Find row index inside girdview row click on checkbox using jquery

//////////////////////// HTML

<asp:GridView runat="server" ID="grdclaimdetails">

            <Columns>

                <asp:TemplateField>

                    <ItemTemplate>

                        <asp:CheckBox runat="server" ID="Personal" onclick="return getRowIndexVal(this);" />

                    </ItemTemplate>

                </asp:TemplateField>

            </Columns>

        </asp:GridView>

/////////////////////////js

  <script>

        function getRowIndexVal(Personal) {

            var rc = $('[id$=hdnrc]').val();

            var op1 = $(Personal).attr("id");

            var row = Personal.parentNode.parentNode.parentNode;

            var i = row.rowIndex; //  - 1;

            $('[id$=grdclaimdetails] tr').eq(i + 1).find("td").eq(7).find("input:text[id$=txtcperdiemamt]").val(pval);//value of textbox at cell 7

        }

    </script>