jquery判断RadioButtonList和RadioButton中是否有选中项示例_jquery

 <%--Body 代码--%> <BR><div> <BR><asp:RadioButtonList ID="RadioButtonList1" runat="server"> <BR><asp:ListItem Value="A">a</asp:ListItem> <BR><asp:ListItem Value="B">b</asp:ListItem> <BR></asp:RadioButtonList> <br><br><asp:RadioButton ID="RadioButton1" GroupName="RBtn" Text="男" runat="server" Checked="true" /> <BR><asp:RadioButton ID="RadioButton2" GroupName="RBtn" Text="女" runat="server" /> <br><br><asp:Button ID="Button1" runat="server" Text="Button" OnClientClick="Button1_ClientClick()"></asp:Button> <BR></div>

<%--Head 代码--%> <BR><script language="javascript" type="text/javascript" src="js/jquery-1.9.1.js"></script> <BR><script language="javascript" type="text/javascript"> <br><br>function Button1_ClientClick() <BR>{ <BR>alert($("input[name='RadioButtonList1']:checked").val()); // 若都没有选中，则弹出“undefined”，若有选中的，则弹出对应的 Value 值 <BR>if(document.getElementById("RadioButton1").checked==true) // 若RadioButton1被选中 <BR>{ <BR>alert($("#RadioButton1:checked").val()); //弹出 RadioButton1 <BR>alert($("#RadioButton2:checked").val()); //弹出 undefined <BR>alert($("#RadioButton1:checked").val()=="RadioButton1"); //弹出 true <BR>} <BR>return false; //暂时不用传到后台 <BR>} <BR></script> <BR>