关于treegrid的动态加载

1、前端

<%@ page language="java" pageEncoding="UTF-8" contentType="text/html; charset=UTF-8"%>
<script type="text/javascript">
	$(function() {
		$('#goods_type_treegrid').treegrid({
			url : '${pageContext.request.contextPath}/admin/goodsTypeController/treegrid.do?id=NULL',
			idField : 'id',
			treeField : 'text',
			rownumbers: true,
			parentField : 'pid',
			fit : true,
			fitColumns : true,
			border : false,
			frozenColumns : [ [ {
				title : '编号',
				field : 'id',
				width : 150,
				hidden : true
			}, {
				field : 'text',
				title : '类别名称',
				width : 200
			} ] ],
			columns : [ [  {
				field : 'pname',
				title : '上级类别名称',
				width : 80
			},{
				field : 'seq',
				title : '排序',
				width : 50
			},{
				field : 'code',
				title : '类别编码',
				width : 50
			}, {
				field : 'pid',
				title : '上级类别ID',
				width : 150,
				hidden : true
			}, {
				field : 'action',
				title : '动作',
				width : 50,
				formatter : function(value, row, index) {
					return formatString('<img onclick="goods_type_editFun(\'{0}\');" src="{1}"/>&nbsp;<img onclick="goods_type_deleteFun(\'{2}\');" src="{3}"/>', row.id, '${pageContext.request.contextPath}/style/images/extjs_icons/pencil.png', row.id, '${pageContext.request.contextPath}/style/images/extjs_icons/cancel.png');
				}
			} ] ],
			toolbar : [ 
			{
				text : '批量导入',
				iconCls : 'icon-remove',
				handler : function() {
					goods_type_importFun();
				}
			},{
				text : '增加',
				iconCls : 'icon-add',
				handler : function() {
					goods_type_appendFun();
				}
			}, '-', {
				text : '展开',
				iconCls : 'icon-redo',
				handler : function() {
					var node = $('#goods_type_treegrid').treegrid('getSelected');
					if (node) {
						$('#goods_type_treegrid').treegrid('expandAll', node.cid);
					} else {
						$('#goods_type_treegrid').treegrid('expandAll');
					}
				}
			}, '-', {
				text : '折叠',
				iconCls : 'icon-undo',
				handler : function() {
					var node = $('#goods_type_treegrid').treegrid('getSelected');
					if (node) {
						$('#goods_type_treegrid').treegrid('collapseAll', node.cid);
					} else {
						$('#goods_type_treegrid').treegrid('collapseAll');
					}
				}
			}, '-', {
				text : '刷新',
				iconCls : 'icon-reload',
				handler : function() {
					$('#goods_type_treegrid').treegrid('reload');
				}
			} ],
			onBeforeExpand:function(row){
				//动态设置展开查询的url  
		        var url = '${pageContext.request.contextPath}/admin/goodsTypeController/treegrid.do'; 
		        $("#goods_type_treegrid").treegrid("options").url = url;  
		        return true;      
			},
			onContextMenu : function(e, row) {
				e.preventDefault();
				$(this).treegrid('unselectAll');
				$(this).treegrid('select', row.id);
				$('#goods_type_menu').menu('show', {
					left : e.pageX,
					top : e.pageY
				});
			},
 onExpand : function(row){
 var children = $("#goods_type_treegrid").treegrid('getChildren',row.id);
 if(children.length<=0){
 row.leaf=true;
 $("#goods_type_treegrid").treegrid('refresh', row.id);
 }
 }

		});
	});
</script>
<table id="goods_type_treegrid"></table>

2、controller

@RequestMapping("/treegrid")
	@ResponseBody
	public List<GoodsTypePage> treegrid(GoodsTypePage goodsTypePage) {
		if(null==goodsTypePage || "".equals(goodsTypePage.getId()) || null == goodsTypePage.getId()){
			goodsTypePage.setId("NULL");
		}
		return goodsTypeService.treegrid(goodsTypePage);
	}

3、service

@Override
	// 缓存数据
	public List<GoodsTypePage> treegrid(GoodsTypePage goodsTypePage) {
		String hql = "";
		if(null==goodsTypePage || "".equals(goodsTypePage.getId()) || "NULL".equals(goodsTypePage.getId())){
			hql = "from GoodsType t where t.tgoodstype.id is NULL order by t.seq";
		}else{
			hql = "from GoodsType t where t.tgoodstype.id = '" +goodsTypePage.getId()+"' order by t.seq";
		}
		List<GoodsType> brList = goodsTypeDao.find(hql);
		List<GoodsTypePage> nl = new ArrayList<GoodsTypePage>();
		if (brList != null && brList.size() > 0) {
			for (GoodsType br : brList) {
				GoodsTypePage r = new GoodsTypePage();
				BeanUtils.copyProperties(br, r);
				if(br.getTgoodstype()!=null){
					r.setPname(br.getTgoodstype().getText());
					r.setPid(br.getTgoodstype().getId());
				}
				r.setState("closed");
				nl.add(r);
			}
		}
		return nl;
	}