extjs4 callback的使用方法

这个form 不配置store 但是可以通过callback 将数据传入当前的form表单。
1.先写一个store 然后定义fields 和model 作用是一样的，后台加载数据到store_1中去，
2. 将store 中的数据进行回召， store_1.getAt(0)根据索引得到数据 赋值给变量data，然后利用 me 就是this 前面定义过，this 指的就是上面的一个form表单。然后利用loadRecord()方法将data 放入这个form表单中。前台就可以看到数据了。

Ext.define("hyzc.hyxxck.view.hyxxckView",{
	extend:"Ext.form.Panel",
	alias:"widget.gnxh101",
	id:"gnxh101id",
	autoScroll:true,
	layout:'anchor',
    defaults:{
		xtype:'fieldset',
		layout:'hbox',
		collapsed:false,
		anchor:'98%',
		collapsible: true
    },
    buttonAlign:"center",
	items:[
		{
			title:'<font color="black">基本信息</font>',
			defaults:{
				xtype:'container',
				flex: 2,
				layout:'anchor',
				defaults:{
					xtype:'displayfield',
					labelAlign:"right",
					margin:'5 5 5 5',
					anchor:'98%',
					labelWidth:125
				}
			},
			items:[
		        {
		        	items:[
	        	        {name:'name',fieldLabel:'<font color="blue">姓&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp名</font>'},
	        	        {name:'organization',fieldLabel:'<font color="blue">单&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp位</font>'},
	        	        {name:'id_num',fieldLabel:'<font color="blue">最&nbsp高&nbsp学&nbsp历</font>'},
						{name:'positon',fieldLabel : '<font color="blue">开户行名称</font>'},
        	        ]
		        },
		        {
		        	items:[
						{name:'postcode',fieldLabel:'<font color="blue">邮&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp编</font>'},
						{name:'mobile_telephone',fieldLabel:'<font color="blue">移动&nbsp&nbsp电话</font>'},
						{name:'email',fieldLabel:'<font color="blue">电子&nbsp&nbsp邮箱</font>'},
						{name:'bank_exname',fieldLabel : '<font color="blue">开户人姓名</font>'},
						
						]
		        },
	        ]			
		},
    ],
    listeners:{
	       'beforerender':function(){
	    	var me = this;
	    	var store_1 = Ext.create('Ext.data.Store',{
	    		pageSize:50,
	    	    fields: [
	 					"name",
	 					"id_num",
	 					"organization",
	 					"position"
	 					
	 	    	    ],
	 	    		proxy:{
	 	    			type:"ajax",
	 	    			api:{
	 	    				read:"/LFZXXT/zc/pxhyzc/readHYData.action"
	 	    			},
	 	    			reader:{
	 	    				type:"json",
	 	    				root:"jsonarray",
	 	    				totalProperty:"total"
	 	    			}	
	 	    		},
	 	    		autoLoad:false
	 	    	});
	    	store_1.load({
    			callback:function(records,operation,success){
    				if(success){
    			    	var cnt = store_1.getCount();
    			    	if(!(cnt>0))
    			    		return null;
    					var data = store_1.getAt(0);
    					me.loadRecord(data);
    				}
				}
	    	});	  
	    }
	},
	dockedItems : [
	       		{
	    			xtype:'toolbar',
	    			name:'dispcon',
	    			layout: { type: 'hbox'},  
	    			items:[
	    				'->',
	    			    {	
	    			    	xtype:'label',
	    			    	html:'<font color=black size=5px><b>查看</b></font>'
	    			    },
	    			    '->'
	    			]
	    		},
	       	]
});