这个二级菜单不同于上次写的多级菜单的实现，此次目的关联两张表，上次的多级菜单是一张表，所以区别在此，实现起来也有所不同。
实现图如下：
这里是一级列表，对应的是组名（RescueUnit）
这里是二级展开列表，对应的是组名下的人员（Staff）
Action代码如下：
public String middle() {setNodestree(nodestree());return "middle";}public String nodestree() {JSONArray jsonArray = new JSONArray();List<RescueUnit> rescueUnitAllList = rescueUnitService.getAllRescueUnit();for (RescueUnit mg : rescueUnitAllList) {Map<Object, Object> jsonMapList = new HashMap<Object, Object>();jsonMapList.put("name", mg.getUnitname());jsonMapList.put("id", mg.getId());if (mg.getChildren() != null) {getChildrenArray(mg, jsonMapList);}jsonArray.add(jsonMapList);}return jsonArray.toString();}private void getChildrenArray(RescueUnit mg, Map<Object, Object> jsonMapList) {JSONArray childrenArray = new JSONArray();for (Staff children : mg.getChildren()) {Map<Object, Object> childrenMap = new HashMap<Object, Object>();childrenMap.put("name", children.getName());childrenMap.put("id", children.getId());jsonMapList.put("rescueUnit_id", children.getRescueUnit() == null ? "" : children.getRescueUnit().getId());childrenArray.add(childrenMap);}jsonMapList.put("children", childrenArray);}
这里是JS的代码：
<script src="/skin/nt/lib/layui/layui.js"></script><script><!--这里是树形菜单的js-->layui.use('tree', function(){layui.tree({elem: '#ele4' //指定元素,target: '_blank' //是否新选项卡打开（比如节点返回href才有效）,nodes:${(nodestree)!} })});</script>
<ul id="ele4"></ul> //采用这种方式调用树
上述action代码中，获取全部的list方法在Service以及dao层都有定义，定义如下：
service层：
public interface RescueUnitService extends BaseService<RescueUnit,String>{public List<RescueUnit> getAllRescueUnit();}
@Servicepublic class RescueUnitServiceImpl extends BaseServiceImpl<RescueUnit, String> implements RescueUnitService {@Resourceprivate RescueUnitDao rescueUnitDao;@Resourcepublic void setCatsiccodesDao(RescueUnitDao rescueUnitDao) {this.rescueUnitDao = rescueUnitDao;super.setBaseDao(rescueUnitDao);}public List<RescueUnit> getAllRescueUnit() {return rescueUnitDao.getAllRescueUnit();}}
dao层：
public interface RescueUnitDao extends BaseDao<RescueUnit,String>{public List<RescueUnit> getAllRescueUnit();}
@Repositorypublic class RescueUnitIDaoImpl extends BaseDaoImpl<RescueUnit, String> implements RescueUnitDao {public List<RescueUnit> getAllRescueUnit() {String hql = "from RescueUnit rescueUnit order by orderList ";return getSession().createQuery(hql).list();}}
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