ExtJs cookie 操作存在bug

Ext 的cookie操作十分简单，

 

具体的实现代码如下

 

 

//var cp = new Ext.state.CookieProvider();
//Ext.state.Manager.setProvider(cp);

插入cookie // cp.set("username",username);

获取cookie值  //var defaultvalue=cp.get("username");

 

/*!
 * Ext JS Library 3.2.1
 * Copyright(c) 2006-2010 Ext JS, Inc.
 * [e-mail]
 * http://www.extjs.com/license
 */
Ext.onReady(function(){

    Ext.QuickTips.init();

    // turn on validation errors beside the field globally
    Ext.form.Field.prototype.msgTarget = 'side';


	var cp = new Ext.state.CookieProvider();      
	Ext.state.Manager.setProvider(cp);
	var defaultvalue=cp.get("username"); 
	

	
    var simple = new Ext.FormPanel({
        labelWidth: 75, // label settings here cascade unless overridden
        frame:true,
        title: 'hello',
        bodyStyle:'padding:5px 5px 0',
        width: 350,
        buttonAlign:"center",
        defaults: {width: 230},
        defaultType: 'textfield',

        items: [{
                fieldLabel: '用户名',
                name: 'username',
                allowBlank:false,
				emptyText:''
            },{
                fieldLabel: '密码',
                name: 'password',
                inputType: 'password'
            },new Ext.form.Label({
            	id:"label_notice",
            	text:"notice：please insert your name",
            	style:"text-decoration:underline;text-align:center;text-shadow:#FF0;color:red;"
            })
        ],

        buttons: [{
            text: '登录',
            handler: function(){
				
			cp.set("username",username);	
				
            	if(simple.getForm().isValid()){
            		var username = simple.getForm().findField("username").getValue();
            		var password = simple.getForm().findField("password").getValue();if(username==""||password==""){Ext.Msg.alert("错误","用户名密码不能为空")}});
            	} return；
            }
        },{
            text: '重置 ',
            handler: function(){
            	if(simple.getForm().isValid()){
            		var form = simple.getForm().getEl().dom;
            		form.reset();
            	}
            }
        },{
        	text: '帮助',
        	handler : function(){
        		help();
        	}
        }]
    });
    
    var window = new Ext.Window({
    	title: '',
    	width: 400,
    	height:180,
    	layout: 'fit',
    	plain:true,
    	bodyStyle:'padding:5px;',
    	closable:false,
    	items: simple
    });

    //simple.render(document.body);
    window.show();

});

 

 

虽然这样非常容易实现十分简单的cookie操作，但是，refeash 之后， 会自动取到 cookie中username 的值，但是自动检测为空则会报错，郁闷中，估计要阅读源码才会解决。