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MouseOver tab selection

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TabStrip

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

Tomica asked on 27 Mar 2014, 06:52 PM

I am attempting to add mouseover activation of tabs, per the following article:

http://www.telerik.com/help/aspnet-ajax/tabstrip-change-tabs-mouseover.html

I copied the code, the page loads without error, and the tabs change as intended.

However I get "Line: 75 Error: Unable to get property 'selectParents' of undefined or null reference" as soon as the mouse moves out of the tabstrip control..

Running Win 8.1 with I.E. 11 when the error occurs.

No error with Firefox.

I would like to know what this error is and how I might adjust the code to prevent or ignore.

<%@ Page Language="VB" AutoEventWireup="false" CodeFile="tabstrip_mouseover.aspx.vb" Inherits="tabstrip_mouseover" %>

<!DOCTYPE html>

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

<head runat="server">

<title></title>

</head>

<body>

<form id="form1" runat="server">

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

<script type="text/javascript" language="javascript">

function SelectMyTab(sender, args) {

var multiPageID = sender.get_multiPageID();

sender.set_multiPageID(null);

args.get_tab().select();

sender.set_multiPageID(multiPageID);

}

function UnSelectMyTab(e) {

var tabStrip = $find('<%= RadTabStrip1.ClientID%>');

//Find the element which the mouse is over

var destElement = e.relatedTarget || e.toElement;

if ($telerik.isDescendant(tabStrip.get_element(), destElement))

return;

var initialTab = tabStrip.findTabByText("<%= MyTab %>");

//initialTab.unselect();

initialTab.selectParents();

}

</script>

<telerik:RadTabStrip ID="RadTabStrip1" runat="server" UnSelectChildren="true" OnClientMouseOver="SelectMyTab" ClickSelectedTab="True" AutoPostBack="True" onmouseout="UnSelectMyTab(event)" SelectedIndex="0" Skin="Outlook" MultiPageID="RadMultiPage1">

<Tabs>

<telerik:RadTab ID="Tab1" runat="server" Text="Root Tab 1">

<Tabs>

<telerik:RadTab ID="Tab2" runat="server" Text="Child Tab 1.1" PageViewID="PageView1">

</telerik:RadTab>

<telerik:RadTab ID="Tab3" runat="server" Text="Child Tab 1.2" PageViewID="PageView2">

</telerik:RadTab>

</Tabs>

</telerik:RadTab>

<telerik:RadTab ID="Tab4" runat="server" Text="Root Tab 2">

<Tabs>

<telerik:RadTab ID="Tab5" runat="server" Text="Child Tab 2.1" PageViewID="PageView3">

</telerik:RadTab>

<telerik:RadTab ID="Tab6" runat="server" Text="Child Tab 2.2" PageViewID="PageView4">

</telerik:RadTab>

<telerik:RadTab ID="Tab7" runat="server" Text="Child Tab 2.3" PageViewID="PageView5">

</telerik:RadTab>

</Tabs>

</telerik:RadTab>

<telerik:RadTab ID="Tab8" runat="server" Text="Root Tab 3">

<Tabs>

<telerik:RadTab ID="Tab9" runat="server" Text="Child Tab 3.1" PageViewID="PageView6">

</telerik:RadTab>

</Tabs>

</telerik:RadTab>

</Tabs>

</telerik:RadTabStrip>

<telerik:RadMultiPage ID="RadMultiPage1" runat="server" Height="454px" Width="737px">

<telerik:RadPageView ID="PageView1" runat="server">

Child Tab 1.1</telerik:RadPageView>

<telerik:RadPageView ID="PageView2" runat="server" Width="100%">

Child Tab 1.2</telerik:RadPageView>

<telerik:RadPageView ID="PageView3" runat="server" Width="100%">

Child Tab 2.1</telerik:RadPageView>

<telerik:RadPageView ID="PageView4" runat="server" Width="100%">

Child Tab 2.2</telerik:RadPageView>

<telerik:RadPageView ID="PageView5" runat="server" Width="100%">

Child Tab 2.3</telerik:RadPageView>

<telerik:RadPageView ID="PageView6" runat="server" Width="100%">

Child Tab 3.1</telerik:RadPageView>

</telerik:RadMultiPage>

</form>

</body>

</html>

Imports System

Imports System.Data

Imports System.Data.SqlClient

Imports System.Configuration

Imports System.Collections

Imports System.Web

Imports System.Web.Security

Imports System.Web.UI

Imports System.Web.UI.WebControls

Imports System.Web.UI.WebControls.WebParts

Imports System.Web.UI.HtmlControls

Imports Telerik.Web.UI

Partial Public Class tabstrip_mouseover

Inherits System.Web.UI.Page

Protected MyTab As String

Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)

MyTab = RadTabStrip1.InnermostSelectedTab.Text

End Sub

End Class

MouseOver tab selection

3 Answers, 1 is accepted