继承Ext.form.DateField只选择年月

dateFieldMonthPickerShow = Ext.extend(Ext.form.DateField,{
initComponent : function(){
dateFieldMonthPickerShow.superclass.initComponent.call(this);
},
onTriggerClick : function(){
if(this.disabled){
return;
}
if(this.menu == null){
this.menu = new Ext.menu.DateMenu({
hideOnClick: false,
focusOnSelect: false
});
}
this.onFocus();
Ext.apply(this.menu.picker,  {
minDate : this.minValue,
maxDate : this.maxValue,
disabledDatesRE : this.disabledDatesRE,
disabledDatesText : this.disabledDatesText,
disabledDays : this.disabledDays,
disabledDaysText : this.disabledDaysText,
format : this.format,
showToday : this.showToday,
startDay: this.startDay,
minText : String.format(this.minText, this.formatDate(this.minValue)),
maxText : String.format(this.maxText, this.formatDate(this.maxValue))
});
this.menu.picker.setValue(this.getValue() || new Date());
this.menu.show(this.el, "tl-bl?");
this.menuEvents('on');
this.showMonthPickerMethod();
}
,
showMonthPickerMethod : function(){
this.menu.picker.showMonthPicker();
this.menu.picker.mon(this.menu.picker.monthPicker, 'click', function(e, t){
e.stopEvent();
var el = new Ext.Element(t), pn;
if(el.is('button.x-date-mp-cancel')){
this.menu.picker.hideMonthPicker();
this.menu.hide();
//							this.menu.picker.setValue(false);
//							this.hide();
}
else if(el.is('button.x-date-mp-ok')){
var d = new Date(this.menu.picker.mpSelYear, this.menu.picker.mpSelMonth, (this.menu.picker.activeDate || this.menu.picker.value).getDate());
if(d.getMonth() != this.menu.picker.mpSelMonth){
d = new Date(this.menu.picker.mpSelYear, this.menu.picker.mpSelMonth, 1).getLastDateOfMonth();
}
this.menu.picker.update(d);
this.menu.picker.hideMonthPicker();
this.menu.picker.setValue(d);
this.menu.picker.fireEvent('select', this.menu.picker, this.menu.picker.value);
}
}, this);
this.menu.picker.mon(this.menu.picker.monthPicker, 'dblclick', function(e, t){
e.stopEvent();
var el = new Ext.Element(t), pn;
if((pn = el.up('td.x-date-mp-month', 2))){
var d = new Date(this.menu.picker.mpSelYear, pn.dom.xmonth, (this.menu.picker.activeDate || this.menu.picker.value).getDate());
this.menu.picker.update(d);
this.menu.picker.hideMonthPicker();
this.menu.picker.setValue(d);
this.menu.picker.fireEvent('select', this.menu.picker, this.menu.picker.value);
}
else if((pn = el.up('td.x-date-mp-year', 2))){
var d = new Date(pn.dom.xyear, this.menu.picker.mpSelMonth, (this.menu.picker.activeDate || this.menu.picker.value).getDate());
this.menu.picker.update(d);
this.menu.picker.hideMonthPicker();
this.menu.picker.setValue(d);
this.menu.picker.fireEvent('select', this.menu.picker, this.menu.picker.value);
}
}, this);
}
});

new dateFieldMonthPickerShow({
format: 'Y-m'
....
});