Easyui 异步树的实现

网上最多的onBeforeExpand 可用，因为后台代码没写对导致树形结构重复加载数据

前端代码：

 <%@ page language="java" contentType="text/html; charset=UTF-8"
     pageEncoding="UTF-8"%>
     <div>
         <table cellpadding="5">
             <tr>
                 <td height="300px"><ul id="diseaseNameTree" class="easyui-tree"></ul>
                 </td>
             </tr>
         </table>
     </div>
 <script>
     $('#diseaseNameTree').tree({
         url : getServer_context() + '/api/patient/getDiseaseNameTree?Id=',
         onBeforeExpand : function(node, param) {
             console.log('ID=' + node.id);
             console.log('length=' + node.id.length);
             $('#diseaseNameTree').tree('options').url = getServer_context() + '/api/patient/getDiseaseNameTree?Id=' + node.id;
         }
     })

     function searchICD10ByPinyin() {
         var pinyin = $('#ICD10Pinyin').val();
         console.log(pinyin);
         if (pinyin == null || pinyin == "") {
             $('#diseaseNameTree').tree('reload');
         } else {
             console.log('000');
             $('#diseaseNameTree').tree({
                 url: getServer_context() + '/api/patient/getDiseaseNameByPinyin?Pinyin=' + pinyin
             });
         }

     }
 </script>

后台代码：

     public JSONArray getDiseaseNameTreeData(String Id) throws RecordNotFoundException {
         JSONArray jsonArray = new JSONArray();
         JSONArray childrenArray = new JSONArray();
         JSONArray grandChildrenArray = new JSONArray();
         JSONObject parentObject = new JSONObject();
         JSONObject childrenObject = new JSONObject();
         JSONObject grandChildrenObject = new JSONObject();

         if(Id == null || "".equals(Id)) {
             Iterable<SsIcd10> parentList = ssICD10Dao.getDiseaseNameParent();
             for(SsIcd10 parent : parentList) {
                 parentObject.clear();
                 parentObject.put("id", parent.getFicd10());
                 parentObject.put("text", parent.getFdesc());
                 parentObject.put("state", "closed");
                 jsonArray.add(parentObject);
             }
             return jsonArray;
         } else if (Id.length() == 3){
             Iterable<SsIcd10> childrenList = ssICD10Dao.gettDiseaseNameChildren(Id);
             for(SsIcd10 child : childrenList) {
                 childrenObject.clear();
                 childrenObject.put("id", child.getFicd10());
                 childrenObject.put("text", child.getFdesc());
                 childrenObject.put("state", ssICD10Dao.hasGrandChildren(child.getFicd10()) > 0 ? "closed" : "open");
                 childrenArray.add(childrenObject);
             }
             return childrenArray;
         } else {
             Iterable<SsIcd10> grandChildrenList = ssICD10Dao.gettDiseaseNameGrandChildren(Id);
             for(SsIcd10 grandChild : grandChildrenList) {
                 grandChildrenObject.clear();
                 grandChildrenObject.put("id", grandChild.getFicd10());
                 grandChildrenObject.put("text", grandChild.getFdesc());
                 grandChildrenArray.add(grandChildrenObject);
             }
             return grandChildrenArray;
         }

逻辑写的很傻，还没想出来怎么写更好的

     public JSONArray getDiseaseNameTreeByPinyin(String Pinyin) throws RecordNotFoundException {
         JSONArray jsonArray = new JSONArray();
         JSONArray childrenArray = new JSONArray();
         JSONArray grandChildrenArray = new JSONArray();
         JSONObject parentObject = new JSONObject();
         JSONObject childrenObject = new JSONObject();
         JSONObject grandChildrenObject = new JSONObject();
         Iterable<SsIcd10> list = ssICD10Dao.getDiseaseNameDataByPinyin(Pinyin);
         for(SsIcd10 ssIcd10 : list) {
             if(ssIcd10.getFicd10().length() == 3) {
                 parentObject.clear();
                 parentObject.put("id", ssIcd10.getFicd10());
                 parentObject.put("text", ssIcd10.getFdesc());
                 Iterable<SsIcd10> children =  ssICD10Dao.getDiseaseNameChildrenByPinyin(ssIcd10.getFicd10(), Pinyin);
                 if(children != null) {
                     childrenArray.clear();
                     for(SsIcd10 child : children) {
                         childrenObject.clear();
                         childrenObject.put("id", child.getFicd10());
                         childrenObject.put("text", child.getFdesc());
                         Iterable<SsIcd10> grandChildren = ssICD10Dao.getDiseaseNameGrandChildrenByPinyin(child.getFicd10(), Pinyin);
                         if(grandChildren != null) {
                             grandChildrenArray.clear();
                             for(SsIcd10 grandChild : grandChildren) {
                                 grandChildrenObject.clear();
                                 grandChildrenObject.put("id", grandChild.getFicd10());
                                 grandChildrenObject.put("text", grandChild.getFdesc());
                                 grandChildrenArray.add(grandChildrenObject);
                             }
                             childrenObject.put("children", grandChildrenArray);
                         }
                         childrenArray.add(childrenObject);
                     }
                     parentObject.put("children", childrenArray);
                 }
                 jsonArray.add(parentObject);
             } else if (ssIcd10.getFicd10().length() > 3 && ssIcd10.getFicd10().length() <= 6) {
                 if(ssICD10Dao.hasParent(ssIcd10.getFicd10().substring(0, 3), Pinyin) == 0) {
                     parentObject.clear();
                     parentObject.put("id", ssIcd10.getFicd10());
                     parentObject.put("text", ssIcd10.getFdesc());
                     Iterable<SsIcd10> grandChildren = ssICD10Dao.getDiseaseNameGrandChildrenByPinyin(ssIcd10.getFicd10(), Pinyin);
                     if(grandChildren != null) {
                         grandChildrenArray.clear();
                         for(SsIcd10 grandChild : grandChildren) {
                             grandChildrenObject.clear();
                             grandChildrenObject.put("id", grandChild.getFicd10());
                             grandChildrenObject.put("text", grandChild.getFdesc());
                             grandChildrenArray.add(grandChildrenObject);
                         }
                         parentObject.put("children", grandChildrenArray);
                     }
                     jsonArray.add(parentObject);
                 }
             } else {
                 if(ssICD10Dao.hasParent(ssIcd10.getFicd10().substring(0, 3), Pinyin) == 0
                         && ssICD10Dao.hasChildren(ssIcd10.getFicd10().substring(0, 6), Pinyin) == 0) {
                     parentObject.clear();
                     parentObject.put("id", ssIcd10.getFicd10());
                     parentObject.put("text", ssIcd10.getFdesc());
                     jsonArray.add(parentObject);
                 }
             }
         }
         return jsonArray;

     }