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">

<html xmlns="http://www.w3.org/1999/xhtml">

<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;

}

1 Answer, 1 is accepted

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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