extjs Ext.tree.TreeEditor 节点编辑状态前后

//这里面添加代码 
treeEditer = new Ext.tree.TreeEditor(  
										 tree,  
										 {allowBlank: false} 
									  );  
									  treeEditer.on("beforestartedit", function(treeEditer){  
										 var tempNode = treeEditer.editNode;//将要编辑的节点  
										 if(tempNode.isLeaf()){  
											return true;  
										 }else{  
											return false;     
										 }  
									   });  
								  
									   treeEditer.on("complete", function(treeEditer){  
										   alert(treeEditer.editNode.text);  
									   });