easy ui给元素增加属性

我用easy ui做的后台系统，当我想用以下的语句给select元素增加disabled属性时，发现属性加上去了，但不生效：

这是在js中的代码：
                                 $('#planInnerGerberPeopleEdit').attr('disabled',true); 
$('#PlanToolRectverNo_fledit').form('load', {

idPlanToolRectverNo_flEdit : obj.rows[0].id,
PlanToolRectverNo_timeflEdit : rows[0].dateTimex, 
PlanToolRectverNo_jobsflEdit : obj.rows[0].jobName,
planRegisterflEdit : obj.rows[0].register,

planChangeReasonflEdit : obj.rows[0].changeReason,
planProcessflEdit : obj.rows[0].inventoryProcess,

planInnerGerberEdit : obj.rows[0].innerGerber,
planOutGerberEdit : obj.rows[0].outGerber,
planTsGerberEdit : obj.rows[0].tsGerber,
planToGerberEdit : obj.rows[0].toGerber,
planOtherGerberEdit : obj.rows[0].otherGerber,

planInnerGerberPeopleEdit : obj.rows[0].rectverInner,
planInnerGerberTimeEdit : obj.rows[0].innerTime,
planOutGerberPeopleEdit : obj.rows[0].rectverOut,
planOutGerberTimeEdit : obj.rows[0].outTime,
planTsGerberPeopleEdit : obj.rows[0].rectverTs,
planTsGerberTimeEdit : obj.rows[0].tsTime,
planToGerberPeopleEdit : obj.rows[0].rectverTo,
planToGerberTimeEdit : obj.rows[0].toTime,
planOtherGerberPeopleEdit : obj.rows[0].rectverOther,
planOtherGerberTimeEdit : obj.rows[0].otherTime,

planRectverFlEdit : obj.rows[0].rectverFl,
planflTime : obj.rows[0].flTime

}).dialog('open');


这里html中dialog的代码:
                              &nbsp    <label>内层回收人:&nbsp</label> 
              <c:if test="${DepartmentPe == 'FL'}">
               <select id="planInnerGerberPeopleEdit" name="planInnerGerberPeopleEdit"
class="easyui-combobox"  panelHeight="auto"   style="width: 105px">
<option value=${makeName}>${makeName}</option>

运行效果如下：