请问js给gridview中textbox赋值的有关问题

请教js给gridview中textbox赋值的问题
请教我目前是一个动态自增行的gridview，第一列是一个textbox和一个linkbutton
点击linkbutton弹出一个窗口选择姓名，然后把所选的姓名返回到 textbox中
可是前台js无法给gridview中的textbox赋值找不到textbox控件

部分代码如下

HTML code

<asp:GridView ID="GridView1" runat="server" AllowPaging="True" AllowSorting="True"
    AutoGenerateColumns="False" BackColor="#4D77B1" BorderColor="#4D77B1" BorderStyle="None"
    BorderWidth="1px" CellPadding="3" CellSpacing="1" GridLines="None" PageSize="12"
    Style="font-size: 12px" Width="100%" OnPreRender="GridView1_PreRender" 
        onrowdatabound="GridView1_RowDataBound" >
    <PagerSettings Visible="False" />
    <FooterStyle BackColor="#C6C3C6" ForeColor="Black" />
    <Columns>
            <asp:TemplateField HeaderText="参会人员">
            <ItemTemplate><asp:TextBox ID="Realname" runat="server"  Width="70%" Height="26px"></asp:TextBox><A href="javascript:void(0)"><IMG onclick="openuser1();" alt="" src=
            "../images/FDJ.gif" border="0"></A>
            <%--<asp:DropDownList runat="server" ID="Realname" DataSourceID="SqlDataSource1" 
                    DataTextField="Realname" DataValueField="Username" Width="98%" 
                    onselectedindexchanged="Realname_SelectedIndexChanged" >
            <asp:ListItem>——请选择——</asp:ListItem>
            </asp:DropDownList>
       
                <asp:SqlDataSource ID="SqlDataSource1" runat="server" 
                    ConnectionString="<%$ ConnectionStrings:qpoaConnectionString6 %>" 
                    SelectCommand="SELECT [Username], [Realname] FROM [qp_username]"></asp:SqlDataSource>--%>
       
            </ItemTemplate>
            <ItemStyle Width="150px" Wrap="False" HorizontalAlign="Center" />
        </asp:TemplateField>
                                            
                                            
                                            
          <asp:TemplateField HeaderText="负责工作">
            <ItemTemplate>
            <asp:DropDownList runat="server" ID="mettingSX" DataSourceID="SqlDataSource2" 
                    DataTextField="mettingSX" DataValueField="mettingSX" Width="98%">
            <asp:ListItem Value="——请选择——">——请选择——</asp:ListItem>
            </asp:DropDownList>
       
                <asp:SqlDataSource ID="SqlDataSource2" runat="server" 
                    ConnectionString="<%$ ConnectionStrings:qpoaConnectionString7 %>" 
                    SelectCommand="SELECT [mettingSX] FROM [mettingAP]"></asp:SqlDataSource>
       
            </ItemTemplate>
            <ItemStyle Width="450px" Wrap="False" HorizontalAlign="Center" />
        </asp:TemplateField>
                                        
        <asp:TemplateField HeaderText="完成时限">
            <ItemTemplate>
            <asp:TextBox ID="endtime" Width="100%" runat="server" Text='<%# DataBinder.Eval(Container,"DataItem.endtime") %>'
                    onclick="setDayHM(this);"></asp:TextBox>
            </ItemTemplate>
            <ItemStyle Width="130px" Wrap="False" HorizontalAlign="Center" />
        </asp:TemplateField>
                                        
        <asp:TemplateField HeaderText="添加">
            <ItemTemplate>
                <asp:Button ID="btnAdd" runat="server" Text="添加" OnClick="btnAdd_Click" />
                <asp:Button ID="btnHiddenClick" runat="server" Text="Add" Style="display: none" mce_Style="display: none"
                    OnClick="btnHiddenClick_Click" />
            </ItemTemplate>
            <ItemStyle Width="40px" Wrap="False" HorizontalAlign="Center" />
        </asp:TemplateField>
    </Columns>
    <RowStyle BackColor="#FBFCFE" ForeColor="Black" />
    <SelectedRowStyle BackColor="#9471DE" Font-Bold="True" ForeColor="White" />
    <PagerStyle BackColor="#C6C3C6" ForeColor="Black" HorizontalAlign="Right" />
    <HeaderStyle BackColor="#4A3C8C" Font-Bold="True" ForeColor="#E7E7FF" Wrap="False" />
    <AlternatingRowStyle BackColor="#E6EDF7" />
    <EmptyDataTemplate>
        <div align="center">
            <font color="white">无相关数据！</font></div>
    </EmptyDataTemplate>
</asp:GridView>

请问js给gridview中textbox赋值的有关问题

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