Easyui的简单tree

关于easyui的tree

所有树数据都保存在同一张表中，实现无线下级的tree

tree的实体类

import java.io.Serializable;/** * 类别信息 * */public class PRoject_Type implements Serializable {		/**	 * 类别ID	 */	private int type_id;		/** 类别编号 **/	private String type_no;	/** 类别名称 **/	private String type_name;	/** 父类ID **/	private int parent_id;	/** 是否末级 **/	private boolean type_end;	/** 类别描述 **/	private String type_describe;		public Project_Type() {		super();	}		public Project_Type(int type_id, String type_no, String type_name,			int parent_id, boolean type_end,			String type_describe) {		super();		this.type_id = type_id;		this.type_no = type_no;		this.type_name = type_name;		this.parent_id = parent_id;		this.type_end = type_end;		this.type_describe = type_describe;	}	public int getType_id() {		return type_id;	}	public void setType_id(int type_id) {		this.type_id = type_id;	}	public String getType_no() {		return type_no;	}	public void setType_no(String type_no) {		this.type_no = type_no;	}	public String getType_name() {		return type_name;	}	public void setType_name(String type_name) {		this.type_name = type_name;	}	public int getParent_id() {		return parent_id;	}	public void setParent_id(int parent_id) {		this.parent_id = parent_id;	}	public boolean getType_end() {		return type_end;	}	public void setType_end(boolean type_end) {		this.type_end = type_end;	}	public String getType_describe() {		return type_describe;	}	public void setType_describe(String type_describe) {		this.type_describe = type_describe;	}	}
新增子树数据的代码
	public Project_Type getTypeNoById(int pid) {		Project_Type pttype=new Project_Type();		String hql=" from Project_Type as t where t.parent_id=? order by t.type_id desc";		List<Project_Type> pt = null;		try {			pt = baseDao.find(hql, new Integer[]{pid}, 1, 1);		} catch (Exception e) {            		System.err.println(e.toString());           		System.err.println("--------------------");            		System.err.println(e.getMessage());           		System.err.println("--------------------");            		e.printStackTrace();			return null;		}						if(pt==null || pt.size()==0){			pttype=baseDao.get(Project_Type.class, pid);//不存在，就加载父类。获取父类的NO+01			pttype.setType_no(pttype.getType_no()+"01");		}else{			pttype=pt.get(0);			int nummber=Integer.parseInt(pttype.getType_no())+1;//强制转父类下最大的type_no 并加1 就为新的			pttype.setType_no(nummber+"");		}				return pttype;	}查询tree的时候封装成框架需要的代码
	public List<TreeNode> getAllTreeNode(Integer type_id,Integer id) {		List<Project_Type> list=new ArrayList<Project_Type>();		System.out.println("当前类别:" + type_id + ",父类Id:" + id);				try {			if(type_id == null && id == null){				list=baseDao.find(" from Project_Type where parent_id=0");			}else{				if(id == null){					list=baseDao.find(" from Project_Type where parent_id= 0 and type_id = "+type_id);				}else{					list=baseDao.find(" from Project_Type where parent_id= " + id);				}			}					} catch (Exception e) {            		System.err.println(e.toString());            		System.err.println("--------------------");            		System.err.println(e.getMessage());            		System.err.println("--------------------");            		e.printStackTrace();			return null;		}				List<TreeNode>nodes=new ArrayList<TreeNode>();		for (Project_Type p : list) {			TreeNode t=new TreeNode();			HashMap<String,String>map=new HashMap<String, String>();			t.setChecked(false);			if(p.getType_end()){				map.put("isend", "YES");				t.setState("open");			}else{				t.setState("closed");				map.put("isend", "NO");							}			t.setText(/*"["+p.getType_no()+"]"+*/p.getType_name());			t.setId(p.getType_id()+"");			t.setAttributes(map);			t.setIconCls("icon-blank");	//设置tree的图标为空白			t.setT(p);			nodes.add(t);		}		return nodes;	}前台代码首先导入easyui的js和CSS等
其次tree的代码
<ul id="mytree" ></ul>$(function(){		//树形菜单加载	$('#mytree').tree({	    url:'loadTree.action',	    toolbar:'#toolbar',	    dnd:false,//是否允许拖拽	    onSelect : function(node) {	    	if(node.attributes.isend=='NO'){	    		url:'loadTree.action'	    		 //alert('数据刷新中')	    	}else{	    		//alert('数据不能刷新/不能新增子类')	    	}		},		onDblClick: function(node){			update();		},		onContextMenu: function(e, node){			e.preventDefault();			// 查找节点			$('#mytree').tree('select', node.target);			// 显示快捷菜单			$('#mm').menu('show', {				left: e.pageX,				top: e.pageY			});		},		onBeforeDrag:function(node){	//在开始拖动节点之前触发，返回false可以拒绝拖动		}	});});easyui的帮助文档：http://download.csdn.net/download/love_xiolan/9628767