Setting Active Tab on Page load

I have a Set of tabs(5 total), each tab has a listview on it.  Control works fine when switching tabs and loading data.  The problem arrises when I try to change the selected tab when the user first request the page and has a value in the request url.  Example MYPage.aspx?t=3, so the page defaults to tab 3 instead of the first tab.  The error the pops up is the listview on the tab doesn’t exist

The error I get says it can’t find the listview control on the page…

Error Message

IPageableItemContainer ‘listview3’ not found.
Description: An unhandled exception occurred during the execution of the current web request.  Exception Details: System.InvalidOperationException: IPageableItemContainer ‘listview3’ not found.

Sample Code in page_init

If Not Request.Item(“t”) Is Nothing Then
If IsNumeric(Request.Item(“t”)) Then
WebTab1.SelectedIndex = CInt(Request.Item(“t”))
End If
Else
WebTab1.SelectedIndex = 0
End If

Strip down sample of webtab, I have removed the tabs/control in tab since the code is huge.

HTML/Control

<ig:WebTab ID=”WebTab1″ runat=”server” Height=”550px” Width=”100%” onselectedindexchanged=”WebTab1_SelectedIndexChanged” StyleSetName=”Default”>
<tabs>
</tabs>
<PostBackOptions EnableLoadOnDemandUrl=”true” EnableLoadOnDemand=”true” EnableReloadingUnselectedTab=”true” EnableAjax =”true”/>
<AutoPostBackFlags SelectedIndexChanged =”On”/>
</ig:WebTab>

I am hoping I am just setting the active tab wrong, or at the wrong time, or there is something else I am missing.

 

Hi Rob,

As far as I understand, this might be a problem with the page life cycle in which the WebTab resides. Your sample code in page_init I think should be implemented during page load and not during its initialization when the controls are loaded.

If you are working in C#, you can try this in the Target page's behind code:

protected void Page_Load(object sender, EventArgs e)
        {
         
            string s = Request.QueryString["t"];
            if (s != null)
            {
                WebTab1.SelectedIndex = int.Parse(s);
            }
            else
            {
                WebTab1.SelectedIndex = 0;
            }
        }

Regards

 

 

Moved the logic to Page_Load but getting the same error.

 

 Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

  If Not Page.IsPostBack Then
   'First Load
   If Not Request.Item("t") Is Nothing Then
    If IsNumeric(Request.Item("t")) Then
     WebTab1.SelectedIndex = CInt(Request.Item("t"))
    End If
   Else
    WebTab1.SelectedIndex = 0
   End If

  Else
   'Post Back

  End If

 End Sub

Hopefully the following info will help someone else.  I was finally able to determine why I couldn't set the SelectedIndex on pageload.  It's definitely a Infragistics bug, but at least I figure it out and found a way around it.

The Problem… a review

On each of the tabs I had there was a just a listview control, whenever I tried to specify the tab it would say it couldn't find this control "IPageableItemContainer 'listview' not found"  and the page would bomb.  

Work Around … the real problem

I figured out it wasn't the listview, it was the datapager above the listview.  The datapager refers to the listview, but apparently something it not loading properly when I set the selectedindex server side.  If I remove the pager or move the pager to be only under the listview the selectedindex setting works.  Its not a perfect fix since I always have my paging at the top and bottom of listviews but at least there is a work around. 

Hopefully someone from Infragistics can reproduce this problem now that I have more info and can fix it. 

<asp:DataPager ID="datapageernamehere" runat="server" PagedControlID="listviewnamehere" PageSize="20">
           <Fields>
            <asp:NumericPagerField ButtonType="Link" />
           </Fields>
          </asp:DataPager>