How do I set value for the radio button list using javascript which is in ascx page

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C#

ASP.NET

Javascript

In Ascx Page

<asp:RadioButtonList ID="rdbSelectionMethod" runat="server" RepeatDirection="Horizontal" AutoPostBack="true"
                               RepeatLayout="Flow" OnSelectedIndexChanged="rdbSelectionMethod_SelectedIndexChanged">
                                <asp:ListItem Selected="True" Value="I">List of Materials</asp:ListItem>
                                <asp:ListItem Value="R">Range of Materials</asp:ListItem>
                           </asp:RadioButtonList>

In webAspx Page

<%@ Register Src="~/EIPCommonControls/EIPRangeCart.ascx" TagName="MaterialCart" TagPrefix="uc5" %>

function ConfirmMessageMat() {
            var dis = confirm("Do You Want To Clear List Of Materials?");

            if (dis) {

                //document.getElementsByName("hidecart()");
                document.getElementById('<%=grvMatGrp.ClientID%>').outerHTML = "";
                document.getElementById('<%=hdnMaterialcart.ClientID%>').value="Yes";
            }
            else {
                //document.getElementById('<%=hdnMaterialcart.ClientID%>').value = "";
                document.getElementById('<%=MaterialCart1.FindControl("rdbSelectionMethod").ClientID%>');

                document.getElementById('<%=hdnMaterialcart.ClientID%>').value = "No";
            }

        }