<select id="select" name="rawfoodBasic.category" onchange="doChange(this.value);"> //第一个下拉框里的值 </select>

<select id="subSelect" name="rawfoodBasic.absorb" onchange="javascript:alert(this.value);" > //要3及菜单还可以在次写相应的时间 <option value="0">--请选择二级菜单-- </option> </select>

<script type="text/javascript"> $.ajaxSetup({ cache:false }); //清除ajax中之前的值 function doChange(obj){ var url = '<c:url value="/nutrition/getSubDictDataToJsonByCategory.action"/>'+"?rawfood.category="+obj;//第一个下拉框选中后进入的action,action中给第二个下拉框所需的值赋值 $.getJSON(url,function(json){ var seleOjb=document.getElementById("subSelect"); for(var k=0;k<seleOjb.options.length;k++){ seleOjb.options.remove(k); //当再选中第一个下拉框中的值时,把第二个下拉框中原来的值清除 } $.each(json.subCategoryDictList,function(index,subDictData){ var optionj=document.createElement("option"); //为第二个下拉框赋值 optionj.value = subDictData.id; //alert(subDictData.id); optionj.text=subDictData.name; seleOjb.add(optionj); }); }); } </script>

<action name="getSubDictDataToJsonByCategory" class="rawfoodAction" method="getSubDictDataToJsonByCategory"> <result name="success" type="json"> <param name="includeProperties"> //定义返回的参数 ^subCategoryDictList\[\d+\]\.id, ^subCategoryDictList\[\d+\]\.name </param> </result> </action>