asp.net在GridView里用js计算文本框的值！

Question

GridView模版列代码！ <asp:TemplateField HeaderText="数量">
                                <EditItemTemplate>
                                    <asp:TextBox ID="TextBox2" runat="server" Text='<%# Bind("[T-jpcs1]") %>'></asp:TextBox>
                                </EditItemTemplate>
                                <ItemTemplate>
                                    <asp:Label ID="a" runat="server" Text='<%# Bind("[T-jpcs1]") %>'  ></asp:Label>
                                </ItemTemplate>
                            </asp:TemplateField>
 <asp:TemplateField HeaderText="单价">
                                <EditItemTemplate>
                                    <asp:TextBox ID="TextBox8" runat="server"></asp:TextBox>
                                </EditItemTemplate>
                                <ItemTemplate>
                                    <asp:TextBox ID="b" runat="server" onkeydown="checkFloat(event)" Width="100px"   ></asp:TextBox>
                                </ItemTemplate>
                            </asp:TemplateField>
  <asp:TemplateField HeaderText="总金额">
                                <EditItemTemplate>
                                    <asp:TextBox ID="TextBox10" runat="server"></asp:TextBox>
                                </EditItemTemplate>
                                <ItemTemplate>
                                    <asp:TextBox ID="c" runat="server" Width="100px" onkeydown="checkFloat(event)" ></asp:TextBox>
                                </ItemTemplate>
                            </asp:TemplateField>用js
计算数量*单价=总金额
其中数量是通过数据源绑定的~单价直接在GridView上输入，输入单价后计算结果自动显示在总金额文本框内！
求js代码！

Answer 1

    <script type="text/javascript">
        function checkFloat(e) {
            return (e.keyCode >= 48 && e.keyCode <= 57) || e.keyCode == 8 || e.keyCode == 46 || (e.keyCode >= 37 && e.keyCode <= 40) || e.keyCode == 190 || e.keyCode == 110 ? true : false;
        }        function Cal(a, tb) {
            var b = parseFloat(tb.value);
            var par = tb.parentElement || tb.parentNode;
            var tbC = par.nextSibling.getElementsByTagName("input")[0];
            tbC.value = a * b;
        }
    </script>        <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false">
            <Columns>
                <asp:TemplateField HeaderText="数量">
                    <EditItemTemplate>
                        <asp:TextBox ID="TextBox2" runat="server" Text='<%# Bind("[T-jpcs1]") %>'></asp:TextBox>
                    </EditItemTemplate>
                    <ItemTemplate>
                        <asp:Label ID="a" runat="server" Text='<%# Bind("[T-jpcs1]") %>'></asp:Label>
                    </ItemTemplate>
                </asp:TemplateField>
                <asp:TemplateField HeaderText="单价">
                    <EditItemTemplate>
                        <asp:TextBox ID="TextBox8" runat="server"></asp:TextBox>
                    </EditItemTemplate>
                    <ItemTemplate>
                        <input type="text" onkeydown="return checkFloat(event)" onkeyup="Cal(<%# Eval("[T-jpcs1]") %>,this)" style="width:100px" />
                    </ItemTemplate>
                </asp:TemplateField>
                <asp:TemplateField HeaderText="总金额">
                    <EditItemTemplate>
                        <asp:TextBox ID="TextBox10" runat="server"></asp:TextBox>
                    </EditItemTemplate>
                    <ItemTemplate>
                        <asp:TextBox ID="c" runat="server" Width="100px" onkeydown="return checkFloat(event)"></asp:TextBox>
                    </ItemTemplate>
                </asp:TemplateField>
            </Columns>
        </asp:GridView>

Answer 2

<asp:TemplateField HeaderText="数量">
                                <EditItemTemplate>
                                    <asp:TextBox ID="TextBox2" runat="server" Text='<%# Bind("[T-jpcs1]") %>'></asp:TextBox>
                                </EditItemTemplate>
                                <ItemTemplate>
                                    <asp:Label ID="a" runat="server" Text='<%# Bind("[T-jpcs1]") %>'  ></asp:Label>
                                </ItemTemplate>
                            </asp:TemplateField>
 <asp:TemplateField HeaderText="单价">
                                <EditItemTemplate>
                                    <asp:TextBox ID="TextBox8" onchange='getje()' runat="server"></asp:TextBox>
                                </EditItemTemplate>
                                <ItemTemplate>
                                    <asp:TextBox ID="b" runat="server" onkeydown="checkFloat(event)" Width="100px"   ></asp:TextBox>
                                </ItemTemplate>
                            </asp:TemplateField>
  <asp:TemplateField HeaderText="总金额">
                                <EditItemTemplate>
                                    <asp:TextBox ID="TextBox10" runat="server"></asp:TextBox>
                                </EditItemTemplate>
                                <ItemTemplate>
                                    <asp:TextBox ID="c" runat="server" Width="100px" onkeydown="checkFloat(event)" ></asp:TextBox>
                                </ItemTemplate>
                            </asp:TemplateField>
<script language='javascript'>
   function getje()
   {
       var djobj=window.event.srcElement;//获取事件源
        var trobj=djobj.parentNodes.parentNodes;
       var slobj=trobj.childNodes[0].childNodes[0];(第一个[0]数量列在表格中的位置）
        var jeobj=trobj.childNodes[2].childNodes[0];       jeobj.value=djobj.value*slobj.value;   }
</script>
我没时间试，大概就是这个意思