EXTJS 5の学習記録のTreePanelツリーのローカルロードと非同期ロード

var store = Ext.create('Ext.data.TreeStore', {
		    root: {
		        expanded: false,//     
		        children: [   //            
		            { text: "    ", leaf: true,id:'firstNode',checked:false },
		            { text: "    1", expanded: true,checked:false, children: [
		                { text: "    ", leaf: true,checked:false },
		                { text: "    1", leaf: true,checked:false}
		            ] },
		            { text: "       ", leaf: false,checked:false } //leaf:false       
		        ]
		    }
		});

return Ext.create('Ext.tree.Panel', {    //        return                renderTo
		    title: 'Simple Tree',
		    id:'tree',
		    width: 500,
		    height: 350,
		    store: store,
		    autoEncode: true, //          
		    //selModel: new Ext.tree.MultiSelectionModel(), //           
		    rootVisible: false,
		    listeners:{
		    	beforeitemexpand:function(node,optd){  //        
		    		var tt=node.data.text;
		    		store.setProxy({   //             extjs        
                           type:'ajax',
                           url:'SyncTreeServlet' ,
                           extraParams:{time:tt}   //    
                     });
		    	}
		    },
			bbar: [{      //                
				text: "    ",    
				tooltip: "        ",    
				tooltipType: "qtip",    
				handler: function(){     
					var model = Ext.getCmp("tree").getSelectionModel();//           
					model.selectPrevious();    
				}   
			},{
				text: "    ",    
				tooltip: "        ",    
				tooltipType: "qtip",    
				handler: function(){     
					var model = Ext.getCmp("tree").getSelectionModel();//           
					model.selectNext();    
				} 
			},{
				text: "   ",    
				tooltip: "        ",    
				tooltipType: "qtip",    
				handler: function(){     
					var model = Ext.getCmp("tree").getSelectionModel();//           
					var selectedNode = model.getSelection();//           
					console.info(selectedNode);
					if(selectedNode&&selectedNode.length>0){      
						Ext.MessageBox.alert("hint", selectedNode[0].data.text); 
					}     
				} 
			}],
			tbar:[{
				text: "    ",    
				tooltip: "     ",    
				tooltipType: "qtip",    
				handler: function(){  
					Ext.MessageBox.prompt("  ", "         ：", function(btn, txt){   
						if(btn == "ok"){    
							var tree = Ext.getCmp("tree");
							var newNode = new Ext.tree.Panel({text: txt,leaf: true});    
							var selNode = tree.getSelectionModel().getSelection();    
							if(selNode&&selNode.length>0){     
								//Ext.Msg.alert("  ", "                ！"); 
								selNode[0].appendChild(newNode);
								tree.getSelectionModel().clearSelections(); //                                        
							}else{  
								tree.getRootNode().appendChild(newNode);
								tree.getSelectionModel().clearSelections(); //        
							}  
						}  
					});
				}
			},{
				text: "    ",    
				tooltip: "        ",    
				tooltipType: "qtip",    
				handler: function(){     
					var tree = Ext.getCmp("tree");
					var selNode = tree.getSelectionModel().getSelection();    
					if(!selNode||selNode.length<1){     
						Ext.Msg.alert("  ", "       ！"); 
					}else{  
						selNode[0].remove();
						tree.getSelectionModel().clearSelections(); //        
					}  
				}
			},{
				text: "    ",    
				tooltip: "        ",    
				tooltipType: "qtip",    
				handler: function(){     
					var tree = Ext.getCmp("tree");
					var selNode = tree.getSelectionModel().getSelection();    
					if(!selNode||selNode.length<1){     
						Ext.Msg.alert("  ", "       ！"); 
					}else{  
						Ext.MessageBox.prompt("  ", "         ：", function(btn, txt){ 
							if(btn=="ok"){
								selNode[0].set("text",txt);
								selNode.updateInfo(true);
								Ext.Msg.alert("hint","    ！");
								tree.getSelectionModel().clearSelections(); //        
							}
						
						});
					}  
				}
			}],
		    renderTo: Ext.getBody()
		});

public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		response.setCharacterEncoding("utf-8");
		Writer out = response.getWriter();
		StringBuffer sb = new StringBuffer("[");
		for (int i = 0; i < 4; i++) {
			int id = (int) (Math.random()*100000);
			//System.out.println("id:=================>"+id);
			sb.append("{id:"+id+",text:'    "+i+"',leaf: false,checked:false},");
		}
		sb.append("]");
		out.write(sb.toString());
	}