easyui的下拉框動態級聯加載的實現方法（附代碼）

<span>學院名稱：</span> 
<input class="easyui-combobox" style="width:30%;" id="collegeName"> 
<span>課程名稱：</span> 
<input class="easyui-combobox" style="width:30%;" id="courseName"><br/>

$(function() { 
 // 下拉框選擇控件，下拉框的內容是動態查詢數據庫信息 
 $('#collegeName').combobox({ 
 url:'${pageContext.request.contextPath}/loadInstitution', 
 editable:false, //不可編輯狀態 
 cache: false, 
 panelHeight: '150', 
 valueField:'id', 
 textField:'institutionName', 
 onHidePanel: function(){ 
 $("#courseName").combobox("setValue",'');//清空課程 
 var id = $('#collegeName').combobox('getValue'); 
 //alert(id); 
 $.ajax({ 
 type: "POST", 
 url: '${pageContext.request.contextPath}/loadCourse?id=' + id, 
 cache: false, 
 dataType : "json", 
 success: function(data){ 
 $("#courseName").combobox("loadData",data); 
 } 
 }); 
 } 
}); 
 $('#courseName').combobox({ 
 //url:'itemManage!categorytbl', 
 editable:false, //不可編輯狀態 
 cache: false, 
 panelHeight: '150',//自動高度適合 
 valueField:'id', 
 textField:'courseName' 
 }); 
});

@RequestMapping("/loadInstitution") 
 /** 
 * 加載學院 
 * @param 
 * @param 
 * @return void 
 * @exception/throws [違例類型] [違例說明] 
 * @see [類、類#方法、類#成員] 
 * @deprecated 
 */ 
 public void loadInstitute(HttpServletRequest request, 
 HttpServletResponse response) throws Exception { 
 try { 
 JackJsonUtils JackJsonUtils = new JackJsonUtils(); 
 List<Institution> institutionList = institutionBean 
 .queryAllColleage(); 
 System.out.println("學院list大小=====" + institutionList.size()); 
 String result = JackJsonUtils.BeanToJson(institutionList); 
 System.out.println(result); 
 JsonUtils.outJson(response, result); 
 } catch (Exception e) { 
 logger.error("加載學院失敗", e); 
 } 
 } 
 
 @RequestMapping("/loadCourse") 
 /** 
 * 動態加載課程 
 * 
 * 
 * @param 
 * @param 
 * @return void 
 * @exception/throws [違例類型] [違例說明] 
 * @see [類、類#方法、類#成員] 
 * @deprecated 
 */ 
 public void loadCourse(HttpServletRequest request, 
 HttpServletResponse response) throws Exception { 
 JackJsonUtils JackJsonUtils = new JackJsonUtils(); 
 String id = request.getParameter("id"); 
 System.out.println("學院id====" + id); 
 try { 
 if(id != null && id != ""){ 
 List<CourseInfo> listCourseInfoList = courseBean 
 .queryAllCourseInfos(id); 
 System.out.println("課程list大小=====" + listCourseInfoList.size()); 
 String result = JackJsonUtils.BeanToJson(listCourseInfoList); 
 System.out.println(result); 
 JsonUtils.outJson(response, result); 
 } 
 } catch (Exception e) { 
 logger.error("加載課程失敗", e); 
 } 
 }