JQuery获取Checkbox组的值

前台：

     <div id="addtrtr" style="padding:20px; background-color:#F8F8F8;">
     <table id="mytable" style="background-color:#F8F8F8; 100%; padding:10px;">
     <tr>
     <td width="8%"><asp:DropDownList ID="DropCivil" runat="server" Width="100%" Height="24">
        <asp:ListItem>土建项目部</asp:ListItem>
    </asp:DropDownList></td>
    <td width="8%"><asp:DropDownList ID="DropName" runat="server" Width="100%" Height="24">
        <asp:ListItem>项目部名称</asp:ListItem>
    </asp:DropDownList></td>
    <td>
        <input id="dt1" type="checkbox" name="newsletter" value="单体工程名称1" /><label for="dt1">单体工程名称1</label>
        <input id="dt2" type="checkbox" name="newsletter" value="单体工程名称2" /><label for="dt2">单体工程名称2</label>
        <input id="dt3" type="checkbox" name="newsletter" value="单体工程名称3" /><label for="dt3">单体工程名称3</label>
        <input id="dt4" type="checkbox" name="newsletter" value="单体工程名称4" /><label for="dt4">单体工程名称4</label>
    </td>

     <td width="6%"><asp:Button ID="Button1" runat="server" CssClass="submit" Text="修改" /></td>
    <td width="6%"><asp:Button ID="Button2" runat="server" CssClass="submit" Text="删除" /></td>
    </tr>
    </table>
    <input id="addtr" name="AddNext" type="button" value="添加一行" class="keyword required" />

 点击文字选中checkbox：文字必须是label标签内,checkbox的id和<label>标签内的for=""中的名字必须相同

JQuery代码：

<script type="text/javascript">
    $(document).ready(function () {
        $("input[name=AddNext]").click(function () {
            var civil = $("#<%=DropCivil.ClientID%> option:selected").text().toString();
            var projectname = $("#<%=DropName.ClientID%> option:selected").text().toString();
            var str;
            $("input:checked").each(function (i) {         //循环拼装被选中项的值  
                str += $(this).val() + ',';
            });


            if (civil != "" && projectname != "") {
                var sb = "<div>";
                sb += "<input type='text' name='DropCivil'  size='10' value='" + civil + "' Class='keyword' ReadOnly='false'/>&nbsp;";
                sb += "<input type='text' name='DropName' size='10' value='" + projectname + "' Class='keyword' ReadOnly='false' />&nbsp;";
                sb += "<input type='text' name='MonomerName' size='50' value='" + str.substr(9) + "' Class='keyword' ReadOnly='false' />&nbsp;";
                sb += "</div>";
                $('#addtrtr').append(sb);

            }
            else {
                alert("信息不能为空！");
            }
        });
    });
        function AddPrediction_getDel(k) {
            $(k).parent().remove();
        }
</script>

效果：