Update Comboboxes 2+3 from change in ComboBox 1

[Guillermo]

I have a page with with various input fields and  3 RadComboBox's. They are pre-populated with data  in the .cs code page

I want to modify the page so that when the user changes the first RadComboBox, the other 2 are updated based on the selection made in the first.   Any help.

.aspx.ca  code

//Page event, raised on page load
protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
     //Code pre-populated here. no problems.
}

.aspx page code

<tr runat="server" id="Tr1">
            <td style="width: 120px;">Your PI/Approver
                <asp:CompareValidator ID="piCompareValidator" runat="server" Text="*" ControlToValidate="piRadComboBox1" ValueToCompare="Select One..." Operator="NotEqual" ErrorMessage="Please select your P.I. in the 'Order Preferences' section"></asp:CompareValidator>
            </td>
            <td>
                <telerik:RadComboBox ID="piRadComboBox1" Skin="Gray" Height="300px"
                    Width="202px" DataTextField="ListName" DataValueField="UserName" AppendDataBoundItems="true" EnableTextSelection="false" runat="server">
                    <items>
                        <telerik:RadComboBoxItem Text="Select One..." Value="Select One..." />
                    </items>
                </telerik:RadComboBox>
                 <a href="#" rel="1" title="This order requires multiple approvers, add another." class="bdrLink jAdd">+ Add another PI/Approver</a> </td>
    </tr>
    <tr runat="server" id="Tr2">
            <td>Your Approver</td>
            <td>
                <telerik:RadComboBox ID="piRadComboBox2" Skin="Gray" Height="300px" Width="202px" DataTextField="ListName" DataValueField="UserName" AppendDataBoundItems="true" EnableTextSelection="false" runat="server">
                    <items>
                        <telerik:RadComboBoxItem Text="Select One..." Value="Select One..." />
                    </items>
                </telerik:RadComboBox>

                 <a href="#" rel="2" class="jRemove bdrLink">Remove</a> </td>
    </tr>
        <tr class="alt">
            <td style="width: 120px;">Your Purchaser </td>
            <td>
                <telerik:RadComboBox ID="purchaserRadComboBox" Skin="Gray" Width="202px" DataTextField="ListName" DataValueField="UserName" AppendDataBoundItems="true" EnableTextSelection="false" runat="server">
                    <items>
                        <telerik:RadComboBoxItem Text="Select One..." Value="Select One..." />
                    </items>
                </telerik:RadComboBox>
                <asp:CompareValidator ID="purchaserCompareValidator" runat="server" Text="*" ControlToValidate="purchaserRadComboBox" ValueToCompare="Select One..." Operator="NotEqual" ErrorMessage="Please select your purchaser in the 'Order Preferences' section"></asp:CompareValidator>
            </td>
        </tr>

[Guillermo]

figured it out with javascript.  now im just trying to figure it out how to do it with ajax so the page doesnt refresh

[Yana]

Hi Guillermo,

Have you checked our online example which demonstrates related ComboBoxes?

Best wishes,
Yana
the Telerik team