js 此为核心代码
$(document).ready(function(){
???????$("#carTypeId").attr("value",‘${carInfo.carTypeId}‘); //后台传递的值
????}) ?
<tr>
<th width="20%">车辆种类名称: </th>
<td>
<%-- <input type="text" id="carTypeId" name="carTypeId" value="${carInfo.carTypeId}" ?class="inputText" validate="{required:false,number:true,maxIntLen:10}" ?/>
--%>
<select name="carTypeId" id ="carTypeId" ?class="select panel-search-inputText">
<option value="">--选择--</option>
<c:forEach items="${listCarType}" var="keyword" varStatus="id">
????????????<option value="${keyword.id}" ??<c:if test="${keyword.id} == ${carInfo.carTypeId}">selected</c:if>> ??${keyword.typeName}</option>
</c:forEach>
</select>
</td>
java 代码
List<CarType> listCarType=carTypeService.getAll();
return getAutoView().addObject("carInfo",carInfo !=null?carInfo:null)
???????????.addObject("listCarType", listCarType)
JQuery select 编程时选中原有的值
原文地址：https://www.cnblogs.com/1880su/p/10172159.html