JS文件里获取服务控件ID

你不是都知道是用getElementById了吗？document.getElementById("你的RadioButtonListid").value就是所选中某一项的值

解决方案 »

  1.   

    .NET的做法：
    <%@ Page language="c#" Codebehind="WebForm1.aspx.cs" AutoEventWireup="false" Inherits="ajaxselect.OnmouseTitle.WebForm1" %>
    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
    <HTML>
        <HEAD>
            <title>WebForm1</title>
            <meta content="Microsoft Visual Studio .NET 7.1" name="GENERATOR">
            <meta content="C#" name="CODE_LANGUAGE">
            <meta content="JavaScript" name="vs_defaultClientScript">
            <meta content="http://schemas.microsoft.com/intellisense/ie5" name="vs_targetSchema">
            <script language="javascript">
            
                   function  getvalue()
            {
            var b=document.all.rbtid.length
            var a=document.getElementById("rbtid").rows.length; 
            //alert(b);结果为5
            //alert(a);结果为4
            //for(var i=0;i<b-1;i++)这样也行
            for(var i=0;i<a;i++)
            {
              var ss="rbtid_"+i;
              var aa=document.getElementById(ss).value;
              //if(eval('document.all.rbtid_'+i).checked==true) //这样也行 eval()函数能将数据符串转成js运行
              var bb=document.getElementById(ss);
              if(document.getElementById(ss).checked)  //注意checked不能写成Checked，要不然不成功
               {
                      alert(aa);
                      break;
               }      
            
            }
            }
            </script>
        </HEAD>
        <body MS_POSITIONING="GridLayout">
            <form id="Form1" method="post" runat="server">
                <FONT face="宋体">
                    <asp:radiobuttonlist id="rbtid" style="Z-INDEX: 101; LEFT: 8px; POSITION: absolute; TOP: 8px" runat="server"
                        Width="216px" Height="176px" name="rbtid">
                        <asp:ListItem Value="0">0</asp:ListItem>
                        <asp:ListItem Value="1" Selected>1</asp:ListItem>
                        <asp:ListItem Value="2">2</asp:ListItem>
                        <asp:ListItem Value="3">3</asp:ListItem>
                    </asp:radiobuttonlist><INPUT style="Z-INDEX: 102; LEFT: 184px; POSITION: absolute; TOP: 256px" onclick="getvalue()"
                        type="button" value="Button"></FONT>
            </form>
        </body>
    </HTML>