根据下拉框动态改变联动的状态

根据第一个下拉框的选择，动态改变第二个是文本框还是下拉框；

<li>
                        <div class="left">报修条件：</div>
                        <div class="right">
                            <select class="checkarea" id="param_type" name="param_type" onchange="cardChange()" placeholder="客户证号" maxlength="32">
                                <option value="customerCode">客户证号</option>
<!--                                 <option value="serialNo">机顶盒号</option> -->
                                <option value="icCard">智能卡号</option>
                            </select>
                        </div>
                    </li>
                    <li>
                        <div class="left"><span>*</span>报修证号：</div>
                        <div class="right" id="textId" style="display: block">
                            <input type="text" class="checkarea" id="param_value" data-name="param_value" maxlength="32" readonly="readonly" value="<%=customercode%>">
                        </div>
                    </li>

根据报修条件的下拉框选择值，改变报修证号的状态；给下拉框绑定一个事件cardChange()

function cardChange(){
        //获取报修条件下拉框的value值
        var selVal = $("#param_type").val();
        var openId = "<%=openId%>";
        var corpId = "<%=area_id%>";
        var customercode = "<%=customercode%>";
        $.ajax({
            url:'getCardId.jspx?openId='+openId+'&corpId='+corpId,
            data:[],
               type:'POST',
            timeout:50000,
            contentType:'application/www-form-urlencoded;charset=utf-8',
            success:function (data){
                if(data != ''){
                    var jsonDa = eval('('+data+')')
                    //清空
                    $("#textId").empty();
                    //选择的值
                    if(selVal == "customerCode") {
                        //选择客户证号
                        $("#textId").append("<input type='text' class='checkarea' id='param_value' data-name='param_value' maxlength='32' readonly='readonly' value='" + customercode + "'>");
                    } else if(selVal == "icCard") {
                        //选择智能卡号
                        //根据id加入元素
                        var selectHtml = "<select class='checkarea' id='param_value' name='param_value'>";
                        for(var i = 0; i < jsonDa.length; i ++){
                            var map = jsonDa[i];
                             selectHtml += "<option value='"+ map.CARDNO +"'>" + map.CARDNO + "</option>";
                        }
                        selectHtml += "</select>";
                        $("#textId").append(selectHtml);
                    }
                }
            }
        })
        
    }