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Not switches to the next tab When Next button is clicked

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TabStrip
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Nilachandan
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Nilachandan asked on 13 Oct 2008, 08:51 AM
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

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Serrin
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answered on 16 Oct 2008, 04:39 PM
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. :)
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Nilachandan
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answered on 17 Oct 2008, 05:28 AM
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
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Asked by
Nilachandan
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Serrin
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Nilachandan
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