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Load on Demand PageViewCreated not called

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TabStrip
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Martin Roussel
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Martin Roussel asked on 08 Jan 2013, 06:40 PM
Hi,

sorry to create another Load On Demand post but it seems I cant find my issue in the previous ones Ive searched in. In my case, when trying to implement Load On Demand on my RadTabStrip, Ive noticed a weird behavior in the code.

When clicking on the tabs in the order they are presented and I skip one, then when I click on that skipped tab, its RadMultiPage's PageViewCreated dont get called. By looking at the tab's OnClientTabSelecting client-side function, it seems the tab already has a pageview assigned and it's id is the same then the tab we click when doing the skipping.

Here's the code to replicate the problem with 4 tabs:
<%@ Page Language="C#" AutoEventWireup="True" Inherits="PL.Test" Codebehind="Test.aspx.cs" %>
<%@ Register TagPrefix="telerik" Namespace="Telerik.Web.UI" Assembly="Telerik.Web.UI" %>
 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/tr/xhtml11/dtd/xhtml11.dtd">
 
<head id="Head1" runat="server">
    <title></title>
</head>
<body>
 
    <telerik:RadCodeBlock ID="RadCodeBlock1" runat="server">
        <script type="text/javascript">
            function onTabSelecting(sender, args) {
 
                if (args.get_tab().get_pageView()) {
                    if (args.get_tab().get_pageView().get_id()) {
                        alert("pageview of ID: " + args.get_tab().get_pageView().get_id() + " already loaded");
                        args.get_tab().set_postBack(false);
                    }
                }
            }
                    
        </script>
    </telerik:RadCodeBlock>
 
    <form id="form1" runat="server">
 
    <telerik:RadScriptManager runat="server" ID="RadScriptManager1" />
 
 
            <telerik:RadAjaxManager ID="RadAjaxManager1" runat="server" >
                  <AjaxSettings>
                        <telerik:AjaxSetting AjaxControlID="RadTabStrip1">
                            <UpdatedControls>
                                <telerik:AjaxUpdatedControl ControlID="RadTabStrip1">
                                </telerik:AjaxUpdatedControl>
                                <telerik:AjaxUpdatedControl ControlID="RadMultiPage1" LoadingPanelID="RadAjaxLoadingPanel1">
                                </telerik:AjaxUpdatedControl>
                            </UpdatedControls>
                        </telerik:AjaxSetting>
                        <telerik:AjaxSetting AjaxControlID="RadMultiPage1">
                            <UpdatedControls>
                                <telerik:AjaxUpdatedControl ControlID="RadMultiPage1" LoadingPanelID="RadAjaxLoadingPanel1">
                                </telerik:AjaxUpdatedControl>
                            </UpdatedControls>
                        </telerik:AjaxSetting>
                         <telerik:AjaxSetting AjaxControlID="RadAjaxManager1">
                            <UpdatedControls>
                                <telerik:AjaxUpdatedControl ControlID="RadTabStrip1" LoadingPanelID="RadAjaxLoadingPanel1">
                                </telerik:AjaxUpdatedControl>
                            </UpdatedControls>
                        </telerik:AjaxSetting>
                </AjaxSettings>
            </telerik:RadAjaxManager>
            <telerik:RadAjaxLoadingPanel ID="RadAjaxLoadingPanel1" runat="server" Skin="WebBlue" />
              
 
                    <telerik:RadTabStrip ID="RadTabStrip1" runat="server" AutoPostBack="false" Skin="WebBlue" EnableDragToReorder="true"  MultiPageID="RadMultiPage1" Orientation="HorizontalTop"
                    SelectedIndex="0" OnTabClick="RadTabStrip1_TabClick" OnClientTabSelecting="onTabSelecting" >
                    </telerik:RadTabStrip>
 
                     
 
                    <telerik:RadMultiPage ID="RadMultiPage1" runat="server" SelectedIndex="0" OnPageViewCreated="RadMultiPage1_PageViewCreated">
                    </telerik:RadMultiPage>
           
 
    </form>
</body>
</html>

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 PL
{
    public partial class Test : System.Web.UI.Page
    {
 
 
        protected void Page_Load(object sender, EventArgs e)
        {
 
            if (!IsPostBack)
            {
                CreateTabs();
            }
 
        }
 
 
        private void CreateTabs()
        {
            AddNewTab(1);
            AddNewTab(2);
            AddNewTab(3);
            AddNewTab(4);
 
            RadTabStrip1.DataBind();
        }
 
        
        private void AddNewTab(int intTabIndex)
        {
            RadTab rootTab = null;
            RadPageView pv = null;
 
            rootTab = new RadTab();
            RadTabStrip1.Tabs.Add(rootTab);
 
 
            rootTab.Text = "Tab" + " " + intTabIndex.ToString();
            rootTab.Value = "Tab_" + intTabIndex.ToString();
 
 
            if (intTabIndex == 1)
            {
                pv = new RadPageView();
                pv.ID = rootTab.Value;
                RadMultiPage1.PageViews.Add(pv);
 
 
                RadTabStrip1.Tabs[RadTabStrip1.Tabs.Count - 1].Selected = true;
                RadMultiPage1.PageViews[RadMultiPage1.PageViews.Count - 1].Selected = true;
 
                 
            }
 
            
 
        }
 
        protected void RadMultiPage1_PageViewCreated(object sender, RadMultiPageEventArgs e)
        {
            Console.WriteLine(e.PageView.ID);
        }
 
        
 
        protected void RadTabStrip1_TabClick(object sender, RadTabStripEventArgs e)
        {
            AddPageView(e.Tab);
            e.Tab.PageView.Selected = true;
        }
 
        private void AddPageView(RadTab tab)
        {
            RadPageView pv = new RadPageView();
            pv.ID = tab.Value;
            RadMultiPage1.PageViews.Add(pv);
            tab.PageViewID = pv.ID;
 
        }
 
 
         
    }
}

Page will start and create Tab 1. If you click on Tab 3 then Tab 2, you'll notice that Tab 2 pageview ID is already known and that "RadMultiPage1_PageViewCreated" doesnt get called. Same if you refresh and click Tab 2, then Tab 4 and then Tab 3. If you go 2, 3 and 4, all is fine. Is something wrong in my code?

TIA

Martin

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Nencho
Telerik team
answered on 11 Jan 2013, 01:32 PM
Hello Martin,

Actually, the implementation that you use is the correct one. But, I can suggest you to use the get_pageViewID method, like it is demonstrated in our online demo here. Please consider the following implementation :
function onTabSelecting(sender, args) {
               if (args.get_tab().get_pageViewID()) {
 
                   alert("pageview of ID: " + args.get_tab().get_pageViewID() + " already loaded");
                   args.get_tab().set_postBack(false);
               }
           }


Greetings,
Nencho
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Martin Roussel
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answered on 11 Jan 2013, 07:28 PM
Nencho, this seems to solve the tab skipping problem Ive reported.

Thanks,

Martin
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Martin Roussel
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Nencho
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Martin Roussel
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