Not switches to the next tab When Next button is clicked

[Nilachandan]

Hi Telerik

I am creating Dynamic Rad Strip which is having 3 Rad Tabs namely "Newly Added", "Popular", "Create New". Now I have one button in Rad Tab1(Newly Added) by clicking which, I want to be in Rad Tab3(Create New) enable. I am following your "Wizard" example that switches to the next tab. But in my case, when I am hitting the Button the Error "Object reference not set to an instance of an object" is giving in the line having red color.

private void GoToNextTab()

    {

        try

        {

            RadTabStrip tabStrip = (RadTabStrip)Page.FindControl("ForumRadTabStrip");

            RadTab professionalInfoTab = tabStrip.FindTabByText("Create New");          

            //LinkButton1.Text = tabStrip.FindTabByText("Newly Added").Text;            

            //professionalInfoTab.Enabled = true;

            //professionalInfoTab.Selected = true;

        }

        catch (Exception ex)

        {

            LinkButton1.Text = ex.Message;

        }

    }

Why this is happening?

Regards,

Chandan

[Serrin]

Hey Chandan,

Hmm, the code you gave down there is working just as expected.  I'm able to set the current tab to professionalInfoTab, create a new tab based on it, etc, etc...  My best guess is there is an issue in the code that creates the tabstrip/multipage dynamically.  Would you be able to post that code so we can troubleshoot it?

Also, just curious, are you creating the objects server-side or client-side?  Although I guess seeing the code will answer that one. :)

[Nilachandan]

Hi Serrin

Thank you for help. I think, I should post all the three pages in which my code lies. those three pages namely Default.aspx, PersonalCs.ascx and ProfessionalCS.ascx.

The codes for Default.aspx is as follows

<asp:ScriptManager ID="ScriptManager1" runat="server">

</asp:ScriptManager>

<telerik:RadDockLayout ID="RadDockLayout1" Runat="server" Skin="Office2007">

<telerik:RadDockZone ID="RadDockZone1" Runat="server" Height="300px" Width="400px">

<telerik:RadDock ID="RadDock1" Runat="server" Width="300px">

<ContentTemplate>

<asp:UpdatePanel ID="UpdatePanel1" runat="server">

<ContentTemplate>

<telerik:RadTabStrip ID="RadTabStrip1" runat="server" CssClass="tabStrip" 

MultiPageID="RadMultiPage1" SelectedIndex="0" Skin="Hay">

</telerik:RadTabStrip>

<telerik:RadMultiPage ID="RadMultiPage1" runat="server" CssClass="multiPage" 

OnPageViewCreated="RadMultiPage1_PageViewCreated" SelectedIndex="0">

</telerik:RadMultiPage>

</ContentTemplate>

</asp:UpdatePanel>

</ContentTemplate>

</telerik:RadDock>

</telerik:RadDockZone>

</telerik:RadDockLayout>

Page behind page default.aspx.cs is as follows

public partial class _Default : System.Web.UI.Page

{

    protected void Page_Load(object sender, EventArgs e)

    {

        if (!Page.IsPostBack)

        {

            AddTab("Personal Info", true);

            RadPageView pageView = new RadPageView();

            pageView.ID = "Personal";

            RadMultiPage1.PageViews.Add(pageView);

            AddTab("Education Info", true);

            AddTab("Professional Info", true);

        }

    }

    private void AddTab(string tabName, bool enabled)

    {

        RadTab tab = new RadTab(tabName);

        tab.Enabled = enabled;

        RadTabStrip1.Tabs.Add(tab);

    }

    protected void RadMultiPage1_PageViewCreated(object sender, RadMultiPageEventArgs e)

    {

        Control pageViewContents = LoadControl(e.PageView.ID + "CS.ascx");

        pageViewContents.ID = e.PageView.ID + "userControl";

        e.PageView.Controls.Add(pageViewContents);

    }

}

The codes for PersonalCs.ascx is as follows:

<div class="buttonSeparator">

    <asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>

</div>

<asp:Button runat="server" ID="nextButton" Text="Next" OnClick="nextButton_Click"  CssClass="nextButton" />

Page behind page PersonalCs.ascx.cs is as follows:

public partial class PersonalCS : System.Web.UI.UserControl

{

protected void Page_Load(object sender, System.EventArgs e)

{

}

protected void nextButton_Click(object sender, EventArgs e)

{

UpdatePreview();

GoToNextTab();

}

private void GoToNextTab()

{

            try

            {

                RadTabStrip tabStrip = (RadTabStrip)Page.FindControl("RadTabStrip1");

                Label1.Text = tabStrip.ID.ToString();

                Label1.Text=tabStrip.ClientID.ToString();

                RadTab educationInfoTab = tabStrip.FindTabByText("Education Info");

                educationInfoTab.Enabled = true;

                educationInfoTab.Selected = true;

                GoToNextPageView();

            }

            catch (Exception ex)

            {

                Label1.Text = ex.Message;

            }

}

private void GoToNextPageView()

{

RadMultiPage multiPage = (RadMultiPage)Page.FindControl("RadMultiPage1");

RadPageView educationInfoPageView = multiPage.FindPageViewByID("Education");

if (educationInfoPageView == null)

{

educationInfoPageView = new RadPageView();

educationInfoPageView.ID = "Education";

multiPage.PageViews.Add(educationInfoPageView);

}

educationInfoPageView.Selected = true;

}

private void UpdatePreview()

{

Control previewControl = Page.FindControl("previewControl");

}

}

The whole thing works fine, if don't put the RadTabStrip inside a RadDock.

Regards,

Chandan