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Related DropDownLists

Select Vehicle Type...
Select Vehicle Brand...
Select Vehicle Model...

This demo presents how to create related RadDropDownList controls. The Data in the Model RadDropDownList depends on the previous selection in the Type and Brand DropDownLists

  • DefaultVB.aspx
  • DefaultVB.aspx.vb
  • styles.css
<%@ Page Language="VB" AutoEventWireup="false" CodeFile="DefaultVB.aspx.vb" Inherits="DropDownList.Examples.ApplicationScenarios.CascadingDropDownLists.DefaultVB" %>

<!DOCTYPE html>
<html xmlns='http://www.w3.org/1999/xhtml'>
<head runat="server">
    <title>Telerik ASP.NET Example</title>
    <link rel="stylesheet" type="text/css" href="styles.css" />
</head>

<body>
    <form id="form1" runat="server">
    <telerik:RadScriptManager runat="server" ID="RadScriptManager1" />
    <telerik:RadSkinManager ID="RadSkinManager1" runat="server" ShowChooser="true" />

    <div class="demo-container no-bg">
        <telerik:RadAjaxPanel ID="RadAjaxPanel" runat="server">
            <table>
                <tbody class="order">
                    <tr>
                        <td>
                            <telerik:RadDropDownList RenderMode="Lightweight" runat="server" ID="DropDownVehicleType" 
                                Skin="Silk" TabIndex="1" Width="200" DropDownWidth="200" DefaultMessage="Select Vehicle Type..."
                                AutoPostBack="true" OnSelectedIndexChanged="DropDownVehicleType_SelectedIndexChanged"
                                DataSourceID="SqlDataSource1" DataTextField="TypeName" DataValueField="ID">
                            </telerik:RadDropDownList>
                        </td>
                        <td>
                            <telerik:RadDropDownList RenderMode="Lightweight" runat="server" ID="DropDownVehicleBrand" 
                                Skin="Silk" TabIndex="1" Width="200" DropDownWidth="200"
                                DefaultMessage="Select Vehicle Brand..." AutoPostBack="true"
                                OnSelectedIndexChanged="DropDownVehicleBrand_SelectedIndexChanged"
                                DataSourceID="SqlDataSource2" DataTextField="VehicleName" DataValueField="ID">
                            </telerik:RadDropDownList>
                        </td>
                        <td>
                            <telerik:RadDropDownList RenderMode="Lightweight" runat="server" ID="DropDownVehicleModel" 
                                Skin="Silk" TabIndex="1" Width="200" DropDownWidth="200" DefaultMessage="Select Vehicle Model..."
                                DataSourceID="SqlDataSource3" DataTextField="VehicleName">
                            </telerik:RadDropDownList>
                        </td>
                        <td class="buttons">
                            <telerik:RadButton RenderMode="Lightweight" ID="btnGetData" Skin="Silk"  Text="Select Vehicle" OnClick="btnGetData_Click" runat="server" />
                        </td>
                    </tr>
                </tbody>
            </table>
            <asp:PlaceHolder runat="server" ID="OrderTable" Visible="false">
                <table class="order-summary">
                    <tbody>
                        <tr>
                            <th>Vehicle Type:
                            </th>
                            <td>
                                <asp:Label ID="labelVehicleType" runat="server" />
                            </td>
                        </tr>
                        <tr>
                            <th>Vehicle Brand:
                            </th>
                            <td>
                                <asp:Label ID="labelVehicleBrand" runat="server" />
                            </td>
                        </tr>
                        <tr class="price-row">
                            <th>Model:
                            </th>
                            <td>
                                <asp:Label ID="labelModel" runat="server" />
                            </td>
                        </tr>
                    </tbody>
                </table>
            </asp:PlaceHolder>
        </telerik:RadAjaxPanel>
    </div>

    <asp:SqlDataSource ID="SqlDataSource2" runat="server"
        ConnectionString="<%$ ConnectionStrings:TelerikConnectionString %>"
        SelectCommand="SELECT * FROM [Vehicles] WHERE [VehicleParentID] IS NULL"></asp:SqlDataSource>

    <asp:SqlDataSource ID="SqlDataSource1" runat="server"
        ConnectionString="<%$ ConnectionStrings:TelerikConnectionString %>"
        SelectCommand="SELECT * FROM [Vehicle_Types]"></asp:SqlDataSource>

    <asp:SqlDataSource ID="SqlDataSource3" runat="server"
        ConnectionString="<%$ ConnectionStrings:TelerikConnectionString %>"
        SelectCommand="SELECT * FROM [Vehicles] WHERE [VehicleParentID] = @VehicleID AND [VehicleTypeID] = @VehicleTypeID">
        <SelectParameters>
            <asp:ControlParameter ControlID="DropDownVehicleBrand" PropertyName="SelectedValue" Name="VehicleID" />
            <asp:ControlParameter ControlID="DropDownVehicleType" PropertyName="SelectedValue" Name="VehicleTypeID" />
        </SelectParameters>
    </asp:SqlDataSource>

    </form>
</body>
</html>

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