在GridView中用Js实现全选

  有的时候，在GridView要用的CheckBox，并且，还有一个实现全选的CheckBox，所以我在下面把js代码贴在下面，

<script language=javascript>
function Sel()
{
oEl = event.srcElement;

for(i = 0;i < document.all.length; i++)
{
                                              // datagrid将生成层次名+id作为客户端id
if(document.all(i).id.indexOf("你的CheckBox的ID") != -1)
{
if(oEl.checked)
document.all(i).checked = true;
else
document.all(i).checked = false;
}
}
}
</script>

下面是GirdView代码

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" OnRowDataBound="GridView1_RowDataBound">
                                        <Columns>
                                            <asp:BoundField DataField="pid" HeaderText="Id" />
<!--关键是这段代码-->
                                            <asp:TemplateField>
                                            <HeaderTemplate>
                                             <input id="chkAll" onclick="Sel()"  type="checkbox" />

                                            </HeaderTemplate>
                                                <ItemTemplate>
                                                    <asp:CheckBox ID="cbselect" runat="server" />
                                                </ItemTemplate>
                                            </asp:TemplateField>

<!--关键是这段代码-->
                                            <asp:TemplateField HeaderText="商品名称">
                                                <ItemTemplate>
                                                <a href='DetailProduceInfo.aspx?pid=<%#Eval("pid") %>' target="_blank"><%#Eval("pname") %></a>    
                                                </ItemTemplate>
                                            </asp:TemplateField>
                                            <asp:TemplateField HeaderText="单价">
                                                <ItemTemplate>
                                                      <%#Eval("pmoney") %>
                                                </ItemTemplate>
                                            </asp:TemplateField>
                                            <asp:TemplateField HeaderText="数量">
                                                <ItemTemplate>
                                                    <asp:TextBox ID="txtquantity" runat="server" Width="80px">0</asp:TextBox>
                                                    <asp:RegularExpressionValidator ID="RegularExpressionValidator1" runat="server" ControlToValidate="txtquantity"
                                                        ErrorMessage="请你输入数字！" ValidationExpression="^[0-9]{1,}$"></asp:RegularExpressionValidator>
                                                </ItemTemplate>
                                            </asp:TemplateField>
                                        </Columns>
                                    </asp:GridView>