Extjs 只显示年月的控件

/*!
* Copyright(c) 2009 Costin Bereveanu, KEYPOINT SOLUTIONS
* costin@keypoint.ro
* http://www.keypoint.ro/ext/extensions/license.txt */
Ext.ux.MonthPickerPlugin = function() {
var picker;
var oldDateDefaults;

this.init = function(pk) {
picker = pk;
picker.onTriggerClick = picker.onTriggerClick.createSequence(onClick);
picker.getValue = picker.getValue.createInterceptor(setDefaultMonthDay).createSequence(restoreDefaultMonthDay);
picker.beforeBlur = picker.beforeBlur.createInterceptor(setDefaultMonthDay).createSequence(restoreDefaultMonthDay);
};

function setDefaultMonthDay() {
oldDateDefaults = Date.defaults.d;
Date.defaults.d = 1;
return true;
}

function restoreDefaultMonthDay(ret) {
Date.defaults.d = oldDateDefaults;
return ret;
}

function onClick(e, el, opt) {
var p = picker.menu.picker;
p.activeDate = p.activeDate.getFirstDateOfMonth();
if (p.value) {
p.value = p.value.getFirstDateOfMonth();
}

p.showMonthPicker();

if (!p.disabled) {
p.monthPicker.stopFx();
p.monthPicker.show();

p.mun(p.monthPicker, 'click', p.onMonthClick, p);
p.mun(p.monthPicker, 'dblclick', p.onMonthDblClick, p);
p.onMonthClick = p.onMonthClick.createSequence(pickerClick);
p.onMonthDblClick = p.onMonthDblClick.createSequence(pickerDblclick);
p.mon(p.monthPicker, 'click', p.onMonthClick, p);
p.mon(p.monthPicker, 'dblclick', p.onMonthDblClick, p);
}
}

function pickerClick(e, t) {
var el = new Ext.Element(t);
if (el.is('button.x-date-mp-cancel')) {
picker.menu.hide();
} else if(el.is('button.x-date-mp-ok')) {
var p = picker.menu.picker;
p.setValue(p.activeDate);
p.fireEvent('select', p, p.value);
}
}

function pickerDblclick(e, t) {
var el = new Ext.Element(t);
if (el.parent()
&& (el.parent().is('td.x-date-mp-month')
|| el.parent().is('td.x-date-mp-year'))) {

var p = picker.menu.picker;
p.setValue(p.activeDate);
p.fireEvent('select', p, p.value);
}
}
};
Ext.preg('monthPickerPlugin', Ext.ux.MonthPickerPlugin);