请问在JS中怎么判断RadioButtonList是否选中了其中的一项
比如:
<asp:RadioButtonList runat="server" ID="rdoDiscount" RepeatLayout="Flow" RepeatDirection="Horizontal">
<asp:ListItem Selected="True" Value="1">折扣</asp:ListItem>
<asp:ListItem Value="2">价格</asp:ListItem>
</asp:RadioButtonList>
用IS判断选择的是:折扣 还是 :价格
怎么判断?
------解决方案--------------------
- HTML code
<asp:RadioButtonList runat="server" ID="rdoDiscount" RepeatLayout="Flow" RepeatDirection="Horizontal"> <asp:ListItem Value="1">折扣 </asp:ListItem> <asp:ListItem Value="2">价格 </asp:ListItem> </asp:RadioButtonList> <input type="button" onclick="haveChecked()?alert('已选择'):alert('未选择');" value="check" /> <script type="text/javascript"> function haveChecked() { var rbl=document.getElementById('<%=rdoDiscount.ClientID %>'); var rbls=rbl.getElementsByTagName('input'); for(var i=0;i<rbls.length;i++) { if(rbls[i].type=='radio') if(rbls[i].checked) return true; } return false; } </script>
------解决方案--------------------
改进一下
- HTML code
<asp:RadioButtonList runat="server" ID="rdoDiscount" RepeatLayout="Flow" RepeatDirection="Horizontal"> <asp:ListItem Value="1">折扣 </asp:ListItem> <asp:ListItem Value="2">价格 </asp:ListItem> </asp:RadioButtonList> <input type