[Solved] Linked Menus

[Michael]

I have 2 menus on a simple ASPX page.  A top menu and a left menu.  The left menu is a subset of data from the item I click on in the top menu.

I can get this to work properly, but ONLY on the first item I click on in the top menu.  After that, the left menu only displays the initial data even though I rebind the menu with the new data set.

Here is my code:

ASPX:
<telerik:RadScriptManager ID="RadScriptManager1" runat="server">
        </telerik:RadScriptManager>
        <telerik:RadMenu ID="mainRadMenu" runat="server" DataSourceID="mainRadMenuXDS" DataTextField="title" OnItemClick="mainRadMenu_ItemClick" PostBackUrl="~/Test.aspx">
            <CollapseAnimation Type="OutQuint" Duration="200"></CollapseAnimation>
        </telerik:RadMenu>
        <asp:XmlDataSource ID="mainRadMenuXDS" runat="server" DataFile="~/App_Data/XMLFile1.xml" XPath="/Items/Item" />
        <br />
        <br />
        <br />
        <br />
        <br />
        <telerik:RadMenu ID="leftRadMenu" runat="server" Flow="Vertical">
            <DefaultGroupSettings Flow="Horizontal" />
            <CollapseAnimation Type="OutQuint" Duration="200"></CollapseAnimation>
        </telerik:RadMenu>
        <asp:XmlDataSource ID="leftRadMenuXDS" runat="server" XPath="/Items/Item" />

CS:
protected void mainRadMenu_ItemClick(object sender, Telerik.Web.UI.RadMenuEventArgs e)
        {
            Session["MainMenu"] = e.Item.Text;

            PopulateLeftMenu();
        }

        protected void PopulateLeftMenu()
        {
            XmlDocument xmldoc = new XmlDocument();
            xmldoc.Load(Server.MapPath("~/App_Data/XMLFile1.xml"));


            XmlNode mainMenuItem = xmldoc.SelectSingleNode(String.Format("//Items//Item[@title = '{0}']", Session["MainMenu"].ToString()));

            XmlDocument leftMenuDocument = new XmlDocument();
            leftMenuDocument.LoadXml(String.Format("<Items>{0}</Items>", mainMenuItem.InnerXml.ToString()));

            leftRadMenuXDS.Data = leftMenuDocument.InnerXml;
            leftRadMenu.DataSourceID = leftRadMenuXDS.UniqueID;
            leftRadMenu.DataTextField = "title";
            leftRadMenu.DataBind();
        }

XML:
<?xml version="1.0" encoding="utf-8" ?>
<Items>
    <Item title="Menu 1" description="">
        <Item title="Menu 1A" description="" />
        <Item title="Menu 1B" description="">
            <Item title="Menu 1B1" description="" />
            <Item title="Menu 1B2" description="" />
            <Item title="Menu 1B3" description="" />
            <Item title="Menu 1B4" description="" />
            <Item title="Menu 1B5" description="" />
        </Item>
        <Item title="Menu 1C" description="" />
    </Item>
    <Item title="Menu 2" description="">
        <Item title="Menu 2A" description="" />
        <Item title="Menu 2B" description="" />
    </Item>
    <Item title="Menu 3" description="">
        <Item title="Menu 3A" description="" />
        <Item title="Menu 3B" description="" />
        <Item title="Menu 3C" description="" />
        <Item title="Menu 3D" description="" />
    </Item>
    <Item title="Menu 4" description="">
        <Item title="Menu 4A" description="" />
        <Item title="Menu 4B" description="" />
        <Item title="Menu 4C" description="" />
        <Item title="Menu 4D" description="" />
    </Item>
    <Item title="Menu 5" description="" />
</Items>

I can see when I debug, that the left menu has no data in it and that the correct data is being databound to it, however I always end up with the inital data.

Any thoughts or suggestions would be GREATLY appreciated!

[Paul]

Hello Michael,

In order to achieve your goal you should disable the XmlDataSource caching:

protected void PopulateLeftMenu()
    {
        XmlDocument xmldoc = new XmlDocument();
        xmldoc.Load(Server.MapPath("~/XMLFile.xml"));

        XmlNode mainMenuItem = xmldoc.SelectSingleNode(String.Format("//Items//Item[@title = '{0}']", Session["MainMenu"].ToString()));

        XmlDocument leftMenuDocument = new XmlDocument();
        leftMenuDocument.LoadXml(String.Format("<Items>{0}</Items>", mainMenuItem.InnerXml.ToString()));

        leftRadMenuXDS.Data = leftMenuDocument.InnerXml;
        leftRadMenuXDS.EnableCaching = false;

        leftRadMenu.DataSource = leftRadMenuXDS;
        leftRadMenu.DataTextField = "title";
        leftRadMenu.Items.Clear();
        leftRadMenu.DataBind();
    }

Kind regards,
Paul
the Telerik team

Instantly find answers to your questions on the new Telerik Support Portal.
Check out the tips for optimizing your support resource searches.