jQuery validate 验证radio实例

<div class="row cl"> 
  <label class="form-label col-xs-4 col-sm-3"><span class="c-red">*</span>优惠券类型：</label> 
  <div class="formcontrols col-xs-8 col-sm-9 skin-minimal"> 
    <div class="radio-box"> 
      <input name="coupontype" type="radio" value="1" id="coupontype_1" <#if couponinfo.coupontype == 1>checked</#if>> 
      <label for="coupontype_1">满减券</label> 
    </div> 
    <div class="radio-box"> 
      <input type="radio" name="coupontype" value="2" id="coupontype_2" <#if couponinfo.coupontype == 2>checked</#if>> 
      <label for="coupontype_2">折扣券</label> 
    </div> 
    <div class="radio-box"> 
      <input type="radio" name="coupontype" value="3" id="coupontype_3" <#if couponinfo.coupontype == 3>checked</#if>> 
      <label for="coupontype_3">现金券</label> 
    </div> 
  <label id="coupontype-error" for="coupontype" class="error"></label> 
  </div> 
</div> 
<div class="row cl" id="couponmax_div"> 
  <label class="form-label col-xs-4 col-sm-3">优惠最高金额：</label> 
  <div class="formcontrols col-xs-8 col-sm-9"> 
    <input type="text" class="input-text" placeholder="仅在折扣券的情况下填写" name="couponmax" id="couponmax" value="${couponinfo.couponmax}"> 
  </div> 
</div> 

$("#form-member-add").validate({ 
  rules:{ 
    sendcoupontype:{ 
      required:true 
    }, 
    platformid:{ 
      required:true 
    }, 
    coupontype:{ 
      required:true 
    } 
  }, 
  onkeyup:false, 
  focuscleanup:true, 
  success:"valid", 
  submithandler:function(form){ 
    var couponinfo = getcouponparameter(); 
    savecouponinfo(couponinfo); 
  } 
}); 
function savecouponinfo(couponinfo){ 
  $.ajax({ 
    type:'post', 
    url: "/coupon/save", 
    data: { 
      couponstr:couponinfo 
    }, 
    async: false, 
    success: function(data){ 
      if(data.code == 200){ 
        var index = parent.layer.getframeindex(window.name); 
        parent.$('#btn_search').click(); 
        parent.layer.close(index); 
      }else layer.alert("操作失败"); 
    } 
  });  
} 
// 获取优惠券表单值 
var getcouponparameter = function(){ 
  var couponinfo = {}; 
  couponinfo.id = couponid; 
  //优惠券活动名称 
  couponinfo.couponname = $('#couponname').val(); 
  //使用范围 
  couponinfo.couponusingrange = $("input[name='couponusingrange']:checked").val(); 
  //发放类型 
  couponinfo.sendcoupontype = $("input[name='sendcoupontype']:checked").val(); 
  //使用平台 
  couponinfo.platformid = $("input[name='platformid']:checked").val(); 
  //优惠券类型 
  couponinfo.coupontype = $("input[name='coupontype']:checked").val(); 
  //优惠券使用限制 
  couponinfo.meetprice = $('#meetprice').val(); 
  //优惠券面额 
  couponinfo.couponamount = $('#couponamount').val(); 
  //活动起始时间 
  couponinfo.couponstartdate = $('#couponstartdate').val(); 
  //活动结束时间 
  couponinfo.couponenddate = $('#couponenddate').val(); 
  //优惠券数量 
  couponinfo.couponnum = $('#couponnum').val(); 
  //用户领取优惠券数量限制 
  couponinfo.limitgetnum = $('#limitgetnum').val(); 
  //备注 
  couponinfo.remark = $('#remark').val(); 
  return json.stringify(couponinfo); 
} 
$("input:radio[name='coupontype']").click(function(){ 
  //1.满减券   2.折扣券    3.现金券 
  var tt = $(this).val(); 
  switch(tt){ 
    case '1' : 
      $('#couponmax_div').hide(); 
      break; 
    case '2' : 
      $('#couponmax_div').show(); 
      break; 
    case '3' : 
      $('#couponmax_div').hide(); 
      break; 
    default: 
      break; 
  } 
});