Js 操作radiobuttonlist的方法

方法一:

          ‍ function getvalue()
        {
          var b=document.all.rbtid.length
         var a=document.getElementById("rbtid").cells.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;
           }     
       
        }
        }

 

 

方法二:

       var vRbtid=document.getElementById("rbtid");
      //得到所有radio
      var vRbtidList= vRbtid.getElementsByTagName("INPUT");
      for(var i = 0;i<vRbtidList.length;i++)
      {
        if(vRbtidList[i].checked)
        {
           var text =vRbtid.cells[i].innerText;
           var value=vRbtidList[i].value;
           alert("选中项的text值为"+text+",value值为"+value);
        }
      }

‍此方法中,RadioButtonList在客户端被看成成了table,通过getElementsByTagName("INPUT")方法获取它的所有子radio,然后循环每个radio,再通过cells获取radio的text值。

‍<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>

--------------------------------------------------------------------------------------------------------测试

‍<script language="javascript" type="text/javascript">
        function test()
        {
            var rb=document.getElementById("rbporperty");
            var rblist=rb.getElementsByTagName("INPUT");
            var tag=0;
            for(var i=0;i<rblist.length;i++)
            {
                if(rblist[i].checked==false)
                {
                    //alert("items "+i+"is checked text is"+rb.cells[i].innerText);
                    tag+=1;
                }
//                else
//                {
//                    alert("null checked");
//                }
               
            }
           
            if(tag==rblist.length)
            {
                alert("no checked");
            }
            else
            {
                alert("checked!");
            }
           
        }
    </script>

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