JqueryGridview模板列求和

gridview中模板列TextBox求和赋值给一个TextBox(txt总维修金额)

html：

<Chsoft:SmartGridView ID="gv设备_外协维修合同明细" runat="server" Width="100%" IsShowIndexColumn="true" DataKeyNames="外协维修合同明细ID" AllowPaging="false"
            IsShowExcelLinkButton="false" IsSinglePageDataMode="False"
                                        UnExportColumns="操作">
                                        <Columns>
                                            <asp:TemplateField HeaderText="材料费用">
                                                <ItemStyle HorizontalAlign="Right" Width="80px" />
                                                <ItemTemplate>
                                                    <Chsoft:SmartNumericTextBox ID="txt材料费用" DecimalSeparator="Dot" IsAllowDecimals="true"
                                                        Width="60px" runat="server" MaxLength="10" CssClass="class材料费用" IsAllowNegative="false"></Chsoft:SmartNumericTextBox>
                                                </ItemTemplate>
                                            </asp:TemplateField>
                                            <asp:TemplateField HeaderText="人工费用">
                                                <ItemStyle HorizontalAlign="Right" Width="80px" />
                                                <ItemTemplate>
                                                    <Chsoft:SmartNumericTextBox ID="txt人工费用" DecimalSeparator="Dot" IsAllowDecimals="true"
                                                        Width="60px" runat="server" MaxLength="10" CssClass="class人工费用" IsAllowNegative="false"></Chsoft:SmartNumericTextBox>
                                                </ItemTemplate>
                                            </asp:TemplateField>
                                        </Columns>
                                    </Chsoft:SmartGridView>

JsCode:

<script language="javascript" type="text/javascript">
                Sys.Application.add_load(function () {
                    var classDiscount = $("#<%=gv设备_外协维修合同明细.ClientID %>").contents().find(".class材料费用");
                    classDiscount.keyup(function () {
                        ChangeText($(this));
                    });
                    var classDiscount = $("#<%=gv设备_外协维修合同明细.ClientID %>").contents().find(".class人工费用");
                    classDiscount.keyup(function () {
                        ChangeText($(this));
                    });
                    function ChangeText(target) {
                        var txt总维修金额 = $("#<%=txt总维修金额.ClientID %>");
                        if (target.val() != "0") {
                            var con = $("#<% =gv设备_外协维修合同明细.ClientID %> :text");
                            var count = 0;
                            for (var i = 0; i < con.length; i++) {
                                count = Number(count) + Number(con[i].value);
                            }
                            txt总维修金额.val(count);
                        }
                    }
                });
            </script>