combobox dropdown does not open with OnClientSelectedIndexChanged method

[vishesh kumar]

Hi,

I have a rad combobox and i need to make a textbox as a required field if a particular item was selected in the combobox.

I have the following code:

<td valign="top" style="font-weight: normal" class="ms-formbody">
                <%-- <asp:DropDownList ID="ddlReferralSource" runat="server" Width="132">
                </asp:DropDownList>--%>
                <telerik:RadComboBox runat="server" ID="radComboReferralSource" AllowCustomText="false"
                    EnableLoadOnDemand="false" MarkFirstMatch="true" OnClientSelectedIndexChanged="ValidateHearAboutUsSource" >
                </telerik:RadComboBox>
                <asp:RequiredFieldValidator runat="server" ID="RequiredFieldValidator2" ControlToValidate="radComboReferralSource"
                    Display="Dynamic" SetFocusOnError="true" ErrorMessage="<%$Resources:CareerResources, Career_RequiredField%>"
                    ValidationGroup="profile" InitialValue="<%$Resources:CareerResources, Career_SelectText%>"></asp:RequiredFieldValidator>
            </td>
            <td>
                <asp:TextBox runat="server" ID="txtHearAboutUsSourceValue"></asp:TextBox>
                 <asp:RequiredFieldValidator runat="server" ID="rfvHearAboutUsSourceValue" ControlToValidate="txtHearAboutUsSourceValue"
                    Display="Dynamic" SetFocusOnError="true" ErrorMessage="<%$Resources:CareerResources, Career_RequiredField%>"
                    ValidationGroup="profile" ></asp:RequiredFieldValidator>
            </td>

as soon as i add the OnClientSelectedIndexChanged attribute, the dropdown doesnt even open on the page.

so i have two questions:

1. How to solve the problem with dropdown in the rad combobox?
2. How to force client side validation for a particular textbox if a particular value is selected in the radcombobox?

Update: I am now able to view the dropdown values but they are not triggering the ValidateHearAboutUsSource function.

<script type="text/javascript" language="javascript">
        function ValidateHearAboutUsSource(item, eventArgs) {
alert("test");
        var item1 = eventArgs.get_item();
        alert("You selected " + item1.get_text());
            var dropdownvalue = item.value;
            alert(dropdownvalue);
            var textBoxItem = document.getElementById('<%=txtHearAboutUsSourceValue.ClientID%>'
            var validator = document.getElementById('<%=rfvHearAboutUsSourceValue.ClientID%>');
        }
    </script>

Thanks

Vishesh