extjs 时间范围选择自动判断的实现代码

Ext.apply(Ext.form.field.VTypes, { 
daterange: function (val, field) { 
var date = field.parseDate(val); 

if (!date) { 
return false; 
} 
if (field.startDateField && (!this.dateRangeMax || (date.getTime() != this.dateRangeMax.getTime()))) { 
var start = field.up('grid').down('#' + field.startDateField); 
start.setMaxValue(date); 
start.validate(); 
this.dateRangeMax = date; 
} 
else if (field.endDateField && (!this.dateRangeMin || (date.getTime() != this.dateRangeMin.getTime()))) { 
var end = field.up('grid').down('#' + field.endDateField); 
end.setMinValue(date); 
end.validate(); 
this.dateRangeMin = date; 
} 
return true; 
}, 
daterangeText: '开始日期必须小于结束日期' 
}); 
Ext.tip.QuickTipManager.init();

{ 
xtype: 'datefield', 
fieldLabel: '时间范围 开始', 
name: 'startdt', 
id: 'startdt', 
vtype: 'daterange', 
endDateField: 'enddt', 
format: 'Y-m-d', 
width: 220, 
labelWidth: 90, 
msgTarget: 'side', 
autoFitErrors: false 
}, { 
xtype: 'datefield', 
fieldLabel: '结束', 
name: 'enddt', 
id: 'enddt', 
vtype: 'daterange', 
startDateField: 'startdt', 
format: 'Y-m-d', 
width: 170, 
labelWidth: 40, 
msgTarget: 'side', 
autoFitErrors: false 
}, { xtype: 'button', 
text: '查询', 
iconCls: 'fljs', 
handler: function () { ...