求教：在textbox中获取checkbox值

Question

<asp:TextBox ID="txtPersons" runat="server" CssClass="textarea wh380 required "></asp:TextBox>
<asp:Repeater ID="Repeater1" runat="server" OnItemDataBound="Repeater1_ItemDataBound">
            <ItemTemplate>
                <ul>
                    <li>
                        <%#Eval("DepId")%>
                        <%#Eval("Name")%></li></ul>
                <asp:Repeater ID="Repeater2" runat="server">
                    <ItemTemplate>
                        <asp:CheckBox ID="cb" runat="server" Text='<%#Eval("RealName")%>' />
                        <asp:HiddenField ID="hidId" Value='<%#Eval("UserId")%>' runat="server" />                        
                    </ItemTemplate>
                </asp:Repeater>
            </ItemTemplate>
        </asp:Repeater>
如何将选中的值赋值到asp:TextBox 中？
我用.net提交方法传参实现不了，一提交就会导致别的textbox值清空，只能求教客户端代码了，又写不好，哪位帮忙写下，谢谢了！

Answer 1

js给C#控件赋值

Answer 2

            function setText(ID, v,checked) {
                var txt = document.getElementById(ID), vs = txt.value;
                if (checked) vs += (vs == '' ? ',' : '') + v + ',';
                else vs = vs.replace(',' + v + ',', ',');
                txt.value = vs;
            }
<asp:CheckBox ID="cb" runat="server" Text='<%#Eval("RealName")%>'  onclick="setText('<%#txtPersons.ClientID%>',this.nextSibling.innerHTML,this.checked)"/>

Answer 3

var cks=  $(input[id^='checkbox的ID'])  这里是多个checkbox
做个循环   for(var i=0;i<cks.length;i++)
做个判断   if($(cks[i]).attr("checked")==true)
再赋值给textbox就可以了